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- 저자 : 박율민(Y. M. Park) (검색결과 2 건)
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플라즈마 침질탄화처리시 처리시간이 화합물층의 특성에 미치는 영향
박율민(Y. M. Park),신평우(P. W. Shin),조효석(H. S. Cho),남기석(K. S Nam),이구현(K. H. Lee) 한국진공학회(ASCT) 2000 Applied Science and Convergence Technology Vol.9 No.4
플라즈마 침질탄화처리는 보통탄소강, 저합금강 등에 내마모성, 내식성 및 내피로성 향상에 사용되어 있으며 자동차 부품, 기계류 부품, 공업용 공구 등에 적용할 수 있는 표면경화열처리이지만 내마모성 및 내식성을 향상시키는 단상의 ε 화합물층을 생성시키기는 어려운 문제점으로 남아 있다. 따라서 본 연구에서는 탄소강과 저합금강에 대해 질소와 CH₄ 가스농도를 변화시켜 플라즈마 침질탄화처리를 실시하여 단상의 ε 화합물층 생성가능성과 시간을 변화시켜 화합물층의 생성과정을 고찰하였다. ε 화합물층은 질소농도가 증가할수록 형성이 용이하였고 CH₄ 가스농도가 증가할수록 ε 화합물층의 형성이 용이하였지만 시멘타이트상이 생성되었다. 화합물층은 10분이 경과한 후 생성되었고 γ’상으로부터 시작되었으며 처리시간이 10시간 이상이 되면 화합물층내에 시멘타이트상이 생성되어 화합물층의 두께가 감소하였다. Plasma nitrocarburising is a thermochemical heat treatment, and can be used for plain carbon steels and low alloy steels to improve wear, corrosion and fatigue resistance. The process is performed on automotive parts, machinery parts and engineering tools. However, it is still facing problems in obtaining a mono ε phased compound layer. Therefore, the aim of this research is to investigate the possibility of forming a mono ε phased compound layer using a gas mixture of nitrogen and methane. ε was found that high nitrogen contents were essential for the production of ε phase compound layer and with increasing methane content in the gas mixture, ε phase compound layer was favoured. In addition, when the methane content was further increased, cementite was observed in the compound layer. γ' phase was produced after 10 minutes treatment time and cementite was formed in the compound layer resulting in decreasing the thickness of the compound layer.
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이구현(K . H . Lee),남기석(K . S . Nam),이상로(S . R . Lee),조효석(H . S . Cho),신평우(P . W . Shin),박율민(Y . M . Park) 한국열처리공학회 2001 熱處理工學會誌 Vol.14 No.2
N/A Plasma nitrocarburising and post oxidation were performed on SM45C steel using a plasma nitriding unit. Nitrocarburising was carried out with various methane gas compositions with 4 torr gas pressure at 570℃ for 3hours and post oxidation was carried out with 100% oxygen gas atmosphere with 4 torr at different temperatures for various times. It was found that the compound layer produced by plasma nitrocarburising consisted of predominantly ε-Fe_(2-3)(N,C) and a small proportion of γ-Fe₄(N,C). With increasing methane content in the gas mixture, a phase compound layer was favoured. In addition, when the methane content was further increased, cementite was observed in the compound layer. The very thin oxide layer on top of the compound layer was obtained by post oxidation. The formation of oxide phase was initially started from the magnetite(Fe₃O₄) and with increasing oxidation time, the oxide phase was increased. With increasing oxidation temperature, oxide phase was increased. However the oxide layer was split from the compound layer at high temperature. Corrosion resistance was slightly influenced by oxidation times and temperatures.
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