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采用Al-Si共晶(12wt%Si)体作为钎料、在不锈钢上镀镍层,在特定的工艺参数下,对6063铝合金和不锈钢进行接触反应钎焊。借助扫描电镜(SEM)、能谱分析(EPMA)及光学显微镜对界面区微观组织和工艺参数对镀Ni层的影响进行初步分析与探讨。结果表明:界面区组织主要由Al-Si固溶体、Al-Si共晶相和少量的Fe-Si-Al金属间化合物组成;当保温时间为5~15 min时镀Ni层变化不大,当保温时间为30 min时镀Ni层已明显变薄,因此随着保温时间的延长镀Ni层会逐渐变薄甚至完全消失,这时镀Ni层对原子之间相互扩散的阻挡作用会减弱甚至完全消失,所以合理的保温时间为5~15 min。
Al-Si eutectic (12wt% Si) was used as brazing filler metal, nickel plated on stainless steel and contact-brazed with 6063 aluminum alloy and stainless steel under specific process parameters. The effects of interface microstructure and process parameters on the Ni - plating layer were analyzed and analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EPMA) and optical microscopy. The results show that the microstructure of the interface zone is mainly composed of Al-Si solid solution, Al-Si eutectic phase and a small amount of Fe-Si-Al intermetallic compound. When the holding time is 5-15 min, the Ni plating layer does not change much. When the time is 30 min, the Ni layer is obviously thinned, so the Ni layer will gradually thin out or even disappear completely with the prolongation of the holding time. At this time, the Ni layer will have a weakened effect on the mutual diffusion of atoms or even disappear completely , So a reasonable holding time of 5 ~ 15 min.