Al共晶接触反应钎焊热力学分析

Thermodynamical analysis on Al eutectic reaction brazing

用扫描电镜和电子探针研究了Al共晶接触反应钎焊液相的润湿行为 ,以分步法观察Cu在Al表面的润湿铺展过程 ,并运用热力学参数分析Al共晶接触反应钎焊机理。结果表明 ,Cu原子可以沿Al的晶界优先扩散 ,达到共晶成分后形成液相 ,实现Al的共晶接触反应钎焊。

The wetting behavior of liquid phase for Al eutectic reaction brazing was studied using SEM and EDX.A step by step approach was used to observe the spreading of Cu on Al on eutectic condition.The mechanism of Al eutectic reaction brazing was analyzed using thermodynamical parameters. The results show that the Cu on the grain boundary of base metal Al must come from the the solid atoms through diffusion of Cu. After the eutectic ingredients are accumulated, a binary low melting point eutectic substance is formed at the grain boundary, and the eutectic reaction brazing of Al is formed.