含银20%的银基无镉中温钎料配方的优化设计

Optimum design of cadmium-free silver-based filler metal contaed 20%Ag

摘要: 基于对银基钎料的熔化温度以及组成相的要求,依据有关相图优化计算钎料配方,并通过液相面投影图和相分布投影图对得到的结果进行调整和讨论,最后得到了元素的最佳成分范围:19%~20%Ag,38.2%~42.9%Cu,31%~33%Zn,4.5%~6.5%Sn。由微观组织和X射线衍射分析表明,钎料主要由共晶相(富Cu相和CuZn化合物相)、锡青铜相和银固溶体相组成,同时经优化设计得到的钎料在熔化温度和接头强度上与BAg30CuZnSn钎料相当。

Abstract: According the demand of the melting temperature and distribution phase of silver-based filler metal, the content of each element is calculated and optimized by phase diagram, then the result is adjusted and discussed according to the distribution phase and temperature of filler metal, and the optimal range of each element is as following:Ag:19%-20%, Cu:38.2%-42.9%, Zn:31%-33%, Sn:4.5%-6.5%, respectively.By the analysis of microstructure and X-ray diffraction, the silver-based filler metal is consisted of eutectic structure, tin bronze and silver solid solution, and its melting temperature and strength can be equivalent to that of the BAg30CuZnSn filler metal.