原位TiB增强ZrB_2-SiC接头的界面组织和力学性能  

Interfacial Microstructure and Properties of In-situ TiB Reinforced ZrB_2-SiC Joints

作　　者：杨卫岐[1] 何鹏[1] 林铁松[1] 贾德昌[2] 

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,黑龙江哈尔滨150001 [2]哈尔滨工业大学特种陶瓷研究所,黑龙江哈尔滨150001

出　　处：《稀有金属材料与工程》2014年第4期901-905,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(50975062;51105107;51275135;51021002);黑龙江省自然科学基金项目(QC2011C044);高等学校博士学科点专项科研基金优先发展领域课题(20112302130005)

摘　　要：以Ag-Cu共晶箔和Ti箔的叠层箔片为中间层,实现了ZrB2-SiC复合陶瓷自身的连接。扫描电镜和能谱分析表明:液态钎料中的Ti能够与ZrB2反应,在陶瓷表面原位生成了具有定向分布的TiB晶须,接头的典型界面结构为ZS/TiB(Ag(s,s))/TiCu(AgCu4Zr)/Ag(s,s)/TiCu(AgCu4Zr)/TiB(Ag(s,s))/ZS。研究了不同温度下接头的组织演化规律,发现ZrB2在液态钎料中的分解温度为860℃,TiB晶须的生成温度为880℃。接头在900℃下保温10 min获得最高抗剪强度134 MPa。较高的强度主要得益于原位TiB晶须阵列对陶瓷表面应力的调节,以及形成陶瓷向焊缝中心的梯度过渡。The ZrB2-SiC ceramics were joined to themselves using Ag-Cu eutectic/Ti lamination as interlayer. The SEM and EDS analyses demonstrate that ZrB2 could react with Ti in brazing alloy to form an in situ TiB whisker array with preferred orientation. The typical microstructure of the joint is ZS/TiB（Ag（s,s））/TiCu（AgCu4Zr）/Ag（s,s）/TiCu（AgCu4Zr）/TiB（Ag（s,s））/ZS. The microstructural evolution at various brazing temperatures was investigated. It is revealed that the ZrB2 decomposing temperature is 860 ℃ and TiB formation temperature is 880 ℃. The maximum shear strength of 134 MPa is obtained when joining at 900 ℃ for 10 min. The high strength mainly benefits from stress accommodation by TiB and gradient transition from the ceramic to the seam center

关 键 词：ZRB2 陶瓷 钎焊 微观结构 力学性能 

分 类 号：TG454[金属学及工艺—焊接]