利用金属间化合物增强陶瓷钎焊接头

Reinforcement of Ceramic Bonded Joints with Intermetallic Compounds

摘要:

采用钎焊的方法连接Si3N4陶瓷，在Ag-Cu-Ti钎料中添加镍，钛元素，在钎焊的同时，使钎缝中进行原位反应，生成金属间化合物增强钎缝，从而达到提高接头强度的目的。对钎缝进行X射线衍射分析结果表明，钎缝中生成了镍钛铜金属间化合物。对钎缝进行显微组织观察表明，生成的金属间化合物呈颗粒状，比较均匀地分布于钎缝中，从而对钎缝强度产生有利的影响，金属间化合物的弥散程度，反应连接层状态等因素对接头强度会产生较大影响，对界面的观察结果表明，界面反应层分为两层结构，形成过程可以分为3个阶段。

Abstract:

Si3N4 Ceramics were bonded by brazing with bonding materials composed of Ag-Cu-Ti foils and Ti/Ni/Ti multi-interlayer,which enhance the joint strength by in situ reaction occurred while brazing.Ni-Ti-Cu intermetallic compounds were observed in the joints by X-ray analysis.The intermetallic particles are homogeneously distributed in the matrix so they contribute to the joint strength.The distribution of intermetallic compounds and the status of interfacial reaction layer have obvious effect on the joint strength.The interfacial reaction layer has a two-layer structure,and the formation of which has three steps.