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Oxidation of Ta x Ti 1− x C whiskers under formation of carbon

Oxidation of Ta x Ti 1− x C whiskers under formation of carbon J O U R N A L O F M A T E R I A L S S C I E N C E L E T T E R S 2 1, 2 0 0 2, 955 – 958 M. JOHNSSON Department of Inorganic Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden E-mail: matsj@inorg.su.se S. SHIMADA Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan Tantalum carbide (TaC) and titanium carbide (TiC) are both promising compounds for use as reinforcing materials in high-temperature structural ceramic composites. Both compounds have high melting points (>3000 ◦ C) and high strength. By changing the chemical composition as outlined by the formula Tax Ti1−x C (0 ≤ x ≤ 1), properties such as the thermal expansion coefficient and the heat conductivity can be tailored. In order to characterize those potential high temperature materials, their oxidation behavior is important to study. Several carbide phases are known to oxidize under transient formation of carbon e.g. ZrC, TiC, HfC, and NbC under certain conditions [1]. The oxidation mechanisms have been studied in some detail during recent years, and the following main reactions can generally be discerned. MeC + http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science Springer Journals
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