掺杂钨丝中钾泡形成的动力学研究

来源期刊：中南大学学报(自然科学版)1992年第3期

论文作者：文先哲

文章页码：303 - 309

关键词：掺杂钨丝; 钾泡; 动力学; 表面扩散; 体扩散; 微扰动

Key words：doped W wire; K bubble; kinetics; surface diffusion; volume diffusion; perturbation

摘    要：本文利用透射和扫描电镜研究了掺杂钨丝退火时钾泡形成的机理和动力学,探讨了用微扰动理论处理钾泡形成过程的可能性。结果表明,冷拨掺杂钨丝中钾管分裂的必要条件是钾管长宽比≥9,在考虑钾泡形成热力学条件后,可导出几个有意义的钾泡分布参数,并发现对于同一丝径的掺杂钨丝,在同一温度退火,形成粗细不同的钾管,比较细的钾管分裂受表面扩散所控制,反之则主要受外部体扩散所控制,与实验结果相符。

Abstract: In this article forming mechanism and kinetics in the annealed doped Wwire is investigated by SEM and TEM. The probability for the forming process of K bubbles to be examined by the perturbing theory was explored. The results show the necessary condition in which K tube disintegrates in the worked doped W wire is that the ratio of length and width should be≥9. After considering thermodynamics condition of the formation for K bubbles, the author deduced some significant distributed parameteres of K bubbles and found K tubes of the different dimensions were formed at the same annealing temperature for doped W wire of the same dimension. The disruption for thinner K tube is primarily dominated by a surface diffusion, inversely by a volume diffusion. It corresponds with experimental results.