摘要
TMCs在高温服役长时使用过程中,基体与纤维会发生严重的界面反应,导致复合材料力学性能下降。以磁控溅射先驱丝法+热等静压工艺制备的SiC_(f)/TC25G复合材料作为研究对象,结合TC25G钛合金服役温度,系统设计了不同热暴露条件下复合材料界面热稳定性试验,分析了热等静压态和热暴露态SiC_(f)/TC25G复合材料界面形貌和界面产物。结合SEM、TEM、EPMA、XRD、EBSD等技术分析表明,热等静压态的SiC_(f)/TC25G复合材料界面反应层主要产物为TiC,反应层靠近基体侧和基体中存在硅化物的析出。随着热暴露温度和保温时间增加,界面反应层厚度增加。根据界面反应层增量,总结出SiC_(f)/TC25G复合材料界面长大规律,利用Arrhenius公式计算获得SiC_(f)/TC25G复合材料界面反应层长大激活能为50.53kJ/mol,反应层长大指数因子为1.23×10^(-7)m/s^(1/2)。
The prolonged exposure of TMCs to high temperatures results in severe interfacial reactions between the matrix and the fiber,leading to a degradation in the mechanical properties of the composites.In this study,SiC_(f)/TC25G composites were prepared using a magnetron sputtering precursor wire method followed by hot isostatic pressing process.The interface reaction and thermal stability of the composites were investigated.Specifically designed interfacial thermal stability experiments under different thermal exposure conditions were conducted based on the service temperature of TC25G titanium alloy.The resulting interfacial morphology and products of the composites under hot isostatic pressure and hot exposure were analyzed using various techniques including SEM,TEM,EPMA,XRD,and EBSD techniques.The primary product of the interface reaction layer in SiC_(f)/TC25G composites under hot isostatic pressure is validated as TiC,and the silicides in the reaction layer near the matrix side and the matrix precipitate in the form of(Ti,Zr)6Si3.As thermal exposure temperature and holding time increased,both the thickness of the interface reaction layer increases while that of the C coating decreases.Based on these observations,a growth law for SiC_(f)/TC25G composite was summarized.The activation energy for the growth of the interfacial reaction layer in SiC_(f)/TC25G composites is 50.53 kJ/mol,and the exponential factor for the reaction layer growth is 1.23×10^(-7)m/s^(1/2).
作者
孙武
张育铭
杨丽娜
杨青
刘迪
王玉敏
Sun Wu;Zhang Yuming;Yang Lina;Yang Qing;Liu Di;Wang Yumin(School of Materials Science and Engineering,Shenyang University of Chemical Technology,Shenyang 110142,Liaoning,China;Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China)
出处
《钢铁钒钛》
CAS
北大核心
2024年第5期74-82,共9页
Iron Steel Vanadium Titanium
基金
国家部委计划重点研究项目(No.TMC-00-02)。
