SiC添加对W/AgCuTi/Cu钎焊接头组织与力学性能的影响  

Effect of SiC adiition on microstructure and mechanical properties of the W/AgCuTi/Cu brazed joint

作　　者：王刚[1] 丁慕晗 张俊杰 张成林 赵禹 WANG Gang;DING Muhan;ZHANG Junjie;ZHANG Chenglin;ZHAO Yu(Anhui Key Laboratory of High-performance Non-ferrous Metal Materials,Anhui Polytechnic University,Wuhu,241000,China;Anhui Tuobao Additive Manufacturing Technology Corporation Limited,Wuhu,241200,China;NBTM New Materials Group Corporation Limited,Ningbo,315000,China)

机构地区：[1]安徽工程大学,高性能有色金属材料安徽省重点实验室,芜湖241000 [2]安徽拓宝增材制造科技有限公司,芜湖241200 [3]东睦新材料集团股份有限公司,宁波315000

出　　处：《焊接学报》2023年第5期55-61,I0006,共8页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(52101030,52171148);安徽省杰出青年科学基金项目(2008085J23);安徽工程大学-繁昌区产业协同创新专项基金(2021fccyxtb3).

摘　　要：为研究碳化硅(SiC)添加对缓解钨-铜钎焊接头残余应力的作用效果及机理,采用真空钎焊技术获得不同碳化硅含量(质量分数为0~20%)的W/SiC-AgCuTi/Cu钎焊接头,分析焊接接头组织演变及剪切性能变化规律.结果表明,随着SiC含量的增加,钎焊接头剪切强度先提升后降低.当SiC的质量分数为10%时,钎焊接头的剪切强度达到峰值120 MPa,比未添加SiC的焊接接头强度提升45%左右.分析认为,少量(质量分数为0~10%)的SiC硅在W-Cu焊缝组织中较均匀分布,可有效缓解母材热失配带来的焊接残余应力,提升焊接接头强度.但过量(质量分数为20%)的SiC易在焊缝组织中聚集成大尺寸块体,剪切过程中形成应力集中,不利于焊接接头强度进一步提升.创新点:(1)通过向焊料添加SiC的方式有效释放了W-Cu钎焊接头的残余应力.(2)有限元模拟结合试验表征阐释了不同SiC含量的W-Cu钎焊接头断裂机制.To study the effect and mechanism of SiC addition on relieving residual stress in tungsten-copper brazed joints,several W/SiC-AgCuTi/Cu brazed joints with different SiC contents were obtained using vacuum brazing technology.The microstructure evolution and shearing properties of the joints were analyzed.The results show that the shear strength of the brazed joint initially increases and then decreases with increasing SiC addition.When the addition of SiC increases to 10%,the shear strength of the brazed joint reaches 120 MPa,45%higher than that of the welded joint without SiC.It was proposed that a small amount of SiC(0-10%)can be uniformly distributed in the W-Cu brazed joint,effectively relieving welding residual stress and improving joint strength.However,excess SiC(20%)tends to aggregate into large blocks in the joint,resulting in stress concentration during shearing,which counteracts strengthening of the W-Cu brazed joint.Highlights:(1)The residual stress of W-Cu brazed joint is released effectively by adding SiC into the filler.(2)The fracture mechanisms of W-Cu brazed joints with different SiC addition were explained based on the finite element simulation and experimental characterization.

关 键 词：钨-铜 钎焊 残余应力 碳化硅 接头强度 

分 类 号：TG454[金属学及工艺—焊接]