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Journal articles on the topic 'Ceramic shell'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Balagansky, Igor, Alexey Vinogradov, Lev Merzhievsky, Alexander Matrosov, and Ivan Stadnichenko. "Analysis of Shell Material Influence on Detonation Process in High Explosive Charge." Key Engineering Materials 715 (September 2016): 27–32. http://dx.doi.org/10.4028/www.scientific.net/kem.715.27.

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The influence of the shell material (copper and silicon carbide) on the detonation process in cylindrical high explosive charge is experimentally and numerically investigated. We observed the significant differences of wave pictures in the detonation products and in the shells, which were due to differences in the sound velocities in the shells and rapid destruction of the ceramic shell under explosion loading. The specific features of a wave picture at the interface HE/ceramics due to desensitization of explosive under loading by an advanced wave in the shell were detected. Those features lea

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2

Stochero, Naiane Paiva, Elisângela Guzi de Moraes, and Antonio Pedro Novaes de Oliveira. "Cellular Ceramics Produced from Ceramic Shell: Processing and Characterization." Materials Research 20, suppl 2 (2017): 549–54. http://dx.doi.org/10.1590/1980-5373-mr-2016-1093.

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3

Duarte, Teresa P., Rui J. L. Neto, Rui Félix, and F. Jorge Lino. "Optimization of Ceramic Shells for Contact with Reactive Alloys." Materials Science Forum 587-588 (June 2008): 157–61. http://dx.doi.org/10.4028/www.scientific.net/msf.587-588.157.

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Companies are continuously under pressure to innovate their products and processes. In Portugal, there are already several examples of enterprises that have chosen research groups, associated to universities, to straighten collaboration seeking the development of new materials and advanced technological processes, to produce components with complex shapes, high surface quality, and others, at low cost, for continuously more demanding applications. Unfortunately, these cases are still a very small number, and many efforts have to be done to enlarge the collaboration university-companies. Ti and

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4

Małek, Marcin, Paweł Wiśniewski, Hubert Matysiak, and Krzysztof J. Kurzydłowski. "Technological properties of ceramic slurries based on aluminium III oxide for ceramic shell moulds fabrication." Mechanik, no. 2 (February 2015): 127/235–127/242. http://dx.doi.org/10.17814/mechanik.2015.2.91.

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5

Lee, Wei-Hao, Yi-Fong Wu, Yung-Chin Ding, and Ta-Wui Cheng. "Fabrication of Ceramic Moulds Using Recycled Shell Powder and Sand with Geopolymer Technology in Investment Casting." Applied Sciences 10, no. 13 (2020): 4577. http://dx.doi.org/10.3390/app10134577.

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Lost-wax casting, also called precision casting, is the process of casting a duplicate metal sculpture cast an original sculpture. The ceramic shell mould used in lost-wax casting usually consists of several layers formed with fine zircon and granular mullite particles using silica gel as a binder. However, it is a complicated and time-consuming process. Large amounts of waste moulds that need to be disposed and recycled become an environmental concern. In this study, waste shell sand from the recycled mould and calcium carbonate/metakaolin were used as raw materials to prepare geopolymer slur

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Harun, Zawati, N. H. Kamarudin, and H. Mohd Taib. "Effect of Rice Husk on Fired Ceramic Shell Strength." Advanced Materials Research 795 (September 2013): 732–37. http://dx.doi.org/10.4028/www.scientific.net/amr.795.732.

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In recent years, ceramic shell mould for investment casting process is often associated to defects due to its brittle properties. The defects would originate from cracking mechanism yielded from the ceramic brittleness. In this work, the improvement of ceramic shell mould by reinforcement technique was studied and analyzed. Rice husk consisting high percentage of silica content with the ability to withstand high temperature during casting process was studied as the reinforcing component as to impede cracking mechanism. Higher Modulus of Rupture (MOR) value of ceramic shell reinforced by rice h

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Harun, Zawati, Noor Hasliza Kamarudin, and Muhamad Zaini Yunos. "Permeable Rice Husk Fibre Shell Mould System." Applied Mechanics and Materials 372 (August 2013): 331–35. http://dx.doi.org/10.4028/www.scientific.net/amm.372.331.

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Basically, permeability of ceramic shell mould system play an important role in minimizing the casting defects in most investment casting shell. The mould has to be sufficiently permeable to obtain complete mould filling during casting process. Mould fill can be improved by increasing the open porosity that definitely will increase permeability ceramic shell mould. The elimination of rice husk volatile elements has contributed to the increment of pore structure that provides a great deal of connected pathways through the ceramic shell which directly will increase the permeability of the cerami

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8

Wang and Guo. "Re-Melting Nb–Si-Based Ultrahigh-Temperature Alloys in Ceramic Mold Shells." Metals 9, no. 7 (2019): 721. http://dx.doi.org/10.3390/met9070721.

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In furnaces with different heating elements, Nb–Si based ultrahigh-temperature alloy rods were re-melted in pure yttria mold shells and zirconia face-coat mold shells at 1850 °C for 30 min. The results evidenced that in the furnace with a tungsten heating element, the microstructure of the re-melted alloy became coarser, and the composition varied depending on the type of mold shell. Although the interface reaction layer between the re-melted alloy and the zirconia face-coat mold shell was much thicker, the deformability of the mold shell and the sand burning phenomenon of the alloy inside it

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9

Teltser, Patrice A. "An Analytic Strategy for Studying Assemblage-Scale Ceramic Variation: A Case Study from Southeast Missouri." American Antiquity 58, no. 3 (1993): 530–43. http://dx.doi.org/10.2307/282112.

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For ceramic assemblages composed exclusively of sherds, inferences at the scale of artifact are often problematic. Drawing on information provided by experimental studies, observations can be made such that technology and use are expressed at the scale of assemblage. A simple classification is used to describe variation in paste composition for an assemblage of shell-tempered ceramics from southeast Missouri. Using these classes as a set of analytic units, variables reflecting on technology and use are examined. The analytic results suggest that while some coarse-shell ceramics may have been u

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10

Huang, Pengpeng, Gang Lu, Qingsong Yan, and Pu Mao. "Effect of Ceramic and Nylon Fiber Content on Composite Silica Sol Slurry Properties and Bending Strength of Investment Casting Shell." Materials 12, no. 17 (2019): 2788. http://dx.doi.org/10.3390/ma12172788.

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In order to improve the performance of the investment casting shell, ceramic and nylon fiber was added to the silica sol slurry to study the effect of ceramic and nylon fiber on the liquidity of the silica sol slurry and the bending strength of the investment casting shell. Meanwhile, the fracture surface of shell sample was observed by SEM. The experiment results indicate that the movement viscosity of slurry increases with ceramic and nylon fiber content, increasing from 0 to 0.75 wt.%. The movement viscosity of ceramic fiber composite slurry is higher than nylon fiber composite slurry. The

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11

Zhigang, Zhou, Zhang Weilong, Wu Yugong, and Zhang Ruitao. "Grain core-grain shell structure in ceramic-ceramic dielectrics." Ferroelectrics 101, no. 1 (1990): 55–60. http://dx.doi.org/10.1080/00150199008016500.

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12

Harun, Zawati, Nazri Mohd Nawi, Mohd Faizal Batcha, and David Gethin. "Modeling of Layering Ceramic Shell Mould." Applied Mechanics and Materials 232 (November 2012): 548–52. http://dx.doi.org/10.4028/www.scientific.net/amm.232.548.

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This paper presents the modeling the drying process of shell mould layering process for the ceramic shell mould fabrication process. As this process involves the repeated drying of the different wetted/saturated layers, therefore modeling of this phenomena involve a sequent approach to tackle the whole development of shell mould layering process. In this work an Ab-Initia approach was selected as the best simulation technique to map the drying mechanism. Saturation or moisture content was selected as the best parameter that will represent the drying of layering process. Using FEM with quadrila

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13

Stoneham, Marshall, John Harding, and Tony Harker. "The Shell Model and Interatomic Potentials for Ceramics." MRS Bulletin 21, no. 2 (1996): 29–35. http://dx.doi.org/10.1557/s0883769400046273.

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In a classification of solids according to their bonding character (into metals, ceramics and glasses, polymers, and semiconductors), the ceramic class includes an enormous range of industrially important materials. From the archetypal ionic solids through oxides to silicates, and to covalently bonded materials such as SiC, they exhibit a rich variety of structures and properties. They occur as structural materials, either on their own or as composites such as SiC/Al2O3. They are important functional materials, such as fast-ion conductors as electrolytes in fuel cells (for example ZrO2/Y2O3 fo

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14

Vogel, Danny, Christian Schulze, Henry Dempwolf, Daniel Kluess, and Rainer Bader. "Biomechanical behavior of modular acetabular cups made of poly-ether-ether-ketone: A finite element study." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 232, no. 10 (2018): 1030–38. http://dx.doi.org/10.1177/0954411918797600.

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After total hip arthroplasty, stress-shielding is a potential risk factor for aseptic loosening of acetabular cups made of metals. This might be avoided by the use of acetabular cups made of implant materials with lower stiffness. The purpose of this numerical study was to determine whether a modular acetabular cup with a shell made of poly-ether-ether-ketone or poly-ether-ether-ketone reinforced with carbon fibers might be an alternative to conventional metallic shells. Therefore, the press-fit implantation of modular cups with shells made of different materials (Ti6Al4V, poly-ether-ether-ket

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15

Harun, Zawati, Noor Hasliza Kamarudin, Mustaffa Ibrahim, Maizlinda Izwana Idris, and Sufizar Ahmad. "Reinforced Green Ceramic Shell Mould for Investment Casting Process." Advanced Materials Research 1087 (February 2015): 415–19. http://dx.doi.org/10.4028/www.scientific.net/amr.1087.415.

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The development of thin ceramic shell mould in investment casting process is very crucial as this mould inherited brittle property and highly exposed to the cracking mechanism. The slurry composition produces green (unfired) ceramic shell mould which low in strength and easily crack or fail during wax removal or handling process. By strengthening of this brittle ceramic shell mould via reinforcement technique can enhance the strength of green shell mould body. In this work, the presence of the treated rice husk fibre have toughened the green shell mould by creating mechanical interlocking bond

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16

Feathers, James K. "Problems of Ceramic Chronology in the Southeast: Does Shell-Tempered Pottery Appear Earlier than We Think?" American Antiquity 74, no. 1 (2009): 113–42. http://dx.doi.org/10.1017/s0002731600047533.

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The chronology of shell-tempered pottery in the eastern United States is poorly understood, preventing any resolution to the question of how this pottery came to dominate ceramic assemblages in the late prehistoric period. Part of the problem lies in traditional dating methods that either provide only average dates that suppress variation or address depositional rather than manufacturing events. Better resolution can be obtained by dating individual artifacts. Luminescence dates for 67 ceramics from several sites in the mid-South show variation in age of ceramics from a single assemblage, stro

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17

Chen, Bin, Jing Hong Fan, J. Wang, X. Peng, and Xiao Lin Wu. "Research of Nanostructure of Bivalva Shell." Journal of Metastable and Nanocrystalline Materials 23 (January 2005): 83–86. http://dx.doi.org/10.4028/www.scientific.net/jmnm.23.83.

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Molluscan shells is a natural ceramic composite with excellent fracture strength and fracture toughness, which are attributed to their unique microstructures. Sanning electron microscope (SEM) observation on Bivalva shell showed that the shell consists of laminated aragonite and organic layers. These aragonite and organic layers are provided with the scale and characteristics of nanometer. The effect and function of these nanometer structures were analyzed based on Griffith criterion and energy-dissipation idea. The higher fracture strength and fracture roughness of bionanocomposite-molluscan

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18

Fomina, O. A., and А. Yu Stolboushkin. "Firing of Cellular Ceramics from Granulated Foam-Glass." Materials Science Forum 992 (May 2020): 265–70. http://dx.doi.org/10.4028/www.scientific.net/msf.992.265.

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It has been presented the study results of the firing process of cellular ceramics from granulated foam glass. The chemical, mineral and granulometric compositions of the raw materials are given. It has been shown the characteristic of ceramic-technological properties of raw materials. The samples were burned from the granulated mixture in the temperature range of 850-1000 ° C. It has been established the change dependence in the physicomechanical properties of cellular ceramic samples on the temperature and firing duration. The results of the study of the macro-and microstructure of cellular

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19

Boehm, Anna K., Emanuel Ionescu, Marcus Koch, and Markus Gallei. "Combining Soft Polysilazanes with Melt-Shear Organization of Core–Shell Particles: On the Road to Polymer-Templated Porous Ceramics." Molecules 24, no. 19 (2019): 3553. http://dx.doi.org/10.3390/molecules24193553.

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The preparation of ordered macroporous SiCN ceramics has attracted significant interest and is an attractive area for various applications, e.g., in the fields of catalysis, gas adsorption, or membranes. Non-oxidic ceramics, such as SiCN, own a great stability based on the covalent bonds between the containing elements, which leads to interesting properties concerning resistance and stability at high temperature. Their peculiar properties have become more and more important for a manifold of applications, like catalysis or separation processes, at high temperatures. Within this work, a feasibl

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20

Chabera, P., A. Boczkowska, A. Morka, T. Niezgoda, A. Oziębło, and A. Witek. "Numerical and experimental study of armour system consisted of ceramic and ceramic- elastomer composites." Bulletin of the Polish Academy of Sciences Technical Sciences 62, no. 4 (2014): 853–59. http://dx.doi.org/10.2478/bpasts-2014-0094.

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Abstract The paper presents numerical and experimental results in the study of composite armour systems for ballistic protection. The modelling of protective structures and simulation methods of experiment as well as the finite elements method were implemented in LS DYNA software. Three armour systems with different thickness of layers were analyzed. Discretization for each option was built with three dimensional elements guaranteeing satisfactory accuracy of the calculations. Two selected armour configurations have been ballistically tested using the armour piercing (AP) 7.62 mm calibre. The

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21

Bich, Dao Huy, Vu Hoai Nam, and Nguyen Thi Phuong. "Nonlinear postbuckling of eccentrically stiffened functionally graded plates and shallow shells." Vietnam Journal of Mechanics 33, no. 3 (2011): 131–47. http://dx.doi.org/10.15625/0866-7136/33/3/207.

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The paper deals with the formulation of governing equations of eccentrically stiffened functionally graded plates and shallow shells based upon the classical shell theory and the smeared stiffeners technique taking into account geometrical nonlinearity in Von Karman-Donnell sense. Material properties are assumed to be temperature-independent and graded in the thickness direction according to a simple power law distribution in terms of the volume fraction of constituents. The shells are reinforced by eccentrically longitudinal and transversal stiffeners made of full metal or full ceramic depend

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22

Hasheminejad, S. M., and M. Komeili. "Dynamic response of a thick functionally graded material tube under a moving load." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 221, no. 12 (2007): 1545–54. http://dx.doi.org/10.1243/09544062jmes732.

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An analysis for axisymmetric steady-state response of an arbitrarily thick, isotropic, and functionally graded circular cylindrical shell of infinite length subjected to an axially moving normal ring load is presented. The mechanical properties of the graded shell are assumed to vary smoothly and continuously with the change of volume concentrations of the constituting materials across the thickness of the shell according to a power law distribution. The problem solution is derived by using Fourier transformation with respect to a moving reference frame in conjunction with the T-matrix solutio

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23

Zhu, Ji Hong, Wei Hong Zhang, and Xiao Jun Gu. "On the Topology Optimization Design for the Stereolithography Based Investment Casting Model." Advanced Materials Research 139-141 (October 2010): 1464–67. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.1464.

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The purpose of this paper is to avoid the crack problem of the ceramic shell during the burnout procedure of the rapid investment casting using stereolithograghy (SLA) model. Since the coefficient of thermal expansion of the SLA model is much higher than the coefficient of the ceramic shell, the internal structural patterns have to be properly designed to reduce the stress level in the ceramic shell. A topology optimization method is proposed here to find better microstructure designs to satisfy both the strength of the ceramic shell and the stiffness of the SLA model itself. Taking the arraye

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24

Rick, Torben C., and Darrin L. Lowery. "Accelerator Mass Spectrometry14C Dating and the Antiquity of Shell-Tempered Ceramics from the Chesapeake Bay and Middle Atlantic." American Antiquity 78, no. 3 (2013): 570–79. http://dx.doi.org/10.7183/0002-7316.78.3.570.

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AbstractCeramics typologies have long been used to build artifact, site, and regional chronologies. Direct accelerator mass spectrometry (AMS)14C dating of shell-tempered ceramics offers a promising tool for updating and improving these chronologies. Few studies have14C dated shell fragments from shell-tempered pottery, however, and questions remain about potential biases from “old shell,” the reservoir effect, and other variables. Forty-five direct AMS14C assays on shell-tempered pottery and associated shell, charcoal, and bone from nine archaeological sites in Virginia and Maryland provide a

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25

Zhu, Ji-Hong, Qing Li, and Wei-Hong Zhang. "The periodic resin configuration design for ceramic-resin composite structure using topology optimization." International Journal for Simulation and Multidisciplinary Design Optimization 5 (2014): A12. http://dx.doi.org/10.1051/smdo/2013017.

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The ceramic-resin composite structure has broad prospects in many fields like rapid casting and thermal protection. Due to the coefficient of thermal expansion (CTE) of resin is about 10 times higher than that of ceramic, the excessive thermal expansion of the resin pattern will lead to the undesirable crack of the ceramic shell during the heating procedure. The proposed approach is to find a reasonable resin configuration minimizing the thermal stress in the ceramic shell. Simultaneously, the mechanical stiffness of the whole structure should be maintained at a certain level to resist the pre

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Szymanska, Joanna, Pawel Wisniewski, Marcin Male, and Jaroslaw Mizera. "Rheological properties of alumina ceramic slurries for ceramic shell-mould fabrication." Materiali in tehnologije 50, no. 5 (2016): 735–38. http://dx.doi.org/10.17222/mit.2015.188.

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27

Stolboushkin, Andrey, Vadim Syromyasov, Vladimir Vereschagin, and Oksana Fomina. "Macromodel of interfacial transition layer in ceramic matrix composites." MATEC Web of Conferences 143 (2018): 02003. http://dx.doi.org/10.1051/matecconf/201814302003.

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The purpose of the study is to create a macromodel of interfacial transition layer in ceramic matrix composites. Chemical and mineralogical compositions were investigated by means of X-ray fluorescence analysis and X-ray diffractometry, ceramic and technological properties of raw materials were defined using standard test methods for argillaceous raw materials. Phase composition and structure of ceramic specimens were studied using a complex of modern physico-chemical analysis methods. The layer-by-layer model of shell-core transition in ceramic matrix material was suggested. Boundary conditio

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28

Wang, Li Li, Jian Sheng Yao, Guo Hong Gu, Xin Li, Shu Xin Niu, and Zeng Li Wang. "Interface Reaction between Directional Solidified Superalloy DZ40M and Ceramic Mould." Materials Science Forum 1035 (June 22, 2021): 235–42. http://dx.doi.org/10.4028/www.scientific.net/msf.1035.235.

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The interfaces between DZ40M directional solidified superalloy and ceramic mould (SiO2-base core and Al2O3-base shell) was studied by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results showed that there was a serious interface reaction between DZ40M and ceramic cores，which resulted in many reaction pits (~100μm deep), Si rich residue alloys and Zr rich subglobose oxides on the inner surface. And the interface reaction between DZ40M and ceramic shell induced a ~50μm of pink sand burning layer. The thermal analysis showed that the reactions between DZ40M and

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29

Lynott, Mark J., Hector Neff, James E. Price, James W. Cogswell, and Michael D. Glascock. "Inferences about Prehistoric Ceramics and People in Southeast Missouri: Results of Ceramic Compositional Analysis." American Antiquity 65, no. 1 (2000): 103–26. http://dx.doi.org/10.2307/2694810.

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AbstractCeramic compositional studies using Instrument Neutron Activation Analysis indicates that it is possible to distinguish between ceramics manufactured from clays originating in the Central Mississippi River valley and clays originating in the Eastern Ozarks. The study also documents that shell-tempered ceramics were being made from Eastern Ozark clays during the period A.D. 700 to A.D. 1000. Shell-tempered ceramics made from clays originating in the Western Lowlands also are found at sites in the Eastern Ozarks during this time period, providing evidence for interaction between the East

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30

Li, Q., Ji Hong Zhu, Y. H. Zhang, and W. H. Zhang. "The Topology Optimization of Ceramic-Resin Composite Structure under Thermal and Mechanical Loads." Applied Mechanics and Materials 341-342 (July 2013): 124–28. http://dx.doi.org/10.4028/www.scientific.net/amm.341-342.124.

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The ceramic-resin composite structure is generally used as the investment casting pattern. Due to the coefficient of thermal expansion (CTE) of resin is higher than that of ceramic, the thermal expansion of the resin pattern will lead to the crack of the ceramic shell during the burnout procedure. Simultaneously, the stiffness of the whole structure should be maintained at a certain level. In this paper, topology optimizations with respect to the cavity configuration of the resin pattern were developed to find out the optimal designs. A method involves the assist element was also introduced to

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31

Vogel, Danny, Matthias Klimek, Michael Saemann, and Rainer Bader. "Influence of the Acetabular Cup Material on the Shell Deformation and Strain Distribution in the Adjacent Bone—A Finite Element Analysis." Materials 13, no. 6 (2020): 1372. http://dx.doi.org/10.3390/ma13061372.

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In total hip arthroplasty, excessive acetabular cup deformations and altered strain distribution in the adjacent bone are potential risk factors for implant loosening. Materials with reduced stiffness might alter the strain distribution less, whereas shell and liner deformations might increase. The purpose of our current computational study was to evaluate whether carbon fiber-reinforced poly-ether-ether-ketones with a Young´s modulus of 15 GPa (CFR-PEEK-15) and 23 GPa (CFR-PEEK-23) might be an alternative shell material compared to titanium in terms of shell and liner deformation, as well as

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32

Wu, Hai Hua, Di Chen Li, and Yi Ping Tang. "Fabrication of Integral Core/Shell Ceramic Casting Mould for Hollow Turbine Blade." Applied Mechanics and Materials 248 (December 2012): 231–36. http://dx.doi.org/10.4028/www.scientific.net/amm.248.231.

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The paper presents an integral core/shell fabrication of ceramic casting mould for hollow turbine blades by combining SL (Stereolithography) with gelcasting. This method could guarantee the positional accuracy between ceramic cores and shell, thus achieving the rapid fabrication of complex turbine blade castings. The paper focuses on the design of resin mould for gelcasting, the preparation of ceramic slurry, the pyrolysis of resin prototype and the sintering of ceramic green body. The feasibility and effectiveness of above mentioned method were verified through successful manufacturing of hol

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33

Elishav, Oren, Vadim Beilin, Gennady E. Shter, Omry Dinner, Victor Halperin, and Gideon S. Grader. "Formation of Core-Shell Mesoporous Ceramic Fibers." Journal of the American Ceramic Society 100, no. 8 (2017): 3370–74. http://dx.doi.org/10.1111/jace.15022.

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Leushina, L. I., I. O. Leushin, S. V. Plokhov, and V. B. Deev. "Recycling of shards of quartz ceramic shells from investment casting." Izvestiya Visshikh Uchebnykh Zavedenii. Chernaya Metallurgiya = Izvestiya. Ferrous Metallurgy 61, no. 11 (2018): 859–65. http://dx.doi.org/10.17073/0368-0797-2018-11-859-865.

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The use of quartz for its low-temperature modification creates additional risks in the manufacture of molds in the part of their reduced crack resistance due to polymorphous transformations and in practice it often leads to cracking and even destruction of individual layers of the shell wall or the mold as a whole. Preliminary calcination of the covering material practiced in many foundries can somewhat reduce the negative consequence of dangerous polymorphic transformations of quartz. But at the same time, smooth heating of the molds to reduce the likelihood of their cracking, which is carrie

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35

Vrátný, Ondřej, and Aleš Herman. "IMPORTANCE OF A TYPE OF GATING SYSTEM IN INVESTMENT CASTING TECHNOLOGY." Acta Polytechnica 59, no. 6 (2019): 601–10. http://dx.doi.org/10.14311/ap.2019.59.0601.

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At present, there is an increasing demand for the Investment casting technology. It is necessary to ensure their dimensional accuracy as well as internal quality and their desired macrostructure and microstructure. This paper deals with the issue of filling ceramic shells and their influence on the occurrence of oxide inclusions. The aim is to compare several proposed ceramic systems with top and bottom filling of a shell consisting of 4 blades and a gating system in terms of turbulence and monitoring of the contact line between the melt and the surrounded air.

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Li, Zhuo, Chenbo Wang, Zixuan Wang, et al. "Core-Shell Structure and Dielectric Properties of Ba0.6Sr0.4TiO3@ Fe2O3 Ceramics Prepared by Co-Precipitation Method." Crystals 11, no. 6 (2021): 623. http://dx.doi.org/10.3390/cryst11060623.

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Ba0.6Sr0.4TiO3 (BST) ceramic materials have been widely used in the field of multilayer ceramic capacitors. Surface modification through the surface coating to form a heterogeneous layer could effectively improve the dielectric properties. In this work, BST powders were prepared by a co-precipitation method. The effects of reaction conditions on the microstructure of the BST powder were investigated. The reaction temperatures significantly affected the morphology of BST powder, and the rhombic-type particles were obtained with the reaction temperature around 80 °C. Meanwhile, the BST@Fe2O3 was

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37

Sidebottom, Mark, D. Gordon Allan, and Manish Paliwal. "Analysis of a retrieved squeaking ceramic-on-ceramic hip arthroplasty bearing." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 13 (2016): 2373–83. http://dx.doi.org/10.1177/0954406216637085.

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Ceramic-on-ceramic bearings in total hip replacements have shown superior wear performance compared to other material couples. However, 1–10% of patients have reported squeaking with the use of ceramic-on-ceramic bearings. A ceramic-on-ceramic bearing was retrieved from a patient after 4.5 years in service secondary to squeaking. The explant was analyzed to investigate the possible factors attributing to the hip squeak utilizing acoustic analysis, visual inspection, modal analysis, random vibration analysis, and mathematical modeling. Random vibration analysis of the parts of the implant showe

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Żółkiewicz, Zdzisław, Łukasz Rogal, Wojciech Maj, et al. "Effect of Pouring Temperature and Heating of Ceramic Shells Mould on Projection of Thin Wall Castings." Journal of Applied Materials Engineering 60, no. 2 (2021): 81–89. http://dx.doi.org/10.35995/jame60020007.

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One of the research directions of this study is to determine the possibility of making precise, thin-walled castings from selected iron alloys. The scope of research work is aimed at determining the applicability of the casting process of selected iron alloys with the technology of wax pattern, for making precise castings with a wall thickness of less than 3 mm. The article presents the results of tests carried out for experimental castings with the shape of steps, characterized by different wall thicknesses: 1 mm, 5 mm, 10 mm, 25 mm. The castings were made of LH14, Gs42crMo4, L35H7MP2, LH26N9

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Huang, Chien Jung, Pin Hsiang Chiu, and Yeong Her Wang. "Synthesis of Core@Shell Composites with Gold Nanoparticles Trapped inside Ceramic Silica Shells by the Sol-Gel Method." Key Engineering Materials 368-372 (February 2008): 797–99. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.797.

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This paper describes a sol-gel (SG) method for the coating of gold nanoparticles with uniform shells of amorphous silica. The thickness of silica could be conveniently controlled in the range of 10 to 120 nm by increasing the amount of water. Although spherical gold nanoparticles generally have a surface plasmon resonance (SPR) at a wavelength of about 520 nm, a spherical gold core with a silica shell offers a very highly tunable SPR wavelength depending on the thickness of the silica shell.

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Rajala, Jonathan, Hyeon Shin, Dinesh Lolla, and George Chase. "Core–Shell Electrospun Hollow Aluminum Oxide Ceramic Fibers." Fibers 3, no. 4 (2015): 450–62. http://dx.doi.org/10.3390/fib3040450.

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Lu, Hong-Yang, Jong-Shing Bow, and Wen-How Deng. "Core-Shell Structures in ZrO2-Modified BaTiO3 Ceramic." Journal of the American Ceramic Society 73, no. 12 (1990): 3562–68. http://dx.doi.org/10.1111/j.1151-2916.1990.tb04258.x.

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Zhou, Wancheng, Litong Zhang, and Hengzhi Fu. "Glassy Phase in Alumina-Silica Ceramic Shell Molds." Journal of the American Ceramic Society 75, no. 1 (1992): 77–81. http://dx.doi.org/10.1111/j.1151-2916.1992.tb05445.x.

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Fucikova, Anna, Ilya Sychugov, and Jan Linnros. "The shell matters: one step synthesis of core–shell silicon nanoparticles with room temperature ultranarrow emission linewidth." Faraday Discussions 222 (2020): 135–48. http://dx.doi.org/10.1039/c9fd00093c.

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Gu, X. J., Ji Hong Zhu, W. H. Zhang, and J. S. Li. "The Topology Optimization Design for the Stereolithography Based Investment Casting Pattern." Materials Science Forum 697-698 (September 2011): 604–7. http://dx.doi.org/10.4028/www.scientific.net/msf.697-698.604.

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The purpose of this paper is to introduce the topology optimization method into the lattice style design for the rapid casting SL patterns. During the burnout procedure of the SL resin pattern, the thermal expansion will lead to the crack of the ceramic shell and fail the investment casting. Therefore, the SL patterns are always designed hollowed and some lattice styles are used to fill the cavity to solve the problem. In this paper, we propose to carry out the structural design by assigning the inner part of the SL pattern as the design domain where the material distribution is optimized with

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Toma, Alina Elena. "Coatings Innovations on the Inner Shell of Metal Grain Silos." Advanced Engineering Forum 21 (March 2017): 207–12. http://dx.doi.org/10.4028/www.scientific.net/aef.21.207.

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Some of the current research concerns the development of sustainability metallic silos study, highlights aspects of the treatment methods of the inner surface of the silos against the corrosive flow effects of granular material. By repeating the cycle of loading - unloading of granular material silo may lose bearing capacity due to the fatigue phenomenon. As a result, corrosion protection is required because of the silos can lead to a longer lifespan. Studies in this area aimed at finding new protection solutions, compatible with the granular material in store. In the field of metal silos, one

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Gunnison, Katie E., Mehmet Sarikaya, and Ilhan A. Aksay. "Toughening mechanisms in abalone shell." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (1990): 196–97. http://dx.doi.org/10.1017/s0424820100174114.

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Abalone shell (Haliotis Rufescens) is a naturally ocurring ceramic/polymer composite material. The system displays a unique laminated structure of calcium carbonate (aragonite) crystals in a matrix of biological macromolecules. The CaCO3 crystals and the organic matrix are arranged in a miniature “brick and mortar” structure referred to as nacre. Figure 1 is a TEM bright field micrograph illustrating the high degree of order observed in this microstructure.Although the nacre region of the shell is more than 95% CaCO3 by volume, the natural matrix material and the arrangement of the microstruct

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Roviras Miñana, Jordi, and Vicente Sarrablo Moreno. "Design of a New Solar Thermal Collector with Ceramic Materials Integrated into the Building Facades." Designs 2, no. 4 (2018): 44. http://dx.doi.org/10.3390/designs2040044.

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The work presented here aims to demonstrate the technical, architectural, and energy viability of solar thermal collectors made with ceramic materials and their suitability for domestic hot water (DHW) and building heating systems in the Mediterranean climate. The proposal is for the design of a ceramic shell, formed by collector and non-collecting panels, which forms part of the building system itself, and is capable of responding to the basic requirements of a building envelope and harnessing solar energy. Ceramics considerably reduce the final cost of the collector system and offer the new

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Sirisoam, Tiwasawat, Cherdsak Saelee, Sakdiphon Thiansem, and Sittiporn Punyanitya. "Characteristic, Microstructure and Properties of Dense Hydroxyapatite Ceramic from Cockle Shell for Biomaterials." Materials Science Forum 940 (December 2018): 3–7. http://dx.doi.org/10.4028/www.scientific.net/msf.940.3.

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Dense hydroxyapatite ceramic can be fabricated from hydroxyapatite (HA) powder prepared from cockle shells. The shell powder was treated at 900°C and co-precipitated with PO43- in NH4H2PO4 solution at Ca/P ratio of 1.67 in order to synthesize the HA powder. HA discs were formed by a hydraulic press machine and sintered at temperature of 1250°C for 2 h in an electric furnace which helps to dense ceramic. The results from FTIR analysis identified the functional groups of HA powder that has the ion stretching vibration around 3574, 2002 cm-1 for hydroxyl group (OH-), 1451 cm-1 for carbonate (CO32

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CHEN, BIN, XIANG-HE PENG, JING-HONG FAN, and WAN-LU WANG. "RESEARCH OF THE NANOMETER HELICOIDAL LAYUP OF RUFESCENS SHELL." International Journal of Modern Physics B 19, no. 01n03 (2005): 577–79. http://dx.doi.org/10.1142/s0217979205029079.

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A scanning electron microscope (SEM) observation on a Rufescens shell shows that the shell is a bio-ceramic composite consisting of aragonite sheets with nanometer scale and organic matrix. These nano-aragonite sheets are arranged in the shell in the form of helicoidal layup. The reason of the excellent fracture toughness of the shell is analyzed based on the maximal pullout force of the helicoidal layup of the aragonite sheets in the shell.

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Yen, Hsiao Chuan, and Hwa Hsing Tang. "Study on direct fabrication of ceramic shell mold with slurry-based ceramic laser fusion and ceramic laser sintering." International Journal of Advanced Manufacturing Technology 60, no. 9-12 (2011): 1009–15. http://dx.doi.org/10.1007/s00170-011-3664-0.

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