铜管/铝阀体异种材料炉中钎焊技术研究  

Study on brazing technology of copper/aluminum furnace for shut-off valve

作　　者：张坤 董洪波[1] 石尚 刘伟利 

机构地区：[1]南昌航空大学航空制造工程学院,江西南昌330063 [2]江西鸥迪铜业有限公司,江西上饶334400

出　　处：《焊接技术》2018年第6期41-44,共4页Welding Technology

基　　金：南昌航空大学研究生创新专项资金资助(校级项目)(YC2017016)

摘　　要：采用Al-Zn-Si-Cu-Sn系钎料在不同温度下进行铜/铝炉中钎焊试验,测试了不同温度下表面质量及气密性,并通过金相观察及EDS扫描试验分析了试样钎缝中心区显微组织。试验结果表明,较理想的钎焊温度在560~580℃,在此温度区间2组试样表面质量良好,且高、低压环境下气密性良好,铜侧与钎料界面处金属化合物主要是Cu Al2,且化合物层较薄,为6~7μm和4~5μm,钎缝中心区为α-Al固溶体和Al-Zn共晶组织,未发现金属间化合物,铝侧与钎料出现熔合现象;低于此区间时,钎料出现未充分熔化和聚堆现象,表面质量差;高于此区间时,由于温度过高母材产生溶蚀现象。从化合物层厚薄程度来看,570℃更适合该钎料铜/铝炉中钎焊。The Al-Zn-Si-Cu-Sn solder at five different welding temperatures of furnace brazing copper/aluminum welding quality were studied. The air tightness of the surface quality, high and low temperature environment of different welding specimen and the weld microstructure of welding specimens were tested. And the microstructure of weld center zone at different temperatures were analyzed by metallographic observation and EDS scanning experiment.The experimental results showed that the ideal welding temperature was between 560 ℃ and 580 ℃. In the range,welding qualities and the air tightness under high/low pressure environment was qualified. The main metal compound at the interface between copper and solder was Cu Al2 which the thickness of compound layer was about 6～7 μm and 4～5 μm. In the zone of weld center, α-Al solid solution and Al-Zn eutectic structure were found. Besides there was no intermetallic compound. The fusion phenomenon appeared between aluminum side and solder. Below the temperature range, the solder was not fully melted and piled up, then the surface quality of the welding parts was poor. Above the temperature range, corrosion of aluminum base metal appeared due to the high temperature.According to the thickness of compound layer, 570 ℃ was more suitable for brazing in furnace.

关 键 词：铜/铝炉中钎焊 气密性分析 焊缝显微组织 

分 类 号：TG454[金属学及工艺—焊接]