Thermophysical properties of the most refractory carbide Ta0.8Hf0.2C under high temperatures (2000-5000 K)

被引：43

作者：

Savvatimskiy, A. I. ^{[1
]}

Onufriev, S. V. ^{[1
]}

Muboyadzhyan, S. A. ^{[2
]}

机构：

[1] Russian Acad Sci, JIHT, Moscow 125412, Russia

[2] Natl Sci Res Inst Aviat Mat VIAM, Moscow 105005, Russia

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2019年 / 39卷 / 04期

基金：

俄罗斯科学基金会;

关键词：

Pulse electrical heating; Carbide Ta0.8Hf0.2C; Heat of melting; Specific heat; Enthalpy;

D O I：

10.1016/j.jeurceramsoc.2018.11.030

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We studied the carbide Ta0.81Hf0.19C0.94 in the form of a thin deposited layer (1 mu m) under rapid heating (5 mu s) 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 Ta0.81Hf0.19C0.94 for 400 K before melting was observed.

引用

页码：907 / 914

页数：8