(昆明理工大學(xué) 材料與冶金工程學(xué)院，昆明 650093)
摘 要: 收集并計算了Mo-Si-C三元系在1200℃下各組元化合物的熱力學(xué)數(shù)據(jù)。利用Mo-Si-C三元系在該溫度下的平衡相圖以及收集計算的熱力學(xué)數(shù)據(jù)，計算了該三元系中各組元的化學(xué)勢，并作出了相應(yīng)的化學(xué)勢穩(wěn)定性相圖。討論了熱力學(xué)、物質(zhì)平衡和動力學(xué)原則在固態(tài)置換反應(yīng)原位合成復(fù)合材料中的應(yīng)用。對于MoSi2-SiC復(fù)合材料的原位合成，可以確定反應(yīng)起始物為Mo2C和Si。利用Mo-Si-C三元系1200℃下的平衡相圖和組元化學(xué)勢穩(wěn)定性相圖分析了固態(tài)置換反應(yīng)原位合成MoSi2-SiC復(fù)合材料可能的反應(yīng)路徑。
關(guān)鍵字: Mo-Si-C三元系；平衡相圖；化學(xué)勢；化學(xué)勢穩(wěn)定性相圖
diagrams for Mo-Si-C ternary
system at 1200℃
CHEN Yong-chong，YAN Ji-kang
（School of Materials and Metallurgy Engineering，
Kunming University of Science and Technology，
Kunming 650093，China）
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.
Key words: Mo-Si-C ternary system;equilibrium phase diagram; chemical potential;stabilized chemical potential diagram
