自蔓延高温合成TiC-Al的热力学计算与分析  

The Thermodynamic Calculation and Analysis of Self-propagating High-temperature Synthesis TiC-Al

作　　者：何祖明[1] 冯旺军[1] 夏咏梅[1] 杨华[1] 

机构地区：[1]甘肃省有色金属新材料国家重点实验室

出　　处：《甘肃科学学报》2008年第3期35-38,共4页Journal of Gansu Sciences

基　　金：甘肃省有色金属新材料国家重点实验室(SKL05009)

摘　　要：对Al-Ti-C三元体系进行了热力学计算,绘出了反应的标准自由焓随温度变化的曲线、绝热温度随Al含量变化的曲线以及绝热温度随预热温度变化的曲线.分析表明:三元体系的主要反应是Ti+C=TiC.体系的绝热温度随Al含量的增加而下降,当预热温度为650 K时,Al最佳的理论含量约57.5%,体系的绝热温度随预热温度的升高而升高;若Al含量过大,体系的绝热温度小于1800 K时,可以适当的提高预热温度,来确保反应的自发进行.According to the thermodynamic principles, the Al-Ti-C system is thermodynamically calculated. We have drawn the curves of standard free enthalpy with temperature changes, the curves of adiabatic temperature with Al content changes and the curves of adiabatic temperature with preheating temperature. The analytic result shows：the main reaction formula of the three element system is Ti＋C= TiC. When AI content of the system is increased, the adiabatic temperature of the system will descend. If preheating temperature is 650K, the optimal theo- retical Al＇content is 57. 5%. When the preheating temperature goes up, the adiabatic temperature of the system will go up. When the AI content is too high and the adiabatic temperature of the system is under 1 800K, the heightening preheating temperature can make it sure that the reaction is spontaneous.

关 键 词：自蔓延高温合成 热力学 自由焓 绝热温度 

分 类 号：TG111.3[金属学及工艺—物理冶金]