Cu基钎料钎焊紫铜的接头力学性能和微观组织.pdfVIP

第 20 卷第 1 期 粉末冶金材料科学与工程 2015 年 2 月 Vol.20 No.1 Materials Science and Engineering of Powder Metallurgy Feb. 2015 Cu 基钎料钎焊紫铜的接头力学性能和微观组织 瞿智明，张福勤，夏莉红 ( 中南大学 粉末冶金国家重点实验室，长沙 410083) 摘 要：通过感应熔炼方法制备 Sn 含量不同的 Cu 基钎料，在不同工艺条件下对紫铜进行钎焊。采用 DTA 、XRD 、 SEM 和拉伸性能测试等手段研究不同 Sn 含量的 Cu-P-Ag 钎料和钎焊工艺对紫铜焊接接头性能的影响，比较 Sn 含量对焊料的熔点和焊接性能的影响，考察在 630、670 和 730℃不同温度条件下以及不同 Sn 含量的钎料对焊接 接头力学性能的影响。结果表明：适量的 Sn 含量和合理的焊接工艺可以改善焊接接头的微观组织，从而增强焊 接接头的力学性能，在 Sn 含量为 6%时钎料的焊接性能最好，抗拉强度达到210.32 MPa ，经 670 ℃焊接后可得到 结合较为良好的焊接接头。 关键词：Cu 基钎料；钎焊；力学性能；熔化温度 中图分类号：TG454 文献标识码：A 文章编号：1673-0224(2015)1-133-06 Mechanical properties and microstructure of copper brazing using Cu-based alloy as filler QU Zhi-ming, ZHANG Fu-qin, XIA Li-hong (State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China) Abstract: Copper was brazed using Cu-based alloy filler with different Sn contents prepared by vacuum induction melting. Differential thermal analysis (DTA), X-Ray diffraction (XRD), scanning electron microscope (SEM) and mechanical testing were used to studied the effects of different Sn contents and welding procedures on mechanical properties and microstructure of welding joints. The welding performances of filler with different Sn contents were also studied. Besides, the impacts of brazing temperatures of 630, 670, 730 ℃ on welding joints’ properties were discussed. The results indicate that an appropriate amount of Sn and a reasonable welding procedure can induce welding joints’