自蔓延高温合成TiC-Ni金属陶瓷的热力学编程计算与分析

根据热力学原理对Ti、C、Ni三元体系进行热力学编程计算，绘出了标准反应自由焓随温度变化的曲线、绝热温度随Ni含量变化的曲线以及绝热温度随预热温度变化的曲线，通过对曲线进行分析认为：Ti、C、Ni三元体系的主反应是Ti C=TiC；体系的绝热温度随Ni含量的增加而下降，当预热温度为600K时，最佳的理论Ni含量约40％；体系的绝热温度随预热温度的升高而升高，当Ni含量过大，体系的绝热温度小于1800K时，可以适当提高预热温度，来确保反应的自发进行。

Computation and Analysis of Thermodynamics of Self-propagating High-temperature Synthesis TiC-Ni Cermets

The curves of standard reaction free enthalpies and te m perature,adiabatic temperature and Ni content,adiabatic temperature and preheati ng temperature have been drawn by thermodynamic programming calculation based on thermodynamic principle.The results show that the main reaction of Ti-C-Ni sy stems is Ti+C=TiC.Adiabatic temperature of the system decreases with the increas e of Ni content and the optimal Ni content is about 40% for preheating temperatu re of 600K.Adiabatic temperature increases with increasing preheating temperatur e and properly increasing preheating temperature can ensure the reaction self-s ustaining when Ni content is excessive and adiabatic temperature is under 1800K.