钎焊工艺对Ni/BNi7+Cu9%钎缝组织及显微硬度的影响  

Phase-Structures and Micro-Hardness of Vacuum Brazed Joint of Pure Ni with BNi7+Cu9% Solder

作　　者：史海川[1] 于治水[1] 张培磊[1] 褚振涛[1] 卢云龙[1] 马凯[1] 

机构地区：[1]上海工程技术大学材料工程学院,上海201600

出　　处：《真空科学与技术学报》2015年第3期367-371,共5页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然基金项目(51375294);上海市教委创新项目(12ZZ186;14YZ139);上海市自然基金项目(12ZR1444500);上海市科委地方高校能力建设项目(13160501200);上海工程技术大学校基金项目(2012gp21)

摘　　要：为了改善Ni基钎料钎焊接头脆硬的共晶组织,本文采用BNi7+9%Cu复合钎料对纯镍进行真空钎焊。结果表明:温度越高,间隙越大,扩散影响区越大,钎缝区显微硬度越低,扩散影响区显微硬度越高。当钎焊接头间隙为30μm,温度960℃时,钎缝接头主要由等温凝固区、非等温凝固区和扩散影响区组成。等温凝固区为富(Cr、Cu)的γ(Ni)固溶体,非等温凝固区为γ(Ni)+Ni3P共晶组织,扩散影响区为少量的共晶组织和γ(Ni)固溶体;而温度980℃时,钎焊接头是由中心的Ni3P组织和扩散影响区的γ(Ni)固溶体组成。当钎焊接头间隙为100μm时,其扩散影响区的范围要比30μm的大,在960℃时,钎缝填充不好,有很多孔洞。Here, we addressed vacuum brazing of pure Ni with BNi7 ＋ 9% solder. The impact of the brazing condi- tions on the phase-structures and micro-hardness at the joint were investigated with X-ray diffraction, energy dispersive spectroscopy, scanning electron microscopy, and mechanical probes. The results show that the brazing temperature and gap-width strongly affect the joint hardness. For example, as the temperature and gap width increased, the hardness be- came stronger at the joint, but weaker in the increased diffusion zone. When 30 μm wide gap was brazed at 960℃, the joint roughly consisted of three zones：the isothermally solidified zone with （Cr, Cu）-rich solid solution of 7（Ni） ;the non- isothermally solidified zone with γ（Ni） ＋ Ni3P eutectic;and the diffusion zone with small amount of eutectie and γ（Ni） solid solution. At 980℃, the joint consisted of Ni_3P eutectic at the center and γ（Ni） solid solution in the diffusion zone. Brazed at 960℃ ,the diffusion zone of 100 μm gap was wider than that of 30 tan gap,and holes in the idler metal resulted in a poor brazing.

关 键 词：复合钎料 真空钎焊 钎焊间隙 固溶体 共晶组织 显微硬度 

分 类 号：TG454[金属学及工艺—焊接]