快速凝固Al-Si-Cu基钎料的性能

利用单辊急冷设备，制得了厚度为70～100μm的三种Al-Si-Cu薄带钎料。根据DTA测定结果，该快冷钎料液相线降低3～5℃。快冷钎料与普通钎料的润湿性和接头抗拉强度测定结果表明，快冷钎料润湿系数提高20％，抗拉强度提高30％。分析钉料和钎焊接头的微观组织可以发现，快冷钎料晶粒尺寸在0．6μm以下，元素分布均匀，在钎焊过程中与母材扩散性能好，有利于提高润湿性和接头抗拉强度。采用快速凝固制备薄带钎料，不仅工艺简单，且可获得性能更优良的钎料，并可用于开发新颖钎料。

Properties of melt-spun Al-Si-Cu brazing foils

Three kinds of AlSiCu alloys were melt spun into ribbons of about 70100u,m thickness. According to the results of differential thermal analysis, the melting point of these brazing foils is 3~5Tl lower than ascasting brazing rods. Compared with as casting brazing rods of compositions similar to the ribbons studied here, the wetting factor and tensile stress of joints are about 20% and 30% higher than as-cast brazing rod, respectivly. Analyzed the rnicrostructure characteristics of bra/ing alloy and brazed joints, it has been found that the size of grain of ribbons is smaller than 0.6 u, m. The chemical and microstructural homogeneity of brazing ribbons result in narrow point ranges, higher strength and corrosion resistance of brazing joints, as well as improving wettability.