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Graphene 코팅에 의한 플라스틱 기계부품의 트라이볼로지 특성
문봉호,문성욱,김훈 한국기계기술학회 2023 한국기계기술학회지 Vol.25 No.6
The tribology characteristics of the graphene coated PA6 were evaluated with scratch experiments. As a result, the following conclusions were obtained. The PA6 of the graphene coating shows a 0.1 improvement in friction coefficient and a lower abrasion depth than PA6 in the variable pressure-type scratch experiments. PA6 of the graphene coating showed a lower friction coefficient of 0.2 or more than PA6 in the friction coefficient in the static pressure scratch experiments, indicating that wear resistance was improved. In both the variable and the static pressure type scratch experiments, the tip depth of graphene-coated PA6 shows a thinner wear depth than PA6, showing the effect of graphene. The graphene content showed excellent tribology characteristics at 3%, and there was no difference in tribology characteristics at higher contents.
MEVVA를 이용한 Ti이온 주입시 발생하는 용융금속이 마모에 미치는 영향
문봉호,양경욱 여수대학교 1998 論文集 Vol.13 No.2
The surface treatment technology such as CVD. PVD. Ion implantation has been developed to improve wear resistances of materials. Ion implanted surface treatment changes only surface characteristics of materials without any dimensional change. Hard coating by CVD, PVD makes region a material, since ion implantations do not have a boundary region, the spalling at the boundary is not occurred. This methods also has some advantages of the stable of size due to non-heating treatment. MEVVA which is a ion beam apparatus has merits of low cost and is usable to various metals, but occurs a droplet ranging from micron to tens of micron at ion implantations. This study clarifies the droplet influences on wear at Ti ion implantation into 1C-3Cr steel using SEM Tribosystem. Results show that the droplet occurred at ion implantation makes the severe wear. Therefore, the ion-implanted surface should be removed the droplet. 1C-3Cr steel implanted Ti ion by MEVVA is most effective for wear resistance under contact pressure 5.5GPa.
SEM Tribosystem에 의한 CVD TiN막의 미시적 마모 특성 평가
문봉호(Bongho Moon) 한국표면공학회 2004 한국표면공학회지 Vol.37 No.3
This study surveys the microscopic wear of CYO TiN coatings in repeated sliding, using the SEM Tribosystem as in-situ system. According to the research, the depth of wear groove and the specific wear amount are changed by the transition of the microscopic wear mode. This investigation leads to the fact that the change of wear characteristics produces the transition of the wear mode. In this survey, four modes are observed for CYO TiN coatings with the thickness of 1.6 ㎛: ploughing, powder formation, flake formation and coating delimitation. The microscopic wear properties is quantitatively evaluated in terms with the microscopic wear mode and the specific wear amount. These relationships prove that the observation of wear modes with a SEM Tribosystem is useful to evaluate wear properties.
SEM Tribosystem에 의한 TiN피막의 미시적 마모형태의 천이 조건
문봉호(Bong-Ho Moon) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.3
To evaluate the wear characteristics of very thin ceramic coated layer, it is very important to investigate its wear process in great detail. An effective method for investigating the wear of a thin layer is the observation of wear process in microscopic detail, using in-situ system. In this study, based on the SEM Tribosystem as in-situ system, the microscopic wear mode of TiN coatings was investigated in repeated sliding. Consequently, four modes were revealed for TiN coatings: Ploughing, powder formation, flake formation and coating delimitation. Sc(Severity of contact) can clarify transition condition of those microscopic wear modes.
미끄럼반복마찰의 직접관찰에 의한 TiN피막의 허용응력에 관한 연구
문봉호(Moon Bongho) 한국트라이볼로지학회 2011 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.27 No.3
The ceramic coatings are excellent materials of cutting tools and sliding parts. To evaluate the wear characteristics of very thin ceramic coated layer, it is very important to investigate its wear process micro-scopically. An effective method for investigating the wear of a thin layer is the observation of wear process in microscopic detail using in-situ system. In this study, using the SEM Tribosystem as in-situ system, the micro-scopic wear mode of TiN coatings was investigated in repeated sliding. As results, four modes were observed for TiN coatings: Ploughing, powder formation, flake formation and coating delimitation. The observation of the microscopic wear by in-situ system can clarify the allowable stress of TiN coating.
문봉호(Moon Bongho) 한국트라이볼로지학회 2011 한국윤활학회지(윤활학회지) Vol.27 No.5
Recently the demand for a fast and precise actuator in semiconductor industries is growing larger. A SAW motor is now expected as a new friction-drive actuator to meet such demand. However, its friction and wear properties are almost unknown and its low stability and reliability still remain to be solved. In this research the tests or SAW motor were carried out and its durability was discussed. The effect of wear caused by friction on the driving force and driving speed were clarified.