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MoO<sub>3</sub>가 첨가된 Cr<sub>2</sub>O<sub>3</sub> 플라즈마 용사코팅의 고온 마찰 마멸 특성
여인웅,안효석,임대순,Lyo, In-Woong,Ahn, Hyo-Sok,Lim, Dae-Soon 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.9
산화몰리브덴($MoO_3$)이 첨가된 산화크롬 용사코팅층을 제조하여 산화몰리브덴의 첨가에 따른 고온(450$^{\circ}C$)에서의 플라즈마 용사코팅층에 마찰, 마멸특성을 조사하였다. 마찰, 마멸 특성에 대한 실험을 위하여 왕복동 마멸시험장치를 사용하였다. TEM을 이용하여 코팅층의 미세 구조와 각 상들의 조성을 살펴보았다. 분석 결과에 의하면 산화몰리브덴이 입계로 분산되어 있어 코팅층의 경도와 밀도의 증가가 발생하였다. 마멸시험후 마멸면의 물리적 변화와 화학적 조성의 변화를 SEM와 XPS를 통하여 살펴보았다. 산화몰리브덴이 첨가된 코팅층에서 마찰계수의 감소를 관찰할 수 있었다. 산화몰리브덴이 첨가된 코팅의 마멸된 표면에 마찰, 마멸에 유리한 보호막의 형성이 광범위하게 일어남을 알 수 있었다. 이러한 보호막에 몰리브덴이 산화몰리브덴의 형태로 존재하는 것을 XPS 분석을 통하여 알 수 있었다. 보호막에 산화몰리브덴의 존재가 마찰계수를 감소시키는 것으로 생각된다. Tribological behavior of plasma-sprayed $Cr_2O_3$-based coatings containing $MoO_3$ at 450$^{\circ}C$ was investigated to understand the influence of $MoO_3$. A reciprocal disc-on-plate type tribo-tester was employed to examine fricition and wear behavior of the specimens. The microstructure and phase composition of the coating was characterized with Transmission Electron Microscopy(TEM). The TEM analysis indicated that $MoO_3$ was dispersed into the grain boundary, resulting in the increase of the hardness and density of the coating. Worn surfaces were investigated by scanning electron microscopy and chemistry of the worn surfaces was analyzed using a X-ray Photoelectron Spectrometer(XPS). The results showed that the friction coefficient of the $MoO_3$-added coatings was lower than that without $MoO_3$ addition. The larger protecting layers were observed at the worn surface of plasma spray coated specimens with $MoO_3$ composition in the protecting layer appears to be more favorable in reducing the friction.
자동차용 강판의 표면 텍스처링 효과에 따른 고성형성 연구
윤승채 ( Seung Chae Yoon ),여인웅 ( In Woong Lyo ),조민행 ( Min Haeng Cho ) 대한금속재료학회 ( 구 대한금속학회 ) 2012 대한금속·재료학회지 Vol.50 No.1
This study aims to analyze the formability property of surface texturing processed automotive steel sheet for improving the sheet forming property. In the paper, the effect of cavities fabricated using the laser surface texturing technique on automotive high strength steel sheets was studied. The frictional behavior of the sheet drawing is a function of interface parameters such as sheet surface roughness, holding force, contact pressure, etc. For these reasons, automotive steel researchers want to optimize the surface topography of automotive steel sheets in order to enhance the formability. Therefore, this study presents the behavior of deformation of a laser surface texturing steel sheet by considering the frictional operation during the deep drawing process.
XPS 분석을 통한 CrMoN 코팅의 마찰마모 거동 연구
양영환 ( Young Hwan Yang ),여인웅 ( In Woong Lyo ),박상진 ( Sang Jin Park ),임대순 ( Dea Soon Lim ),오윤석 ( Yoon Suk Oh ) 대한금속재료학회 ( 구 대한금속학회 ) 2012 대한금속·재료학회지 Vol.50 No.8
The tribological behavior of CrMoN films with respect to surface chemistry was investigated by using X-ray photoelectron spectroscopy (XPS). All of the films were prepared from a hybrid PVD system consisting of DC unbalanced magnetron (UBM) sputtering and arc ion plating (AIP) sources. The tribological property of the films was evaluated by a friction coefficient using a Ball-on-disk type tribometer. The chemistry of wear track was analyzed by energy dispersive spectroscopy (EDS) and XPS. The friction coefficient was measured to be 0.4 for the CrMoN film, which is lower than that of a monolithic CrN film. EDS and XPS results imply the formation of an oxide layer on the coating surface, which was identified as molybdenum oxide phases, known to be a solid lubricant during the wear test.
중간층 조건에 따른 Cr-Mo-N 막의 상형성 및 마찰마모 거동 연구
양영환(Young-Hwan Yang),여인웅(In-Woong Lyo),박상진(Sang-Jin Park),임대순,오윤석(Yoon-Suk Oh) 한국표면공학회 2011 한국표면공학회지 Vol.44 No.6
Phase evolution and tribological behavior of Cr-Mo-N multi compositional films with different interlayer were investigated. The films were deposited by hybrid PVD (Physical Vapor Deposition) system consisted of dc unbalanced magnetron (UBM) sputtering and arc ion plating (AIP) sources. A pure molybdenum (Mo) was used as sputtering target and also a pure Cr was used as AIP target to form the Cr-Mo-N films. Various growth planes were found, no textured surface, in all of the multi composition films. Maximum value of microhardness was measured in Cr-Mo-N film with Mo interlayer as 29 GPa. Composition film was mainly showed the aspect of the adhesive wear than CrN film. The friction coefficient was decreased from 0.6 for pure CrN coating to 0.35 for Cr-Mo-N film with Mo interlayer. This result may come from the formation of metal oxide tribo-layer which is known as solid lubricant during the wear test.
안정욱(JeongUk Ahn),안승균(SeongGyun Ahn),여인웅(InWoong Lyo),김형익(HyeongIk Kim),김웅(Woong Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
We have developed a well designed sputter DLC coating on valve lifter, which has reduced the mechanical friction by 40% and improved the fuel efficiency by 0.8%. This paper is focusing on mutual correlation between friction characteristic and the microstructure of DLC such as hydrogen concentration, sp3/sp2 ratio and I(D)/I(G).
금속-유기 프리커서를 통한 연료전지 분리판 성능/내구 향상 소재 연구
최광훈(Choi Kwang Hoon),김보경(Kim Bo Kyung),여인웅(Lyo In Woong),홍웅표(Hong Woong Pyo),서지연(Seo Ji Youn) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Diamond-like nanocomposite coatings comprising metal-organic precursor and carbon material were explored by plasma enhanced chemical vapor deposition with various CF4 flow rates. As the flow rate of CF4 increase, surface energies and corrosion properties of the resulting coating were enhanced, indicating CF bonding between carbon and fluorine were generated during PECVD reactions. High conductivity of the resulting coating is a reasonably possible candidate for separator plates