Microstructure and Property of Cu/Al Joint Brazed with Al-Si-Ge Filler Metal

doi:10.11900/0412.1961.2016.00342

Acta Metall Sin

2017, Vol. 53

Issue (6): 719-725 DOI: 10.11900/0412.1961.2016.00342

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Microstructure and Property of Cu/Al Joint Brazed with Al-Si-Ge Filler Metal

Zhiwei NIU,Zheng YE,Kaikai LIU,Jihua HUANG(

),Shuhai CHEN,Xingke ZHAO

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

Cite this article:

Zhiwei NIU,Zheng YE,Kaikai LIU,Jihua HUANG,Shuhai CHEN,Xingke ZHAO. Microstructure and Property of Cu/Al Joint Brazed with Al-Si-Ge Filler Metal. Acta Metall Sin, 2017, 53(6): 719-725.

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Abstract

Cu/Al brazing has good prospect for applications in the air conditioning and refrigeration industry. A suitable filler metal is the key of Cu/Al brazing. The chemical and physical properties of the filler metal have great influence on the brazing process and parameters. And the strength of the brazing joint is closely related to the properties of the filler metal and the brazing process. While the previous studies have not developed a kind of Cu/Al brazing filler metal which can achieve a tough joint at a low brazing temperature. In this work, the Al-5.6Si-25.2Ge filler metal was first used to braze Cu/Al dissimilar metals, and the melting characteristics of the filler metal, spreading wettability, Cu interfacial structure and strength of brazed joint were investigated systematically. Additionally, the common Zn-22Al filler metal was also used for comparison. The results show that the Al-5.6Si-25.2Ge filler metal possesses low melting temperature (about 541 ℃) and excellent spreading wettability on Cu and Al base metals. The interfacial structure of Al-5.6Si-25.2Ge/Cu was CuAl₂/CuAl/Cu₃Al₂. The thickness of planar CuAl and Cu₃Al₂phases was only 1~2 μm, and the thickness of cellular CuAl₂ phase was about 3 μm. The interfacial structure of Zn-22Al/Cu was CuAl₂/CuAl/Cu₉Al₄, but the average thickness of the CuAl₂ layer was up to 15 μm. The test results of the shearing strength show that the shearing strength of the Cu/Al joint brazed with Zn-22Al filler metal was only 42.7 MPa, but the shearing strength brazed with Al-5.6Si-25.2Ge filler metal was higher (53.4 MPa).

Key words: Al-Si-Ge filler metal Cu/Al joint interfacial structure shearing strength

Received: 01 August 2016

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	Zhiwei NIU
	Zheng YE
	Kaikai LIU
	Jihua HUANG
	Shuhai CHEN
	Xingke ZHAO

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https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00342 OR https://www.ams.org.cn/EN/Y2017/V53/I6/719

Fig.1 Schematic of the brazed specimen (unit: mm)

Fig.2 SEM images (a, c) and XRD spectra (b, d) of Al-5.6Si-25.2Ge (a, b) and Zn-22Al (c, d) filler metals

Fig.3 DTA curves of filler metals

Fig.4 SEM images (a, c) and EDS element line scanning along the lines in Figs.4a and c (b, d) of Cu/Al joints brazed with Al-5.6Si-25.2Ge (a, b) and Zn-22Al (c, d) filler metals

Table 1 EDS results of phases in the interfacial zones of the Cu/Al joints in Fig.4

Fig.5 SEM images of the fracture surface of the Cu/Al joints brazed with Al-5.6Si-25.2Ge (a) and Zn-22Al (b) filler metals

Fig.6 Typical SEM image of the fracture position of the Cu/Al joint

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