表面扩散机制下非等径金属粉末烧结过程的数值模拟研究（英文）  

Numerical Simulation of Sintering of Non-equal Metal Powders by Surface Diffusion

作　　者：宋敏[1] 郑洲顺[1] 谌东东 汤慧萍[2] 王建忠[2] 

机构地区：[1]中南大学,湖南长沙410083 [2]西北有色金属研究院金属多孔材料国家重点实验室,陕西西安710016

出　　处：《稀有金属材料与工程》2017年第10期2842-2846,共5页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51174236,51134003);The National Basic Research Development Program of China(2011CB606306);The Opening Project of State Key Laboratory of Porous Metal Materials(PMM-SKL-4-2012);Innovation Project of Central South University(2016zzts220))

摘　　要：主要进行了表面扩散机制下非等径金属粉末烧结过程的数值模拟研究。为了准确地描述非等径金属粉末的烧结过程,对表面扩散模型建立了更加合适的初始边值条件,并用有限差分法对该模型进行数值求解,实现了半径比为1:1、1:1.5、1:2的非等径金属粉末烧结过程的二维及三维数值模拟。非等径金属粉末烧结过程的数值模拟结果与实验结果吻合较好。最后,分析了非等径金属粉末的半径比对烧结颈半径生长速度的影响。数值模拟结果表明:随着金属粉末半径比的减小,烧结颈半径生长速度逐渐变快。This paper focuses on the numerical simulation of sintering of non-equal metal powders by surface diffusion. In order to simulate the sintering process of non-equal metal powders clearly, the surface diffusion model was modified by establishing more suitable initial boundary conditions. And this model was numerically solved by the finite difference method. The 2D and 3D numerical simulations of two metal powders with radii ratios of 1：1, 1：1.5, 1：2 were implemented by this model. Through comparison, the simulation results are consistent with the experimental ones. Finally, the effect of metal powders＇ radii ratios on the growth rate of sintering neck was investigated. The results show that the sintering neck radius increases with the decreasing of radii ratios of metal powders.

关 键 词：烧结 金属粉末 表面扩散 有限差分 半径比 

分 类 号：TF124.5[冶金工程—粉末冶金]