We studied the carbide Ta_0.81Hf_0.19C_0.94 in the form of a thin deposited layer (1 μm) under rapid heating (5 μs) by electric current pulse. We obtain the properties of this carbide: melting heat; specific heat, and enthalpy in the solid phase from 2000 K up to T_melt = 4300 K, and for the first time in the liquid state up to 5000 K. We measured the temperature by high-speed radiation pyrometer calibrated against the tungsten temperature lamp. Here, we confirm the earlier obtained experimental data on the melting temperature of this compound obtained by black body model and thus, we confirm that this compound has the maximum melting temperature as against the other refractory carbides (TaC and HfC). Under fast heating, the steep increase of the specific heat of the carbide Ta_0.81Hf_0.19C_0.94 for 400 K before melting was observed.

我们通过电流脉冲在快速加热（5μs）下以薄沉积层（1μm）的形式研究了碳化物Ta _0.81 Hf _0.19 C _0.94。我们得到了这种碳化物的特性：熔化的热量；从2000 K到T_熔体的比热和固相焓 = 4300 K，并且在液态时首次达到5000K。我们通过针对钨温度灯校准的高速辐射高温计测量了温度。在这里，我们确认了较早获得的有关通过黑体模型获得的该化合物的熔融温度的实验数据，因此，我们确认了该化合物相对于其他难熔碳化物（TaC和HfC）具有最高熔融温度。在快速加热下，观察到熔化前400 K时碳化物Ta _0.81 Hf _0.19 C _0.94的比热急剧增加。