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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 645 for “"Carbide"”.
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Sintering of silicon carbide
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1986.
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Carbon stars and silicon carbide
… by carbonaceous compounds. One of these, silicon carbide (SiC) has been extensively investigated in an attempt to discover the conditions present in these dust shells. In this work, we investigate the nature and uses of SiC for astronomical research, and in particular what SiC can tell us about …
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Self-diffusion in silicon carbide.
Massachusetts Institute of Technology. Dept. of Metallurgy. Thesis. 1965. Sc.D.
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Characterization of Uranium Carbide Microspheres In An Inert Zirconium Carbide Matrix For Gas Fast Reactors
… of a dispersion/composite fuel involving Uranium Carbide (UC) and Zirconium Carbide (ZrC) have been characterized and studied. Uranium carbide (UC) microspheres produced in the USC-Nuclear Materials Laboratory were subjected to metallographic techniques, and then characterized by analytical …
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Engineered Alumina / Silicon Carbide Laminated Composites
High-melting temperature oxides, carbides and nitrides are superior in hardness and strength to metals, especially in severe conditions. However, the extensive use of such ceramics in structural engineering applications often encountered critical problems due to their lack of damage tolerance and …
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Ion Implantation Synthesis of Silicon Carbide
… annealing, a buried or near surface silicon carbide grains in host silicon matrix was formed, and the disordered range narrowed. A maximum C/Si ratio of about 0.2 or less was measured for all the samples.
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Silver transport in CVD silicon carbide
… transport through and release from CVD silicon carbide. Results of these experiments show that silver does not migrate via classical diffusion in silicon carbide. Silver release is, however, likely dominated by vapor transport through cracks in SiC coatings. The results of silver ion …
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Non-stoichiometry and radiation damage effects in zirconium carbide and layered carbide ceramics for nuclear fuel cladding applications
Sub-stoichiometric Zirconium Carbide (ZrC) is a viable candidate for use in nuclear environments as it has shown desirable thermo-physical properties and an ability to tolerate radiation damage. These thermophysical properties, in some cases, are sensitive to stoichiometry making ZrC a customisable …
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Processing of nano-sized boron carbide powder
Recent studies indicate B4C nanopowder may provide additional advantages without loss of established properties. In this study, preliminary forms of graphite-coated B4C nanopowders on the order of 20-40 nm with various additives were sintered and analyzed. Methanol washing was performed on the …
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Novel Three-Dimensional Silicon Carbide Nano-Structures
Silicon carbide nanotubes have been found to have the same excellent mechanical properties in extreme thermal and oxidative environments as bulk silicon carbide, but with the resiliency similar to carbon nanotubes due to quantum size effects. The simplest, most cost efficient method to synthesize …
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Fusion welding of diboride-carbide ceramic composites
<p>"Plasma and pulsed plasma arc welding (PAW and PPAW) processes were used to fusion weld ZrB<sub>2</sub> containing 20 vol% ZrC. Varying welding parameters resulted in changes in weld pool shape and size, and the size of ZrB<sub>2</sub> grains within the fusion zone. For PAW processes that …
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The Electroanalytical Utility of Boron Carbide Electrodes
Made available in DSpace on 2014-12-09T17:35:49Z (GMT). No. of bitstreams: 1 6801706.pdf: 2579901 bytes, checksum: 825e55b8f5b0f623d2393fa4662c140c (MD5) Previous issue date: 1967
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Electromigration and chemical diffusion in titanium carbide
… and lattice diffusion of carbon in titanium carbide have been investigated through studies of diffusion under the influences of kan applied dc-electric field and of a chemical potential. The electron microprobe was used to measure the diffusion concentration profiles. Electromigration studies …
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The fabrication of silicon carbide heating elements
… the relative amounts of α- and β-silicon carbide present in these materials. It was confirmed that the α- to β-silicon carbide transformation occurs during heat treatment, because of the influence of the nitrogen atmosphere in the furnace. The fabrication parameters important in the …
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Silicon carbide oxidation in high temperature steam
… offering promising results is the use of silicon carbide (SiC) cladding in nuclear reactor fuel rod designs. SiC, a robust ceramic which reacts very slowly with water or steam, has many features that meet or exceed that of zircaloy including the ability to withstand higher temperatures due to a …
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Tungsten carbide-cobalt by Three Dimensional Printing
… et al, 1990]. Green (not sintered) tungsten carbide-cobalt parts must have a density greater than 50% of the theoretical density, 14.9 g/cc, for proper sintering and post-processing. Two approaches were assessed for feasibility and robustness: printing slurry into tungsten carbide-cobalt …
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