陶瓷粒子与金属凝固界面的相互作用

Interaction of Ceramic Particles with Solidifying Metal Front

提出了一种粒子与凝固界面的相互作用模型。当陶瓷粒子与固液界面的接触角小于９０°时，粒子将被生长的固相界面所捕捉。反之，将被排斥。接触角小于９０°的条件是使粒子与固相的界面能小于粒子与液相的界面能。利用区域熔化定向凝固的方法，用Ａｌ－Ｓｉ／Ａｌ２Ｏ３系复合材料进行实验，验证这一模型。

An interaction model is proposed for a particle with a solid/liquid interface. When the contact angle between a ceramic particle and solid/liquid interface is less than 90°, the particle will be entrapped by growing solid interface. Otherwise, it is rejected. The necessary condition for making the contact anlge less than 90° is to make the interfacial energy of a particle with a solid smaller than that of the particle with the liquid. The interaction model has been verified using the zone melting UDS method with the AlSi/Al2O3 composites.