Sn-Zn系和Sn-Cu系无铅焊锡的研制

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1、摘要铅及其合金有毒，随着立法限制和技术要求的提高，研制新型实用的无铅焊锡替代传统的Sn．Pb焊料成为近年来研究的热点。本文以Sn-9zn、sn-O．7cu为基，添加Bi、Al、Ag等合金元素，共研制了15种不同成分的无铅焊锡合金。通过熔点和力学性能的测定及铺展性、抗氧化性和电化学实验，考察了合金元素对研制的合金组织和性能的影响，结果表明：随Bi含量的增加，sn—zn共晶合金和sn—cu共晶合金的熔点下降，抗拉强度增加、铺展性改善，但是熔化温度区间将逐步增大、塑性降低、耐蚀性和抗氧化性降低；Ag使sn．z肿Bi系合金和sn．cu．B

2、i系合金抗拉强度提高，延伸率下降。少量的Ag对合金的熔点影响不明显。Ag的添加能提高Sn．zn．Bi系合金的抗氧化性和耐蚀性；Al的添加能提高Sn．zn共晶合金的抗拉强度，抗氧化性，但延伸率略有下降，不过均大于使用要求，即延伸率大于lO％。添加Re和zr不会生成高熔点相。Re的添加对合金耐蚀性的提高效果较好，zr的作用不太明显；Sn-9Zn一4Bi—O．5Ag、Sn-O．7Cu一5Bi和Sn-8．5Zn—O．878Al一0．122Re实验合金的综合性能较好。关键词：无铅焊锡、sn．zn共晶合金、sn．zn．Al合金、耐蚀性、sn．

3、Cu共晶合金性能ABSTRACTLead—tin(Pb—Sn)soldera110yshavebeenwidelyusedinthemodemelectronicsindustrybecausetheirlowmeltingpoints，goodwettability，goodcoⅡosionresistanceandreasonableelectricalconductivit弘However，duetothetoxicityofleadanditsalloys，increasingenvironmentalandhealthc

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