稀土对Sn-0.7Cu-0.075Al无铅焊料组织和可焊性的影响

发布时间：2018-02-10 00:16

  本文关键词： 稀土 无铅焊料 显微组织 熔化特性 润湿性　出处：《广西大学学报(自然科学版)》2017年02期 　论文类型：期刊论文

【摘要】：针对Sn-Al体系不易混熔的难点,通过粉末压片与真空电弧熔炼相结合的方法,成功制备了添加稀土的Sn-Cu-Al无铅焊料,并研究了添加微量单一稀土Ce、La和混合稀土RE对其显微组织和可焊性(熔化特性、润湿性)的影响。实验结果表明,不同稀土的添加均能使Sn-0.7Cu-0.075Al合金的组织均匀细化,单一稀土Ce、La的添加对基体合金的细化效果优于混合稀土RE的。单一稀土Ce、La的添加使基体合金的熔点从229.82℃分别降低到227.06℃和227.38℃,而混合稀土RE的添加对基体合金熔点影响不大,不同微量稀土的添加均略微降低了基体合金的熔程。不同微量稀土的添加均改善了基体合金的润湿性能。其中,单一稀土Ce的改善作用最明显,使基体合金铺展率从68.61%提升至73.88%,润湿角从34.6°下降到26.6°。
[Abstract]:Aiming at the difficulty of Sn-Al system being difficult to be mixed, Sn-Cu-Al lead-free solder with rare earth elements was successfully prepared by the method of powder pressing and vacuum arc melting. The effects of the addition of trace amount of rare earth cerium La and mixed rare earth RE on the microstructure and weldability (melting property, wettability) of Sn-0.7Cu-0.075Al alloy were studied. The experimental results show that the microstructure of Sn-0.7Cu-0.075Al alloy can be evenly refined by adding different rare earth elements. The addition of single rare earth cerium La has better refining effect than that of mixed rare earth RE alloy, and the melting point of the matrix alloy decreases from 229.82 鈩，

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