针对Al熔液在850℃以下不润湿Al2O3而难以直接钎焊的困难,本工作研究了溅射Al对Al2O3的“润湿”作用,提出了一种采用溅射Al基薄膜作为钎料直接钎焊Al2O3的方法.结果表明,这种方法可以在不满足熔态Al润湿条件的680℃实现Al和Al-Cu合金对Al2O3的直接真空钎焊,并且仅需0.1 Pa的真空度.所获得的Al/Al2O3的接头剪切强度达到115MPa,Al-1.6at％Cu合金钎焊接头的剪切强度可提高到163MPa,当钎料中的Cu含量提高至14.3at％后,钎焊接头中焊缝与陶瓷界面产生Cu的偏聚,接头的剪切强度因界面断裂降低为127MPa.并对这种不基于金属熔态润湿钎焊方法的原理进行了分析讨论.
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