Ag-CuO-B_(2)O_(3)钎料空气反应钎焊连接Al_(2)O_(3)陶瓷机理  

Mechanism of Alumina Ceramics with Ag–CuO–B_(2)O_(3) Filler via Reactiver Air Brazing

作　　者：李昕悦 李健[1,2] 张健康 林盼盼 林铁松[1] 何鹏[1] LI Xinyue;LI Jian;ZHANG Jiankang;LIN Panpan;LIN Tiesong;HE Peng(Harbin Institute of Technology State Key Laboratory of Advanced Welding and Joining,Harbin 150001,China;Naughty Officer School of Army Armored Force Academy,Changchun 130117,China;Sino-Platinum Metals CO.,LTD.Kunming 650000,China)

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]陆军装甲兵学院士官学校,长春130117 [3]贵研铂业股份有限公司,昆明650000

出　　处：《硅酸盐学报》2022年第3期704-712,共9页Journal of The Chinese Ceramic Society

基　　金：国家磁约束核聚变能发展研究专项资助(2019YFE03100100);国家自然科学基金项目(51974101,51975150和51805112);云南省重大科技专项云南省稀贵金属材料基因工程(一期2020)-贵金属材料专业数据库建设及应用示范(一期)(202002AB080001-1);山东省重大科技创新工程项目(2019JZZY010366)。

摘　　要：以Ag-CuO-B_(2)O_(3)为钎料,采用空气反应钎焊法连接了Al_(2)O_(3)陶瓷,在接头中合成了新型Cu_(2)Al_(6)B_(4)O_(17)晶须。研究了连接温度与保温时间对接头显微结构、性能以及生成的晶须结构的影响。结果表明:钎焊过程中,Al_(2)O_(3)与钎料中的CuO、B_(2)O_(3)发生反应生成Cu_(2)Al_(6)B_(4)O_(17)晶须,获得性能优异的可靠接头。保温时间为60 min、连接温度高于950℃时,可以实现Al_(2)O_(3)陶瓷接头的有效连接,钎缝中心区主要为Ag,靠近连接界面处为CuO、Cu_(3)B_(2)O_(6)相及Cu_(2)Al_(6)B_(4)O_(17)晶须。随着连接温度的升高,接头的抗剪强度升高。连接温度高于1 050℃后,晶须变得粗大,出现黏接,对接头的强化效果减弱,接头的抗剪强度降低。连接温度高于1 100℃后,晶须分解为片层状产物,接头的抗剪强度大幅降低。最佳工艺参数为在1 000℃条件下保温60 min,接头的抗剪强度可达86.7 MPa,断裂发生在焊缝中靠近母材处。Alumina ceramics were joined with Ag–10CuO–10B_(2)O_(3)filler via reactiver air brazing for the formation of whiskers(Cu_(2)Al_(6)B_(4)O_(17)) in the joints.The effects of brazing temperature and holding time on the microstructure,properties of the joints and the whisker structure were investigated.The results show that Al_(2)O_(3)reacts with CuO and B_(2)O_(3)to form Cu_(2)Al_(6)B_(4)O_(17)whiskers in the brazing process,thus obtaining a reliable joint with the superior performance.At the holding time of 60 min and the brazing temperature of>950℃,an effective connection of Al_(2)O_(3)ceramic joint can be realized.The center area of the brazing joint is mainly Ag,while the interface at the both sides of the joint is composed of CuO、Cu_(3)B_(2)O_(6)phase and Cu_(2)Al_(6)B_(4)O_(17)whiskers.The shear strength of the joint increases with the increase of the brazing temperature.The whiskers become thick and the adhesion occurs when the brazing temperature is>1 050℃,thus reducing the strengthening effect on the joint and the shear strength of the joint.The whiskers decompose into some lamellar products,and the shear strength of the joint decreases when the brazing temperature is>1 100℃.The shear strength of the joint prepared under optimum process parameters (i.e.,at 1 000℃for 60 min) can reach 86.7MPa,and the fracture occurs in the weld nearby alumina ceramic base material.

关 键 词：氧化铝陶瓷 银基复合钎料 空气反应钎焊 硼酸铜铝晶须 反应机理 

分 类 号：TG425.2[金属学及工艺—焊接]