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Physical properties of refractory carbides of metals of IV and V groups of the periodic table during rapid heating by an electric current pulse

, ,
Joint Institute for High Temperatures, Russian Academy of Sciences, ul. Izhorskaya 13/19, Moscow, 127412, Russian Federation

method for studying the thermophysical properties of refractory carbides under pulsed electric heating for 5-10 microseconds is considered. Results are presented for (ZrC; ZrС+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 of the results obtained for all carbides are presented, and the choice of carbides for creating thermal protection is discussed.

Keywords: pulse heating, refractory carbides, temperature, melting, liquid state, thermophysical properties
DOI: 10.3367/UFNe.2021.06.038990
Citation: Savvatimsky A I, Onufriev S V, Aristova N M "Physical properties of refractory carbides of metals of IV and V groups of the periodic table during rapid heating by an electric current pulse" Phys. Usp., accepted

Received: 22nd, March 2021, revised: 1st, June 2021, 7th, June 2021

Оригинал: Савватимский А И, Онуфриев С В, Аристова Н М «Физические свойства тугоплавких карбидов металлов IV и V групп таблицы Менделеева при быстром нагреве импульсом электрического тока» УФН, принята к публикации; DOI: 10.3367/UFNr.2021.06.038990

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