Ag-Cu+WC复合钎料钎焊ZrO_2陶瓷和TC4合金  

Brazing ZrO_2 ceramic and TC4 alloy using Ag-Cu+WC composite filler

作　　者：王子晨 曹健[1] 代翔宇[1] 冯吉才[1] WANG Zichen;CAO Jian;DAI Xiangyu;FENG Jicai(State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,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

出　　处：《焊接学报》2019年第1期5-9,161,共6页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51622503;U1537206)

摘　　要：采用新型Ag-Cu+WC复合钎料进行ZrO_2陶瓷和TC4合金钎焊连接,探究了接头界面组织及形成机制,分析了钎焊温度对接头界面结构和力学性能的影响.结果表明,接头界面典型结构为ZrO_2/TiO+Cu_3Ti_3O/TiCu+TiC+W+Ag(s,s)+Cu(s,s)/TiCu_2/TiCu/Ti_2Cu/TC_4.钎焊过程中,WC颗粒与Ti发生反应,原位生成TiC和W增强相,为TiCu金属间化合物、Ag基和Cu基固溶体提供了形核质点,同时抑制了脆性Ti-Cu金属间化合物的生长,优化了接头的微观组织和力学性能.随钎焊温度的升高,接头反应层的厚度逐渐增加,WC颗粒与Ti的反应程度增强.当钎焊温度890℃、保温10 min时,复合钎料所得接头抗剪强度达到最高值82.1 MPa,对比Ag-Cu钎料所得接头抗剪强度提高了57.3%.Novel Ag-Cu+WC composite filler was developed to braze ZrO2 ceramic and TC4 alloy.The interfacial microstructure and formation mechanism of the joints were investigated.The effect of brazing temperature on the microstructure and mechanical properties of the joints was analyzed.It is found that the typical microstructure of the joints was ZrO2 ceramic/TiO+Cu3Ti3O/TiCu+TiC+W+Ag(s,s)+Cu(s,s)/TiCu2/TiCu/Ti2Cu/TC4 alloy.During brazing,the insitu formed TiC and W reinforced phases through reacting between WC particles and active Ti served as nucleation site for Ti-Cu intermetallic compounds,Ag-based solid solution and Cu-based solid solution and suppressed the growth of brittle Ti-Cu intermetallic compounds adjacent to TC4 alloys.Hence,the microstructure of the joints was optimized and the mechanical properties were improved.As the brazing temperature increased,the thickness of reaction layers in the joints gradually increased,and the reaction between WC particles and active Ti enhanced.The maximum shear strength of joints achieved 82.1 MPa when brazing at 890℃ for 10 min,which increased by about 57.3%than that of the joints without WC addition.

关 键 词：ZRO2陶瓷 WC颗粒 复合钎料 界面组织 

分 类 号：TG454[金属学及工艺—焊接]