Research on the Process and Mechanism of Reactive Air Brazing of Al2O3Ceramics with AgCu28-B2O3 Filler

doi:10.3901/JME.2023.10.048

Abstract

Abstract: In order to obtain Al₂O₃ ceramic joint with good performance at low cost, AgCu28-20B₂O₃ fillerr is developed and applied to air reaction brazing Al₂O₃ ceramics. B₂O₃ can improve the wettability of AgCu28 filler on Al₂O₃ ceramic surface effectively. In the brazing process, Cu powder is oxidized to CuO and further reacted with Al₂O₃ and B₂O₃ to form Cu₂Al₆B₄O₁₇ whiskers. Thus, the reliable joint with excellent performance is obtained. When the holding time is 60 min and the brazing temperature is higher than 950℃, an effective Al₂O₃ ceramic joint can be realized. The center area of the brazing joint is mainly Ag, while the interface is composed of CuO and Cu₃B₂O₆ mixed phases and the rod-like Cu₂Al₆B₄O₁₇ whiskers. The shear strength of the joint increases with the increase of the brazing temperature. When the brazing temperature is higher than 1 100℃, the whiskers decompose into amorphous granular products at high temperature and then the joint shear strength decreases. Holding at 1 050℃ for 60 min is the optimum process parameter. The joint shear strength can reach 70.9 MPa and the fracture occurred in the weld near the Al₂O₃ ceramic base material. A composite filler for Al₂O₃ connection is developed, and a new type of whiskers is synthesized in the joint to improve the joint performance.

Key words: Al₂O₃ ceramics, AgCu28-B₂O₃ filler, reactive air brazing, Cu₂Al₆B₄O₁₇ whiskers, process parameters, reaction mechanism

CLC Number:

TG425

LI Xinyue, LI Jian, ZHANG Jiankang, LIN Panpan, LIN Tiesong, HE Peng. Research on the Process and Mechanism of Reactive Air Brazing of Al₂O₃Ceramics with AgCu28-B₂O₃ Filler[J]. Journal of Mechanical Engineering, 2023, 59(10): 48-55.

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Research on the Process and Mechanism of Reactive Air Brazing of Al₂O₃Ceramics with AgCu28-B₂O₃ Filler

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