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采用Al-Si-Cu-Mg-Ni五元合金钎料对60vol%SiC P/6063Al复合材料进行真空钎焊,研究了钎焊温度和保温时间对其接头剪切强度的影响,并利用金相显微镜、扫描电镜及能谱分析的方法对接头形貌及界面组织进行了观察分析。结果表明,随着钎焊温度和保温时间的增加,熔融钎料对复合材料的润湿性提高,钎料通过扩散与基体形成冶金结合,在565℃保温12 min后,接头剪切强度最大89.6 MPa,但在高温下随着保温时间的延长,钎缝中Mg元素蒸发聚集形成气孔,从而导致接头结合强度降低。
The effects of brazing temperature and holding time on the shear strength of 60vol% SiC P / 6063Al composite were investigated by using Al-Si-Cu-Mg-Ni five-component alloy brazing filler metal. Microscope, scanning electron microscopy and energy dispersive spectroscopy were used to analyze the morphology and interface structure of the joint. The results show that with the increase of brazing temperature and holding time, the wettability of the brazing filler metal to the composite increases, and the brazing filler metal forms a metallurgical bond with the matrix by diffusion. After shearing at 565 ℃ for 12 min, the shearing strength of the joint is 89.6 MPa, but at high temperature with the holding time prolongs, the Mg element in the brazing seam evaporates and accumulates to form pores, resulting in a decrease of the bond strength of the joint.