采用高能球磨的机械合金化法合成Sn-Cu二元合金超细粉体,对在球磨过程中粉体的结构演变、颗粒形貌、粒径分布及熔化特性进行了研究,讨论了合金化机制.结果表明:球磨粉体由Sn(Cu)过饱和固溶体及Cu6Sn5构成.在球磨初期,Cu、Sn颗粒相互迭加、冷焊,形成复合层块;随后,复合层块断裂碎化,球形颗粒相互团聚构成大的团粒;最后,团粒解散,小颗粒进一步细化.球磨60 h后,Sn-Cu合金粉体的平均粒径(d50)为1~3 μm,且随Cu含量由0.7 wt%增加到10 wt%,Sn-Cu合金粉颗粒形貌由不规则绒絮状变化到球状,熔点由231℃降低到288℃.
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