温度对添加泡沫Cu的TC17-C/C复合材料钎焊接头力学性能和微观组织的影响  

Effect of Temperature on Mechanical Properties and Microstructure of TC17-C/C Composites Joint Brazed with Addition of Foam Cu

作　　者：李奎[1] 朱颖[1] 郭伟[1] 彭鹏[1] 孙汝剑 LI Kui; ZHU Ying; GUO Wei; PENG Peng; SUN Rujian(School of Mechanical Engineering and Automation, Beihang University, B eijing 100191, China)

机构地区：[1]北京航空航天大学机械工程及自动化学院

出　　处：《热加工工艺》2018年第19期53-57,共5页Hot Working Technology

基　　金：国家自然科学基金项目(11372019,51675030)

摘　　要：以泡沫Cu作为应力缓冲中间层,采用Ag-Cu-Ti合金作为钎料,采用不同的温度真空钎焊C/C复合材料和TC17钛合金。通过剪切试验测试不同钎焊温度下接头的力学性能,并采用SEM、EDS和XRD分析钎焊接头的微观组织。研究表明：当钎焊温度为860℃时,钎焊接头获得最大的剪切强度24 MPa。钎焊后,中间层与母材连接紧密,无界面缺陷。在TC17钛合金侧,Ti元素和Cu元素发生界面反应,依次形成CuTi2、CuTi的反应层;在中间层,Cu和Ti相互结合形成Cu4Ti3金属化合物,还有Ag（s,s）和Cu（s,s）相;在C/C复合材料一侧,Ti和C发生界面反应形成Ti C化合物,改善了钎料对C/C复合材料表面的润湿性能,增强了钎焊接头的连接效果。The C/C composites and TC17 titanium alloy were brazed under different brazing temperatures with Cu foam as the stress buffer interlayer and Ag-Cu-Ti system alloy as filler.The mechanical properties of the joint under different brazing temperature were tested by shearing test,and the microstructure of the brazing joint was analyzed by SEM,EDS and XRD.The results shows that when the brazing temperature is 860℃,the brazed joint with the highest shear strength of 24MPa is obtained.After brazing,the interlayer is closely connected with the base metals,and there is no interface defect.The interfacial reaction between Ti and Cu elements occurs at the side of TC17 titanium alloy,and the reaction layer of CuTi2and CuTi is formed.In the middle layer,Cu and Ti combine to form Cu4Ti3metal compound,and there are also Ag（s,s）and Cu（s,s）phases.The interfacial reaction between Ti and C at the side of C/C composites occurs and Ti C compound forms,which improves the wettability of filler metal on the surface of C/C composites and enhances the bonding of the brazed joint.

关 键 词：C/C复合材料 钛合金 微观结构 剪切强度 

分 类 号：TG454[金属学及工艺—焊接]