Ni元素对Zn-22Al药芯钎料用于Cu/Al钎焊接头组织和力学性能的影响  

Effect of Ni in Zn-22Al filler metal on the microstructure and mechanical properties of Cu/Al brazing joints

作　　者：王徐炳 黄魏青 王思鸿 卜永周 查心婧 刘薇[1] 沈杭燕[1] WANG Xubing;HUANG Weiqing;WANG Sihong;BU Yongzhou;ZHA Xinjing;LIU Wei;SHEN Hangyan(College of Materials Science and Chemistry,China Jiliang University,Hangzhou 310018,China;Hangzhou Huaguang Advanced Welding Materials Co,Ltd.,Hangzhou 311112,China)

机构地区：[1]中国计量大学材料与化学学院,浙江杭州310018 [2]杭州华光焊接新材料股份有限公司,浙江杭州311112

出　　处：《中国计量大学学报》2024年第3期487-495,共9页Journal of China University of Metrology

基　　金：浙江省自然科学基金项目(No.Q24E040003)。

摘　　要：目的:研究Ni元素对Zn-Al药芯焊丝熔化特性、铺展性能的影响。方法:在钎剂中添加一定比例的Ni粉,在钎焊过程中形成Cu/Al接头的Ni合金化,分析不同含量Ni元素添加对Zn-22Al钎料以及Cu/Al异种合金钎焊接头的性能及显微组织的影响。结果:Ni粉添加可使Zn-22Al钎料在Al板上的铺展性能得到提升,当添加量质量分数为5%时钎料铺展性能提升26.75%;当添加量质量分数为7%时,用于Cu/Al钎焊的接头抗拉强度相较于未添加Ni粉焊接接头强度提升61.79%。结论:Ni粉添加可有效改善Zn-22Al焊缝的显微组织,体现为主晶相的细化,富Zn边界相的减少,促进主晶团之间形成层片状共析组织,以及减小了Cu侧生成的铜铝金属间化合物脆性相的厚度。Aims:To study the the influence of Ni on the melting characteristics and spreading performance of Zn-Al cored welding wire.Methods:Add Ni powder to the brazing flux to complete Ni in-situ alloying in Cu/Al joints during the brazing process.Then analyze the effects of the different Ni contents addition on the properties and microstructure of Cu/Al dissimilar alloy joints brazed with Zn-22Al brazing material.Results:Ni addition significantly enhanced the spreadability of Zn-22Al filler metal on Al substrate and the tensile strength of joints used for Cu/Al brazing.The spreadability of brazing materials is improved by 26.75% when Ni addition amount is 5%,and the tensile strength of Cu/Al brazed joint also increased by 61.79% when Ni addition amount reached 7%.Conclusions:Ni powder addition effectively improved the microstructure of the Zn-22Al seam,leading to the refinement of the primary phase,the reduction of Zn-rich boundary phase,the formation of lamellar eutectoid microstructure between primary grains,as well as the thickness of brittle intermetallic compounds layer formed on the Cu side.All these microstructure changes contribute to the improvement of Cu/Al joint strength.

关 键 词：ZN-AL钎料 Ni原位掺混 铜铝异种接头 力学性能 显微组织 

分 类 号：TG425[金属学及工艺—焊接]