基于熵模型镀锡银钎料钎焊性能的定量表征  

Quantitative characterization of brazability for Sn-plated Ag brazing filler metals based on entropy model

作　　者：王星星[1] 上官林建[1] 何鹏[2] 龙伟民 武胜金 WANG Xingxing;SHANGGUAN Linjian;HE Peng;LONG Weimin;WU Shengjin(North China University of Water Resources and Electric Power,Zhengzhou,450045,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin,150001,China;State Key Laboratory of Advanced Brazing Filler Metals and Technology,Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd.,Zhengzhou,450001,China)

机构地区：[1]华北水利水电大学,郑州450045 [2]哈尔滨工业大学,先进焊接与连接国家重点实验室,哈尔滨150001 [3]郑州机械研究所有限公司,新型钎焊材料与技术国家重点实验室,郑州450001

出　　处：《焊接学报》2020年第1期18-22,I0002,共6页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51705151);中国博士后基金面上资助项目(2019M662011);河南省科技创新人才计划项目(中原学者)(172101510003);河南省产学研合作计划资助项目(152107000072).

摘　　要：以BAg50CuZn钎料和BAg34CuZnSn钎料为基材,采用镀覆扩散组合工艺制备了两类镀锡银钎料,利用综合热分析仪、润湿试验炉、万能拉力试验机测定镀锡银钎料的熔化温度区间、润湿面积及钎焊接头抗拉强度,建立了钎料润湿熵和接头强度熵的数学模型,并与熔炼合金化制备的相同Sn含量的传统钎料进行对比.结果表明,与相同Sn含量的传统钎料相比,镀锡银钎料的润湿熵值更小、强度熵值略高.同等Sn含量条件下,镀锡银钎料和传统钎料润湿熵值的变化趋势,与对应钎料在316LN不锈钢表面的润湿面积随Sn含量的变化趋势基本一致,强度熵值的变化趋势与对应钎料钎焊316LN不锈钢接头的抗拉强度随Sn含量的变化趋势几乎吻合;润湿熵和强度熵的模型在一定程度上可定量预测镀锡银钎料的钎焊工艺性和接头力学性能.Two types of Sn-plated AgCuZnSn brazing filler metals were prepared by a combinative process of electroplating and thermal diffusion using BAg50CuZn and BAg34CuZnSn brazing filler metal.The comprehensive thermal analyzer,wetting test furnace and universal tensile testing machine were applied to analyze the melting temperature range,wetting area and tensile strength.The mathematical model of the filler metals wetting entropy and the joint strength entropy were established,and compared with the traditional brazing filler metal prepared by melting alloying under the same condition of Sn content.The wetting entropy of the Sn-plated Ag brazing alloys are smaller than the traditional brazing filler metals,and its joint strength entropy value is slightly higher than the latter.The wetting entropy value of the Sn-electroplated brazing alloys and traditional filler metal are similar to the change trend of the wetting area for those filler metals on the surface of the 316LN stainless steel.The change trend of the brazed joint strength entropy value with those filler metals are basically the same as the tensile strength of the 316LN stainless steel joint with the increase of the Sn content.The experimental results show that the mathematical model of the wetting entropy and the joint strength entropy can quantitatively predict the brazing process and mechanical properties of the Sn-electroplated Ag brazing alloys to a certain extent.

关 键 词：镀锡银钎料 润湿熵 强度熵 润湿面积 抗拉强度 

分 类 号：TG454[金属学及工艺—焊接]