Ag-CuO钎料空气反应钎焊AlN陶瓷接头组织及性能  

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

作　　者：罗云 胡胜鹏[1,2] 李子寒 许志泉 张雷 宋晓国 张丽霞[1] LUO Yun;HU Shengpeng;LI Zihan;XU Zhiquan;ZHANG Lei;SONG Xiaoguo;ZHANG Lixia(State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001;Shandong Provincial Key Laboratory of Special Welding Technology,Harbin Institute of Technology(Weihai),Weihai 264209;State Key Laboratory of Advanced Brazing Filler Metals and Technology,Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd.,Zhengzhou 450001)

机构地区：[1]哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨150001 [2]哈尔滨工业大学(威海)山东省特种焊接技术重点实验室,威海264209 [3]郑州机械研究所有限公司新型钎焊材料与技术国家重点实验室,郑州450001

出　　处：《机械工程学报》2020年第6期95-101,共7页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(51905125,51775138,U1737205)。

摘　　要：采用Ag-Cu O钎料实现了Al N陶瓷与自身的空气反应钎焊。研究了Cu O含量、钎焊温度和预氧化温度对界面组织及力学性能的影响规律,分析了连接机理。当钎料成分为Ag-6 mol%Cu O,在1000℃/5 min的钎焊参数下,Al N/Ag-Cu O/Al N接头可获得最高的抗剪切强度为13.9 MPa。采用SEM、EDS及XRD对其接头界面显微组织、断口形貌及成分进行了分析。典型接头界面组织结构为Al N/Cu Al2O4/Cu O/Al N+Ag+Cu O/Cu O/Cu Al2O4/Al N。然而,在该条件下无法获得无缺陷的接头。为了降低残余热应力获得无缺陷的接头,对Al N陶瓷采用预氧化处理,在Al N陶瓷表面形成一层Al2O3层。当预氧化参数为1 000℃/5 h时,Al N陶瓷表面的Al2O3层厚度约为10μm。采用成分为Ag-6 mol%Cu O的钎料,在1 000℃/5min的钎焊参数下,对预氧化后的Al N陶瓷进行连接,获得了无缺陷的接头,接头典型界面显微组织为Al N/Al2O3/Cu Al2O4/Cu O/Ag+Al2O3/Cu O/Cu Al2O4/Al2O3/Al N。接头的抗剪切强度最高为22.6 MPa,与未氧化的Al N陶瓷接头相比提升了62.6%。接头进行抗剪切测试时,断面主要出现在Al N陶瓷母材。Reactive air brazing of Al N ceramics is achieved using Ag-Cu O brazes. The effects of Cu O 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% Cu O, the highest shear strength about 13.9 MPa of the Al N/Ag-Cu O/Al N 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 Al N/Cu Al2 O4/Cu O/Al N+Ag+Cu O/Cu O/Cu Al2 O4/Al N. 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 Al N ceramic to form an Al2 O3 layer on the surface of the Al N ceramic. When the pre-oxidation parameter is 1 000 ℃/5 h, the thickness of the Al2 O3 layer on the surface of the Al N ceramic is about 10 μm. The pre-oxidized Al N ceramics are joined at a brazing temperature of 1 000 ℃/5 min using a brazing filler metal of Ag-6 mol%Cu O to obtain a defect-free joint. The typical interfacial microstructure of the joint is Al N/Al2 O3/Cu Al2 O4/Cu O/Ag+Al2 O3/Cu O/Cu Al2 O4/Al2 O3/Al N. The joint has a shear strength of up to 22.6 MPa and an increase of 62.5% compared to the unoxidized Al N ceramic joint. When the joints are subjected to shear resistance test, the fracture sections mainly are observed in the Al N ceramic.

关 键 词：ALN陶瓷 空气反应钎焊 预氧化 界面显微组织 抗剪切强度 Ag-CuO钎料 

分 类 号：TG156[金属学及工艺—热处理]