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研究了真空钎焊时在钎料中加入微量稀土元素Ｌａ、Ｃｅ，能显著提高Ａ１－Ｓｉ基钎料对ＬＤ３０铝 合金的润湿性和真空钎焊接头质量；明显改善钎缝微观组织，使晶粒细化，并使中间相分布更均匀， 改变第二相ＣｕＡｌ_２、Ｍｇ_２ Ｓｉ的网状分布，使之变薄变细；促进铝合金基体与钎料中合金元素的相互 扩散和均匀分布；从而使钎焊接头强度明显提高．
The addition of trace rare earth elements La and Ce into the brazing filler metal during vacuum brazing can significantly improve the wettability of the aluminum alloy and the quality of the brazed joints. The microstructure of the brazing seam is obviously improved. Grain refinement and more uniform distribution of the intermediate phase, changing the network distribution of the second phase CuAl_2, Mg_2 Si thinning and thinning; Promote mutual diffusion and uniform distribution of alloying elements in the aluminum alloy matrix and brazing filler metal; So that the strength of brazed joints increased significantly.