将离子渗金属扩散几何视为气-固扩散偶,用多元回归法求得钨在工业纯铁中的渗入曲线的回归方程,作出ln[-y′(x)]对x~2的关系图。图中显示除x=0附近外,全部实验点很好地落在一条直线上,从而表明气-固扩散偶对离子渗金属扩散几何是非常合适的。应用ln[-y′(x)]～x~2关系图求得钨在α-Fe(W)相中的扩散系数。
In this article, the diffusion geometry in double glow plasma surface alloying(DGPSA) was treated as vapor-solid diffusion couple. The concentration distribution of tungsten in the commercially pure iron sample after DGPSA was determined by SEM. The regression equation describing concentration profile for tungsten, y(x) = 2.3698 - 7.8711 ×10-3x + 6.377 × 10-6x2, where y-the concentration of W in α-Fe and x-the distance from sample surface, was established by multi-element regression. The plot of ln[-y'(x)] versus x2 was given, on which all the experimental points fell on a straight line except a few points near x=0. These results illustrated that the vapor-solid diffusion couple was reasonable for diffusion geometry of plasma surface alloying. The diffusivity for tungsten in α-Fe was calculated from the plot of ln[-y'(x)]versus x2.
参考文献
| [1] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%