重庆大学学报2017，Vol.40Issue(4)：18-23,6.DOI:10.11835/j.issn.1000-582X.2017.04.003
脉冲电流烧结Al2O3颗粒的广义热弹性分析
Thermoelastic analysis of Al2O3 powder in pulse electric current sintering
摘要
Abstract
The neck growth mechanism of pulse electric current sintering (PECS),especially for nonconductive powder,is a key problem to study.In this paper,the rapid sintering mechanism and local high temperature of the neck at the initial stage in pulse electric current sintering was investigated for nonconductive Al2 O3 powders based on the L-S (Lord and Shulman) generalized thermoelastic theory.The Comsol Multiphysics was applied to numerically simulate temperature,stress distribution,and the chemical potential and the vacancy concentration of sintering neck.The results show that the heat propagated with a finite velocity,and superposition was produced at sintering neck,so local high temperature generates.The chemical potential on the edge and center of sintering neck shows that surface diffusion is main diffusion mechanism.Local vacancy concentration gradient is present on the sintering neck,promoting the sintering process and reducing the sintering time.关键词
脉冲电流烧结/烧结机理/热弹性分析/化学势/局部高温Key words
pulse electric current sintering/sintering mechanisms/thermoelasticity analysis/chemical potential/local high temperature分类
数理科学引用本文复制引用
张龙,张晓敏,褚钟祥,彭松..脉冲电流烧结Al2O3颗粒的广义热弹性分析[J].重庆大学学报,2017,40(4):18-23,6.基金项目
重庆市自然科学基金资助项目(cstc2012jjA00009) （cstc2012jjA00009）
中央高校基础研究基金项目(CDJZR14335501,CDJZR13240077).Supported by Natural Science Foundation of Chongqing (cstc2012jjA00009) and the Fundamental Research Funds for the Central Universities(CDJZR14335501,CDJZR13240077). （CDJZR14335501,CDJZR13240077）
