CeO<sub>2</sub>对Ag30CuZnSn药芯银钎料润湿性能及钎焊接头组织与性能的影响

doi:10.11896/cldb.20030054

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Abstract CeO₂ powders were added into Ag30CuZnSn flux cored brazing filler metal. Effect of CeO₂ on wettability, microstructure and properties of brazed joint were studied. The roles of CeO₂ on the wettability, the microstructure of brazed joints were explored. The results showed that CeO₂ addition can improve the wettability. When the content of CeO₂ was 0.3wt%, the improvement effect reached the optimum. Theoretical analysis showed that CeO₂ can react with Cu₂O on the surface of T2 copper to form CuO and Ce₂O₃. Then CuO, Cu₂O and CeO₂, Ce₂O₃ reacted with B₂O₃ in flux to form CuO·Ce₂O₃·B₂O₃ and so on. These promoted the wettability by oxide film removal. When the amount of CeO₂ was excessive, the viscosity of the liquid flux was increased due to its high melting point. CeO₂ which was not involved in the reaction, will hinder the fluidity of molten flux and then hinder the spreading of molten metals on the surface of T2 copper. CeO₂ as an oxide with high melting point, not only played the role of nucleating particle, but also acted as the interfacial activity agent. Therefore, during flame brazing, CeO₂ can refine the microstructure of brazed joints. When the addition of CeO₂ was 0.3wt%, the refining effect reached the best. The shear strength of brazed joint was increased by more than 10% due to the refinement of brazed joint microstructures. These results were confirmed by the fracture morphologies of brazed joints and the transformation law.

Key words： CeO₂ powders Ag30CuZnSn flux cored brazing filler metal wettability

Published: 10 May 2021

CLC number:

TG425

Fund:State Key Laboratory of Advanced Welding and Joining (AWJ-21M15), the Technology and Innovation Program for Undergraduates of Jiangsu University of Science and Technology, the Provincial Key Laboratory of Advanced Welding Technology.

About author:: Juan Pu received her Ph.D. degree in Material Proces-sing Engineering from Huazhong University of Science and Technology in 2016.She is currently an associate professor in Jiangsu University of Science and Technology. Her research interests are welding metallurgy. More than 10 articles have been published in important journals at home and abroad, and 5 invention patents have been declared. She is given the title of “vice president of science and technology” of Jiangsu high level innovation and entrepreneurship talent introduction plan. She wins the second prize of provincial science and technology progress reward.

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	PU Juan
	XUE Songbai
	ZHANG Lei
	WU Mingfang
	LONG Weimin
	WANG Shuiqing
	QIAN Sijian
	LIN Tiesong

Cite this article:

PU Juan,XUE Songbai,ZHANG Lei, et al. Effect of CeO₂ on Wettability of Ag30CuZnSn Flux Cored Brazing Filler Metal and Microstructure and Properties of Brazed Joint[J]. Materials Reports, 2021, 35(8): 8134-8139.

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http://www.mater-rep.com/EN/10.11896/cldb.20030054 OR http://www.mater-rep.com/EN/Y2021/V35/I8/8134

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