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计算了Mo-Si-B三元系中各化合物不同温度下标准生成自由焓和合成Mo5SiB2(T2相)反应在不同开始温度下的绝热温度及反应产物的熔化比.结果表明:用Mo、Si和B三种元素粉末混合物来原位合成Mo5SiB2在热力学上是完全可行的;合成Mo5SiB2不宜用燃烧合成的自蔓延模式,宜采用燃烧合成的热爆模式(原位反应热压工艺);反应的绝热温度及反应产物的熔化比与开始温度有关.
The adiabatic temperature and the melting ratio of the reaction products at different starting temperatures of Mo 5 SiB 2 (T2 phase) reaction at different temperatures of Mo-Si-B ternary system were calculated. The results show that the molar ratio of Mo, Si And B powder to synthesize Mo5SiB2 in situ is completely feasible in thermodynamics. The synthesis of Mo5SiB2 is not suitable for self-propagating combustion mode. It is advisable to adopt the thermal explosion mode of combustion synthesis (in-situ reaction hot pressing) The adiabatic temperature and the melting ratio of the reaction product are related to the starting temperature.