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为了降低汽车铝质热交换器钎焊温度，防止高温软化，研究了一种钎焊温度比Ａｌ－Ｓｉ钎料低的Ｚｎ－Ａｌ－Ｃｕ钎料．着重讨论了微量Ｃｕ含量对Ｚｎ－Ａｌ钎料熔点、强度、钎焊性能等的影响．研究结果表明，在Ｚｎ－Ａｌ系钎料中加入微量的Ｃｕ，对钎料熔点无影响，其熔点均在三元合金共晶温度３７３．５℃左右；微量Ｃｕ在Ｚｎ－Ａｌ系合金中形成以Ｚｎ为基的含有铝和铜的η相（富锌相）固溶体及含锌和铜的β相（富铝相）固溶体，提高了Ｚｎ－Ａｌ系钎料的强度、硬度，但使其延伸率降低．该合金完全能替代Ａｌ－Ｓｉ系钎料用于汽车热交换器的钎焊，焊接温度可降低２００℃左右，可以防止因炉温偏高造成铝质热交换器钎焊时的高温软化现象．
In order to reduce the brazing temperature of automotive aluminum heat exchangers and prevent the high temperature softening, a Zn-Al-Cu brazing filler metal with lower brazing temperature than Al-Si brazing filler metal was studied. The effects of trace Cu content on the melting point, strength, brazing properties and so on of Zn-Al solder are mainly discussed. The results show that adding a small amount of Cu into the Zn-Al-based brazing filler metal has no effect on the melting point of the brazing filler metal, and the melting points thereof are all about 373.5 ° C in the ternary alloy. Trace amounts of Cu are formed in the Zn-Al-based alloy The Zn-based η-phase (zinc-rich phase) solid solution containing aluminum and copper and the β-phase (aluminum-rich phase) solid solution containing zinc and copper improve the strength and hardness of the Zn-Al-based brazing filler, Lower rates. The alloy can completely replace the Al-Si brazing filler metal for automobile heat exchanger brazing. The welding temperature can be reduced by about 200 DEG C to prevent the high temperature softening phenomenon caused by the aluminum heat exchanger brazing due to the high temperature.