接触反应钎焊技术研究进展

Research developments of contact reaction brazing

综述了国内外关于接触反应钎焊工艺试验和连接机理的研究进展,介绍了钎焊温度、保温时间、中间层厚度和连接压力对同种和异种材料接触反应钎焊接头性能的影响,认为中间层材料的选择对于保证异种材料接触反应偶中共晶液相的产生及控制其方向性非常重要。基于接触反应钎焊连接机理动力学模型,将钎焊界面形成过程分为固相点接触扩散阶段、液相产生阶段、液相扩散阶段、等温凝固阶段和残余液相析出阶段,总结了各个阶段的特点。对接触反应钎焊技术的研究趋势进行了预测,认为一些新型中间层材料及中间层制备技术的研发有助于拓展接触反应钎焊技术的应用。该方法的连接机理的数学模型和数值模拟技术还需要进一步研究和探讨。

The research developments of process test and connection mechanism of contact reaction brazing(CRB) were reviewed.The influences of the brazing temperature,holding time,the thickness of intermediate layer and the pressure on properties of brazed joints of same materials and dissimilar materials were introduced,and the slection of interlayer material was very important to form and control the direction of eutectic liquid phase in CRB process.The formation of brazed interface was divided into five stages of solid phase point contact diffusion,liquid formation phase,liquid phase diffusion,isothermal solidification phase and residual liquid precipitation,and the characteristics of various stages were summed in detail.The advanced interlayer material and the preparation techniques of the intermediate layer can help to expand the application of contact reaction brazing technology,and the mathematical models and numerical simulation techniques of CRB need to be further studied.