基于Ti中间层的B_(4)C复合陶瓷扩散连接接头界面微观组织与力学性能  

Interfacial microstructure and mechanical properties of B_(4)C matrix composite joints diffusion bonded with Ti interlayer

作　　者：陶拥 王睿[1] 宋奎晶 刘大双 钟志宏[1] 吴玉程[1] TAO Yong;WANG Rui;SONG Kuijing;LIU Dashuang;ZHONG Zhihong;WU Yucheng(Hefei University of Technology,Hefei,230009,China)

机构地区：[1]合肥工业大学,合肥230009

出　　处：《焊接学报》2022年第1期29-35,I0004,I0005,共9页Transactions of The China Welding Institution

基　　金：国家重点研究开发计划项目(2019YFE03100400);科技部磁约束核聚变能发展研究专项(2015GB121003)。

摘　　要：碳化硼(B_(4)C)复合陶瓷以其高硬度、高熔点、良好的耐磨性以及吸收中子能力的特性,广泛应用于制造防弹装甲材料,原子反应堆控制以及耐磨耐高温结构材料等领域.文中采用中间层Ti箔对碳化硼复合陶瓷(B_(4)C-SiC-TiB_(2))进行扩散连接,研究了连接温度对连接界面组织及接头力学性能的影响.结果表明,在连接温度1300~1450℃下成功扩散连接了B_(4)C-SiC-TiB_(2)复合陶瓷,Ti与B_(4)C反应生成TiB_(2)和TiC.随着连接温度的升高,反应层变厚,而过厚的反应层会对接头的性能造成不利影响.在连接温度1300℃时,反应层的平均厚度约为5μm,此时获得较高的接头抗剪强度100 MPa;在连接温度1450℃时连接层基本为TiB_(2)和TiC陶瓷相,此时扩散连接接头可以获得较高硬度(25.4 GPa).Boron carbide(B_(4)C) matrix composites are widely used in the manufacture of bulletproof armor,atomic reactor,wear and high temperature resistant structural materials due to their high hardness,high melting point,good wear resistance and neutron absorption ability.In this paper,B_(4)C matrix composites(B_(4)C-SiC-TiB_(2)) were diffusion bonded with intermediate layer Ti foil.The effects of bonding temperature on the microstructure of bonding interface and mechanical properties of joint were studied.The results show that B_(4)C-SiC-TiB_(2) composites are successfully diffusion bonded at bonding temperature 1300-1450℃,and Ti reacts with B_(4)C to form TiB_(2) and Ti C.With the increasing of bonding temperature,the reaction layer becomes thicker,but too thick reaction layer will adversely affect the shear strength of the joint.The average thickness of the reaction layer is about 5μm when the bonding temperature is 1300℃with the maximum of shear strength up to100 MPa.The reaction layer is composed of TiB_(2) and TiC with high hardness(25.4 GPa)at bonding temperature1450℃.

关 键 词：碳化硼 复合陶瓷 扩散连接 接头组织 力学性能 

分 类 号：TG439.6[金属学及工艺—焊接]