Ag-Cu+WC复合钎料钎焊ZrO_2陶瓷和TC4合金
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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 ZrO_2 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 ZrO_2 ceramic/TiO+Cu_3Ti_3 O/TiCu+TiC+W+Ag(s,s)+Cu(s,s)/TiCu_2/TiCu/Ti_2Cu/TC_4 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 TC_4 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 °C for 10 min,which increased by about 57.3% than that of the joints without WC addition.
Novel Ag-Cu+WC composite filler was developed to braze ZrO_2 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 ZrO_2 ceramic/TiO+Cu_3Ti_3 O/TiCu+TiC+W+Ag(s,s)+Cu(s,s)/TiCu_2/TiCu/Ti_2Cu/TC_4 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 TC_4 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 °C for 10 min,which increased by about 57.3% than that of the joints without WC addition.
引文
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[2]Feng J,Dai X,Wang D,et al.Microstructure evolution and mechanical properties of ZrO2/TiAl joints vacuum brazed by Ag-Cu filler metal[J].Materials Science&Engineering A,2015,639:739-746.
[3]Chuang T H,Yeh M S,Chai Y H.Brazing of zirconia with AgCuTi and SnAgTi active filler metals[J].Metallurgical&Materials Transactions A,2000,31(6):1591-1597.
[4]Tekeli S.The solid solubility limit of Al2O3 and its effect on densification and microstructural evolution in cubic-zirconia used as an electrolyte for solid oxide fuel cell[J].Materials&Design,2007,28(2):713-716.
[5]王红英,汤伟杰,李志军,等.激光重熔纳米氧化锆热障涂层的抗热冲击性能[J].焊接学报,2014,35(5):91-94.Wang H,Tang W,Li Z,et al.Investigation of thermal shock resistance of the nanostructured zirconia thermal barrier coatings treated by laser glazing[J].Transactions of the China Welding Institution,2014,35(5):91-94.
[6]刘会杰,冯吉才.陶瓷与金属的连接方法及应用[J].焊接,1999(6):5-9.Liu Huijie,Feng Jicai.Bonding processes of ceramics to metals and their application[J].Welding&Joining,1999(6):5-9.
[7]王大勇,冯吉才,刘会杰,等.Al2O3/Cu/Al扩散连接工艺参数的优化[J].材料科学与工艺,2003,11(1):73-76.Wang Dayong,Feng Jicai,Liu Huijie,et al.Optimization of technological parameters for diffusion bonding Al2O3 ceramics to aluminum alloy[J].Materials Science&Technology,2003,11(1):73-76.
[8]梁凯,熊腊森.先进的结构陶瓷材料及其钎焊连接技术的研究进展[J].现代焊接,2006(9):11-14.Liang Kai,Xiong Lasen.The research development of advanced structural ceramics material and soldering joining technology[J].Modern Welding Technology,2006(9):11-14.
[9]Aravindan S,Krishnamurthy R.Joining of ceramic composites by microwave heating[J].Materials Letters,1999,38(4):245-249.
[10]任家烈,吴爱萍.先进材料的连接[M].北京:机械工业出版社,2000.
[11]Dai X,Cao J,Liu J,et al.Interfacial reaction behavior and mechanical characterization of ZrO2/TC4 joint brazed by AgCu filler metal[J].Materials Science&Engineering A,2015,646:182-189.