Ga_2O_3对CsF-RbF-AlF_3钎剂/Zn-Al钎料在铝和钢表面润湿铺展性能的影响  

Effect of Ga_2O_3 on the Wettability and Spreadability of CsF-RbF-AlF_3 Flux/Zn-Al Filler Metal on Aluminum and Steel

作　　者：张俊雄[1] 薛松柏[1] 薛鹏[1] 杨金龙[1] 吕兆萍[1] 

机构地区：[1]南京航空航天大学,江苏南京210016

出　　处：《稀有金属材料与工程》2017年第7期1900-1904,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51375233);江苏高校优势学科建设工程资助项目

摘　　要：研究了添加微量Ga_2O_3的CsF-RbF-AlF_3钎剂和Zn-Al钎料在6063铝合金和Q235低碳钢上的润湿、铺展性能的反应规律。结果表明,添加极微量的Ga_2O_3即能够显著促进Zn-Al钎料在6063铝合金和Q235低碳钢上的润湿、铺展,其最佳添加量应控制在0.001%~0.003%(质量分数)。对钎剂残渣的XRD分析结果和化学反应热力学计算表明,微量Ga_2O_3的添加,一方面能够促进CsF-RbF-AlF_3钎剂溶解、反应去除6063铝合金和Q235低碳钢表面的氧化膜;另一方面,在钎焊过程中,由于Ga_2O_3被还原成金属Ga,Ga元素具有"集肤效应",富集于钎料和母材的界面,大大降低了钎料与母材间的界面张力,从而促进了钎料在母材上的润湿、铺展。Effects of a trace amount of Ga_2O_3 addition on the changes of the wettability and spreadability of CsF-RbF-AlF_3 flux and Zn-Al filler metal were investigated on 6063 aluminum alloy and Q235 low-carbon steel. The results indicate that a trace amount of Ga_2O_3 addition in the flux could obviously promote the Zn-Al filler metal to wet and spread on the surface of 6063 aluminum alloy and Q235 low-carbon steel, and the optimum range of Ga_2O_3 is 0.001%~0.003%. According to the XRD results of the flux residua and the thermodynamic calculation, it is concluded that the trace amount of Ga_2O_3 addition can enhance the solubility and reactivity of CsF-RbF-AlF_3 flux to the surface oxides on 6063 aluminum alloy and Q235 low-carbon steel. On the other hand, Ga_2O_3 is also reduced to Ga. Because of its skin effect, Ga is enriched on the interface of filler metal and base metal and effectively decreases its interfacial tension, thus improving the wettability and spreadability of the filler metal.

关 键 词：润湿 铺展 GA2O3 CsF-RbF-AlF3钎剂 

分 类 号：TG425[金属学及工艺—焊接]