(華東船舶工業(yè)學(xué)院 焊接技術(shù)與工程系， 鎮(zhèn)江 212003)
摘 要: 在釬焊溫度高于SiCp/LY12復(fù)合材料起始熔融溫度的條件下， 采用Al-28Cu-5Si-2Mg釬料在真空中仍能實(shí)現(xiàn)對(duì)SiCp/LY12復(fù)合材料的釬焊連接。 研究結(jié)果表明：SiCp/LY12復(fù)合材料的熔化特性、 快速的釬焊熱循環(huán)和釬料中含合金元素Mg是實(shí)現(xiàn)對(duì)SiCp/LY12復(fù)合材料的釬焊連接的主要因素。 分析了SiCp/LY12復(fù)合材料釬焊連接強(qiáng)度的影響因素和界面特征。 提高液態(tài)釬料對(duì)SiC的潤(rùn)濕性、 降低連接區(qū)的弱連接比例、 減少過(guò)渡到釬縫中的SiC顆粒， 是改善釬焊連接強(qiáng)度的重要途徑。
關(guān)鍵字: 鋁基復(fù)合材料； 真空釬焊； 接頭強(qiáng)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
