BAg17CuZnSn-xCe钎料组织及性能分析

Study on microstructure and properties of BAg17CuZnSn-xCe filler metals

摘要: 通过向BAg17CuZnSn钎料中添加微量的稀土元素Ce，研究了微量Ce元素的添加对低银钎料组织及焊接性能的影响.结果表明，当Ce元素质量分数为0.15%时，BAg17CuZnSn-0.15钎料在黄铜和不锈钢母材表面铺展面积较BAg17CuZnSn钎料分别提高了12.1%和37.4%，钎焊接头的抗剪强度达到最大值340.2 MPa.随着Ce元素的添加，钎料的自腐蚀电位逐渐正移，钎料的耐腐蚀性能得到提升.Ce元素对BAg17CuZnSn-xCe钎料基体中的CuZn化合物相有明显的细化作用，当Ce元素质量分数为0.15%时，钎料组织最为细小、均匀.但是当Ce元素质量分数达到0.5%时，钎料中出现了Ce-Sn化合物相.

Abstract: Ce was introduced into BAg17CuZnSn filler metals, and the effect of Ce content on microstructure and brazing properties of low silver filler metals were studied. The results show that the spreading area on brass and stainless steel increase 12.1% and 37.4%, respectively with 0.15% Ce addition. The maximum shear strength of brazing joint could reach 340.2 MPa using BAg17CuZnSn-0.15Ce filler metal. The anticorrosion ability of BAg17CuZnSn-xCe filler metals is improved with increasing Ce content. The BAg17CuZnSn-xCe filler metals show finer and more uniform microstructure when the content of Ce is 0.15%. However, some Ce-Sn intermetallics phases occurred in the filler metals when the Ce content reaches 0.5%.