热浸镀锡铜磷钎料的性能  

Properties of Cu-P Brazing Filler Metal After Hot-Dip Tinning

作　　者：董博文 钟素娟 裴夤崟 沈元勋 龙伟民 Dong Bowen;Zhong Sujuan;Pei Yinyin;Shen Yuanxun;Long Weimin(State Key Laboratory of Advanced Brazing Filler Metals&Technology,Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd,Zhengzhou 450001,China)

机构地区：[1]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,河南郑州450001

出　　处：《稀有金属材料与工程》2021年第10期3527-3531,共5页Rare Metal Materials and Engineering

基　　金：Science and Technology Major Project of Zhengzhou City(2019CXZX0065);Leading Talents of Science and Technology in Central Plains(ZYQR20180030)。

摘　　要：以Cu93P钎料为基体,在其表面热浸镀锡,制备CuPSn钎料,采用扫描电镜、万能力学试验机、显微硬度计、差热分析仪、箱式电阻炉和体视显微镜分析锡镀层的界面形貌,钎料的抗拉强度、显微硬度、熔化温度和润湿性。结果表明:在Cu93P钎料表面热浸镀锡过程中,液态锡与钎料发生了界面反应,生成Cu_(6)Sn_(5)金属间化合物,即钎料基体与锡镀层形成良好的冶金结合;随着热浸镀温度的升高和时间的延长,CuPSn钎料的抗拉强度和显微硬度均呈降低趋势,抗拉强度的降低源于界面处产生的Cu_(6)Sn_(5)脆性化合物和孔洞,显微硬度的降低源于热浸镀的去应力退火作用;Cu93P钎料表面热浸镀锡可降低钎料的熔化温度,提高钎料的润湿性,Cu93P钎料表面热浸镀5.20%(质量分数)锡之后,Cu88.16P6.648Sn5.20在纯铜板上的润湿铺展面积比基体Cu93P钎料增加43.15%。The CuPSn brazing filler metal was prepared on the basis of Cu93 P brazing filler metal by hot-dip tinning.The interface morphology of tin coating was observed by scanning electron microscope.The tensile strength,micro hardness,melting temperature and wettability of the brazing filler metal were investigated by universal mechanical testing machine,micro-hardness tester,differential thermal analyzer,resistance furnace and stereomicroscope.The results indicate that the liquid tin reacts with the brazing filler metal to form Cu_(6)Sn_(5)intermetallic compound during hot-dip tinning,which means that the brazing filler metal and tin coating form good metallurgical bonding.The tensile strength and microhardness of brazing filler metal decrease with the increase of hotdipping temperature and time.The decrease of tensile strength is due to the formation of Cu_(6)Sn_(5)brittle compound and pores at the interface,and the decrease of microhardness is due to the stress-relieving annealing effect of hot-dip.Hot-dip tinning can reduce the melting temperature and improve the wettability of the brazing filler metal.The wetting area of brazing filler metal increases by about43.15%compared with that of the matrix when 5.20 wt%tin is hot dipped in it,and the Cu88.16 P6.64 Sn5.20 brazing filler metal possesses a good wettability.

关 键 词：热浸镀 化学亲和力 熔化温度 润湿性 

分 类 号：TG425[金属学及工艺—焊接]