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Journal articles on the topic 'Aluminium powder'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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1

Liu, He Ping, Feng Er Sun, Shao Lei Cheng, Lang Lang Liu, and Yi Bo Gao. "Microstructure Analysis and Preparation of Graphene Reinforced Aluminum Matrix Composites." Key Engineering Materials 814 (July 2019): 102–6. http://dx.doi.org/10.4028/www.scientific.net/kem.814.102.

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Although many problems in aluminium matrix composites have been solved, there are still many difficulties and challenges that need to be solved. In this work, graphene reinforced aluminum matrix composites are prepared by hot isostatic pressing and vacuum sintering. The microstructures of composite powders and composites were studied by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The effects of different ball milling parameters on the microstructures of composite powders were analyzed. The particle size of graphene coated aluminium composite powder increases with the increase of ball-to-material ratio. With the increase of milling time, graphene was gradually dispersed and coated on the aluminium powder particles, and the aluminium powder particles could be completely coated. with the increase of the speed, the large particles are extruded, sheared and the particles become smaller. The internal micro-deformation characteristics of graphene reinforced aluminium matrix composites were analyzed in detail.
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2

Champion, Y. "Powder metallurgy of nanometric aluminium powders." Powder Metallurgy 51, no. 2 (June 2008): 125–32. http://dx.doi.org/10.1179/174329008x284912.

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3

Cook, R., I. T. H. Chang, and C. Lucien Falticeanu. "Aluminium and Aluminium Alloy Powders for P/M Applications." Materials Science Forum 534-536 (January 2007): 773–76. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.773.

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P/M aluminium components are attracting interest in an increasing variety of industries due to the possibilities for weight saving in engineering parts. There are many processes for manufacturing from powder feedstocks that are either in production, becoming commercialised or still undergoing development. The nature of these processes and the required properties of the end products mean that powders of different particle size, shape, composition and microstructure must be produced. The requirements of various processes requiring aluminium and aluminium alloy powders for metal matrix composites, laser sintering, powder forging and metal injection moulding are discussed in relation to powder particle size and structure. The key requirement of the powder manufacturer is to supply cost effective materials for these different processes. This may require compromises to be made by the supplier and consumer while the techniques evolve from development to large scale production.
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4

Shen, Yang, Yu Zhong Ruan, Yan Yu, and Yun Hong Zheng. "Synthesis of Aluminium Titanate Ceramics from Waste Sludge of Aluminium Factory." Key Engineering Materials 368-372 (February 2008): 1538–40. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.1538.

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Aluminium titanate was synthesized using waste aluminium sludge and chemical pure TiO2 powder as raw materials. Effect of different compositions on crystal structure and contents of target product was discussed. XRD results showed that four crystal phases, aluminium titanate, perovskite, rutile and aluminum oxide, are formed in the sintered samples. The content of aluminium titanate increases first and then decreases with the decrease of the content of waste aluminum sludge. When the content of the sludge is 65.52wt%, the content of aluminium titanate reaches the maximum of 86.1wt%.
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5

Oliveira, J. L. A., and J. B. Fogagnolo. "Effects of Al2O3 Particles Addition on Compressibility and Sinterability of Aluminium Powder Allows." Materials Science Forum 591-593 (August 2008): 907–12. http://dx.doi.org/10.4028/www.scientific.net/msf.591-593.907.

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There is considerable industrial potential for aluminium alloys and aluminium metal matrix composites fabricated via net shape press-and-sintering powder metallurgy using low-cost, elemental premixed powder. In this work, the compressibility and sinterability of premixed Al– 4.5Cu–0.7Si–0.5Mg powder alloy reinforced with Al2O3 particles was analyzed. The powders reinforced with increasing ceramic particle content were cold-pressed under increasing pressure and sintered at 600 oC for 40 minutes, in nitrogen atmosphere. The powders showed the typical compressibility curves and the presence of hard ceramic particles decreased the powder deformation capacity and, consequently, the powder compressibility. The sintering produced swelling of the parts, due to the poor wettability of liquid phase on the aluminium particles and to the Kirkendall effect caused by the difference in diffusivity of aluminium in copper and copper in aluminium. The presence of Al2O3 particles increased the swelling during sintering probably due to the sooner formation of liquid phase.
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6

Labisz, Krzysztof, and Tomasz Tański. "Laser Surface Treatment of Cast Aluminium-Silicon Alloys." Solid State Phenomena 275 (June 2018): 30–40. http://dx.doi.org/10.4028/www.scientific.net/ssp.275.30.

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The reason of performing the investigations carried out in this work was to investigate the microstructure of the laser treated Al-Si-Cu cast aluminium alloy with the ceramic powder particles using High Power Diode Laser (HPDL) for remelting, and/or alloying. First of all the feeding and distribution of the powder in the surface layer of the alloyed and remelted AlSi7Cu material. Very important issue is the determination of the laser treatment parameters, especially the powder feeding rate, laser power, and scan rate to achieve an enhancement of the layer hardness for ensuring this cast aluminium alloy from losing their working properties and to achieve the tool surface is more resistant to wear. The purpose of this work was also to determine technological and technical conditions comparison for the Al2O3 and SiC ceramic powder alloyed into the surface layer with High Power Diode Laser. There are presented also the investigation results about the determination of proper technical condition during the laser treatment, especially the laser head distance and shielding gas influence. The presented results concerns first of all the structure investigation of the obtained surface layer allowing it to achieve an enhanced hardness and wear resistance more resistant for work, special attention was devoted to monitoring of the layer morphology of the investigated material and on the particle occurred. Light (LM) and scanning electron microscopy (SEM) were used to characterize the microstructure of the obtained surface zones - the remelted zone (RZ) and heat affected zone (HAZ), the ceramic powder distribution and intermetallic phases occurred. A wide range of laser power values was applied and implicated with different laser scan rates. The powders in form of ceramic powders used for alloying were chosen with the particle size of ca. 60μm. This study was conducted to investigate the influence carbide and oxide powder addition on structure and mechanical properties as well the and structure changes occurred during the rapid solidification process. The investigation ensures to use laser treatment for alloying/feeding of ceramic powder particles into the surface of light alloys. The scientific reason of this work is the applying of High Power Diode Laser (HPDL) for improvement of aluminium`s mechanical properties, especially the surface hardness. As the main findings was determined that the obtained surface layer is homogeny without cracks and has a comparably higher hardness value compared to non-treated material. The surface hardness increases together with the applied laser power, the highest power applied gives the highest hardness value for the surface. Also the distribution of the ceramic particles is proper, but there a need for further modelling, because the hardness increases in general according to the laser power used so that the highest power applied gives to highest hardness value in the remelted layer, but for other powder amount or alloy the values should be determined separately, and more data would be necessary to create a model for the technique appliance. The practical purpose of this work is to analysis the impact and application possibility of HPDL laser surface treatment on the cast Al-Si-Cu alloys to deliver application possibilities for diverse branches of industry.
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7

BEHERA, RAJESH KUMAR, SARAT CHANDRA PANIGRAHI, BIRAJENDU PRASAD SAMAL, and PRAMOD KUMAR PARIDA. "MECHANICAL PROPERTIES AND MICRO-STRUCTURAL STUDY OF SINTERED ALUMINIUM METAL MATRIX COMPOSITES BY P/M TECHNIQUE." Journal of Modern Manufacturing Systems and Technology 3 (October 1, 2019): 89–97. http://dx.doi.org/10.15282/jmmst.v2i2.2402.

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Material world requires a strong research to produce a new class of materials having light weight, higher strength and better performances. This has been leads to investigate for high strength light weight alloy. The main objective in developing aluminium metal matrix composites is to provide enhanced characteristic performances and properties above the currently available materials. Based upon the literature a new type of aluminium composite has been tries to develop which will offer attractive mechanical properties such as high strength, easy machinability, appreciable density, and low manufacturing cost etc. Aluminum powders of 99.55% purity and 325 mesh sizes are mixed with alloying metals like Copper, Magnesium, Silicon and Silicon Carbide powders in a precisely controlled quantity. During the process of powder metallurgy (P/M) product preparation, it was minutely observed to attain the maximum efficiency and accuracy. Aluminium (Al) is a light weight material but doesn’t possess a good strength. To achieve this, Copper (Cu), Silicon (Si), Magnesium (Mg) & Silicon Carbide (SiC) powders were blended with it at required proportions. The compaction was carried out with help of a C-45 steel die by power compaction press with a load of 150KN to 250KN. The obtained green products were sintered in a Muffle furnace to produce the final Aluminium Metal Matrix Composites (AMMCs) product.
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8

Zhang, Li Fang, Cui Zhi Dong, Hui Fang Zhang, Xiao Yan Wang, and Shu Long Ma. "Preparation of Zirconia-Aluminum Titanate Nano-Composite Powder." Advanced Materials Research 287-290 (July 2011): 281–84. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.281.

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With zirconium oxychloride, aluminium sulphate and titanium oxysulphate as the basic raw materials, zirconia-aluminum titanate nano-composite powders were prepared with the liquid precipitation method. The nanocomposite powders were detected with XRD, TEM and TG-DTA.The results show that recovery ratio of zirconia and aluminum titanate precursosr is higher, with respective pH about 9.5, 5.5 and concentration of 0.1 mol dm-3 in the system. About several nanometer zirconia and 100 nanometer size aluminum titanate can be obtained when the precursors are respectively roasted at 600°C and 1000°C.
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9

Bućko, Mirosław M., Jakub Domagała, and Radosław Lach. "Consolidation of Aluminium Oxynitride Powders Using Hydrolysis of Aluminium Nitride." Key Engineering Materials 602-603 (March 2014): 170–74. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.170.

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One of the materials with high potential for application as a refractory material is aluminum oxynitride with spinel-type structure, γ-alon. Alon materials, single-phase or composites, are characterized by good mechanical properties, high thermal shock resistance and a high corrosion and erosion resistance. Another advantage is possibility of usage of SHS method for producing of relatively good sinterable powders of γ-alon, however, are characterized by poor compressibility. This paper describes a method of compaction of SHS-derived γ-alon powder using the hydrolysis reaction of aluminum nitride, which is one of the products of SHS synthesis. The green bodies made from the powder with addition of 10 mas.% of water after two weeks of storage reach a strength level up to 30 MPa and an open porosity of less than 30%. Pressureless sintering of the such compacts allows to achieve 95% of theoretical density at 1700°C in less than one minute.
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10

Hartaya, Kendra. "ANALISIS KANDUNGAN ALUMINIUM POWDER PROPELAN BERDASAR ENERGI PEMBAKARAN DARI BOMB KALORIMETER (ANALYSIS OF PROPELLANT’S ALUMINUM POWDER CONTENT BASED ON BURNING ENERGY FROM BOMB CALORIMETER)." Jurnal Teknologi Dirgantara 14, no. 1 (March 19, 2018): 73. http://dx.doi.org/10.30536/j.jtd.2016.v14.a2949.

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It has been analyzed the result of propellant research with variable aluminum content to the combustion energy output . Measurement of the amount of combustion energy carried by the bomb calorimeter. Propellant sample was made by mixing HTPB and aluminium for 15 minutes, adding fine AP for mixing 20 minutes, adding coarse AP for mixing 50 minutes. After stirring ends, the TDI was added and stirred for 15 minutes . Aluminum content in the propellant varies from 8 % to 18 %w . The resulted combustion energy is 2885 cal/g to 3750 cal/g . In 18 % of Al content, burning energy begin to reduce . This reduction was largely caused by burning sample together with the erosiving sample ABSTRAKTelah dilakukan analisis hasil penelitian propelan dengan variabel kandungan aluminium terhadap hasil energi pembakaran. Pengukuran besarnya energi pembakaran propelan dilakukan dengan bomb calorimeter. Sampel propelan dibuat dengan mencampur HTPB dan aluminium selama 15 emnit dilanjutkan pencampuran dengan AP halus selama 20 menit, lalu dengan AP kasar selama 50 mrnit. Setelah pengadukan berakhir maka ditambahkan TDI dan diaduk selama 15 menit. Kandungan Al di variasi dari 8% hingga 18%. Energi pembakaran yang dihasilkan adalah 2885 kal/gr hingga 3750 kal/gr. Pada 18% Al energi pembakaran mulai menurun. Penurunan ini diakibatkan oleh sebagian besar sampel yang terbakar sama dengan sampel yang mengalami erosiv.
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11

Hartaya, Kendra. "ANALISIS KANDUNGAN ALUMINIUM POWDER PROPELAN BERDASAR ENERGI PEMBAKARAN DARI BOMB KALORIMETER." Jurnal Teknologi Dirgantara 14, no. 1 (July 22, 2016): 73. http://dx.doi.org/10.30536/j.jtd.2016.v14.a2569.

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It has been analyzed the result of propellant research with variable aluminum content to the combustion energy output . Measurement of the amount of combustion energy carried by the bomb calorimeter. Propellant sample was made by mixing HTPB and aluminium for 15 minutes, adding fine AP for mixing 20 minutes, adding coarse AP for mixing 50 minutes. After stirring ends, the TDI was added and stirred for 15 minutes . Aluminum content in the propellant varies from 8 % to 18 %w . The resulted combustion energy is 2885 cal/g to 3750 cal/g . In 18 % of Al content, burning energy begin to reduce . This reduction was largely caused by burning sample together with the erosiving sample Abstrak Telah dilakukan analisis hasil penelitian propelan dengan variabel kandungan aluminium terhadap hasil energi pembakaran. Pengukuran besarnya energi pembakaran propelan dilakukan dengan bomb calorimeter. Sampel propelan dibuat dengan mencampur HTPB dan aluminium selama 15 emnit dilanjutkan pencampuran dengan AP halus selama 20 menit, lalu dengan AP kasar selama 50 mrnit. Setelah pengadukan berakhir maka ditambahkan TDI dan diaduk selama 15 menit. Kandungan Al di variasi dari 8% hingga 18%. Energi pembakaran yang dihasilkan adalah 2885 kal/gr hingga 3750 kal/gr. Pada 18% Al energi pembakaran mulai menurun. Penurunan ini diakibatkan oleh sebagian besar sampel yang terbakar sama dengan sampel yang mengalami erosiv.
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12

Khamsuk, Sunisa, K. Choosakull, and P. Wanwong. "Effect of Space Holder Size on the Porous High Purity Aluminum Property." Key Engineering Materials 846 (June 2020): 93–98. http://dx.doi.org/10.4028/www.scientific.net/kem.846.93.

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Porous high purity aluminum was fabricated using a powder metallurgy route combined with the space holder technique. The high purity aluminum powder was mixed with three different particle sizes and contents of the space holder material. The mixed powders were cold compacted at 400 MPa and sintered at 550 °C. The effects of space holder size on the microstructure and mechanical properties of porous high purity aluminum were systematically studied. Results revealed that the size and content of the space holder materials have a significant effect on the mechanical properties of porous aluminium. The compressive strength and hardness of the porous aluminum increased as the size and amount of the space holder material increased and decreased, respectively. The thickness of the cell wall increased with an increase particle size of the space holder material.
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13

Keawpapasson, Pimpawee, Chayanee Tippayasam, Silawat Ruangjan, Pajaree Thavorniti, Thammarat Panyathanmaporn, Alexandre Fontaine, Cristina Leonelli, and Duangrudee Chaysuwan. "Metakaolin-Based Porous Geopolymer with Aluminium Powder." Key Engineering Materials 608 (April 2014): 132–38. http://dx.doi.org/10.4028/www.scientific.net/kem.608.132.

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Porous concretes such as aerated and lightweight concretes are commonly used in construction fields. Lightweight construction materials are used to reduce either the weight or the budget of building structures. Porous concrete production is widely utilised aluminium (Al) powder to increase pores in concrete structures and giving information for porous geopolymer production. It was introduced by adding 0.05-1% Al-powder as the initiated materials of geopolymers, to react with water in those materials and promote hydrogen gas inside specimens. The research, therefore, focused on the synthesis of porous geopolymer by metakaolin as a pozzolan and mixed with alkali solution (8M NaOH and Na2SiO3) as well as Al-powder as a foaming agent. The highly porous geopolymers were produced with various Al-powders as 0%, 0.2%, 0.4%, 0.6% 0.8% and 1% by weight. After 7, 14 and 28 days age, the specimens were tested the mechanical properties, such as compressive and flexural strengths. The water absorption, apparent porosity and bulk density were analyzed at 28 days age. The synthesis of metakaolin-based porous geopolymers with Al-powder presented good results. It showed that Al-powder content affected to degree of porosity of geopolymers. Keywords: Metakaolin based geopolymer, Porous geopolymer, Aluminium powder, Foaming agent, Mechanical and physical properties
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14

Gao, Pei Hu, Lei Li, Jian Ping Li, Zhong Yang, and Yong Chun Guo. "Preparation of Al/SiO2 Composite Coatings on the Surface of Aluminum Alloy through Atmospheric Plasma Spraying." Advanced Materials Research 560-561 (August 2012): 1041–47. http://dx.doi.org/10.4028/www.scientific.net/amr.560-561.1041.

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In this work, Al/SiO2composite coatings were deposited on the surface of aluminum alloy through atmospheric plasma spray. The effects of SiO2volume in Al/SiO2composite powders on the deposition behavior were investigated. It was found that the deposition of the Al/SiO2composite powder became more difficult through plasma spray with the increasing of SiO2contents. There were reactions between aluminium and silicon oxide during the deposition of Al/SiO2powders in the plasma flame. The reactions were helpful to interface cohesions between aluminium and silicon oxide. Al/SiO2(60:40, 80:20) composites were more suitable for deposition and well interface cohesion through atmospheric plasma spray.
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15

Čelko, Ladislav, Simona Hutařová, Martin Petrenec, Karel Obrtlík, Martina Hrčková, and Tomáš Podrábský. "Microstructural Characterization of Slurry Aluminide Diffusion Coatings." Materials Science Forum 782 (April 2014): 584–89. http://dx.doi.org/10.4028/www.scientific.net/msf.782.584.

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Commercially pure aluminium powder and a mixture of aluminium and silicon powders, both in a liquid amyl acetate-based organic binder, were sprayed onto the surface of Inconel 713LC nickel base superalloy. A two-stage heat treatment process in an argon atmosphere flow was designed and applied to produce nickel aluminide diffusion coatings. Two coating systems composed of different layers with gradual changes in chemical composition and phase quantities were formed. Scanning electron microscope, scanning electron microscope/focused ion beam, both equipped with energy dispersive microanalyzers, were utilized to characterize the microstructure and chemical composition of the coatings.
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16

Nishimura, Toshiyasu, Xin Xu, Naoto Hirosaki, K. Kimoto, Yoo Yamamoto, and Hiroaki Tanaka. "Effect of Aluminium on High-Energy Ball Milling and Spark Plasma Sintering of Silicon Nitride." Key Engineering Materials 287 (June 2005): 156–59. http://dx.doi.org/10.4028/www.scientific.net/kem.287.156.

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A commercial silicon nitride powder with oxide sintering additives was ground with high-energy ball mill to obtain nano-sized powder. Metallic aluminium powder was added as a grinding additive. Effect of high-energy ball milling was evaluated by X-ray diffraction analysis. After milling, height of background increased and peak height of silicon nitride decreased in XRD chart, which suggested that vitrification and/or decrease in grain size of silicon nitride occurred. The milled powders were sintered by spark plasma sintering system. Aluminium nitride was formed during sintering by reaction of aluminium and atmospheric nitrogen. Dense nano-ceramics, which were composed of silicon nitride and sialon, were obtained by sintering at 1550 oC.
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17

Nasir, Nurulfazielah, Ridhwan Jumaidin, Hady Efendy, Mohd Zulkefli Selamat, Goh Keat Beng, and Muhammad Zulfattah Zakaria. "Preparation of Macroporous Ceramic Materials by Using Aluminium Powder as Foaming Agent." Applied Mechanics and Materials 699 (November 2014): 336–41. http://dx.doi.org/10.4028/www.scientific.net/amm.699.336.

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Aluminium powder was used as foaming agent in the production of macro-porous alumina ceramic. The porous ceramic material was developed by mixing an appropriate composition of cement, aluminium powder (Al), alumina (Al2O3), calcium oxide (CaO), gypsum (calcium sulphate dehydrate, CaSO4.2H2O), silica powder and deionized water. Different compositions of porous ceramic were produced at 2wt.%, 3wt.% and 4wt.% of aluminium powder. Their mechanical properties and macro-porosity structural of the porous ceramic material were analysed and compared. It is determined that the optimal properties of porous ceramic material were found at 3wt.% of aluminium powder and degraded drastically at 4wt.%. This phenomenon is due to the chemical reaction between the aluminium powder and DI water in which they form aluminium oxide that promotes the strength of the material but at the same time, more pores are created at higher reaction rate between these two fundamental materials.
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18

Sarkar, Pujan, Nipu Modak, and Prasanta Sahoo. "Mechanical Characteristics of Aluminium Powder Filled Glass Epoxy Composites." International Journal of Engineering and Technologies 12 (October 2017): 1–14. http://dx.doi.org/10.18052/www.scipress.com/ijet.12.1.

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Mechanical characteristics of glass epoxy and aluminium powder filled glass epoxy composites are experimentally investigated using INSTRON 8801 testing device as per ASTM standards. With a fixed wt% of fiber reinforcement, glass epoxy and 5-15 wt% aluminium powder filled glass epoxy composites are fabricated in conventional hand lay-up technique followed by light compression moulding process. Experimental results show that aluminium powder as a filler material influences the mechanical properties. Density and void fraction in composites increase whereas steady decrease of tensile strength is recorded with aluminium powder addition. Micro hardness, flexural strength, inter laminar shear strength (ILSS) of 5 and 10 wt% aluminium content composites are improved compared to unfilled glass epoxy composite and with further addition of aluminium up to 15 wt% decreasing trends are observed. Glass epoxy with 5 wt% aluminium concentration shows the highest improvement. Tensile modulus for aluminium addition of 5 wt% decreases whereas 10 wt% aluminium filled composite shows improvement in tensile modulus. These are explained on the basis of material properties, void fractions and bonding strength among the constituents.
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19

Zymla, Anna, Victor Zymla, and Jean-Bernard Guillot. "A Mechanism for Aluminium Powder Nitridation." Key Engineering Materials 132-136 (April 1997): 844–47. http://dx.doi.org/10.4028/www.scientific.net/kem.132-136.844.

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20

Bose, Animesh. "New Horizons in Aluminium Powder Metallurgy." Key Engineering Materials 8 (January 1985): 53–76. http://dx.doi.org/10.4028/www.scientific.net/kem.8.53.

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21

Ghosh, S., K. S. Pal, N. Dandapat, A. K. Mukhopadhyay, S. Datta, and D. Basu. "Characterization of microwave processed aluminium powder." Ceramics International 37, no. 3 (April 2011): 1115–19. http://dx.doi.org/10.1016/j.ceramint.2010.10.012.

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22

Chang, An-Jae, Shi-Woo Rhee, and Sunggi Baik. "Nitridation characteristics of floating aluminium powder." Journal of Materials Science 30, no. 5 (March 1995): 1180–86. http://dx.doi.org/10.1007/bf00356117.

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23

Li, Y. Q., T. Qiu, J. Xu, and X. C. He. "Surface modification of aluminium nitride powder." Journal of Materials Science Letters 15, no. 20 (1996): 1758–61. http://dx.doi.org/10.1007/bf00275333.

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24

Cintas, J., E. S. Caballero, J. M. Montes, F. G. Cuevas, and C. Arevalo. "Nanocrystalline Al Composites from Powder Milled under Ammonia Gas Flow." Advances in Materials Science and Engineering 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/617241.

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The production of high hardness and thermally stable nanocrystalline aluminium composites is described. Al powder was milled at room temperature in an ammonia flow for a period of less than 5 h. NH3dissociation during milling provokes the absorption, at a high rate, of nitrogen into aluminium, hardening it by forming a solid solution. Controlled amounts of AlN and Al5O6N are formed during the subsequent sintering of milled powders for consolidation. The pinning action of these abundant dispersoids highly restrains aluminium grain growth during heating. The mean size of the Al grains remains below 45 nm and even after the milled powder is sintered at 650°C for 1 h.
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25

Zientara, Dariusz, Mirosław M. Bućko, and Jerzy Lis. "Dense γ-Alon Materials Derived from SHS Synthesized Powders." Advances in Science and Technology 45 (October 2006): 1052–57. http://dx.doi.org/10.4028/www.scientific.net/ast.45.1052.

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Dense polycrystalline aluminium oxynitride with spinel structure, γ-alon, is noted for its excellent thermal properties, high-temperature mechanical properties, low dielectric constant, thermal expansion coefficients and intrinsic transparency extending from ultraviolet to mid-infrared wavelengths. The conventional way for synthesis of γ-alon powder is high-temperature reaction of aluminium nitride and corundum in pure nitrogen or a vacuum. The dense materials are made by reactive pressureless sintering or hot-pressing of a powder compact. This work is focused on preparation of γ-alon materials derived from SHS synthesized powders. The powders for sintering were synthesized from mixtures of aluminium and corundum powders of different proportions. The products of the SHS synthesis were composed mostly of γ-alon and aluminium nitride with small amount of non-reacted substrates. Ground powders were hot-pressed at 1750, 1850 and 1950°C for 1 h under 25 MPa in nitrogen flow. Such procedure allowed dense material composed of pure γ-alon with good mechanical properties to obtain.
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26

Stobierska, Ewa, Mirosław M. Bućko, Jerzy Lis, and Katarzyna Kuźmińska. "Colour Properties of Y2O3-Al2O3-Cr2O3 Pigments as a Result of Precursors Morphology." Advances in Science and Technology 68 (October 2010): 202–7. http://dx.doi.org/10.4028/www.scientific.net/ast.68.202.

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Double yttrium-aluminium oxide with perovskite structure (YAP) doped with chromium(III) ions seems to be a promising material for red pigments for new ceramic bodies and glazes. The aim of the present paper was to examine the influence of the precursors morphology on colour properties of the YAP pigments. Two kinds of aluminium hydroxide powders were used, fine- and coarse-grained. The fine Al(OH)3 powder was amorphous with D50=4.58 µm and the coarse one was crystalline gibbsite with D50=42.4 µm. It was stated that using of aluminium hydroxide powders of different morphology led to substantial differences in phase composition of the final materials. Using coarse-grained aluminium hydroxide powder caused formation of over 95 wt% of YAP phase whereas the pigments prepared with amorphous aluminium hydroxide contain significant amounts of other phases in the Y2O3-Al2O3 system. The differences in phase compositions resulted in differences in colour properties of the pigments.
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27

Sarathi, Ramanujam, Binu Sankar, and Satyanarayanan Chakravarthy. "Influence of Nano Aluminium Powder Produced by Wire Explosion Process at Different Ambience on Hydrogen Generation." Journal of Electrical Engineering 61, no. 4 (July 1, 2010): 215–21. http://dx.doi.org/10.2478/v10187-010-0030-7.

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Influence of Nano Aluminium Powder Produced by Wire Explosion Process at Different Ambience on Hydrogen Generation Nano-aluminium particles are produced through the wire explosion process in different gas medium. The particles produced by wire explosion process, in helium medium are of smaller size compared to argon/nitrogen medium. The nano aluminium powder on reaction with water forms oxides having bayerite and boehmite structure. It is observed that nano aluminium on reaction with KOH solution at room temperature it forms bayerite. The results of the study were confirmed through Wide Angle X-ray diffraction (WAXD) and by Transmission Electron Microscope (TEM) studies. The reaction of nano aluminium powder with KOH solution/water indicates that the rate of hydrogen generation is high when nano aluminium powder reacts with KOH solution than with water. The rate of hydrogen generation gets reduced drastically when the nano aluminium powder which is exposed to air medium for some period is used for reaction with KOH/water. It is also observed that the rate of hydrogen generation is high with nano size aluminium particles compared with ultrafine particles.
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Et. al., M. K. Karthik,. "Finite Element Analysis of Aircraft Radial Engineconnecting Rod Using Composite Material." Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 1S (April 11, 2021): 527–30. http://dx.doi.org/10.17762/turcomat.v12i1s.1920.

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The main objective of this project is analysis of Aircraft radial engine connecting rod by using fiber matrix composite materials in this type of composite materials to improve their ductility properties aluminium metal powder will be added in the matrix components like epoxy resin elements from the resin considerations the metal powder will be 5-10% of the weight of aluminium powder only added, the comparison of the existing material with GFRP Reinforced aluminium powder and Pure GFRP Material from the comparison of stress, strain and deformation results from the ANSYS Software GFRP with Aluminium powder material will get best results
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Kochmańska, A. E. "Aluminide coatings on Inconel 617 obtained by slurry method with inorganic binder." Journal of Achievements in Materials and Manufacturing Engineering 2, no. 85 (December 1, 2017): 49–55. http://dx.doi.org/10.5604/01.3001.0010.8034.

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Purpose: The aim of this study was to manufacture and examine the structure of aluminide coatings formed on Ni-based super alloy Inconel 617 in an argon atmosphere. Design/methodology/approach: The coatings were produced by the slurry method at temperatures from 900 to 1100°C and times from 2 to 6 hours. The newly-developed slurry composition was: powders of aluminium and silicon; NaCl, KCl, NaF halide salts as an activator and a water solution of a soluble glass as an inorganic binder. The microstructure (SEM), chemical composition (EDS) and phase composition (XRD) of the coatings were determined. Additionally the correlation between the technological parameters and the coating thickness was analysed. Findings: Slurry aluminide coatings with newly-developed composition have been successfully produced. The obtained coatings had a multi-zone structure depending on manufacturing parameters. Research limitations/implications: The next stage of this research will be to determine the performance of the coatings under high temperature cyclic oxidation. Optimization of the production parameters will therefore be possible after oxidation and cyclic oxidation tests. Practical implications: The slurry method is economical due to low consumption of powder material. Another advantage of the applied slurry composition is the possibility of forming protective coatings on other substrates. Originality/value: The use of the inorganic binder in the slurry allowed to produce the coatings in one single step without additional annealing at an intermediate temperature as it is when applied organic binder. The grain size of aluminium and silicon powders was less than usually used. The applied activator dissolved the passive layers present on the surface both of the aluminum powder and of the nickel alloy and accelerated the reactions that occur during coating formation.
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Niu, Hui Jun, Zhi Yi Zhang, Wei Guo, Yi Xue, and Zhen Xing Yao. "Mechanical, Morphological and Thermally Behaviors of Natural Rubber/Aluminum Powder Composites." Key Engineering Materials 501 (January 2012): 289–93. http://dx.doi.org/10.4028/www.scientific.net/kem.501.289.

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Different content of aluminum powder was mixed into natural rubber. Aluminum powder was modified by different coupling agents via wet method, and the modified aluminum filler/NR composite was prepared. The mechanical properties, thermal conductivity and thermogravimetric analysis of the composites was investigated. The results showed that the best physical properties and thermal conductivity of composites were achieved with saline coupling agent Si-69, and Thermo decomposing temperature of 3%TM-38S matching composites improved evidently. SEM test indicated that boundary surface of aluminium fillers and rubber was obviously improved when aluminum powder was modified by coupling agent, which would result in preferable mechanical property. The result of Thermogravimetric analysis showed that after aluminum powder filler was modified by three coupling agents, thermo decomposing temperature and hot lost weight of composites rose obviously. With the increase of Al powder content the thermal conductivity improved greatly, Thermal conductivity of Al/NR composites lay between 0.25 and 0.47 W·m-1·K-1.
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Pakieła, W., L. A. Dobrzański, K. Labisz, T. Tański, K. Basa, and M. Roszak. "The Effect of Laser Surface Treatment on Structure and Mechanical Properties Aluminium Alloy ENAC-AlMg9." Archives of Metallurgy and Materials 61, no. 3 (September 1, 2016): 1343–50. http://dx.doi.org/10.1515/amm-2016-0221.

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Abstract In this work, the influence of a high power diode laser surface treatment on the structure and properties of aluminium alloy has been determined. The aim of this study was to improve the mechanical and tribological properties of the surface layer of the aluminium alloy by simultaneously melting and feeding tungsten carbide particles into the molten pool. During the process was used high-power diode laser HPDL. In order to remelt the aluminium alloy surface the HPDL laser of 1.8, 2.0 and 2.2 kW laser beam power has been used. The linear laser scan rate of the beam was set 0.5 cm/s. In order to protect the liquid metal during laser treatment was used argon. As a base material was used aluminium alloy ENAC-AlMg9. To improve the surface mechanical and wear properties of the applied aluminium alloy was used biphasic tungsten carbide WC/W2C. The size of alloying powder was in the range 110-210 µm. The ceramic powder was introduced in the remelting zone by a gravity feeder at a constant rate of 8 g/m.
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Mendes, Marcio W. D., António Carlos P. Santos, Francisca de Fatima P. Medeiros, Clodomiro Alves Jr., A. G. P. Silva, and Uilame Umbelino Gomes. "Aluminothermic Reduction of Niobium Pentoxide in a Hydrogen Plasma Furnace." Materials Science Forum 514-516 (May 2006): 599–603. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.599.

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The aluminothermic reduction is a highly exothermal reaction between a metal oxide and aluminium. Conventionally this reaction is ignited by an electric resistance and the reaction products after cooling are in the form of a rigid block of mixed metal and aluminium oxide. In this work a new process of aluminothermic reduction is presented, in which the reaction is ignited by a hydrogen plasma. The niobium oxide and aluminium powders are high energy milled for six hours to form particles constituted of oxide and aluminum. Stoichiometric, substoichiometric and superstoichiometric mixtures were prepared. The mixture was placed in a stainless steel tube (the hollow cathode) inside the reactor chamber. The chamber was firstly evacuated. Then hydrogen at low pressure was introduced. In the following an electric discharge between the cathode and the anode localized just above the cathode ignites the plasma. The plasma heats the particles on the surface of the powder layer and starts the reaction that proceeds in each particle since the reactants are intimately mixed. The heat generated by the reaction propagates deeper in the layer until the whole mixture reacts. Substoichiometric mixtures can be used because hydrogen takes part of the reduction. The Nb2O5 – Al starting powder mixture and the products of the reaction are characterized by laser grain size measurement and X-Ray diffraction (XRD). The products are in form of powder or agglomerates of particles. Phases of reaction products was determined by XRD analysis and the particle size trough SEM.
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Śusniak, M., J. Karwan-Baczewska, J. Dutkiewicz, M. Actis Grande, and M. Rosso. "Structure Investigation of Ball Milled Composite Powder Based on AlSi5Cu2 Alloy Chips Modified by Sic Particles." Archives of Metallurgy and Materials 58, no. 2 (June 1, 2013): 437–41. http://dx.doi.org/10.2478/amm-2013-0014.

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The paper is focused on the processing of aluminum alloy chips using powder metallurgy. Chips obtained from recycled AlSi5Cu2 alloy were ball milled with the addition of silicon carbide powder with an average size of 2μm. Mechanical alloying process was employed to obtain homogeneous composite powder. The effect of processing time (0 - 40h) on the homogeneity of the system was evaluated, as well as a detailed study of the microstructure of AlSi5Cu2 aluminum chips and SiC particles during MA was carried out. Addition of silicon carbide (10, 20wt%) to recycled aluminium chips and application of MA lead to fragmentation of the homogeneous composite powder down to particle size of about 3μm and spheroidization. The addition of hard SiC particles caused reinforcement and reduced the milling time. Higher content of silicon carbide and longer processing time allowed to obtain AlSi5Cu2/SiC powders with microhardness ∽500HV0,025. The results of MA were investigated with SEM, EDS, LOM, XRD and showed that relatively homogeneous distribution of SiC reinforcements in the matrix as well as grain refinement of aluminum solid solution down to 50nm can be obtained after 40h of processing.
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34

Kent, Damon, Graham B. Schaffer, Ma Qian, and Zhen Yun Liu. "Formation of Aluminium Nitride during Sintering of Powder Injection Moulded Aluminium." Materials Science Forum 618-619 (April 2009): 631–34. http://dx.doi.org/10.4028/www.scientific.net/msf.618-619.631.

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A TEM study of aluminium nitride formed during sintering of powder injection moulded aluminium under nitrogen is presented. A polycrystalline layer consisting of fine, rod-shaped crystallites of hexagonal AlN formed on the Al powder surfaces. The grain boundaries exhibit a double layer of AlN separated by a thin layer of Al. The structure of the AlN is characterised and its influence upon sintering discussed.
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35

Jiang, Z., C. Lucien Falticeanu, and I. T. H. Chang. "Warm Compression of Al Alloy PM Blends." Materials Science Forum 534-536 (January 2007): 333–36. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.333.

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With the onging trend of reducing the weight of automotive parts, there is also an increasing trend in the use of light alloys. Recently, aluminum powder metallurgy has been the subject of great attention due to the combination of the lightweight characteristics of aluminium and the efficient material utilisation of the powder metallurgical process, which offer attractive benefits to potential end-users. Conventional press and sinter route of non-ferrous P/M products are based compaction at room temperature prior to the sintering cycle. However, warm compaction process has successfully provided increased density in ferrous powder metallurgy parts, which contributes to better mechanical properties and consequently overall performance of those parts. This study is aimed at exploring the use of warm compaction process to aluminium powder metallurgy. This paper presents a detailed study of the effect of warm compression and sintering conditions on the resultant microstructures and mechanical properties of Al-Cu-Mg-Si PM blend.
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36

Belskii, Sergei S., and Maksim V. Chantsev. "Industrial Production Technology for Aluminium Paste." Defect and Diffusion Forum 410 (August 17, 2021): 847–52. http://dx.doi.org/10.4028/www.scientific.net/ddf.410.847.

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Today, the development of aluminium industry is highly dynamic. Aluminium production rightly takes top positions in the global metal market. Unique properties of aluminium mean that it is widely used in various industries. The construction industry is no exception – here, aluminium is actively used as a gassing agent for production of steam-cured aerated concrete, which is produced by mixing Portland cement, sand, water and aluminium fine powder or aluminium paste. The main disadvantage of aluminium fine powder is its high degree of dusting: at certain air concentration levels, this becomes fire-and explosion-prone. This is the reason the producers add complex organic additives into their aluminium fine powder: to ensure lower dusting levels and produce an aluminium paste, which is safer to use. This work focuses on obtaining an aluminium paste with sufficient share of organic additives to ensure the efficient performance of aluminium paste as a gassing agent in the production of steam-cured aerated concrete. A number of tests were carried out on mixing aluminium fine powder with various organic additives (fatty additive; wetting agent and gassing kinetics stabiliser; dedusting agent) in different ratios. The paper analyses the quality of distribution of organic additives inside the finished product and studies the relevant gassing kinetics.
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37

Epaarachchi, Jayantha Ananda, and Matthew T. Reushle. "Performance of Aluminium / Vinylester Particulate Composite." Materials Science Forum 654-656 (June 2010): 2656–59. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.2656.

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The performances of aluminum /vinylester particulate-composites were studied in detail in order to investigate its suitability for engineering applications. This study examined the suitability of atomised aluminum particles for particulate reinforcement of a vinyl ester resin. Mechanical properties were obtained for the composite by testing various percentages of aluminium powder (75-150 m) and vinylester resin. It has been found that the inclusion of Al powder has not significantly changed the properties of vinylester resin, however an improvement in the ductility of the composite has been recorded. The optimal performances of the composite were exhibited by 15% Al composition. The properties of the particulate composites were modeled using numerous empirical models. Unfortunately a significant difference was found between some of the experimental and predicted properties of the Al/vinylester particulate composite. This paper intends to detail the variation of mechanical properties with the change of Al volume fraction in the composite and the performances of empirical models in prediction of the properties of particulate composites.
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38

Labisz, Krzysztof, Tomasz Tański, Beata Krupińska, Mariusz Krupiński, and Wojciech Pakieła. "HPDL Laser Alloying of Al-Si-Cu Alloy with ZrO2 Powder." Advanced Materials Research 1036 (October 2014): 434–39. http://dx.doi.org/10.4028/www.scientific.net/amr.1036.434.

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The purpose of this paper was the investigation of laser treatment influence on the microstructure and properties of the surface layer of heat treated Al-Si-Cu cast aluminium alloys, using the high power diode laser (HPDL). The performed laser treatment involves remelting and feeding of ZrO2 ceramic powder into the aluminium surface. Based on the performed investigations it was possible to obtain the layer consisting of the heat affected zone, transition zone and remelted zone, without cracks and defects as well as has with a slightly higher hardness value compared to the non remelted material. The laser power range was chose as 1.5 to 2.0 kW and implicated by one process speed rate of 0.25 m/min. Also a powder size was used for alloying with the particle size of ca. 100 μm. The hardness value increases according to the laser power used so that the highest power applied gives to highest hardness value in the remelted layer [1-8]. The carried out investigations allow to conclude, that as a result of alloying of the heat-treated cast aluminium alloys with oxide ceramic powder the surface layer can be enriched with the powder particle and in some cases a high-quality top layer is possible to obtain. Very often to determine conditions of laser treatment are being used the numerical methods that would significantly shorten the time to find the most optimal parameters. [8]. Concerning original practical implications of this work there was important to investigate the appliance possibility of High Power Diode Laser (HPDL) for enhancement of the aluminium surface properties, especially the wear resistance and hardness. the scientific reason was also to describe structure changes and processes occurred in the laser remelted surface aluminium layer after ZrO2 feeding using HPDL laser [10-1. .
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39

Kent, D., M. Qian, and G. B. Schaffer. "Formation of aluminium nitride during sintering of powder injection moulded aluminium." Powder Metallurgy 53, no. 2 (June 2010): 118–24. http://dx.doi.org/10.1179/003258909x12523294330154.

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40

Nakamura, Tamotsu, Masashi Hiraiwa, Haruki Imaizumi, and Yasuji Tomizawa. "Friction-Assisted Extrusion of Aluminium Thin Strips from Pure Aluminium Powder." Transactions of the Japan Society of Mechanical Engineers Series C 59, no. 557 (1993): 199–204. http://dx.doi.org/10.1299/kikaic.59.199.

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41

Cintas, Jesus, Juan M. Montes, Francicso Gomez Cuevas, and José M. Gallardo. "Influence of PCA Content on Mechanical Properties of Sintered MA Aluminium." Materials Science Forum 514-516 (May 2006): 1279–83. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.1279.

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Aluminium powder has been mechanically milled using different amounts of process control agent (PCA). Mechanically alloyed aluminium powder (MA Al) was prepared by attrition milling in the presence of 1.5 and 3wt.% of an EBS wax. Milling was carried out in vacuum during 10 h. Milled powders were consolidated by a press-and-sintering method. This consolidation method is not usually employed with MA Al powders. The amount of dispersed carbides formed in the Al powder increases with the percentage of PCA. These carbides restrain Al grain growth during sintering, resulting in consolidated compacts with a grain size of about 550 nm. Thus, these PM materials can be considered ultrafine grained materials. Due to grain refinement and dispersion strengthening, the tensile strength of MA Al specimens is increased remarkably.
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42

Ariffin, Nurliyana, Mohd Mustafa Al Bakri Abdullah, Przemysław Postawa, Shayfull Zamree Abd Rahim, Mohd Remy Rozainy Mohd Arif Zainol, Ramadhansyah Putra Jaya, Agata Śliwa, et al. "Effect of Aluminium Powder on Kaolin-Based Geopolymer Characteristic and Removal of Cu2+." Materials 14, no. 4 (February 8, 2021): 814. http://dx.doi.org/10.3390/ma14040814.

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This current work focuses on the synthesis of geopolymer-based adsorbent which uses kaolin as a source material, mixed with alkali solution consisting of 10 M NaOH and Na2SiO3 as well as aluminium powder as a foaming agent. The experimental range for the aluminium powder was between 0.6, 0.8, 1.0 and 1.2wt%. The structure, properties and characterization of the geopolymer were examined using X-Ray Diffraction (XRD), Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). Adsorption capacity and porosity were analysed based on various percentages of aluminium powder added. The results indicate that the use of aluminium powder exhibited a better pore size distribution and higher porosity, suggesting a better heavy metal removal. The maximum adsorption capacity of Cu2+ approached approximately 98%. The findings indicate that 0.8% aluminium powder was the optimal aluminium powder content for geopolymer adsorbent. The removal efficiency was affected by pH, adsorbent dosage and contact time. The optimum removal capacity of Cu2+ was obtained at pH 6 with 1.5 g geopolymer adsorbent and 4 h contact time. Therefore, it can be concluded that the increase in porosity increases the adsorption of Cu2+.
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43

Iskandar, Edi, Hafrizon Hafrizon, Wiwiek Nuralimah, Hairul Arsyad, and Lukmanul Hakim Arma. "DISAIN DAN PEMBUATAN ALAT ATOMISASI ALUMINIUM." Jurnal Teknik Mesin Sinergi 18, no. 2 (December 9, 2020): 163. http://dx.doi.org/10.31963/sinergi.v18i2.2626.

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Metal powder is the main raw material in the manufacture of powder metallurgy-based products. Powder-making is the initial step before the powder is packed and pressed in a mold to form the desired product. This research designs and fabricates an atomizer to produce powder from liquid aluminum using a pressurized water jet system. The research stage starts from the drawing of the tool design by considering the volume of liquid aluminum, the diameter of the outlet of liquid metal, the air pressure, and the angle of attack of the water beam. The second stage is the manufacture of the atomization chamber by referring to the design drawing by making parts of the tool/frame, liquid metal feeder parts, making the walls of metal plates, making the nozzle holder, and collecting the powder parts and the water exhaust channel. The third stage is assembly, which is to unite the main parts of the aluminum atomizer. The final stage is the testing of the atomization tool using 250 Psi pressurized water with variations of attack angle was 30˚, 35˚, 40˚, 45˚, and 50˚ with a metal descending channel diameter of 5 mm. The results showed that the 45o spray angle gave the highest percentage of powder amount and the lowest 40o angle resulted in the size of aluminum metal powder in the range 0.105 mm-0.5 mm. The size of the powder was obtained at an angle of attack of 35o, which is an average of 39.5 um, and the largest size of powder was obtained at a spray angle of 40o of 89.5 um. The resulting powder form is irregular in shape, flakes (flakes), spheroid (spherical), and spongy (hollow).
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44

Bolaños-Bernal, Sergio Esteban, and Irma Angarita-Moncaleano. "Graphene reinforced aluminum matrix composite obtaining by powder metallurgy." ITECKNE 16, no. 2 (December 16, 2019): 18–24. http://dx.doi.org/10.15332/iteckne.v16i2.2353.

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Several researchers have reported graphene as an ideal reinforcement for composite materials due to its interesting properties [1]. The graphene-reinforced aluminium matrix composite material was obtaining by powder metallurgy. This study investigated the effect of aluminum powder morphology on compaction capacity and mechanical strength of composite material. Different milling times were used to determine the optimal time required in manufacturing. The proper compaction load was determined change its values and analyzing the effect of the different loads on the characteristics of the composite. Sintering parameters were established according to previous studies employed by other researchers. Finally, it is determined that with 0.5% wt graphene presents phenomena of grain refinement and higher electrical conductivity of the compound with respect to powder metallurgical aluminum.
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45

N, Gupta. "Defluoridation of Groundwater using Low Cost Adsorbent like Bagasse Dust, Aluminium Treated Bagasse Flyash, Bone Powder and Shell Powder." Bonfring International Journal of Industrial Engineering and Management Science 4, no. 2 (May 9, 2014): 72–75. http://dx.doi.org/10.9756/bijiems.10299.

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46

WANG, CAILI, SHUILIN ZHENG, GUIHUA LIU, LIJING WANG, PENG HUANG, and ZHAOHUA WANG. "PREPARATION OF WOLLASTONITE COATED WITH NANO-ALUMINIUM SILICATE AND ITS APPLICATION IN FILLING PA6." Surface Review and Letters 17, no. 02 (April 2010): 265–70. http://dx.doi.org/10.1142/s0218625x10014144.

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Taking wollastonite as raw material, aluminium sulfate and water glass as coating modifier, a new type of wollastonite coated with nano-aluminium silicate powder-materials was obtained by chemical depositing method. By modificating this powder-materials with silane and filling it in PA6, the PA6 composite materials were obtained. The modificated powder-materials were characterized by SEM, BET, XRD, EDX, and FT-IR. The mechanism of this powder-materials modificated by silane was discussed. It was shown that the surface of wollastonite was coated with nano-aluminium silicate evenly, the average grain size of aluminium silicate was 54 nm, filling 30% of this powder-materials modified by silane in PA6, the mechanical properties and the heat distortion temperature of the PA6 composites filled by it were notably enhanced.
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47

Samiee, Alireza, Mohammad Hosein Bina, and Mahmood Meratian. "Influence of Surface Modification of Alumina on Improvement of Wetability in Aluminium Matrix Composite." Advances in Materials Science and Engineering 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/746470.

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In this research, aluminium powder (50 wt%) and alumina (50 wt%) were first milled at a specific ball-to-powder ratio in a high-energy planetary mill at different times to manufacture Al-Al2O3composite. Then, the capsules of powdery composites (Al-Al2O3)CPproduced at the milling stage were added to aluminium melt and cast through ex situ. Scanning electron microscope SEM was used to study the morphology of the capsules and the microstructure of the produced composite. The percentage of powdery composite capsules and reinforcing particles present in the microstructure of Al-Al2O3composite was measured by Image Tool software. The results of the tests showed that, by optimizing the milling time to 5 hours, the alumina particles are sufficiently placed in the matrix of the capsules; on the other hand, alumina particles are also properly coated with aluminium powder. When these capsules are added to aluminium melt, the rate of the wetting of alumina particles greatly increases and accordingly the percentage of the reinforcing particles in the cast composite matrix increases dramatically. By surface modification and accordingly increasing percentage of Al2O3, the tensile strength increases and the tensile strength of the composites is higher than that of the matrix alloy.
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48

Feng, Guo, Wei Hui Jiang, Jian Min Liu, Quan Zhang, Zi Hu, Li Feng Miao, and Qian Wu. "Low-Temperature Synthesis of Magnesium-Stabilized Aluminum Titanate Powder via Non-Hydrolytic Sol-Gel Method." Materials Science Forum 848 (March 2016): 319–23. http://dx.doi.org/10.4028/www.scientific.net/msf.848.319.

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Magnesium-stabilized aluminum titanate powder was prepared via non-hydrolytic sol-gel method using titanium tetrachloride and anhydrous aluminium chloride as precursors, anhydrous ethanol as the oxygen donor, magnesium powder, magnesium fluoride, magnesium ethoxide and anhydrous magnesium acetate as stabilizers. The effect of magnesium stabilizers on low temperature synthesis of aluminum titanate was investigated, and their role and mechanism in stabilizing aluminum titanate were also studied by XRD, FT-IR and thermal expansion dilatometer. The results show that introducing magnesium powder or magnesium fluoride can’t stabilize aluminum titanate, they also lead to the failure of aluminum titanate low-temperature synthesis at 750 °C due to its promotion of non-hydrolytic homogeneous condensation. Anhydrous magnesium acetate and magnesium ethoxide can react with aluminum alkoxide and titanium alkoxide in the precursor mixture to form heterogeneous condensation bonds, which promotes magnesium ion to dope into aluminum titanate lattice at 750 °C, and hence to improve its thermal stability.
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Wei, Jun Cong, and Jun Bo Tu. "Effect of Aluminium Powder on the Hot Mechanical Properties of Corundum-Silicon Nitride Composites." Advanced Materials Research 189-193 (February 2011): 3960–63. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.3960.

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Based on the Al-O-N phase stable diagram and adopting inverse reaction sintering process, corundum-silicon nitride composite refractories were prepared using corundum, silicon nitride, clay and aluminium powder as the main starting materials. The specimens were sintered at 1600 for 3 hours under air atmosphere with different oxygen partial pressure obtained by addition of different amount of aluminium powder. The effects of aluminium powder additions(0, 4wt.%, 8 wt.% and 12 wt.% respectively) on the hot modulus of rupture were investigated .The phase composition and microstructure were tested by means of XRD, SEM and EDAS.The results showed that aluminium would be oxidized, nitrided and displaced as aluminium powder increased during sintering, which reduced the oxygen partial pressure in the specimen. The hot modulus of rupture (HMOR) increased considerably due to large amounts of fibrous sialon formed.
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50

Ko, Seh Yun, Bo Young Kim, Yong In Kim, Taeh Yeong Kim, Ki Tae Kim, Brian J. McKay, and Je Sik Shin. "Manufacture of CNTs-Al Powder Precursors for Casting of CNTs-Al Matrix Composites." Materials Science Forum 765 (July 2013): 353–57. http://dx.doi.org/10.4028/www.scientific.net/msf.765.353.

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CNTs-Al matrix composites are considered to be promising heat dissipating materials because thermal conductivity can potentially be improved whilst their density is reduced. Although casting has many advantages in the fabrication of large, complex components, this process cannot be easily employed when manufacturing CNTs-Al composites. In order to produce CNTs-Al matrix composites by casting a CNTs-Al powder precursor was manufactured using mechanical milling and electroless plating processes. Aluminium powder with CNTs of 10 wt.% and 20 wt.% were mixed and ball milled using a horizontal mill. After milling for 3 hrs., the milled powder exhibits a flattened morphology with a band-type distribution of CNT clusters observed within the aluminium particles. Prolonged milling of up to 24 hrs. introduces an equiaxed particle shape for the milled powders with a uniform distribution of CNTs within the aluminium particles. However, as milling time increases, the CNTs become fractured by ball-to-ball collisions. There was no reaction evident between the aluminium and the CNTs at milling times up to 24 hrs. In order to improve the wettability between the CNTs-Al powder precursor and Al melt during the casting process, electroless Ni plating was performed. The processing time for the Ni-plating affects the uniformity of the coating layer. For a uniform coating condition, the average thickness of the coating was ~1.87 μm, with no evidence of gaps between the milled powders and coatings observed.
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