摘要
SiC continuous fiber-reinforced pure Ti(TA1)matrix composites were fabricated by a vacuum hot pressing(VHP)methodand then heat-treated in vacuum under different conditions.The interfacial reaction and the formation of interfacial phases werestudied by using SEM,EDS and XRD.The results show that there exists reaction diffusion at the interface of SiC fibers and Timatrix,and the concentration fluctuation of reaction elements such as C,Ti and Si appears in interfacial reaction layer.The interfacialreaction products are identified as Ti3SiC2,TiCx and Ti5Si3Cx.At the beginning of interfacial reaction,the interfacial reactionproducts are TiCx and Ti5Si3Cx.Along with the interfacial reaction diffusion,Ti3SiC2 and Ti5Si3Cx single-phase zones come forth inturn adjacent to SiC fibers,and the TiC+Ti5Si3Cx double-phase zone appears adjacent to Ti matrix,which forms discontinuousconcentric rings by turns around the fibers.The formed interfacial phases are to be Ti3SiC2,Ti5Si3Cx and TiCx+Ti5Si3Cx from SiCfiber to Ti matrix.The interfacial reaction layer growth is controlled by diffusion and follows a role of parabolic rate,and theactivation energy(Qk)and(k0)of SiC/TA1 are 252.163 kJ/mol and 7.34×10?3m/s1/2,respectively.
SiC continuous fiber-reinforced pure Ti（TA1） matrix composites were fabricated by a vacuum hot pressing（VHP） method and then heat-treated in vacuum under different conditions. The interracial reaction and the formation of interracial phases were studied by using SEM, EDS and XRD. The results show that there exists reaction diffusion at the interface of SiC fibers and Ti matrix, and the concentration fluctuation of reaction elements such as C, Ti and Si appears in interracial reaction layer. The interracial reaction products are identified as Ti3SiC2, TiCx and Ti5Si3Cx. At the beginning of interracial reaction, the interracial reaction products are TiCx and TisSi3Cx. Along with the interracial reaction diffusion, Ti3SiC2 and Ti5Si3Cx single-phase zones come forth in turn adjacent to SiC fibers, and the TiC＋Ti5Si3Cx double-phase zone appears adjacent to Ti matrix, which forms discontinuous concentric rings by turns around the fibers. The formed interracial phases are to be Ti3SiC2, TisSi3Cx and TiCx＋TisSi3Cx from SiC fiber to Ti matrix. The interfacial reaction layer growth is controlled by diffusion and follows a role of parabolic rate, and the activation energy （Q^k） and （k0） of SiC/TA1 are 252.163 kJ/mol and 7.34×10^-3 m/s^1/2, respectively.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
2007年第1期27-34,共8页
Transactions of Nonferrous Metals Society of China
基金
Project(50371069)supported by the National Natural Science Foundation of China
Project(20030699013)supported by the StateEducation Ministry Doctoral Foundation of China
Project(04G53044)supported by the Foundation of Aviation Science of China
关键词
碳化硅纤维
活化能
强度
合金
机械性能
SiC/TAlcomposite
reaction diffusion
interfacial phases
activation energy
