Abstract: The thermodynamic data of Mo-Si-C ternary sys tem were collected and calculated. The equilibrium phase diagram of Mo-Si-C ternary system at 1200℃ and the estimated thermodynamic data of intermetallic compounds were utiliz ed to calculate stabilized chemical potential and to draw the stabilized chemical potential diagrams of Mo-Si-C ternary system. The applications of the principles of thermodynamics，mass balance and kinetics to the synthesis of in situ composites through solid-state displacement reactions has been discussed. Applying these principles to the synthesis of in situ MoSi2-SiC composites，it is shown that the proper starting reaction materials are Mo2C and Si. The use of equilibrium phase diagram and stabilized chemical potential diagrams of Mo-Si-C ternary system at 1200℃ for analyzing reaction paths of the synthesis of in situ MoSi2-SiC composites through solid-state displacement reactions is demonstrated.
详情信息展示
DOI:10.19476/j.ysxb.1004.0609.2002.01.005
1200℃Mo-Si-C三元系组元化学势稳定性相图
甘国友 孙加林 陈敬超 陈永翀 严继康
昆明理工大学材料与冶金工程学院
昆明理工大学材料与冶金工程学院 昆明650093
摘 要：
收集并计算了Mo Si C三元系在 12 0 0℃下各组元化合物的热力学数据。利用Mo Si C三元系在该温度下的平衡相图以及收集计算的热力学数据 , 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。讨论了热力学、物质平衡和动力学原则在固态置换反应原位合成复合材料中的应用。对于MoSi2 SiC复合材料的原位合成 , 可以确定反应起始物为Mo2 C和Si。利用Mo Si C三元系 12 0 0℃下的平衡相图和组元化学势稳定性相图分析了固态置换反应原位合成MoSi2 SiC复合材料可能的反应路径。
Stabilized chemical potential diagrams for Mo-Si-C ternary system at 1200 ℃
Abstract：
The thermodynamic data of Mo Si C ternary system were collected and calculated. The equilibrium phase diagram of Mo Si C ternary system at 1?200?℃ and the estimated thermodynamic data of intermetallic compounds were utilized to calculate stabilized chemical potential and to draw the stabilized chemical potential diagrams of Mo Si C ternary system. The applications of the principles of thermodynamics, mass balance and kinetics to the synthesis of in situ composites through solid state displacement reactions has been discussed. Applying these principles to the synthesis of in situ MoSi 2 SiC composites, it is shown that the proper starting reaction materials are Mo 2C and Si. The use of equilibrium phase diagram and stabilized chemical potential diagrams of Mo Si C ternary system at 1?200?℃ for analyzing reaction paths of the synthesis of in situ MoSi 2 SiC composites through solid state displacement reactions is demonstrated.
