摘要
计算Mg-TiO2和Al-TiO2体系自蔓延高温合成反应的吉布斯自由能、绝热温度、Ti的熔化率、Mg的汽化量。结果表明,Mg-TiO2/Al-TiO2体系很容易发生自蔓延高温合成反应,并且体系中存在生成多种Ti的低价氧化物的反应。Mg-TiO2体系的绝热温度随着Mg含量的增大而呈降低趋势,当Mg过量小于0.5mol时,体系的绝热温度在1800K以上。Al-TiO2体系的绝热温度也随着Al含量的增大而呈降低趋势,但随着预热温度的升高而升高。Mg-TiO2和Al-TiO2绝热温度曲线上出现的平台是由于Ti的熔化吸热所致。在反应过程中,由于Mg大量汽化,所以要使反应进行完全,配料时应适当地增加Mg的含量。
The reactive Gibbs free energies, reactive adiabatic temperature, melting rate of Ti and gasification weight of Mg in the Mg-TiO2 and Al-TiO2 system are theoretically calculated. The results show that the reactions of Mg-TiO2 and Al-TiO2 are very easy and the reactions producing various suboxides of Ti may occur in Mg-TiO2 and Al-TiO2 reaction system. The adiabatic temperature of Mg-TiO2 is decreased with the increase of excessive Mg, the adiabatic temperature is below 1800K when the excessive Mg exceeds 0. 5. The adiabatic temperature of Al-TiO2 is also decreased with the increase of excessive Al, but increased with the increase of the preheat temperature. The adiabatic temperature plateau is the result of Ti melting endotherm, owing to the gasification of a great deal of Mg in Mg-TiO2 reaction process, Mg should be properly excessive in order to get the Ti.
出处
《有色金属》
CAS
CSCD
北大核心
2009年第3期1-5,共5页
Nonferrous Metals
基金
甘肃省自然科学基金资助项目(0710RJZA062)
关键词
金属材料
TI
自蔓延高温合成
热力学分析
Keywords ： metal material
Ti
self-propagating high temperature synthesis
thermodynamics analysis
