粉末固相烧结的动力学蒙特卡洛模拟  

Kinetic Monte Carlo simulation of solid-state sintering of powder

作　　者：王晓勉[1] 黄龙霄 秦湘阁[1] 

机构地区：[1]佳木斯大学材料科学与工程学院,佳木斯154007

出　　处：《中国体视学与图像分析》2017年第2期151-157,共7页Chinese Journal of Stereology and Image Analysis

基　　金：国家自然科学基金(51271089);佳木斯大学研究生科技创新项目(LM2015_002)

摘　　要：本文用动力学蒙特卡罗方法模拟了粉末固相烧结过程,研究了模型参数以及固相扩散、孔隙迁移及空位湮灭速率对烧结致密化动力学的影响。结果表明,在烧结中期,晶粒之间的烧结颈增大,烧结体的致密度迅速提高,固固界面的迁移对烧结体的致密化起主要作用,固固界面的迁移事件发生的概率越大,致密化速率越高,烧结体致密度越大;而在烧结后期,仅有少量孔隙存在于晶界处,晶界空位的湮灭对烧结体致密化起主要作用,空位湮灭事件发生的概率越大,单位时间内空位湮灭的越快,最终烧结体致密度越高。In this paper, the kinetic Monte Carlo method is used to simulate powder solid -phase sintering process. The effects of model parameters such as rates of solid diffusion, pore migration and vacancy annihilation on densification kinetics are investigated. Results show that in the middle phase of sintering, the sintering neck gradually grows, and the densification of the sintered body increases rapidly. As the migration of solid interface plays a major role in densification of the sintered body during this period, the higher of the probability of the migration of solid interface, the greater the densification rate, the greater the density of the structure. In the final phase of sintering, only a small amount of pores exist in the grain boundary. The vacancy annihilation in the grain boundaries plays a major role in the densification of the sintered body so that the greater the probability of the vacancy annihilation event, the faster the vacancy annihilation in the unit time, the higher the final sintered density.

关 键 词：烧结动力学 扩散 致密度 POTTS模型 

分 类 号：TF124.5[冶金工程—粉末冶金]