微量In对AgCuZn钎料组织和性能的影响

研究了不同In含量银钎料的熔化温度、铺展性能、钎料显微组织以及钎缝力学性能的变化规律.以紫铜、黄铜为母材,采用火焰钎焊方法,用对接和搭接接头形式进行钎焊试验.结果表明,在银钎料中添加微量In元素,能够降低钎料的熔化温度,改善钎料的铺展性能,并显著改变钎料显微组织.对于黄铜对接来说,钎焊接头的抗拉强度,随银钎料中In含量的增加而呈抛物线方式增加;除黄铜对接接头外,其它形式的接头断裂位置均在母材上,说明含In银钎料的力学性能优良.

Effects of trace indium on properties and microstructure of Ag-Cu-Zn filler metal

Melting temperature, spreadability, microstruc-tures of silver filler metal bearing different content of indium,and the mechanical properties of brazed joints were studied respectively. By using copper and brass plates as base metal, brazing with flame method, the mechanical properties of the joints brazed with lap-joint and butt joint were tested and analyzed at the same time. Results show that adding indium can decrease the melting temperature and improve the spreadability of the silver filler metal, and the micro-structures of the silver filler metal bearing different content of indium are refined significantly. For the lap-joint of brass, the tensile strength of the joints gradually strengthens, presenting parabolic shape, with the increasing of the element indium; the fractures position of two kinds of brazed joints happens on the base metal, except for the lap-joint of brass, which shows better mechanical properties of the joints brazed with the silver filler metals bearing indium.