材料期刊网

考察了28种有代表性的微量元素对Al-Si共晶钎料的熔点,流动性,抗腐蚀性以及钎缝折弯能力的影响。其中以Al-Si(13.0)-Be(0.4—0.8)-Sr(0.03—0.06)-La(0.03—0.06)钎料体系最为理想。本文还探讨了钎料对母材熔蚀的机理,分析了钎焊温度和钎料组成的影响,此外,还认为与母材熔入钎料的速度以及液态钎料沿钎缝的流布速度有关,此二速度的比值愈大,熔蚀愈烈。最后,在钎焊温度下对钎缝进行了不同时间的保温处理,发现钎缝的强度和抗弯能力仅有不大程度的改善。

The influence of 28 element additions on the melting point, flowability, corrosion resistance and fillet bending ability of A1-Si type filler metal has been investigated. Among these systems, filler 6M, i. e.A1-Si(13.0)-Be(0.4—0.8)-Sr (0.03—0.06)-La (0.03—0.06) is regarded as the optimum. The erosion mechanism of molten filler metal on base metal has been also studied. In addition to the influences of brazing temperature and the composition of filler metal, the rate of solution of base metal into molten filler and the spreading out of molten filler along the fillet are other of importance in affecting the erosion of base metal during brazing. The fillets were annealed for different time intervals and only a little improvement of their strength and bending capacity was observed.