Bibliografie tematiche / Aluminia / Articoli di riviste
Segui questo link per vedere altri tipi di pubblicazioni sul tema: Aluminia.

Articoli di riviste sul tema "Aluminia"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 5 febbraio 2022

Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili

Scegli il tipo di fonte:

Vedi i top-50 articoli di riviste per l'attività di ricerca sul tema "Aluminia".

Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.

Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.

Vedi gli articoli di riviste di molte aree scientifiche e compila una bibliografia corretta.

1

Feng, Chun Xia, Jing Hua Chen, Wei Guo, Bao Xiang Jiao, and Hong Bin Lu. "Aluminium Titanate-Aluminia Composites Synthesized by Heterogeneous Precipitation Method." Applied Mechanics and Materials 217-219 (November 2012): 3–7. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.3.

Testo completo
Abstract (sommario):
Aluminium titanate-alumina (AT-A) composites were sintered from the precursor powders prepared by two different methods: a simple sol-gel based heterogeneous precipitation method and a traditional blending method. The crystalline phase, microstructure, mechanical strength, sintering properties, and thermal expansion coefficient (TEC) of the sintered AT-A composites were investigated and compared. The heterogeneous precipitation method increases the homogeneity of the precursor powders and improves the mechanical and sintering properties of the AT-A composites. The AT-A composites with a Al:Ti
Gli stili APA, Harvard, Vancouver, ISO e altri
2

Wang, Miao, Yan Xia Guo, Fang Qin Cheng, and Yao Yao Li. "A Study on the Mechanism of Aluminia Extraction from Coal Fly Ash." Advanced Materials Research 518-523 (May 2012): 3109–14. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.3109.

Testo completo
Abstract (sommario):
Coal fly ash contains large amounts of aluminum, iron, silicon and other useful elements. Its utilization effectively is of significance to harmonious development of economy, society and environment. However, coal fly ash is mainly composed of mullite and other inert glassy matters with high degree of polymerization and its reactivity is poor. So the fly ash needs to be activated before utilization. This article studied the effect of activation by calcination added with NaOH additives on aluminium extraction. The results showed that the addition of NaOH could improve the aluminium extraction r
Gli stili APA, Harvard, Vancouver, ISO e altri
3

Krampera, František, and Ludvík Beránek. "Kinetics of 1-butanol, di-(1-butyl) ether and 1-butene reactions on aluminas partially deactivated by sodium." Collection of Czechoslovak Chemical Communications 54, no. 11 (1989): 2985–97. http://dx.doi.org/10.1135/cccc19892985.

Testo completo
Abstract (sommario):
The initial rates of six reactions taking place in 1-butanol dehydration at 260 °C in vapour phase were measured on aluminia samples differing in sodium content. The reactants were 1-butanol, di-(1-butyl) ether and 1-butene, resp. The parameters of the best fitting rate equation for each reaction were evaluated. The reaction rates as well as the rate constants and adsorption coefficients of the individual reactions show different sensitivity to datalyst acidity. Therefore, the selectivity of product formation can be influenced by sodium content of the catalyst. The selectivities (with the exce
Gli stili APA, Harvard, Vancouver, ISO e altri
4

Zun, Ro Yong, Helena Davidová, Jaroslava Polednová, Květa Jirátová, and Petr Schneider. "Properties of supported rhodium catalysts for steam dealkylation of toluene." Collection of Czechoslovak Chemical Communications 53, no. 3 (1988): 466–78. http://dx.doi.org/10.1135/cccc19880466.

Testo completo
Abstract (sommario):
The effect of modification of γ-aluminia support by Cr2O3 on physical and catalytical properties of supported rhodium catalysts was investigated. Various techniques were used for characterization of catalysts: porosimetry, diffusion and permeation measurements, determination of surface OH groups, temperature-programmed reduction and catalytic behaviour in steam dealkylation of toluene. Using the transport parameters determined for pelleted catalysts the effect of internal diffusion on the reaction was predicted and compared with experiments.
Gli stili APA, Harvard, Vancouver, ISO e altri
5

Davidová, Helena, and Petr Schneider. "Elimination of dead-volume contributions to moments of chromatographic peaks." Collection of Czechoslovak Chemical Communications 54, no. 11 (1989): 2974–84. http://dx.doi.org/10.1135/cccc19892974.

Testo completo
Abstract (sommario):
two methods for correction of moments of peaks from packed columns were applied to experimental responses of columns packed with porous γ-aluminia in the shape of Rasching rings: 1. substraction of moments for columns of two lengths and 2. application of dead volume corrections obtained by independent measurements. It appears that both methods give identical results. An advantage of the second methods lies in increased accuracy and decreased amount of necessary measurements.
Gli stili APA, Harvard, Vancouver, ISO e altri
6

Kočan, Anton, Alexandr Zemek, and Milan Popl. "Determination of 2,3,7,8-tetrachlorodibenzo-p-dioxin in soil in the presence of large excess of chlorinated hydrocarbons." Collection of Czechoslovak Chemical Communications 56, no. 6 (1991): 1221–27. http://dx.doi.org/10.1135/cccc19911221.

Testo completo
Abstract (sommario):
The paper describes a method of 2,3,7,8-TCDD determination in soils heavily contaminated with organic compounds ( the soil from areas of plants producing pesticides, chlorophenols, etc.). The procedure is based on a sample extraction with a hexane-acetone mixture, cleaning of the extract by washing with potassium hydroxide and sulfuric acid solution and by liquid chromatography on a multilayer modified silica column and aluminia columns, and on GC/MS determination using a labelled internal standard (13C-2,3,7,8-TCDD). The determination limit is 10 ppt and the average recovery 55%.
Gli stili APA, Harvard, Vancouver, ISO e altri
7

Morávek, Vladimír, Miloš Kraus, L. V. Malysheva, E. A. Paukshtis, and E. N. Yurchenko. "IR study of dynamic bahaviour of 2-propanol on alumina." Collection of Czechoslovak Chemical Communications 53, no. 3 (1988): 459–65. http://dx.doi.org/10.1135/cccc19880459.

Testo completo
Abstract (sommario):
Dynamic behavior of surface complexes of 2-propanol on aluminia during adsorption and dehydration was studied using IR spectroscopy. Good agreement was found between the first-order rate constants of alkene formation in pulse-flow experiments and that of disapearance of a reactive surface complex. It was shown that the simple surface alkoxide 2-Pr-O-Al remains on the surface constant temperature, but it can be completely removed by hydrolysis, or by heating up to 200 °C. The surface carboxylates are formed very slowly and are stable even in the presence of water vapour at 300 °C.
Gli stili APA, Harvard, Vancouver, ISO e altri
8

Hanika, Jiří, and Vladimíra Ehlová. "Effect of internal diffusion on kinetics of liquid phase hydrogenation and disproportionation of the cyclohexene on palladium catalysts." Collection of Czechoslovak Chemical Communications 54, no. 11 (1989): 3003–10. http://dx.doi.org/10.1135/cccc19893003.

Testo completo
Abstract (sommario):
Kinetics of the side reactions represented by the system involving hydrogenation and disproportionation of cyclohexene on a commercial catalyst CHEROX 41-00 (3%Pd/C) and on a supported palladium catalyst prepared by impregnation of aluminia with aqueous palladium dichloride (2.15% Pd/γ-Al2O3) have been investigated. As follows from the effectiveness factors of internal diffusion for individual reactions, in the region of internal diffusion, cyclohexene hydrogenation is preferred compared to disproportionation. This finding can be related to the fact that while the rate of disproportionation is
Gli stili APA, Harvard, Vancouver, ISO e altri
9

Chen, Ting Yi, Wen Lu, Wei Liu, Ya Dian Xie, and Ye Qi Fu. "Preparation of Purity Al2O3 for LED Sapphire Materials by Ammonium Aluminum Sulfate and its Performance." Advanced Materials Research 1053 (October 2014): 50–55. http://dx.doi.org/10.4028/www.scientific.net/amr.1053.50.

Testo completo
Abstract (sommario):
The preparation of aluminium sulfate adopting the sulfuric acid heating method with Al (OH)3 as raw material, and join the β complexing agent in aluminium sulfate solution to remove impurities; ammonium aluminum sulfat is prepared by the reaction of the ammonium solution and aluminum sulfate, and purify ammonium aluminum sulfate to get high purity ammonium aluminum sulfate crystals containing crystal water. Purify the crystallization of ammonium aluminum sulfate with containing water treated at 1250 °C for 3 h. Then the high purity alumina was prepared. Break the high purity alumina to press,
Gli stili APA, Harvard, Vancouver, ISO e altri
10

El, Ezzat A., Samih A. Halawy, Mohamed A. Mohamed, and Mohamed I. Zaki. "Surface and Bulk Properties of Alumina Recovered Under Various Conditions from Aluminum Dross Tailings Chemical Waste Versus Bauxite Ore." Journal of Materials Research 17, no. 7 (July 2002): 1721–28. http://dx.doi.org/10.1557/jmr.2002.0255.

Testo completo
Abstract (sommario):
Bauxite ore (industrial raw material) and aluminum dross tailings (a local industrial waste material of the Aluminium Company of Egypt, Egyptalum) were used as two different parent materials to produce alumina. A set of six different preparation methods was applied to aluminum extracts from both materials. X-ray powder diffractometry, thermal and chemical analyses, and surface area and charge measurements were used to characterize the alumina products. The results indicate that catalytic grade, high-purity alumina products of uniform particle sizes could be obtained in large yields, depending
Gli stili APA, Harvard, Vancouver, ISO e altri
11

Hamritha, S., M. Shilpa, M. R. Shivakumar, G. Madhoo, Y. P. Harshini, and Harshith. "Study of Mechanical and Tribological Behavior of Aluminium Metal Matrix Composite Reinforced with Alumina." Materials Science Forum 1019 (January 2021): 44–50. http://dx.doi.org/10.4028/www.scientific.net/msf.1019.44.

Testo completo
Abstract (sommario):
Aluminium alloy has gained importance in the automotive and aerospace industry as it is easily available and easy in manufacturing. In the recent years, materials science has gained huge importance in the field of composites. In the field of composites metal matrix composite is playing a lead role in industrial applications. The unique combinations of properties provided by aluminum and its alloys make aluminum one of the most versatile, economical and attractive metallic materials. To enhance the properties of aluminum, it has been reinforced with alumina, silicon carbide, graphene and others
Gli stili APA, Harvard, Vancouver, ISO e altri
12

Qiu, Baofu, Xiaoming Duan, Zhuo Zhang, Chen Zhao, Bo Niu, Peigang He, Delong Cai, et al. "Microstructural evolution of h-BN matrix composite ceramics with La-Al-Si-O glass phase during hot-pressed sintering." Journal of Advanced Ceramics 10, no. 3 (March 24, 2021): 493–501. http://dx.doi.org/10.1007/s40145-020-0451-0.

Testo completo
Abstract (sommario):
AbstractBN/La-Al-Si-O composite ceramics were fabricated by hot-pressed sintering using hexagonal boron nitride (h-BN), lanthanum oxide (La2O3), aluminia (Al2O3), and amorphous silica (SiO2) as the raw materials. The effects of sintering temperature on microstructural evolution, bulk density, apparent porosity, and mechanical properties of the h-BN composite ceramics were investigated. The results indicated that La-Al-Si-O liquid phase was formed during sintering process, which provided an environment for the growth of h-BN grains. With increasing sintering temperature, the cristobalite phase
Gli stili APA, Harvard, Vancouver, ISO e altri
13

Voon, Chun Hong, M. N. Derman, U. Hashim, and K. L. Foo. "Effect of Anodizing Voltage on the Formation of Porous Anodic Alumina on Al-0.5wt% Mn Alloys." Advanced Materials Research 925 (April 2014): 455–59. http://dx.doi.org/10.4028/www.scientific.net/amr.925.455.

Testo completo
Abstract (sommario):
In this study, the effect of anodizing voltage on the morphologies, pore diameter and interpore distance on the porous anodic alumina formed on aluminium manganese alloy was reported. It was found that the anodizing influenced the morphologies and regularities of porous anodic alumina formed on aluminum-manganese substrate. Well ordered porous anodic alumina was obtained when anodizing voltage were 40 V and 50 V respectively. Disordered porous anodic alumina was formed when anodizing of 30 V and 70 V were applied during the anodizing process. Both pore diameter and interpore distance of porous
Gli stili APA, Harvard, Vancouver, ISO e altri
14

Ruiz, Andrés Felipe, Carlos Javier Peñaranda, Graciela Fuentes, and María Daniela Semprun. "Análisis comparativo de resultados en el uso de la ceniza de bagazo de caña de azúcar como material sustituyente del cemento portland en el concreto." Sostenibilidad, Tecnología y Humanismo 11, no. 2 (July 1, 2020): 8–17. http://dx.doi.org/10.25213/2216-1872.51.

Testo completo
Abstract (sommario):
El presente artículo describe la comparación de resultados de diferentes investigaciones que se han realizado con el uso de la ceniza de bagazo de caña de azúcar como sustituyente del cemento portland en la elaboración del concreto estructural, teniendo como objetivos analizar la actividad puzolánica de las distintas muestras que se tomaron para realizar este articulo y comparar estos resultados con otras investigaciones elaboradas con otros materiales. Teniendo en cuenta aspectos importantes como la contaminación ambiental que genera este residuo, sus cantidades de sílice (SiO2) y aluminia (A
Gli stili APA, Harvard, Vancouver, ISO e altri
15

Suriyana, Dadang, Liliana Sahay, and Okta Meilawaty. "Kelayakan Abu Terbang PLTU Buntoi Sebagai Campuran Beton Geopolimer." Media Ilmiah Teknik Sipil 9, no. 2 (June 1, 2021): 102–8. http://dx.doi.org/10.33084/mits.v9i2.2063.

Testo completo
Abstract (sommario):
The main basic ingredients needed for the manufacture of this geopolymer material are materials that contain a lot of silica and aluminia elements. The 1st stage test was carried out to determine the geopolymer paste with the maximum compressive strength at the ratio of NaOH to Na2SiO3 of 1; 1.5; 2; 2.5. The second stage of testing was carried out using a geopolymer paste with the highest compressive strength, namely the ratio of NaOH to Na2SiO3 of 2.5 with a compressive strength of 22.56 MPa. Based on the results of the compressive strength test, the maximum compressive strength at the age of
Gli stili APA, Harvard, Vancouver, ISO e altri
16

Singh, Shivdev. "Investigating Properties of Hybrid Alumina/ Graphite Aluminium Matrix nano Composites." Journal of Advanced Research in Manufacturing, Material Science & Metallurgical Engineering 06, no. 3&4 (September 9, 2019): 8–20. http://dx.doi.org/10.24321/2393.8315.201902.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
17

Ribeiro, Catarina, Lucinda Gonçalves, and Francisco Delmas. "Highly Reactive Alumina Production from Spent Baths." Materials Science Forum 514-516 (May 2006): 1716–21. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.1716.

Testo completo
Abstract (sommario):
Hydrated alumina Al2O3.3H2O was produced from spent alkaline baths resulting from aluminium transformation industry. Batch and continue laboratory and pilot tests were performed in order to assess technical viability of producing reactive alumina directly from the baths by a precipitation/crystallization process and at the same time of recovering and recycling the associated sodium hydroxide to the extrusion process. The influence of three parameters: time, seed quantity and dilution were evaluated using a statistical method. It was found that time and dilution are the factors which have more
Gli stili APA, Harvard, Vancouver, ISO e altri
18

Sergeyev, D. M., and S. K. Kutshanov. "About resonance tunneling of quasiparticles through nanocontact «aluminum – aluminium oxide – aluminum» at low temperatures." Bulletin of the Karaganda University. "Physics Series" 86, no. 2 (June 30, 2017): 21–29. http://dx.doi.org/10.31489/2017phys2/21-29.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
19

Li, Guang Hui, Wei Cheng, Tao Jiang, Na Sun, and Ling Feng Ai. "Preparation of Porous Silica by Acid Dissociation of Thermally Activated Kaolinite." Advanced Materials Research 284-286 (July 2011): 1381–84. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.1381.

Testo completo
Abstract (sommario):
Preparation of porous silica from thermally activated kaolinite was investigated by using acid dissociation process, and the relationship between structural transformation and acid dissociation properties of aluminium were elucidated. AlVI transfers into AlV and AlIV when kaolinite changes into metakaolinite during thermal activation. AlV is dissoluble in acid, while AlVI, AlIV are difficult to be dissolved into acid, therefore, the coordinations of aluminium affect acid dissociation of alumina markedly. Mesoporous silica is made by acid dissociation alumina of metakaolinite, and the specific
Gli stili APA, Harvard, Vancouver, ISO e altri
20

Choudhary, R. K., V. Kain, and R. C. Hubli. "Formation of alumina-aluminide coatings on ferritic-martensitic T91 steel." Journal of Mining and Metallurgy, Section B: Metallurgy 50, no. 2 (2014): 165–70. http://dx.doi.org/10.2298/jmmb140724022c.

Testo completo
Abstract (sommario):
In this work, alumina-aluminide coatings were formed on ferritic-martensitic T91 steel substrate. First, coatings of aluminum were deposited electrochemically on T91 steel in a room temperature AlCl3-1-ethyl-3-methyl imidazolium chloride ionic liquid, then the obtained coating was subjected to a two stage heat treatment procedure consisting of prolonged heat treatment of the sample in vacuum at 300 ?C followed by oxidative heat treatment in air at 650 ?C for 16 hours. X-ray diffraction measurement of the oxidatively heat treated samples indicated formation of Fe-Al and Cr-Al intermetallics and
Gli stili APA, Harvard, Vancouver, ISO e altri
21

Bocchetta, P., M. Santamaria, and F. Di Quarto. "Anodic Alumina Membranes as Template for the Synthesis of 1-D Metal Oxide and Hydroxide Nanostructures." Advanced Materials Research 38 (March 2008): 213–28. http://dx.doi.org/10.4028/www.scientific.net/amr.38.213.

Testo completo
Abstract (sommario):
Anodic alumina membranes with highly ordered cylindrical pores and tuneable geometry have been prepared (pore diameters=20−200 nm; pore density 1012-1014 pores/m2; thickness: 20-100 mm) by controlling the anodizing process of aluminum in phosphoric, oxalic and sulphuric acid. The influence of different parameters (initial treatment of aluminium surface, composition of electrolyte, temperature and applied potential) on the final characteristics of the membranes have been investigated. The use anodic alumina membranes as template for the electrosynthesis of some metal hydroxides and oxides 1-D n
Gli stili APA, Harvard, Vancouver, ISO e altri
22

Butman, Mikhail F., Nataliya E. Kochkina, Anastasiya E. Mikhaiylova, Nikolaiy L. Ovchinnikov, and Alexander V. Knotko. "BIOTEMPLATED SYNTHESIS OF ALUMINA FIBRES BY CONTROLLED HYDROLYSIS OF SALT PRECURSOR." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 59, no. 5 (July 12, 2018): 47. http://dx.doi.org/10.6060/tcct.20165905.5349.

Testo completo
Abstract (sommario):
Alumina fibres were obrained by impregnation of the cellulose biotemplate with precursor solutions in which the hydrolysis ratio [OH-]/[Al3+] is varied and in which different aluminium oligo- and polycations content. The biotemplates and alumina fibres were studied by X-ray, TG/DSC, electrophoretic light scattering, SEM, and N2 adsorption/desorption. It was shown that the infiltration with the precursor did not affect the cellulose structure. The possibility to vary the surface area, pore size and pore volume of the ceramic fibres by controlled hydrolysis of aluminum was demonstrated.
Gli stili APA, Harvard, Vancouver, ISO e altri
23

Uribe, R., and C. Baudín. "Formación de titanato de aluminio por reacción en estado sólido de alúmina y titania." Boletín de la Sociedad Española de Cerámica y Vidrio 39, no. 2 (April 30, 2000): 221–28. http://dx.doi.org/10.3989/cyv.2000.v39.i2.867.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
24

Sooksaen, Pat, and Pathompong Puathawee. "Conversion of Aluminum Dross Residue into Value-Added Ceramics." Key Engineering Materials 690 (May 2016): 71–75. http://dx.doi.org/10.4028/www.scientific.net/kem.690.71.

Testo completo
Abstract (sommario):
This study utilized aluminum dross residue obtained from secondary process of aluminum production as the main component in the fabrication of ceramic refractories. The amount of residue varied in the range 60-90 wt% and other components in the ceramic formulations were a combination of alumino-silicate based clays. Alpha-alumina, a-Al2O3 was the main crystalline phase found in all sintered samples according to x-ray diffraction analysis. Mullite phase, Al6Si2O13 was also found in all the sintered refractories. It appeared as the main second phase which gave high strength and refractoriness. Al
Gli stili APA, Harvard, Vancouver, ISO e altri
25

Choux, Céline, Sébastien Chevalier, and Yannik Cadoret. "Elaboration of Nickel Aluminide Diffusion Coatings: Application to Oxidation Resistance." Materials Science Forum 595-598 (September 2008): 41–49. http://dx.doi.org/10.4028/www.scientific.net/msf.595-598.41.

Testo completo
Abstract (sommario):
Aluminide diffusion coatings are widely used in aeronautic domain. Nickel based superalloys present good mechanical properties and creep resistance at high temperature but their corrosion resistance is somewhat poor. In order to enhance their lifetime at high temperature, aluminide coatings can be applied on alloy surface. Aluminium present on material surface can form, at high temperature, alumina scale which is a protective oxide scale. In the present study, nickel aluminide coatings were carried out by aluminisation in a single step pack cementation process on nickel based superalloys 600 a
Gli stili APA, Harvard, Vancouver, ISO e altri
26

Valeev, Dmitry, Andrei Shoppert, Alexandra Mikhailova, and Alex Kondratiev. "Acid and Acid-Alkali Treatment Methods of Al-Chloride Solution Obtained by the Leaching of Coal Fly Ash to Produce Sandy Grade Alumina." Metals 10, no. 5 (April 29, 2020): 585. http://dx.doi.org/10.3390/met10050585.

Testo completo
Abstract (sommario):
Sandy grade alumina is a valuable intermediate material that is mainly produced by the Bayer process and used for manufacturing primary metallic aluminum. Coal fly ash is generated in coal-fired power plants as a by-product of coal combustion that consists of submicron ash particles and is considered to be a potentially hazardous technogenic waste. The present paper demonstrates that the Al-chloride solution obtained by leaching coal fly ash can be further processed to obtain sandy grade alumina, which is essentially suitable for metallic aluminum production. The novel process developed in the
Gli stili APA, Harvard, Vancouver, ISO e altri
27

Wittenburg, Christine, and Jean Ellen Duckworth. "Comparison of aluminum toxicology and homeopathic Alumina: a mixed methods study." International Journal of High Dilution Research - ISSN 1982-6206 17, no. 1 (July 22, 2021): 08–09. http://dx.doi.org/10.51910/ijhdr.v17i1.897.

Testo completo
Abstract (sommario):
Toxicology forms part of homeopathy. The founder of homeopathy, Samuel Hahnemann, incorporated many toxicological symptoms in his Materia Medica. These symptoms are part of the information homeopathic practitioners relay on to choose the appropriate medication for their patients. This medication is administered in form of ultra-high dilutions. Hahnemann also developed Materia Medica on the base of provings done with high diluted substances only – simply because these substances did not have a known toxicology at his time. Alumina is one of these substances. Today we possess a reliable toxico
Gli stili APA, Harvard, Vancouver, ISO e altri
28

Kim, Sung Wook, Shinji Iwamoto, and Masashi Inoue. "Pore Structure of Alumina Derived from the Alkyl Derivatives of Boehmite." Advances in Science and Technology 45 (October 2006): 2153–58. http://dx.doi.org/10.4028/www.scientific.net/ast.45.2153.

Testo completo
Abstract (sommario):
Solvothermal reaction of aluminum alkoxides in various alcohols at 250-300 oC yielded alkyl derivatives of boehmite (alkoxyalumoxanes; AlO(OH)1-x(OR)x) in which alkyl groups were incorporated between the boehmite layers through the covalent bondings. In the present work, pore textures of aluminas prepared by calcination of the products were examined. The alumina obtained from the ethyl derivative of boehmite had a broad pore-size distribution, while the pore-size of the alumina obtained from the dodecyl derivative of boehmite distributed in a narrow range in the mesopore region. The mode pore
Gli stili APA, Harvard, Vancouver, ISO e altri
29

Mallik, B., K. Sikdar, and D. Roy. "Synthesis and Characterization of Aluminium Base in situ Metal Matrix Composites by Spark Plasma Sintering." Journal of Materials Science Research 7, no. 1 (December 29, 2017): 14. http://dx.doi.org/10.5539/jmsr.v7n1p14.

Testo completo
Abstract (sommario):
Fe-aluminide and alumina reinforced in-situ aluminium based metal matrix composite was prepared by spark plasma sintering (SPS) of aluminium and nanosized Fe2O3 powder mixture. In-situ reinforcements were formed during SPS by exothermal reaction between aluminium and nano-size Fe2O3 particle. The thermal characteristics of the in-situ reaction were studied by differential scanning calorimetry (DSC). Field Emission Scanning Electron Microscopy (FESEM) along with the Energy Dispersive Spectroscopy (EDS) and X-ray diffraction (XRD) techniques were used to study the microstructural architecture of
Gli stili APA, Harvard, Vancouver, ISO e altri
30

Saidin, Nur Ubaidah, Kuan Ying Kok, Inn Khuan Ng, and Suhaila Hani Ilias. "Fabrication of Nanoporous Aluminum Oxide via a Two-Step Anodisation Process." Advanced Materials Research 620 (December 2012): 464–68. http://dx.doi.org/10.4028/www.scientific.net/amr.620.464.

Testo completo
Abstract (sommario):
In this study, we report the fabrication of nanoporous aluminum oxide film from high purity aluminium foil via a two-step anodisation process controlled by a constant direct current potential ranging from 40 60 V from a DC power supply. The anodisation process was conducted at 20˚C in an electrochemical cell with the Al foil acting as anode, Pt as cathode and an acidic bath as electrolyte. Porous aluminium oxide films of pore diameters ranging between 30 90 nm were successfully fabricated. The morphologies and phase compositions of the anodized porous alumina films were investigated using scan
Gli stili APA, Harvard, Vancouver, ISO e altri
31

Feret, Frank R. "Selected applications of Rietveld-XRD analysis for raw materials of the aluminum industry." Powder Diffraction 28, no. 2 (May 2, 2013): 112–23. http://dx.doi.org/10.1017/s088571561300016x.

Testo completo
Abstract (sommario):
In the last few decades, X-ray diffraction (XRD) systems have been paramount and irreplaceable in controlling bauxite exploration, as well as Bayer and reduction processes. XRD quantitative phase analysis in the aluminum industry witnessed a steady deployment of the Rietveld method, which at present progressively replaces existing methodologies in research and plant laboratories. Rietveld analysis not only helped to surpass traditional XRD calibration methods, it also opened the door for new applications previously not possible. The use of the Rietveld method to characterize selected materials
Gli stili APA, Harvard, Vancouver, ISO e altri
32

Gromov, Nalivaiko, Ambaryan, Vlaskin, Buryakovskaya, Kislenko, Zhuk, et al. "Aluminum–Alumina Composites: Part Ⅰ: Obtaining and Characterization of Powders." Materials 12, no. 19 (September 27, 2019): 3180. http://dx.doi.org/10.3390/ma12193180.

Testo completo
Abstract (sommario):
The process of advanced aluminum-alumina powders production for selective laser melting was studied. The economically effective method of obtaining aluminum–alumina powdery composites for further selective laser melting was comprehensively studied. The aluminum powders with 10–20 wt. % alumina content were obtained by oxidation of aluminum in water. Aluminum oxidation was carried out at ≤200 °C. The oxidized powders were further dried at 120 °C and calcined at 600 °C. Four oxidation modes with different process temperatures (120–200 °C) and pressures (0.15–1.80 MPa) were investigated. Paramete
Gli stili APA, Harvard, Vancouver, ISO e altri
33

Li, Xin Hao, Xing Yong Gu, Wei Xia Dong, and Ting Luo. "In Situ Growth of Mullite Whisker Using Different Aluminium Source and Properties of Mullite-Corundum Lightweight Refractory." Materials Science Forum 848 (March 2016): 328–32. http://dx.doi.org/10.4028/www.scientific.net/msf.848.328.

Testo completo
Abstract (sommario):
In-situ growth of mullite whisker from waste coal gangue and different aluminium source mixtures by dry pressing were investigated aiming at the preparation of mullite - corundum lightweight refractory by controlling mullite whisker precursor pseudo particle size and quantity in corundum matrix. The phase composition and microstructure were studied using X-ray diffraction (XRD) and scanning electron microscope (SEM) techniques. Apparent porosity and bending strength were also measured. The samples exhibited characteristic alumina and mullite phases. The formation mechanism and influence factor
Gli stili APA, Harvard, Vancouver, ISO e altri
34

Chan, K. S., N. S. Cheruvu, and G. R. Leverant. "Coating Life Prediction Under Cyclic Oxidation Conditions." Journal of Engineering for Gas Turbines and Power 120, no. 3 (July 1, 1998): 609–14. http://dx.doi.org/10.1115/1.2818189.

Testo completo
Abstract (sommario):
The hot gas path section components of land based turbines require materials with superior mechanical properties and good hot corrosion and oxidation resistance. These components are generally coated with either a diffusion coating (aluminide or platinum aluminide) or with an overlay coating (MCrAlY) to provide additional hot corrosion and/or oxidation protection. These coatings degrade due to inward and outward diffusion of elements during service. Outward diffusion of aluminum results in formation of a protective oxide layer on the surface. When the protective oxide spalls, Aluminum in the c
Gli stili APA, Harvard, Vancouver, ISO e altri
35

ADIVI, HAMID GHANBARI, IMAN EBRAHIMZADEH, MORTEZA HADI, and MORTEZA TAYEBI. "THE EFFECT OF ALUMINA NANOPARTICLES ADDITION ON HIGH-TEMPERATURE WEAR BEHAVIOR OF INTERMETALLIC IRON ALUMINIDE PRODUCED BY THE SPARK PLASMA SINTERING PROCESS." Surface Review and Letters 27, no. 11 (June 25, 2020): 2050004. http://dx.doi.org/10.1142/s0218625x20500043.

Testo completo
Abstract (sommario):
The pure iron and aluminum powders were milled with 3[Formula: see text]wt.% and 7[Formula: see text]wt.% of alumina nanoparticles in planetary ball mill in order to produce iron aluminide by mechanical alloying technique. The resulting powder mixture was sintered after the formation of iron aluminide by spark plasma sintering (SPS) method to achieve specimens with the highest densification. SPS technique was utilized on specimens under the condition of 40[Formula: see text]MPa pressure at 950∘C for 5[Formula: see text]min. The microstructures were analyzed after sintering using scanning elect
Gli stili APA, Harvard, Vancouver, ISO e altri
36

Sooksaen, Pat, and Pathompong Puathawee. "Properties of Unglazed Ceramics Containing Aluminum Dross as a Major Component." Solid State Phenomena 266 (October 2017): 182–86. http://dx.doi.org/10.4028/www.scientific.net/ssp.266.182.

Testo completo
Abstract (sommario):
Aluminum dross residue is a by-product produced at secondary re-melt plants where aluminum scraps are recycled. In this study, aluminum dross residue was utilized as a major component in the fabrication of unglazed ceramics for wall tile applications. The use of this by-product can reduce the landfill and environmental problems. The amount of aluminum dross residue used in the ceramic compositions varied in the range 50-90 wt.%. Other components utilized in the ceramic compositions included recycled glass alumino-silicate based clays. Firing was carried out between 1140 and 1200°C with 4h hold
Gli stili APA, Harvard, Vancouver, ISO e altri
37

Kobayashi, Yoshio, Yusuke Mabuchi, Masachika Hama, Katsumi Yamamura, Yusuke Yasuda, and Toshiaki Morita. "Effects of Seeding with Nanocrystallites and Addition of Inorganic Alumina Sol on Crystallization of Alkoxide Alumina Gel." Key Engineering Materials 697 (July 2016): 12–17. http://dx.doi.org/10.4028/www.scientific.net/kem.697.12.

Testo completo
Abstract (sommario):
This paper reports a method for producing α-Al2O3 at low temperature from aluminum alkoxide using a combination of seeding of α-Al2O3 nanocryatallites and adding of inorganic alumina sol. An alkoxide alumina sol was obtained by hydrolyzing aluminum isopropoxide in water at 80°C and then peptizing the hydrolyzed aluminum isopropoxide using acetic acid at 80°C. An inorganic alumina sol was obtained by producing aluminum compound with a homogeneous precipitation method using aluminum nitrate and urea in aqueous solution and then peptizing the aluminum compound using acetic acid at room temperatur
Gli stili APA, Harvard, Vancouver, ISO e altri
38

Nor, Nor Hafiez Mohamad, Ismail Muhammad Hussain, Nur Atikah Abu Kasim, Wan Dung Teng, and M. K. Idham. "Sintering of Alumina-AIN System for Heat Sink." Applied Mechanics and Materials 465-466 (December 2013): 76–80. http://dx.doi.org/10.4028/www.scientific.net/amm.465-466.76.

Testo completo
Abstract (sommario):
Aluminium alloys is widely applied in heat sink but its application of heat absorption is still unsatisfied. While, Aluminum Nitride (AIN) was discovered as another option for heat sink application because of its great thermal conductivity and it also has high electrical conductivity at high temperature. Thus, the mechanical and chemical properties of a sintered mixed powder of Alumina and AIN are investigated experimentally. There are five different compositions of mixed powder of Alumina-AIN and sintered at three different sintering temperatures which are 1400°C, 1500°C and 1600°C. As applyi
Gli stili APA, Harvard, Vancouver, ISO e altri
39

Jabbarnia, A., and Saeed Heshmati-Manesh. "Effect of Milling Time on Crystallite Size and Morphology of Nickel Aluminde Based Composite Powder Prepared by Mechanical Assisted SHS Route." Advanced Materials Research 83-86 (December 2009): 940–44. http://dx.doi.org/10.4028/www.scientific.net/amr.83-86.940.

Testo completo
Abstract (sommario):
Mechanical alloying technique was used to produce an intermetallic based composite powder. Mechanical activation of aluminum and nickel oxide powder mixture using a high energy ball mill resulted in a self-propagating high temperature synthesis through which nickel oxide was reduced by metallic aluminum and produced nickel aluminide and alumina composite powder. Effect of milling time on crystallite sizes of the product phases was investigated. The synthesized product was characterized by scanning electron microscope and X-ray diffraction. It was shown that increased milling time resulted in c
Gli stili APA, Harvard, Vancouver, ISO e altri
40

Abdulkader, Niveen J., Payman Sahbah Ahmed, and Mohammed Mahdy Jabar. "Study Corrosion Behavior of Alumina Particulate / (AA6061) Aluminum Metal Matrix Composite In Marine Environment." Sulaimani Journal for Engineering Sciences 3, no. 3 (April 1, 2016): 30–36. http://dx.doi.org/10.17656/sjes.10034.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
41

Yin, Jian Jun, Min Li, Zhong Dong Zhang, Dong Wang, Shuai Shao, and Xiong Hou Gao. "The Preparation of High Alumina Content Alumina Sol." Applied Mechanics and Materials 528 (February 2014): 118–26. http://dx.doi.org/10.4028/www.scientific.net/amm.528.118.

Testo completo
Abstract (sommario):
The alumina sol with high content of Al2O3 was prepared by peptizing aluminum hydroxide powder. The properties of the alumina sol were characterized by Fourier transform-infrared (FT-IR) spectrum, zeta potential analyzer, X-ray diffraction (XRD) and Transmission electron microscope (TEM). The results show that the sol with high content of Al2O3 can be easily prepared by peptizing the soluble aluminum hydroxide powder, the smaller of the size of aluminum hydroxide powder, the higher of the aluminum content of the alumina sol. Two-step peptization process is optimum, the effect of peptization al
Gli stili APA, Harvard, Vancouver, ISO e altri
42

Takano, H., Takafumi Kusunose, Tohru Sekino, Rajagopalan Ramaseshan, and Koichi Niihara. "Development of Low Machining Cost Materials by Using Aluminum Borate." Key Engineering Materials 317-318 (August 2006): 335–38. http://dx.doi.org/10.4028/www.scientific.net/kem.317-318.335.

Testo completo
Abstract (sommario):
6061 aluminum alloy composite reinforced with α-alumina and aluminum borate is fabricated by casting method. The above mentioned composite has been compared to a similar composite without aluminum borate reinforcement for their machinability. The aluminum borate filler was controlled up to (2.5, 5.0 and 30vol %) on the surface of α-alumina. The reaction zone between alumina and the matrix in both the systems are analyzed with the help of TEM micrographs as well as X-ray diffraction profiles. At the reaction zone between alumina and the aluminum alloys, some spinel-like compounds (MgAl2O4) are
Gli stili APA, Harvard, Vancouver, ISO e altri
43

Sjaifudin, Achmad. "FABRIKASI DAN KARAKTERISASI BEBERAPA PADUAN ALUMINIUM - ALUMINA PARTIKULAT KOMPOSIT MELALUI PENGECORAN." Jurnal Teknologi Bahan dan Barang Teknik 2, no. 2 (December 31, 2012): 51. http://dx.doi.org/10.37209/jtbbt.v2i2.23.

Testo completo
Abstract (sommario):
Paduan aluminium-partikulat keramik komposit meningkatkan sifat mekanik dan fisik paduan aluminium tersebut. Namun kesulitan terbesar adalah masalah mampu membasahi (wettability) dari matriks aluminium (Al) terhadap partikel keramik dan reaksi antar muka antara maktriks dengan partikel. Oleh karena itu telah dilakukan percobaan pembuatan paduan aluminium yang diperkuat oleh partikulat alumina (alumina particulate reinforced aluminium alloys) melalui proses pengecoran konvensional untuk mengetahui dan dikarekterisasi dengan Scanning Electron Microscope (SEM). Prosesnya adalah dengan cara mencam
Gli stili APA, Harvard, Vancouver, ISO e altri
44

Wu, Dao Ji, Ding Li, Li Rui Weng, Wei Jie Zheng, and Xiao Yan Qu. "The Regenerative Experiment of Activated Alumina Granules." Advanced Materials Research 201-203 (February 2011): 2649–52. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.2649.

Testo completo
Abstract (sommario):
Activated alumina granules is a primary sorption media . The intention of this experiment is to get out of the difference between the different regenerate medias, caustic soda and alumina sulfate . Experimental result shows the renewal adsorption capacity of activated alumina using caustic soda regenerate is more than using aluminum sulfate .Under the same experiment condition ,aluminum sulfate can regain 13.27mg/g adsorption capacity while using 0.8 per cent caustic soda to regenerate alumina and 5.36mg/g using 4 per cent aluminum sulfate .The intensity of activated alumina granules reduces w
Gli stili APA, Harvard, Vancouver, ISO e altri
45

Galusková, Dagmar, Miroslav Hnatko, Jozef Kraxner, Dušan Galusek, and Pavol Šajgalík. "Influence of Calcium Addition on the Chemical Durability of the Model Alumino-Silicate Glasses in Aqueous Solutions." Key Engineering Materials 512-515 (June 2012): 1009–14. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.1009.

Testo completo
Abstract (sommario):
The corrosion resistance of liquid phase sintered (LPS) alumina ceramics in aqueous environments strongly depends on composition and chemistry of grain boundary glass formed during sintering. The chemical durability of model alumino-silicate glasses with various contents of CaO in aqueous solutions was therefore evaluated. Prepared glasses were corroded under hydrothermal conditions in deionized water under static conditions. The examination of surface morphology of corroded specimens after the contact with deionized water, together with the analysis of corrosion solution provided information
Gli stili APA, Harvard, Vancouver, ISO e altri
46

Becker, Lillian C., Ivan Boyer, Wilma F. Bergfeld, Donald V. Belsito, Ronald A. Hill, Curtis D. Klaassen, Daniel C. Liebler, et al. "Safety Assessment of Alumina and Aluminum Hydroxide as Used in Cosmetics." International Journal of Toxicology 35, no. 3_suppl (November 2016): 16S—33S. http://dx.doi.org/10.1177/1091581816677948.

Testo completo
Abstract (sommario):
This is a safety assessment of alumina and aluminum hydroxide as used in cosmetics. Alumina functions as an abrasive, absorbent, anticaking agent, bulking agent, and opacifying agent. Aluminum hydroxide functions as a buffering agent, corrosion inhibitor, and pH adjuster. The Food and Drug Administration (FDA) evaluated the safe use of alumina in several medical devices and aluminum hydroxide in over-the-counter drugs, which included a review of human and animal safety data. The Cosmetic Ingredient Review (CIR) Expert Panel considered the FDA evaluations as part of the basis for determining th
Gli stili APA, Harvard, Vancouver, ISO e altri
47

Padilla, Isabel, Aurora López-Delgado, Sol López-Andrés, Marta Álvarez, Roberto Galindo, and Alfonso J. Vazquez-Vaamonde. "The Application of Thermal Solar Energy to High Temperature Processes: Case Study of the Synthesis of Alumina from Boehmite." Scientific World Journal 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/825745.

Testo completo
Abstract (sommario):
The aim of this paper is to evaluate the feasibility of obtaining alumina from boehmite using a free, clean, and unlimited power source as the solar energy. Boehmite was obtained by hydrothermal treatment of a hazardous waste coming from aluminum slag milling. The waste is considered as a hazardous substance because of it releasing toxic gases (hydrogen, ammonia, methane, and hydrogen sulfide) in the presence of water. The as-obtained boehmite was transformed into alumina, in air atmosphere, using a solar energy concentrator (Fresnel lens). The solar installation provides a power density of 26
Gli stili APA, Harvard, Vancouver, ISO e altri
48

Zhou, Tian Pei. "Application of Intelligent Characteristic Model in Alumina Concentration Control System." Advanced Materials Research 328-330 (September 2011): 1837–40. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.1837.

Testo completo
Abstract (sommario):
In electrolytic aluminum production processing, the measurement and control of alumina density is one of the three most important control aims. However, due to alumina density can not be measured directly and continuously online, and electrolytic aluminum production process is nonlinear, time-varying and large delay, which can not be described through the mathematical analysis model. Therefore, efficient and reliable development of alumina density control method is very important. In this paper, alumina density is controlled by single neural adaptive PID controller in electrolytic aluminum pro
Gli stili APA, Harvard, Vancouver, ISO e altri
49

Senthilkumar, R., N. Arunkumar, and M. Manzoor Hussian. "Effects of Micro and Nano-Size Al2O3 Particle Reinforcement on Mechanical Behaviour of Extruded Aluminum Alloy Matrix Composite." Applied Mechanics and Materials 787 (August 2015): 617–21. http://dx.doi.org/10.4028/www.scientific.net/amm.787.617.

Testo completo
Abstract (sommario):
Aluminum alloy (AA2014) matrix composites reinforced by different weight percentage of aluminum oxide (Al2O3) in micro and nano sizes were fabricated through powder metallurgy route followed by hot extrusion process. Seven different aluminium composites with varying percentages of nano and micron sized alumina particles varying from 1% to 10% were evaluated in addition to monolithic alloy. The microstructure of nano-composite and monolithic alloys were examined by optical microscope and scanning electron microscope (SEM) equipped with an energy dispersive X-ray analysis (EDAX). In addition, th
Gli stili APA, Harvard, Vancouver, ISO e altri
50

Cao, Hui Qin, Ji Luo, and Wei Wei Yang. "Preparation of Dispersion Strengthened Aluminum Alloy by High Energy Ball Milling." Advanced Materials Research 602-604 (December 2012): 598–601. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.598.

Testo completo
Abstract (sommario):
In order to develop a high-strength aluminum alloy, alumina dispersion strengthened aluminum alloy was prepared by high energy ball milling on 2024 aluminum alloy powder in ethanol. The microstructure, particle size and distribution of the Al2O3 particles in the alloy were analyzed by FE-SEM; the mechanical properties were investigated. Results showed that alumina dispersion strengthened aluminum alloy was prepared successfully by high energy ball milling, the Al2O3 particles of several tens of nm in diameter were homogeneously distributed in the matrix grain and the spatial distance between p
Gli stili APA, Harvard, Vancouver, ISO e altri
Ti possono interessare anche gli elenchi di altri tipi di fonti sul tema "Aluminia":
Tesi Libri
Offriamo sconti su tutti i piani premium per gli autori le cui opere sono incluse in raccolte letterarie tematiche. Contattaci per ottenere un codice promozionale unico!

Vai alla bibliografia