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Physical properties of refractory carbides of metals of groups IV and V of the Mendeleev periodic table during rapid heating by an electric current pulseJoint Institute for High Temperatures, Russian Academy of Sciences, ul. Izhorskaya 13/19, Moscow, 127412, Russian Federation A method for studying the thermophysical properties of refractory carbides under pulsed electric heating for 5—10 microseconds is considered. Results are presented for (ZrC; Zr+C; TaC+HfC; HfC) as a function of the temperature measured from ∼ 2000 K to 5000 K. Data on enthalpy, specific heat Cp, heat of melting, and electrical resistance are given. For all the studied carbides, a sharp increase in the specific heat of the solid phase is observed at ≈ 300 K before melting. This may be due to the formation of paired Frenkel defects under conditions of a short heating time. Comparative data on the results obtained for all carbides are presented, and the choice of carbides for creating thermal protection is discussed.
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