活性钎料真空钎焊Si_3N_4/钢接头性能的研究  

PROPERTIES OF VACUUM BRAZED Si_3N_4/STEEL JOINT USING ACTIVE BRAZING FILLER METAL

作　　者：包芳涵[1] 任家烈[1] 周运鸿[1] 

机构地区：[1]北京清华大学

出　　处：《焊接学报》1990年第4期200-204,共5页Transactions of The China Welding Institution

摘　　要：本文研究了Ag-Cu-Ti 钎料中活性金属Ti 的含量对润湿性及接头性能的影响,确定含Ti3%时直接钎焊Si_3N_/钢时效果最好。为改善接头强度而进行了加入中间层的研究,结果证明,软金属中间层有明显的降低接头热应力,提高接头强度的作用.而以线膨胀系数与Si_3N_4相近的金属作审间层时效果较差。采用热弹塑性有限元方法计算和分析了带有各种中间层的接头应力状况,与试验结果进行了对照。经SEM,EDX 及EPMA 分析研究可知,钎料中活性元素Ti 向Si_3N_4中扩散并在界面发生化学反应而生成几种N 与Ti 的化合物,从而形成结合。The influence of active element Ti in Ag-Cu-Ti filler metal on wettabilityand joint strength has been studied.Filler metal with 3%Ti achieved goodresults in direct brazing of silicon nitride to steel.For the sake of improvingjoint strength,different interlayers have been synthetically investigated.Expe-riments showed that interlayer of low yield strength material may reduce theresidual stress in the joint and increase joint strength more effectively thanthat of interlayer of low coefficient of expansion material.Stress magnitudeand distribution was calculated and analysed by thermal elastoplastic FEM andcompared with experiment results.By means of SEM,EDX,and EPMA analy-ses the joining mechanism was investigated.Active element Ti in the brazingalloy diffused into Si_3N_4 and chemical reactions occured in ceramic-metal in-terface,certain chemical compounds consist of N and Ti produced.

关 键 词：钎焊 焊接接头 性能 

分 类 号：TG454[金属学及工艺—焊接]