低银Ag_(20)Cu_(3)5Zn_((43.5-x-y))Mn_(x)Sn_(y)Ni_(1.5)箔带钎料的组织和钎焊性能  

Microstructure and brazing properties of Ag_(20)Cu_(3)5Zn_((43.5-x-y))Mn_(x)Sn_(y)Ni_(1.5)foil-filler brazing alloy

作　　者：王学程 范佳锋 李小强[1] 钱浩 许长羽 WANG Xuecheng;FAN Jiafeng;LI Xiaoqiang;QIAN Hao;XU Changyu(National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials,South China University of Technology,Guangzhou,510641,China;China Railway 18th Bureau Group Co.Ltd,Tianjin,300222,China)

机构地区：[1]华南理工大学,国家金属材料近净成形工程技术研究中心,广州510641 [2]中铁十八局集团有限公司,天津300222

出　　处：《焊接学报》2025年第4期103-115,共13页Transactions of The China Welding Institution

基　　金：广东省基础与应用基础研究基金资助项目(2023A1515010384);华南理工大学中央高校基本科研业务费项目(2023ZYGXZR005)。

摘　　要：文中研究了添加Mn元素和Sn元素对低银Ag_(20)Cu_(3)5Zn_((43.5-x-y))Mn_(x)Sn_(y)Ni_(1.5)钎料显微组织、熔化特性以及润湿性能的影响,优化了钎料中Mn元素和Sn元素的含量.进而采用单辊急冷法制备了Ag20Cu35Zn31Mn10Sn2.5Ni1.5箔带钎料,并采用高频感应钎焊方法,研究了其在钎焊温度为790~870℃钎焊硬质合金YG15与42CrMo异质材料的连接效果.结果表明,随着Sn元素含量的增加,钎料合金中会形成体积分数较大的粗大脆性相,且脆性相的种类增加.Mn元素含量的增加引起钎料的脆硬相细化,固相线升高,熔化区间缩小,并且在YG15与42CrMo表面的铺展面积呈现先增加后减小的变化趋势.Sn元素和Mn元素的质量分数分别为2.5%和10%时,钎料具有较为优异的综合特性.采用Ag_(20)Cu_(35)Zn_(31)Mn_(10)Sn_(2.5)Ni_(1.5)箔带钎料在830℃时钎焊的YG15与42CrMo接头的抗剪强度最大,达到270.36MPa,与采用商用Ag30CuZn钎料的850℃钎焊接头的抗剪强度相当.剪切断裂在焊缝处,断口呈韧性断裂和部分脆性断裂的混合断裂.The influence of the addition of Mn and Sn elements on the microstructure,melting characteristics,and wettability of low-silver Ag_(20)Cu_(35)Zn(43.5-x-y)Mn_(x)Sn_(y)Ni_(1.5)brazing alloys was investigated,and the content of Mn and Sn elements in the brazing alloys was optimized.Subsequently,the Ag_(20)Cu_(35)Zn_(31)Mn_(10)Sn_(2.5)Ni_(1.5)foil-filler brazing alloy was prepared using a single roller cold method.Its performance in connecting YG15 cemented carbide and 42CrMo dissimilar steel material was then investigated through high-frequency induction brazing at 790~870℃.The results showed that an increase in Sn element content lead to the coarse brittle phases with a high volume fraction in the brazing alloy,and the types of the brittle phase were diversified.An increase in Mn element content caused the brazing alloys to undergo brittle phase refinement,elevation of the solidus,and a reduction in the melting range,displaying a trend of increasing and then decreasing surface areas of YG15 and 42CrMo.Optimal comprehensive properties of the brazing alloy are observed when the mass fraction of Sn and Mn elements was 2.5%and 10%,respectively.The joint shear strength between YG15 and 42CrMo brazed with Ag_(20)Cu_(35)Zn_(31)Mn_(10)Sn_(2.5)Ni_(1.5)foil-filler brazing alloy at a temperature of 830℃reached a maximum value of 270.36 MPa.The shear strength was comparable to that brazed with commercial Ag30CuZn brazing alloy at 850℃.The shear fracture was in the weld,and the fracture was a mixture of ductile fracture and partial brittle fracture.

关 键 词：低银钎料 钎焊性能 高频感应钎焊 硬质合金 抗剪强度 

分 类 号：TG454[金属学及工艺—焊接]