摘要
通过向Ag17CuZnSn钎料中复合添加微量的Ga和稀土元素Ce,研究了Ga和Ce元素的复合添加对低银无镉钎料组织及焊接性能的影响。采用火焰钎焊方法得到黄铜与不锈钢异种金属钎焊接头。试验表明,随着Ga和Ce元素的添加低银钎料的固液相线温度不断下降。当Ga和Ce含量分别为2%和0.15%(质量分数)时,钎料在母材表面的铺展面达到最大值。Ga和Ce元素的复合添加对低银钎料中的CuZ n化合物相有明显的细化作用,黄铜与不锈钢钎焊接头的抗剪强度最大值为378.6 MPa。在钎焊过程中,钎缝与不锈钢母材之间发生了明显的元素扩散,Ga元素的扩散率大于其他元素。同时当低银钎料中的Ce元素含量大于0.3%时,钎料组织中出现了新生成的块状稀土相。
Effects of Ga and Ce additions on the microstructures and mechanical properties of Ag17 CuZnSn-x Ga-y Ce filler metals and brazed joint were investigated by SEM, EDS and tensile test. The results indicate that the solidus and liquidus temperatures of filler metals decrease with addition of Ga and Ce. And the wettability of filler metals on the brass and stainless steel improves when the content of Ga and Ce are 2 wt% and 0.15 wt%. The highest shear strength of brazed joint is 3% higher than the shear strength of the Ag17 CuZnSn-2 Ga. During brazing process, Ga has a higher diffusion coefficient into stainless steel than other elements. A novel Ce20(Ag, Cu)40Sn40 intermetallic phase is found in filler metal when the content of Ce is higher than 0.3 wt%.
作者
马超力
薛松柏
王博
龙伟民
钟素娟
Ma Chaoli;Xue Songbai;Wang Bo;Long Weimin;Zhong Sujuan(Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;The State Key Laboratory of Advanced Brazing Filler Metals & Technology,Zhengzhou Research Institute of Mechanical Engineering,Zhengzhou 450002,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2019年第1期91-96,共6页
Rare Metal Materials and Engineering
基金
National Natural Science Foundation of China(51375233)
State Key Laboratory of Advanced Brazing Filler Metals & Technology(Zhengzhou Research Institute of Mechanical Engineering)(SKLABFMT201704)
Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)
关键词
低银钎料
显微组织
稀土元素
抗剪强度
low-silver brazing filler metal
microstructure
rare earth element
shear strength
