在双层辉光离子渗金属中空位浓度梯度对扩散的影响

应用科学学报 ›› 2000, Vol. 18 ›› Issue (2): 183-185.

在双层辉光离子渗金属中空位浓度梯度对扩散的影响

李忠厚, 刘小平, 徐重

太原理工大学表面工程研究所, 山西太原 030024

收稿日期:1998-12-14 出版日期:2000-06-30 发布日期:2000-06-30
作者简介:李忠厚,(1949-),男,山西盂县人,副教授,硕士.

Effect of Concentration Gradient of Vacancies on Diffusion in Double Glow Plasma Surface Alloying

LI Zhong-hou, LIU Xiao-ping, XU Zhong

Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Received:1998-12-14 Online:2000-06-30 Published:2000-06-30

摘要/Abstract

摘要： 在双层辉光离子渗金属中,由于高能量的离子轰击,在金属表面以下一定深度产生高的空位浓度、位错密度和空位浓度梯度.根据空位机制,从扩散流量导出钼的扩散系数的表达式.同时分析了高空位浓度、高空位浓度梯度对金属原子扩散的影响,指出这些是DGPSA的扩散系数远高于普通渗金属方法的主要原因.

关键词: 空位浓度, 原子浓度梯度, 离子轰击, 空位浓度梯度

Abstract: In double glow plasma surface alloying(DGPSA), high vacancy concentration, high dislocation density and high concentration gradient of vacancies are produced at a definite depth under surface by ion bombardment.
This paper derives the expression of the diffusivity of molybdenum from diffusion flow. Based on vacancy mechanism, it also analyzes the effect of the high vacancy concentration and high concentration gradient of vacancies on diffusion of metal atoms. It points out that these are the main reason why the penetrating velocity of DGPSA is higher than that of conventional diffusion processes.

Key words: ion bombardment, vacancy concentration, concentration gradient of vacancies, concentration gradient of atoms

中图分类号:

TG111.2

李忠厚, 刘小平, 徐重. 在双层辉光离子渗金属中空位浓度梯度对扩散的影响[J]. 应用科学学报, 2000, 18(2): 183-185.

LI Zhong-hou, LIU Xiao-ping, XU Zhong. Effect of Concentration Gradient of Vacancies on Diffusion in Double Glow Plasma Surface Alloying[J]. Journal of Applied Sciences, 2000, 18(2): 183-185.