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研究了低银Ag-Cu-Zn钎料(ωAg≤20%)的熔化特性、铺展性能、钎料显微组织。以黄铜/304不锈钢作为母材,采用火焰钎焊方法,进行了搭接钎焊试验。结果表明,低银Ag-Cu-Zn钎料显微组织主要由铜基固溶体、银基固溶体、Cu Zn化合物相构成。In的添加降低了Ag-Cu-Zn钎料的固、液相线温度,改善了钎料润湿性能;添加In的低银Ag-Cu-Zn钎料在凝固过程中析出富In的银基固溶体,起到了固溶强化的效果,改善了钎焊接头的显微组织,从而提高了钎缝接头的力学性能。使用17Ag Cu Zn-1In火焰钎焊黄铜/304不锈钢,钎焊接头成形美观、组织致密、无缺陷存在,综合性能与含银量为25%的BAg25Cu Zn Sn银钎料的性能相当,节银效果显著。
The melting characteristics, spreading properties and microstructure of the brazing filler metal were studied. Brass / 304 stainless steel as base metal, the use of flame brazing method, lap brazing test. The results show that the microstructure of low silver Ag-Cu-Zn solder consists of copper-based solid solution, silver-based solid solution and Cu-Zn compound phase. In addition, the addition of In reduced the solid and liquidus temperature of Ag-Cu-Zn solder and improved the solder wettability. In addition, Ag-Cu-Zn brazing filler metal containing In precipitated silver rich in Ag during the solidification Solid solution, played a solid solution strengthening effect, improve the microstructure of the brazed joints, thereby improving the mechanical properties of brazed joints. The use of 17Ag Cu Zn-1In flame brazing brass / 304 stainless steel, brazed joints beautifully formed, dense tissue, no defects exist, the overall performance and content of 25% of the BAg25Cu Zn Sn silver solder performance quite, section of silver Significant effect.