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Thermal Transport in Refractory Carbides.
Final technical rept.,
PURDUE UNIV LAFAYETTE IND PROPERTIES RESEARCH LAB
Pagination or Media Count:
Thermal energy transport mechanisms in titanium carbide and zirconium carbide have been studied. Several compositions of vanadium carbide alloyed with titanium carbide were used. The electronic component of the thermal conductivity exceeded the values computed using the classical value for L in the Wiedemann-Franz-Lorenz law. The results could be explained by allowing L to increase with increasing temperature. In the case of zirconium carbide, samples with various degrees of carbon vacancies were used. There was a remarkable increase in the electron and phonon contributions to the thermal conductivity as the carbon vacancy concentration was decreased near the stoichiometric composition. The temperature dependency of the thermal conductivity could be explained in terms of a substantial residual resistivity and an L which increased with increasing temperature, and that was somewhat dependent on the carbon vacancy concentration. Modified author abstract
APPROVED FOR PUBLIC RELEASE