Ti-Si-C三元体系自蔓延高温合成的反应热力学研究  

Study on the thermodynamics of Ti-Si-C system in SHS

作　　者：王晓峰[1] 李建伟[1] 曹钦存[1] 

机构地区：[1]洛阳理工学院材料工程系,河南洛阳471023

出　　处：《粉末冶金技术》2008年第4期286-290,共5页Powder Metallurgy Technology

摘　　要：根据热力学原理对Ti-Si-C三元体系进行了热力学计算分析,计算了Ti3SiC2自蔓延高温合成的绝热温度,绘出了体系各反应产物的反应自由焓ΔG与反应温度T的关系曲线,并测量了Ti3SiC2自蔓延高温合成的实际燃烧温度。研究结果表明:Ti-Si-C三元体系在SHS反应过程中其燃烧波能够自发进行;在SHS反应的高温区域,反应产物的热力学稳定性从高到低依次为Ti3SiC2、SiC、TiC,TiC和SiC有向Ti3SiC2反应转化的趋势;Ti3SiC2的SHS反应实际燃烧温度低于其理论绝热温度,主要原因是实际进行的SHS反应存在热量损失所致。By thermodynamic calculation based on thermodynamic principle, the adiabatic temperature of Ti3SiC2 has been calculated and the curves of free enthalpies of reaction products vs temperature have been drawn in SHS. The combustion temperature of TiaSiC2 was measured. The results show that the combustion waves of Ti - Si - C system can be spontaneous during SHS. In the high temperature range of SHS , the order of thermodynamic stability of the products is Ti3SiC2, SiC, TiC. So the combustion product of Ti3SiC2 will be resulted from TiC and SiC. The heat loss in practical SHS is one of reasons making the combustion temperature lower than the adiabatic temperature of Ti3SiC2.

关 键 词：Ti—Si—C体系 自蔓延高温合成 热力学 

分 类 号：TQ174.758[化学工程—陶瓷工业] TB333[化学工程—硅酸盐工业]