活性钎料真空钎焊Si3N4/钢接头性能的研究
PROPERTIES OF VACUUM BRAZED Si3N4/STEEL JOINT USING ACTIVE BRAZING FILLER METAL
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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Si3N4/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Si3N4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Si3N4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。Abstract: The influence of active element Ti in Ag-Cu-Ti filler metal on wettability and joint strength has been studied. Filler metal with 3%Ti achieved good results in direct brazing of silicon nitride to steel. For the sake of improving joint strength, different interlayers have been synthetically investigated. Experiments showed that interlayer of low yield strength material may reduce the residual stress in the joint and increase Joint strength more effectively than that of interlayer of low coefficient of expansion material. Stress magnitude and distribution was calculated and analysed by thermal elastoplastic FEM and compared with experiment results. By means of SEM, EDX, and EPMA analyses the joining mechanism was investigated. Active element Ti in the brazing alloy diffused into Si3N4 and chemical reactions occured in ceramic-metal interface, certain chemical compounds consist of N and Ti produced.
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Keywords:
- Brazing /
- Welded joint /
- Function
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期刊类型引用(4)
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