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Showing 1 to 20 of 693 for “"Alumina"”.
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Grain Boundary Structure in Alumina
Grain boundary microstructures in alumina ceramics are prone to show glassy phases, faceting, and some fraction of highly coincident twin-related boundaries. These separate phenomena and their inter- actions have been studied in six distinct materials of both commer- cial and experimental origin. …
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Electrophoretic Behavior of Alumina Suspensions
Made available in DSpace on 2014-12-10T17:32:37Z (GMT). No. of bitstreams: 1 6812161.pdf: 2978909 bytes, checksum: 556cc0fe88c9bdb9abee03ce16270071 (MD5) Previous issue date: 1968
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Model for porous alumina template formation
Anodized alumina templates have emerged as an important material system for the low cost fabrication of semiconductor and metal nanostructure arrays. This material system utilizes natural self-organization for the creation of periodic arrays of nanoscale structures. The underlying principle is that …
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Engineered Alumina / Silicon Carbide Laminated Composites
… to graduate the thermal expansion coefficient of alumina due to its relatively low specific density that could allow the production of lighter components with improved mechanical performance, also for high temperature applications. Ceramic laminates with strong interfaces composed of Al2O3/SiC …
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Flash Sintering of Alumina-based Ceramics
… behavior of a resistive technical ceramic like alumina also in the presence of magnesia silicate glass phase typically used for activating liquid phase sintering. The materials were studied by using different combinations of electric field and current density. Physical, structural and …
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Participation of Alumina in Heterogenous Catalysis
Made available in DSpace on 2014-12-09T17:36:24Z (GMT). No. of bitstreams: 1 7000809.pdf: 4248354 bytes, checksum: fbda36bc43f2b8a0b0a835ec50790f61 (MD5) Previous issue date: 1969
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The synthesis of beta alumina powders
Beta alumina solid electrolyte material is conventionally synthesized by the high temperature solid state reaction of α-Al₂O₃ with soda and a stabilizer ion such as lithia or magnesia. This reaction requires a reconstructive transformation of the α-Al₂O₃ oxygen sublattice and results in a two-phase …
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Fabrication of thin film nanoscale alumina templates
… of semiconductor nanostructures in a preformed alumina (Al2O 3) template. The template is created by electrochemically etching, or anodizing, a thin layer of aluminum deposited on a silicon or a glass substrate. When aluminum is anodized, a two dimensional periodic network of Al2 O3 cells with …
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Synthesis and Environmental Applications of Mesoporous Alumina
Mesoporous alumina was synthesized via the self-assembly of poly(ethylene oxide)-poly(butylene oxide)-poly(ethylene oxide) triblock copolymer and aluminum isopropoxide in the presence of nitric acid. This synthesis afforded mesoporous alumina materials with high specific surface area, large pore …
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Physical chemistry of carbothermic reduction of alumina
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1985.
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Pressureless infiltrated alumina and zirconia based steel - MMCs
Alumina and zirconia based steel-MMCs were produced by pressureless Ti-activated melt infiltration using a high vacuum furnace. The effect of particle size and morphology on the formation of a ceramic network in-situ and MMC properties were investigated using three different alumina powders. The …
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Study of mechanisms of phytotoxicity of alumina nanoparticles
Plant growth inhibitory effect of alumina nanoparticles has recently been reported (Ling Y, Watts D, 2004) but the mechanisms of such an effect are yet to be established. The phytotoxicity of aluminum and some of its compounds is well known, but the rapid expansion of nanotechnology resulting in …
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Decomposition of [delta]³-dihydropyran -dihydropyran over hot alumina
… on position 6 rearranges when passed over hot alumina. The resulting delta^2 -dihydropyran was labeled approximately equally on position 2 and 6. One way to account for the above rearrangement is to postulate double bond migration around the carbon ring from one side to the other. If this …
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Fatigue of alumina at room and high temperatures
Fatigue behavior of a polycrystalline alumina at room temperature and 1200$\sp\circ$C was investigated. Uniaxial tensile tests were conducted in both static and cyclic loading to produce stress-life curves. Cyclic loading at room temperature was found to be a deleterious effect on lifetime, as …
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