Ag-CuO-NiO-LiAlSiO4复合钎料空气反应钎焊GH3128/Al2O3接头组织及性能

doi:10.11896/cldb.22090003

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Abstract Reactive air brazing(RAB) of Al₂O₃ ceramic and GH3128 alloy was successfully achieved by using Ag-CuO-NiO-LiAlSiO₄ composite filler reinforced by NiO and LiAlSiO₄ particles. The effects of NiO and LiAlSiO₄ content on the microstructure and the mechanical properties of GH3128/Al₂O₃ joint were investigated. The interface microstructure and the formation mechanism of the brazed joint were analyzed and discussed either. The results show that a composite oxidation reaction layer including CuCrO₄ inner oxide layer and NiO outer oxide layer is formed on the surface of GH3128 alloy, and the interfacial layer with CuAl₂O₄ as the main component is formed on the surface of Al₂O₃ ceramic in the brazing process. The addition of NiO improves the wettability of the composite solder. Meanwhile, the addition of LiAlSiO₄ reduces the coefficient of thermal expansion of the composite filler metal, the filler metal with low coefficient of thermal expansion can reduce the residual stress of the brazed joint, which greatly improve the performance of the joints. The shear strength of the joint reaches the maximum (61.8 MPa) when Ag-10%CuO composite filler metal containing 0.3%NiO(mass fraction) and 4%LiAlSiO₄(mass fraction) is used. The typical interfacial microstructure of the joint is GH3128/CuCrO₄+CrNi₃+NiO+CuO/Ag+CuO+LiAlSiO₄/CuAl₂O₄/Al₂O₃.

Key words： reactive air brazing aluminium oxide ceramic GH3128 alloy composite filler interfacial microstructure mechanical property

Published: 25 January 2024 Online: 2024-01-26

CLC number:

TG454

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	Articles by authors
	CHEN Enguang
	SU Xinqing
	XUE Songbai
	CHEN Xudong
	FU Renli
	ZHANG Xiaotian
	CHENG Bo
	WANG Changhong
	WANG Mingwei

Cite this article:

CHEN Enguang,SU Xinqing,XUE Songbai, et al. Microstructure and Properties of GH3128/Al₂O₃ Joint Brazed via Reactive Air Brazing with Ag-CuO-NiO-LiAlSiO₄ Composite Filler[J]. Materials Reports, 2024, 38(2): 22090003-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22090003 OR http://www.mater-rep.com/EN/Y2024/V38/I2/22090003

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