SiC_p/ZL101复合材料与可伐合金4J29钎焊的分析

Brazing of aluminum matrix composites SiC_p/ZL101 to Kovar alloy 4J29

以增强相体积分数为55%的SiCp/ZL101复合材料和可伐合金4J29为母材,首先在复合材料表面电镀镍,然后在420℃保温7min的条件下,采用Zn-Cd-Ag钎料对SiCp/ZL101复合材料与可伐合金进行了保护气氛钎焊试验.利用扫描电镜及EDS能谱分析的方法对接头的界面组织及断口形貌进行了研究.结果表明,经过镀镍提高了钎料对复合材料的润湿性,钎焊过程中钎料与可伐合金、钎料与镀层界面处均形成了过渡层,镀层与复合材料通过扩散形成了冶金结合.断口分析表明,钎焊接头的断口位于复合材料内部,但离镀层较近.

SiCpZL101 composites containing 55% SiCp and Kovar alloy 4J29 were chosen as base metals.After being e-lectroplated by Ni on the SiCp/ZL101,the two materials were brazed by Zn-Cd-Ag as filler metal at the 420℃ for 7 min.Mo-reover,the interfacial microstructures and fracture appearances were investigated by SEM and EDS.The results show that the e-lectroplated Ni on the surface of SiC /ZL101 can improve the filler's wettability to the composite material.There are transition layers not only between the filler and Kovar alloy,but also be-tween the filler and the electroplated Ni layer,which shows the filler metal,the electroplated Ni layer,the composites and Kovar alloy can realize metallurgically joining by diffusion.The fracture analysis shows that the fracture happens inside the composites near the electroplated Ni layer.