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A Study on the Effect of Pre-treatment on the Formation of Nitriding Layer by Post Plasma  

Moon, Kyoung Il (Plasma Enhanced Technology Development Team, Production Technology Center, KITECH)
Byun, Sang Mo (Plasma Enhanced Technology Development Team, Production Technology Center, KITECH)
Cho, Yong Ki (Plasma Enhanced Technology Development Team, Production Technology Center, KITECH)
Kim, Sang Gweon (Plasma Enhanced Technology Development Team, Production Technology Center, KITECH)
Kim, Sung Wan (Plasma Enhanced Technology Development Team, Production Technology Center, KITECH)
Publication Information
Journal of the Korean Society for Heat Treatment / v.18, no.1, 2005 , pp. 24-28 More about this Journal
Abstract
New post plasma nitriding can achieve a high uniformity that have been difficult in DC nitriding and have a high productivity comparable to gas nitriding. However, it has not a enough high nitriding potential for a rapid nitriding, because surface activation or ion etching in the general plasma nitriding cannot be expected. Thus, in this study, the effects of pre-treatments with oxidation and reduction gas have been investigated to improve the nitriding kinetics of post plasma nitriding. An effective pre-treatment consisting of oxidation and reduction resulted in the increase of surface energy of STD 11. This induced the surface hardness and the effective nitriding depth of STD 11. It is thought that the increase of the surface energy and the surface area with pre-treatment promote the nucleation of nitriding layer.
Keywords
Post plasma; Nitriding; Pre-treatment; Surface activation;
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  • Reference
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