Zn-Al钎料成分对Cu/Zn-Al/Al钎焊接头界面结构及性能的影响
羊 浩, 男, 1981年生, 博士生
修回日期: 2014-09-24
网络出版日期: 2015-03-25
基金资助
*广东省科技计划资助项目2010A080402014
INFLUENCE OF THE COMPOSITION OF Zn-Al FILLER METAL ON THE INTERFACIAL STRUCTURE AND PROPERTY OF Cu/Zn-Al/Al BRAZED JOINT
Revised date: 2014-09-24
Online published: 2015-03-25
Supported by
Supported by Guangdong Provincial Science and Technology Project (No.2010A080402014)
分别采用Zn-15Al, Zn-22Al, Zn-28Al, Zn-37Al和Zn-45Al钎料钎焊获得Cu/Al接头. 利用SEM, EDS和XRD研究了Zn-Al钎料成分对Cu/Al接头中Cu母材/钎缝界面结构的影响, 并系统阐述了Zn-Al钎料成分-接头界面结构-接头抗剪切强度之间的关系. 研究发现, Cu/Zn-15Al/Al接头中Cu母材/钎缝界面结构为Cu/Al4.2Cu3.2Zn0.7, 且Al4.2Cu3.2Zn0.7界面层较薄, 其厚度为2~3 μm, 接头具有较高的抗剪切强度, 达66.3 MPa. 随着钎料中Al含量的提高, 在Cu/Zn-22Al/Al接头界面处Al4.2Cu3.2Zn0.7界面层的厚度逐渐增大, 甚至在Cu/Zn-28Al/Al接头的Al4.2Cu3.2Zn0.7界面层附近出现少量的CuAl2, 接头的抗剪切强度逐渐降低. 当采用Al含量较高的Zn-37Al钎料钎焊Cu/Al接头时, Cu母材/钎缝界面结构转变为Cu/Al4.2Cu3.2Zn0.7/CuAl2; 脆性CuAl2层的出现, 使接头抗剪切强度大幅下降, 为34.5 MPa. 当采用Al含量最高的Zn-45Al钎料钎焊Cu/Al接头时, Cu母材/钎缝界面结构转变为Cu/CuAl2, 接头抗剪切强度最低, 为31.6 MPa.
羊浩 , 黄继华 , 陈树海 , 赵兴科 , 王奇 , 李德华 . Zn-Al钎料成分对Cu/Zn-Al/Al钎焊接头界面结构及性能的影响[J]. 金属学报, 2015 , 51(3) : 364 -370 . DOI: 10.11900/0412.1961.2014.00522
The Cu/Al dissimilar metal joint is a compound structure that can efficiently decrease manufacturing costs, reduce product weight, and integrate the advantages of both metals. For the excellent comprehensive properties, the Cu/Al dissimilar metal joint has broad application prospects in air conditioners, refrigerators, cables, electronic components, solar collectors, et al. Brazing is considered as a promising method to join the Cu/Al dissimilar metal for lower residual stress, lower costs, higher precision and better adaption to the structure of joint. Meanwhile, the Zn-Al filler metal is considered as the relatively ideal filler metal due to better property of the Cu/Zn-Al/Al joint. However, the influence of the composition of the Zn-Al filler metal on the interfacial structure near Cu substrate and property of the Cu/Al joint has not been investigated. In this work, the Cu/Al joints were brazed by Zn-15Al, Zn-22Al, Zn-28Al, Zn-37Al and Zn-45Al filler metals, respectively. The influences of the composition of Zn-Al filler metals on the interfacial structure near Cu substrate of the Cu/Al joints were investigated, and the relationships of the composition of the Zn-Al filler metals, the interfacial structure and the shear strength of the Cu/Al joints were described systematically. It was found that the interfacial structure of the Cu/Zn-15Al/Al brazed joint was Cu/Al4.2Cu3.2Zn0.7. For thinner Al4.2Cu3.2Zn0.7 layer (2~3 μm), the shear strength of the joint was higher (66.3 MPa). With the increase of Al content of the filler metal, the thickness of Al4.2Cu3.2Zn0.7 layer at the interface was increased for Cu/Zn-22Al/Al joint, even some CuAl2 phase can be found nearby the Al4.2Cu3.2Zn0.7 layer of Cu/Zn-28Al/Al joint, and the shear strength of the Cu/Al joints were decreased correspondingly. When the Cu/Al joint was brazed by the Zn-37Al filler metal, the interfacial structure near Cu substrate was transformed into Cu/Al4.2Cu3.2Zn0.7/CuAl2. For higher brittleness of CuAl2 layer, the shear strength of the joint was decreased obviously (34.5 MPa). Finally, the interfacial structure of the Cu/Zn-45Al/Al joint was transformed into Cu/CuAl2, the interfacial structure lead to the lower shear strength of the joint, which is only 31.6 MPa.
Key words： Cu/Al joint; brazing; interfacial structure; intermetallic compound; shear strength
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