Ag-Cu-Ti+W复合钎料钎焊SiC陶瓷的接头性能研究  

Properties of the joint of Si C ceramics brazed by Ag-Cu-Ti+W composite filler

作　　者：张超[1] 侯桂贤 钟志宏[1] 王志泉 ZHANG Chao;HOU Guixian;ZHONG Zhihong;WANG Zhi-quan(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《电焊机》2021年第5期97-102,I0007,共7页Electric Welding Machine

基　　金：国家磁约束核聚变能发展研究专项(2015GB121003)。

摘　　要：通过使用Ag-Cu-Ti钎料钎焊,可以实现Si C陶瓷的有效连接,但它与陶瓷母材热膨胀系数相差较大,钎焊降温过程中会产生较大的残余应力。通过向Ag-26.7Cu-4.5Ti钎料中复合不同体积分数的W颗粒,调节钎料的热膨胀系数,使之更接近于母材。通过改变钎焊温度和保温时间,研究工艺参数对焊缝的显微组织和力学性能的影响。结果表明,W颗粒均匀分布在基体中且未与其他元素反应。当添加合适的体积分数的W颗粒,并且在适当的钎焊温度和保温时间下,能够形成组织均匀、连接良好的复合接头。当添加的W的体积分数为10%,在钎焊温度为807 ℃、保温时间为10 min的条件下,可获得高剪切强度为95.05 MPa。The effective connection of Si C ceramics can be achieved through the brazing with Ag-Cu-Ti filler.A large residual stress is caused in the cooling process of brazing due to a big difference of thermal expansion coefficient between the filler and Si C ceramic.In this article,the thermal expansion coefficient of Ag-26.7 Cu-4.5 Ti filler is adjusted by adding W particles with different volume fraction to make it closer to Si C ceramics.The influence of brazing parameters on microstructure and mechanical properties of weld is studied by changing brazing temperature and holding time.The results show that W particles are uniformly distributed in the matrix and do not react with other elements.When adding a suitable volume fraction of W particles,a composite joint with uniform microstructure and good connection is formed under an appropriate brazing temperature and holding time.When the adding volume fraction of W is 10%,the maximum shear strength of 95.05 MPa is obtained at 807℃for 10 min.

关 键 词：SIC陶瓷 钎焊 Ag-Cu-Ti+W复合钎料 剪切强度 

分 类 号：TG425[金属学及工艺—焊接]