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通过钎料中常用活性材料与被钎陶瓷Ｓｉ＿３Ｎ＿４之间的物理现象和化学反应，讨论了活性材料所起的作用，即通过活性金属与Ｓｉ＿３Ｎ＿４陶瓷的化学反应形成反应过渡层而结合，同时活性材料改善了钎料在Ｓｉ＿３Ｎ＿４陶瓷表面的漫流性能．但因为反应产物与Ｓｉ＿３Ｎ＿４陶瓷热物理性能相差较大，故活性材料的加入量应限制在一定范围以内。用Ａｇ－Ｃｕ－Ｔｉ钎料钎接Ｓｉ＿３Ｎ＿４／钢时，在Ｓｉ＿３Ｎ＿４／钎料过渡区生成了富ＴｉＮ层和富Ｔｉ＿３Ｓｉ＿５层，控制这两个反应结合层的成分和厚度可能是提高钎接接头强度的关键之一。此外在一定范围内增加钎料层厚度时，钎接接头强度有明显提高。
Through the physical phenomenon and chemical reaction between the common active material in brazing filler metal and brazed ceramic Si_3N_4, the effect of the active material is discussed, that is, the reaction layer is formed through the chemical reaction between the active metal and Si_3N_4 ceramic and the active material Improve the solder in the Si_3N_4 ceramic surface of the flow performance. However, because the reaction products and thermal properties of Si_3N_4 ceramic differ greatly, so the amount of active material should be limited to within a certain range. The brazing of Si_3N_4 / steel with Ag-Cu-Ti brazing filler metal resulted in the formation of TiN-rich and Ti_3Si_5-rich layers in the Si_3N_4 / brazing alloy transition zone. The composition and thickness of these two reaction bonding layers may be enhanced by the brazed joint strength One of the keys. In addition, when the thickness of brazing material is increased within a certain range, the strength of the brazed joint is obviously improved.