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안효석,장동영,Ahn, Hyo-Sok,Jang, Dong-Young 한국생산제조학회 2009 한국생산제조학회지 Vol.26 No.3
In micro/nano-scale contacts in MEMS and NEMS, capillary and van der Waals forces generated around contacting micro-asperities significantly influence the performance of concerning device as they are closely related to adhesion and stiction of interacting surfaces. In this regard, it is of prime importance to accurately estimate the magnitude of surface forces so that an optimal solution for reducing friction and adhesion of micro/nano-surfaces may be obtained We introduced an effective method to calculate these surface forces based on topography information obtained from an atomic force microscope. This method was used to calculate surface forces generated in the contact interface formed between diamond-like carbon coating and $Si_3N_4$ ball. This method is shown to effectively demonstrate the influence of capillary force in the contact area, especially in humid atmosphere.
원자력현미경의 위상차영상을 이용한 나노표면의 미소기계적 특성 평가
안효석(Hyo-Sok Ahn) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
Phase contrast imaging in atomic force microscopy showed a promise as an effective tool for better understanding of micromechanical properties of surfaces at nano scale. A qualitative estimation model for phase contrast images obtained with a tapping mode AFM was developed. This investigation demonstrated the high efficiency of combined analysis of topography and phase contrast images for characterizing nanosurfaces. Phase contrast images allowed estimation of relative stiffness (elastic modulus) of the sample surface. The phase contrast images revealed a significant inhomogeneity of the nano scale worn surfaces. Phase contrast images are also capable of revealing the formation of tribofilms.
Si 함유량에 따른 Si-DLC/DLC 코팅의 건조마찰 특성
안효석(Hyo-Sok Ahn) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
Although DLC coatings have good tribological properties, these are dependant on the deposition method, property of contact surface, and test condition. Si-DLC/DLC coatings with various Si content were deposited on Si substrates and tested using a reciprocating friction tester against steel balls. The results revealed that the tribological behavior of Si-DLC/DLC coatings was dependant on the Si content. The formation of transfer film and wear particles on the contact surface was greatly influenced by the Si content in DLC coatings. In particular, silicon oxide transfer film formed by tribochemical reaction contributed to reduce wear and friction.
안효석(Hyo-Sok Ahn),김두인(Doo-In Kim) 한국트라이볼로지학회 2008 한국윤활학회지(윤활학회지) Vol.24 No.6
The running-in behaviour of the metal carbon coating (WC/C) was evaluated with regard to its applicability as wear-resistant coating for key components in engines. Reciprocating wear tests under lubricated condition employing an oscillating friction wear tester were performed to investigate the tribological behaviors of the coatings in ambient environment. Confocal microscopy and scanning electron microscopy were used to observe worn surfaces and the wear scars on the steel balls. Elemental composition of the coating and worn surfaces were characterized using Auger electron spectroscopy. The friction behavior of WC/C coating was comparable to common carbon-based coatings. Thin tribofilm was formed on the worn surface of the steel ball due to material transfer and tribochemical reaction whereas there was no evidence of tribofilm generation on the coating surface. indicating the chemical innertness of WC/C coating.
원자력현미경의 위상차영상을 이용한 나노표면의 미소기계적 특성 평가
안효석(Hyo-Sok Ahn) 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.5
Phase contrast imaging in atomic force microscopy showed a promise as an effective tool for better understanding of micromechanical properties of surfaces at nano scale. A qualitative estimation model for phase contrast images obtained with a tapping mode AFM was developed. This investigation demonstrated the high efficiency of combined analysis of topography and phase contrast images for characterizing nanosurfaces. Phase contrast images allowed estimation of relative stiffness(elastic modulus) of the sample surface. The phase contrast images revealed a significant inhomogeneity of the nano scale worn surfaces. Phase contrast images are also capable of revealing the formation of tribofilms.
안효석(Hyo-Sok Ahn),장동영(Dong-Young Jang) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.5
In micro/nano-scale contacts in MEMS and NEMS, capillary and van der Waals forces generated around contacting micro-asperities significantly influence the performance of concerning device as they are related to adhesion and stiction of interacting surfaces. In this regard, it is of prime importance to accurately estimate the magnitude of surface forces so that an optimal solution for reducing friction and adhesion of micro/nano-surfaces may be obtained. We introduce an effective method to calculate these surface forces based on topography information obtained from an atomic force microscope.
안효석(Hyo-Sok Ahn),김두인(Doo-In Kim) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.5
The running-in behaviour of the metal carbon coating (WC/C) has been evaluated with regard to its applicability as wear-resistant coating to key components in engines. Confocal microscopy and scanning electron microscopy were used to observe worn surfaces and the wear scars on the steel balls. Elemental composition of the coating and worn surfaces were characterized using Auger electron spectroscopy. The friction behavior of WC/C coating was comparable to common carbon-based coatings. Thin tribofilm was formed on the worn surface of the steel ball due to material transfer and tribochemical reaction whereas there was no evidence of tribofilm generation on the coating surface. indicating the chemical innertness of WC/C coating.
Si 함유량에 따른 Si-DLC/DLC 코팅의 건조마찰 특성
안효석(Hyo-Sok Ahn) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.5
Although DLC coatings have good tribological properties, these are dependant on the deposition method, property of contact surface, and test condition. Si-DLC/DLC coatings with various Si content were deposited on Si substrates and tested using a reciprocating friction tester against steel balls. The results revealed that the tribological behavior of Si-DLC/DLC coatings was dependant on the Si content. The formation of transfer film and wear particles on the contact surface was greatly influenced by the Si content in DLC coatings. In particular, silicon oxide transfer film formed by tribochemical reaction contributed to reduce wear and friction.
원자력현미경의 위상차영상을 이용한 나노표면의 미소기계적 특성 평가
안효석(Hyo-Sok Ahn) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.5
Phase contrast imaging in atomic force microscopy showed a promise as an effective tool for better understanding of micromechanical properties of surfaces at nano scale. A qualitative estimation model for phase contrast images obtained with a tapping mode AFM was developed. This investigation demonstrated the high efficiency of combined analysis of topography and phase contrast images for characterizing nanosurfaces. Phase contrast images allowed estimation of relative stiffness (elastic modulus) of the sample surface. The phase contrast images revealed a significant inhomogeneity of the nano scale worn surfaces. Phase contrast images are also capable of revealing the formation of tribofilms.
안효석(Hyo-Sok Ahn),장동영(Dong-Young Jang) 한국생산제조학회 2009 한국생산제조학회지 Vol.18 No.4
In micro/nano-scale contacts in MEMS and NEMS, capillary and van der Waals forces generated around contacting micro-asperities significantly influence the performance of concerning device as they are closely related to adhesion and stiction of interacting surfaces. In this regard, it is of prime importance to accurately estimate the magnitude of surface forces so that an optimal solution for reducing friction and adhesion of micro/nano-surfaces may be obtained. We introduced an effective method to calculate these surface forces based on topography information obtained from an atomic force microscope. This method was used to calculate surface forces generated in the contact interface formed between diamond-like carbon coating and Si₃N₄ ball. This method is shown to effectively demonstrate the influence of capillary force in the contact area, especially in humid atmosphere.