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Micro Structure and the Coefficient of Friction with $H_2S$ and $C_3H_8$ Gas Addition During Plasma Sulf-nitriding of SM45C Carbon Steel  

Ko, Y.K. (Department of Material science and Engineering, Ulsan University)
Moon, K.I. (Plasma enhanced technology Development Team, KITECH)
Lee, W.B. (Plasma enhanced technology Development Team, KITECH)
Kim, S.W. (Plasma enhanced technology Development Team, KITECH)
You, Y.Z. (Department of Material science and Engineering, Ulsan University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.20, no.5, 2007 , pp. 237-242 More about this Journal
Abstract
Friction coefficient of SM45C steel was surprisingly reduced with $H_2S$ and $C_3H_8$ gas during plasma sulf-nitriding. During the plasma sulf-nitriding, 100-700 sccm of $H_2S$ gas and 100 sccm of $C_3H_8$ gas were added and working pressure and temperature were 2 torr, $500-550^{\circ}C$, respectively. As $H_2S$ gas amount increased over 500 sccm, flake-like structures were developed on top of the nitriding layer and grain size of the nitriding layer were about 100 nm. The friction coefficient for the sample treated plasma sulf-nitriding under $N_2-H_2S$ gas was 0.4 - 0.5. The structure became more finer and amorphous-like along with $N_2-H_2S-C_3H_8$ gas and the nano-sized surface microstructures resulted in high hardness and significantly low friction coefficient of 0.2.
Keywords
Plasma sulf-nitriding; SM45C; $H_2S$ & $C_3H_8$ Gas; Friction coefficient;
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