Fe-Cu粉体烧结过程中的液固界面位移

Sedimentation mechanisms of sintered Fe-Cu alloys

对Fe-Cu粉体的烧结规律进行实验研究。结果表明,烧结过程中固体颗粒的总固相体积分数逐渐减少,并伴随液相区成分梯度的消失,导致界面上升或下降,此位移是由消除成分梯度的沉降机制和固相颗粒重组的沉降机制共同控制。成分梯度消失后,烧结过程进入仅由后一种重组机制控制的慢速界面位移。当初始固相体积分数大于某临界值时,液相区内无成分梯度,所以整个烧结过程由重组机制控制。

Sintering mechanisms of Fe-Cu alloys were investigated. The results show that the overall solid volume fraction decreases in accordance with the disappearance of the composition gradient in the liquid zone of the sample. The solid/liquid interface in the sample goes up during the sintering process. This is controlled by the combination of two mechanisms, concentration gradient eliminating sedimentation and concentration gradient-free sedimentation. When there is no concentration gradient in the liquid zone of the sample, the process is only controlled by the latter mechanism. If an initial solid volume fraction of an alloy is larger than a critical value, the latter mechanism is the only one controlling the interface displacement.