摘要
收集了Mo-Si-C三元系在 12 0 0℃和 160 0℃下各组元和化合物的热力学数据 .估算了Mo -Si-C三元系中三元相T(Mo5Si3C)在12 0 0℃和 160 0℃下的Gibbs生成自由能 ,分别为 -883 .1kJ/mol和 -1112 .7kJ/mol,此数据乃首次报道 .利用Mo -Si-C三元系在该温度下的平衡相图以及收集和计算的该三元系的热力学数据 ,计算了该三元系中各组元的化学势 ,并作出了相应的化学势稳定性相图 .该相图结合平衡相图和热力学、动力学、物质平衡原则 ,可以从理论上分析和判断固态置换反应原位合成MoSi2
The published thermodynamic data of elements and intermetallic compounds of the Mo-Si-C ternary system at 1200°C and 1600°C are collected. The estimated Gibbs free energy of the formation of ternary-phase T (Mo5Si3C) in the Mo-Si-C system is -883.1 kJ/mol at 1200°C and -1112.7 kJ/mol at 1600°C. The collected and estimated thermodynamic data of intermetallic compounds and the equilibrium phase diagrams of the Mo-Si-C ternary system at 1200°C and 1600°C were utilized to calculate and draw the stabilized chemical potential diagrams of the Mo-Si-C ternary system. The diagrams combined with the equilibrium phase diagrams of the Mo-Si-C ternary system and the principles of thermodynamic, kinetics, mass-balance could be used to theoretically analyze and judge the reaction-paths of in the situ synthesis of MoSi2-SiC composites through solid-state displacement reactions.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2002年第2期193-197,共5页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金资助项目 (5 9672 0 3 3 )
