Microstructure and Properties of AlN Ceramic Reactive Air Brazing Joints Using Ag-CuO Brazes

被引：0
|
作者：
Luo Y. [1 ]
Hu S. [1 ,2 ]
Li Z. [2 ]
Xu Z. [2 ]
Zhang L. [3 ]
Song X. [1 ,2 ]
Zhang L. [3 ]
机构：
[1] State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin
[2] Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology(Weihai), Weihai
[3] State Key Laboratory of Advanced Brazing Filler Metals and Technology, Zhengzhou Research Institute of Mechanical Engineering Co., Ltd., Zhengzhou
来源：
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2020年 / 56卷 / 06期
关键词：
Ag-CuO brazes; Aluminum nitride ceramic; Interfacial microstructure; Pre-oxidation; Reactive air brazing; Shear strength;
D O I：
10.3901/JME.2020.06.095
中图分类号：
学科分类号：
摘要：
Reactive air brazing of AlN ceramics is achieved using Ag-CuO brazes. The effects of CuO content, brazing temperature and pre-oxidation temperature on interface microstructure and mechanical properties are studied. The joining mechanism is analyzed. When the composition of brazes is Ag-6 mol% CuO, the highest shear strength about 13.9 MPa of the AlN/Ag-CuO/AlN joints is obtained under the brazing parameters of 1 000 ℃/5 min. The interface microstructure, fracture morphology and composition of the joints are analyzed by SEM, EDS and XRD. The typical joint interface microstructure is AlN/CuAl2O4/CuO/AlN+Ag+CuO/CuO/CuAl2O4/ AlN. However, a defect-free joint can not be obtained under this condition. In order to reduce the residual thermal stress and obtain a defect-free joint, a pre-oxidation treatment is applied to the AlN ceramic to form an Al2O3 layer on the surface of the AlN ceramic. When the pre-oxidation parameter is 1 000℃/5 h, the thickness of the Al2O3 layer on the surface of the AlN ceramic is about 10 μm. The pre-oxidized AlN ceramics are joined at a brazing temperature of 1 000 ℃/5 min using a brazing filler metal of Ag-6 mol%CuO to obtain a defect-free joint. The typical interfacial microstructure of the joint is AlN/Al2O3/CuAl2O4/CuO/Ag+Al2O3/CuO/CuAl2O4/ Al2O3/AlN. The joint has a shear strength of up to 22.6 MPa and an increase of 62.5% compared to the unoxidized AlN ceramic joint. When the joints are subjected to shear resistance test, the fracture sections mainly are observed in the AlN ceramic. © 2020 Journal of Mechanical Engineering.
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页码：95 / 101
页数：6
相关论文
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