摘要
采用化学镀方法在BAg45CuZn钎料表面镀覆微米锡层,并用镀锡银钎料以火焰钎焊工艺连接H62黄铜。借助金相显微镜、扫描电镜(SEM)和X射线衍射仪(XRD)分别分析锡化学镀层、H62黄铜钎焊接头的显微组织和物相,并利用万能拉伸机和SEM表征钎焊接头的抗拉强度和断口形貌。结果表明,锡化学镀层结晶晶粒呈现明显的(110)、(210)择优取向,化学镀锡银钎料连接的接头中母材与钎缝结合紧密,接头组织中富Cu相减少,出现Cu_5Zn_8化合物相。随着基体钎料表面镀锡含量升高,钎焊接头的抗拉强度呈现先升高后降低趋势。在化学镀锡含量为6.0%(质量分数)时,钎焊接头的抗拉强度为353MPa。镀锡前后钎焊接头的拉伸断口均呈现韧性断裂。
H62 brass joints were brazed using BAg45CuZn brazing filler metals plated tin coatings. SEM and XRD were used to observe the surface microructure and phase of tin coatings and H62 brass brazed joint. The tensile strength of H62 brass brazed joints was analyzed using tensile test machine. The results show that the crystallization orientation of tin coating displays （110） and （210） crystal faces. The interface brazing seam and H62 brass produce sound brazed joints aRer tin electroless plated on filler metal. Then Cu-rich phase in the microstructure of brazed joints decreases, but the CusZn8 intermetallic compound appears. The tensile strength of brazed joints initially increases and then decreases with increasing of plating tin content. When the content of tin electroless plated coating is 6.0wt%, the maximum tensile strength of brass brazed joints is 353 MPa. The fracture morphology of brazed joints using filler metal with tin coatings exhibits ductile fracture, the same as the joints using the BAg45CuZn brazing filler metal.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2018年第1期367-370,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51301070)
河南省产学研合作计划(150042)
华北水利水电大学博士基金
关键词
镀锡银钎料
钎焊
显微组织
抗拉强度
silver brazing filler metal with tin coating
brazing
microstructure
tensile strength
