Micromechanics of formation and shrinkage of a closed pore in sintering by coupled grain boundary/surface diffusion
Micromechanics of formation and shrinkage of a closed pore in sintering by coupled grain boundary/surface diffusion
复制标题
晶界/表面耦合耦合烧结过程中闭孔形成和收缩的微观力学
DOI：
10.1016/j.jeurceramsoc.2019.03.022
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发表时间：
2019
影响因子：
5.7
通讯作者：
Guillon Olivier
中科院分区：
文献类型：
--
作者：
Wakai Fumihiro;Okuma Gaku;Nishiyama Norimasa;Guillon Olivier
应力辅助烧结的微观原理是两个相邻颗粒之间的相对速度与烧结力和接触传递的机械力的总和成正比。本文采用晶界扩散和表面扩散耦合的方法模拟了四种颗粒的烧结过程，分析了烧结力随颗粒形状的演变，即孔道的挤压、封闭孔道的形成和收缩的变化规律。孔隙体积的收缩率与颗粒的相对速度成正比，其次与烧结力成正比。讨论了机械应力对烧结的影响。
The microscopic principle of the stress-assisted sintering is that the relative velocity between two adjoining particles is proportional to the sum of the sintering force and the mechanical force transmitted by the contact. Here, we simulated sintering of four particles by coupled grain boundary diffusion and surface diffusion, in order to analyze how the sintering force varies with the evolution of particle shape, i.e., pinch-off of pore channel, formation and shrinkage of a closed pore. The shrinkage rate of the pore volume was proportional to the relative velocity of particles, then, to the sintering force. We discussed the effect of mechanical stress on sintering also.