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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 effects of 28 representative trace elements on the melting point, flowability, corrosion resistance and brazing seam bending capacity of Al-Si eutectic solder were investigated. Among them, Al-Si (13.0) -Be (0.4-0.8) -Sr (0.03-0.06) -La (0.03-0.06) solder system is the most ideal. The paper also discussed the mechanism of solder corrosion on base metal, analyzed the influence of the brazing temperature and the composition of the brazing filler metal. In addition, it also considered that the speed of melting the base metal into the brazing material and the velocity of the liquid brazing material along the brazing seam , The greater the ratio of the two speeds, the more severe erosion. Finally, the brazing seam was heat-treated at different brazing temperatures for a short time and found that the strength and flexural resistance of the brazing seam were only marginally improved.