对Mo-Si-B三元系中各化合物不同温度下的标准生成自由焓和不同开始温度下合成Mo-Si-B三元系多相合金反应的绝热温度以及生成物的熔化比进行了计算和分析评估.结果表明,在元素配比合适的情况下,原位合成热力学稳定的α-Mo+Mo3Si+Mo5SiB2(T2)和Mo3Si+Mo5Si,(T1)+T2多相合金是完全可行的,合成反应的绝热温度以及生成物的熔化比与开始温度有关,原位合成这些多相合金不宜采用燃烧合成的SHS(自蔓延高温合成)模式,适合采用燃烧合成的热爆模式.
The standard formation free energies of compounds in Mo-Si-B ternary system at different temperatures were calculated.The adiabatic temperature and the molten ratio of resultants at different initial temperature for the reactions of synthesizing multiphase alloys in Mo-Si-B ternary system were obtained.The results show that it is feasible to synthesize in-situ α-Mo + Mo3Si + Mo5SiB2(T2)and Mo,Si+ Mo5Si3(T1)+ T2 multiphase alloys in the case of appropriate mixture ratio of elemental powders.The adiabatic temperature and the molten ratio of resultants are relative to the initial temperature.The explosion mode of combustion synthesis is more suitable than the SHS (self-propagating high-temperature synthesis)mode to in-situ synthesize these multiphase alloys.
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