保温时间对Ni-Sn复合钎焊接头组织性能的影响  

Effect of holding time on microstructure and properties of Ni-Sn composite brazed joint

作　　者：张声金 程东海[1] 张夫庭 亓安泰 成家龙 ZHANG Sheng-jin;CHENG Dong-hai;ZHANG Fu-ting;QI An-tai;CHENG Jia-long(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学航空与工程制造学院,江西南昌330063

出　　处：《材料热处理学报》2024年第5期197-203,共7页Transactions of Materials and Heat Treatment

基　　金：江西省自然科学基金(20212BAB204044)。

摘　　要：针对Ni/Ni-Sn/Ni复合钎焊,提出采用界面金属间化合物(Intermetallic compound,IMC)层厚度及钎缝内部IMC含量(体积分数)分别表征钎焊过程中界面及钎缝内部组织演变进程,研究保温时间对Ni-Sn复合钎焊接头组织性能的影响。结果表明:接头内只生成一种金属间化合物Ni_(3)Sn_(4),主要分布在母材界面和钎缝内所有Ni颗粒周围;界面IMC层厚度及钎缝内部Ni_(3)Sn_(4)含量均随着保温时间的增加不断增加,当保温240 min时,金属间化合物含量高达83.23%,形成了由Ni_(3)Sn_(4)化合物以及残余Ni颗粒组成的耐高温钎焊接头;接头剪切强度随保温时间的增加呈先上升后缓慢下降的趋势,断裂位置由钎缝内部向界面转移,当保温180 min时,接头的剪切强度达到最大值28.47 MPa,此时断裂位置刚好发生在界面IMC层处。For Ni/Ni-Sn/Ni composite brazing,it was proposed to use the thickness of the intermetallic compound(IMC)layer and the IMC content(volume fraction)in the weld to characterize the evolution process of the interface and internal microstructure of the weld during the brazing process,and the effect of holding time on the microstructure and properties of the Ni-Sn composite brazing joints was studied.The results show that only one intermetallic compound Ni_(3)Sn_(4) is formed in the joint,and mainly distributed at the interface of the base metal and around all Ni particles in the weld.The thickness of the IMC layer at the interface and the content of Ni_(3)Sn_(4) inside the brazing joint continuously increase with the increase of holding time.When the holding time is 240 min,the content of intermetallic compounds reaches 83.23%,forming a high-temperature resistant brazing joint composed of Ni_(3)Sn_(4) compounds and residual Ni particles.The shear strength of the joint shows a trend of first increasing and then slowly decreasing with the increase of holding time,and the fracture position shifts from the inside of the weld to the interface.When the holding time is 180 min,the shear strength of the joint reaches the maximum value of 28.47 MPa,and the fracture position occurs at the IMC layer of the interface.

关 键 词：Ni-Sn复合钎料 金属间化合物 剪切强度 

分 类 号：TG454[金属学及工艺—焊接]