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| DEPLETION OF ALLOYING ELEMENTS IN THE SURFACE LAYER PRODUCED BY DOUBLE GLOW PLASMA ALLOYING AND ITS MITIGATION |
| LI Zhonghou LIU Xiaoping SU Yongan (Taiyuan University of Technology; Taiyuan 030024) |
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Abstract In double glow plasma surface alloys, the depletion of some alloying elements in the surface layer was observed. Ion bombardment produced a seriously distorted layer beneath the sueface. The atom diffusivity in the distorted layer was higher than that in the undistorted layer. During diffusion process, the atoms gathered at interface of the distorted and undistorted layers. At the same time, the distortion gradient in the distortion zone supported this gathering. The sputtering and sputtering attenuation also promoted the generation of this inner peak of concentration. Mitigation or elimination of the depletion could be achieved by raising voltage and current of source plate, increasing metal atoms deposited on workpiece in unit time and carrying out high temperature diffusion after the plasma alloying.
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Received: 25 August 1997
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Cite this article:
LI Zhonghou LIU Xiaoping SU Yongan (Taiyuan University of Technology; Taiyuan 030024). DEPLETION OF ALLOYING ELEMENTS IN THE SURFACE LAYER PRODUCED BY DOUBLE GLOW PLASMA ALLOYING AND ITS MITIGATION. J Chin Soc Corr Pro, 1997, 17(4): 295-298.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1997/V17/I4/295
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1 Murch G E, Nowick A S. Diffusion in crystalline solids, Orlande: Academic Press, Inc., 1984
2 肖纪美.合金相与相变,北京:冶金工业出版社,1987, p.183 |
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