(华东船舶工业学院 焊接技术与工程系， 镇江 212003)
摘 要: 在钎焊温度高于SiCp/LY12复合材料起始熔融温度的条件下， 采用Al-28Cu-5Si-2Mg钎料在真空中仍能实现对SiCp/LY12复合材料的钎焊连接。 研究结果表明：SiCp/LY12复合材料的熔化特性、 快速的钎焊热循环和钎料中含合金元素Mg是实现对SiCp/LY12复合材料的钎焊连接的主要因素。 分析了SiCp/LY12复合材料钎焊连接强度的影响因素和界面特征。 提高液态钎料对SiC的润湿性、 降低连接区的弱连接比例、 减少过渡到钎缝中的SiC颗粒， 是改善钎焊连接强度的重要途径。
关键字: 铝基复合材料； 真空钎焊； 接头强度
（Department of Welding Technology and Engineering,
East China Shipbuilding Institute, Zhenjiang 212003, China）
Abstract: The vacuum brazing of SiCp/LY12 by using filler metal of Al-28Cu-5Si-2Mg is feasible, though brazing temperature is higher than the incipient melting temperature of SiCp/LY12. The effects of joint strength and interface character in SiCp/LY12 matrix composite bonding were discussed in detail. The results show that viable brazing of SiCp/LY12 is lain on its melting characteristic, fast braze thermal cycle and action of Mg in the filler metal. The key methods of improving the joint strength are to raise the wettability of filler metal on SiC substrates, to decrease the proportion of feeble bonding in interfacial region and to reduce SiC particulates transited to brazing seam.
Key words: aluminum matrix composites; vacuum brazing; joint strength
