Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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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

SM45C 탄소강의 플라즈마 침류질화 처리 시 $H_2S$, $C_3H_8$ 가스 첨가에 따른 미세조직 및 마찰계수의 변화

  • 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)
  • 고영기 (울산대학교 첨단소재공학부) ;
  • 문경일 (한국생산기술연구원 플라즈마응용팀) ;
  • 이원범 (한국생산기술연구원 플라즈마응용팀) ;
  • 김성완 (한국생산기술연구원 플라즈마응용팀) ;
  • 유용주 (울산대학교 첨단소재공학부)
  • Received : 2007.08.14
  • Accepted : 2007.09.05
  • Published : 2007.09.30
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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

References

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