SiC颗粒增强铝基复合材料的钎焊性  

Brazability of SiC Particulate Reinforced Aluminium Metal Matrix Composites

作　　者：王少刚[1] 刘红霞[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京210016

出　　处：《材料科学与工程学报》2009年第2期186-189,265,共5页Journal of Materials Science and Engineering

基　　金：江苏省自然科学基金资助项目(BK2002094)

摘　　要：采用氩气保护炉中钎焊和真空钎焊两种试验方法,对SiCp/101Al复合材料的钎焊性进行研究。结果表明,通过选择合理的钎料和钎剂及采用正确的钎焊工艺参数,可以实现对SiCp/101Al复合材料的钎焊连接。对获得接头进行力学性能测试,表明钎焊接头的剪切强度随钎焊温度的升高而升高,当达到一定值以后,又随着钎焊温度的升高而降低。对接头钎缝区的XRD相结构分析中发现,接头中含有Al-Cu、Al-Si共晶组织相,并且有SiC相存在,说明母材中有部分SiC增强相颗粒过渡到了钎缝之中,有利于提高钎缝接头的力学性能。从钎焊接头的断口扫描照片中可以看出,接头大部分都呈韧性断裂特征,且大多数接头都断裂于靠近钎缝的母材部位,说明钎焊接头的质量较高,钎焊工艺可行。The brazability of SiC particulate reinforced 101 aluminium alloy by means of both furnace brazing in controlled atmosphere and vacuum brazing is studied. Results show that brazed joint with good quality can be got hy using the reasonable brazing filler metal and proper brazing flux and optimized brazing technology parameters. Mechanical property tests reveal that the brazed joint shear strength increases with the increase of brazing temperature, however, it gradually decreases when it attains the maximum value. XRD phase analysis indicates that there are Al-Cu, Al-Si eutectic, and SiC phases in brazed joint, and that some SiC reinforced particles have been transited to brazing seam, which is advantageous to improve the joint mechanical properties. SEM photos show that most joint fracture is tough, and located in base material near brazing seam, which demonstrates that the quality of SiCp/Al composites brazed joints is high and the brazing technology is feasible.

关 键 词：铝基复合材料 钎焊 剪切强度 SEM XRD 

分 类 号：TG454[金属学及工艺—焊接]