http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
졸겔법과 자가조립법을 통해 제조된 메조포러스 $SiO_2$ 박막의 트라이볼로지 특성
이영제,신윤하,김지훈,김지만,김태성,Lee, Young-Ze,Shin, Yun-Ha,Kim, Ji-Hoon,Kim, Ji-Man,Kim, Tae-Sung 한국트라이볼로지학회 2007 한국윤활학회지(윤활학회지) Vol.23 No.6
Frictional characteristics of mesoporous $SiO_2$ thin films were evaluated with different pore sizes. The films were manufactured by sol-gel and self-assembly methods to have a porous structure. The pores on the surface may play as the outlet of wear particle and the storage of lubricant so that the surface interactions could be improved. The pores were exposed on the surface by chemical mechanical polishing (CMP) or plasma-etching after forming the porous films. The ball-on-disk tests with mesoporous $SiO_2$ thin films on glass specimen were conducted at sliding speed of 15 rpm and a load of 0.26 N. The results show considerable dependency of friction on pore size of mesoporous $SiO_2$ thin films. The friction coefficient decreased as increasing the pore size. CMP process was very useful to expose the pores on the surface.
여러 미끄럼 조건에 따른 로터리 압축기 베인 / 롤러 표면의 마찰 마멸 특성
이영제(Young-Ze Lee),오세두(Se-Doo Oh),김종우(Jong-Woo Kim),김철우(Cheol-Woo Kim),최진규(Jin-Kyu Choi),조성욱(Sung-Ook Cho) 한국유체기계학회 2002 유체기계 연구개발 발표회 논문집 Vol.- No.-
One of the serious challenges in developing rotary compressor with HFC refrigerant is the prediction of scuffing times and wear amounts between vane and roller surfaces. In this study, the tribological characteristics of sliding surfaces using vane-roller geometry of rotary compressor were investigated. The sliding tests were carried out under various sliding speeds, normal loads and surface roughness. During the test, friction force, wear depth, time to failure and surface temperature were monitored. Because severe wear was occurred on vane surface, TiN coating was applied on sliding surfaces to prolong the wear-life of vane-roller interfaces. From the sliding test it was found that there was the optimum initial surface roughness to break in and to prolong the wear life of sliding surfaces. Depending on the load and speed, the protective layers, which were composed of metallic oxide and organic compound, were formed on sliding surfaces. Those would play an important role in the amounts of friction and wear between roller and vane surfaces.
BSR 감소를 위한 재료 쌍 간의 마찰 특성 비교 연구
이영제(Young-Ze Lee),박주호(Joo-Ho Park),이재혁(Jae-Hyuk Lee),김은석(Eun-Seok Kim) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
Though there is much improvement of reduction of BSR (Buzz, Squeak, and Rattle) noise inside of vehicle, still there are a lot of shortcomings not considering the friction characteristics of material pair used in vehicle. In this paper, we proceeded fretting test using material pair used in a vehicle or excavators to find relationship between noise and estimated values such as surface roughness, wear area, hardness of each material. First, we find relationship between roughness and wear area by comparing measured surface roughness and calculated wear area. Then, we also find tendency between hardness and noise by comparing measured surface hardness of each material and recorded noise.
박용창(Young-Chang Park),이중희(Jung-Hee Lee),이규선(Gyu-Sun Lee),김용환(Yong-Hwan Kim),이성재(Seung-Jae Lee),이영제(Young-Ze Lee) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.6
Fretting can be defined as the oscillatory motion with very small amplitudes, which usually occur between two contacting surfaces. Fretting wear is the removal of material from contacting surfaces through fretting action. This fretting wear, which occurs between cladding tubes of nuclear fuel rod and grids, causes in damages the cladding tubes by flow induced vibration in a nuclear reactor. In this paper the fretting wear tests were performed with two types of cladding tubes and three types of supporting grids in water. Fretting wear tests were done using various applied loads. From the results of fretting tests, the wear amounts of tube materials can be predictable by obtaining the wear coefficient using the work rate model. Depending on various normal load, tube materials, and supporting grid shapes, distinctively different wear scar of fretting and stick-slip mechanism can occur.
알루미늄ㆍ탄소나노튜브 복합재의 분산 조건에 따른 마찰 마멸 특성
이중희(Jung-Hee Lee),김일영(Il-Young Kim),이규선(Gyu-Sun Lee),윤정일(Jeong-Il Youn),김영직(Young-Jig Kim),백승현(Seung-Hyun Baik),이영제(Young-Ze Lee) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.6
To improve a lightweight property and mechanical properties, carbon nanotube-aluminum composites were fabricated using HP(Hot Pressing) method. These composites are fabricated under three different conditions. To know the friction and wear characteristics according to dispersion conditions, the coefficient of friction and the wear rate were evaluated using pin-on-disk tester. And conglomerated CNT particles are observed using SEM(Scanning Electron Microscope). As a result, it was proven that irregular dispersion of CNT leads an increase in friction coefficient and wear rate.
나노다이아몬드를 첨가한 오일의 트라이볼로지 특성 및 이에 미치는 표면 경도의 영향
이규선(Gyu-Sun Lee),김현수(HyunSoo Kim),이정훈(Jeonghoon Lee),박태희(Tae Hee Park),이정석(Jung Suk Lee),이영제(Young-Ze Lee) 한국트라이볼로지학회 2011 한국윤활학회지(윤활학회지) Vol.27 No.6
Nanodiamond was dispersed in paraffin liquid oil to investigate the effects of nanodiamond at the marginally lubricated condition. Scuffing test and immediate loading sliding wear test were conducted using the fabricated nanodiamond oil. As a result, dispersion of nanodiamond in oil leads to increase in scuffing life, and nanodiamond contents affects the scuffing life. In case of immediate loading sliding wear test, the result was different according to hardness of specimen. If hardness of specimen was low, abrasion of nanodiamond occurred actively. If hardness of specimen was increased, however, nanodiamond can act as a spacer or rolling between contacting surfaces.
알루미늄탄소나노튜브 복합재의 가공 방법과 탄소나노튜브 함량에 따른 트라이볼로지 특성
이중희(Jung-Hee Lee),김일영(Il-Young Kim),이규선(Gyu-Sun Lee),백승현(Seung-Hyun Baik),윤정일(Jeong-Il Youn),김영직(Young-Jig Kim),이영제(Young-Ze Lee) 한국트라이볼로지학회 2008 한국윤활학회지(윤활학회지) Vol.24 No.5
Carbon nanotube composite is considered to be a good candidate material for composite material because of its excellent mechanical property and low density under high temperature as well as good wear and frictional properties. In this study, tribological characteristics of carbon nanotube aluminum composite were evaluated using pin-on-disk wear tester. Spark Plasma Sintering method is more effective than Hot Pressing method in terms of wear and friction. The composite with 1% CNT has the lowest friction and wear characteristic.
로터리 압축기 구동부 재료인 GCD-550 과 GC-250 의 마찰 마멸 특성에 미치는 냉매의 영향
이규선(Gyu-Sun Lee),전홍규(Hong-Gyu Jeon),조성욱(Sung-Oug Cho),이영제(Young-Ze Lee) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.11
In order to adapt the environment-friendly refrigerants to compressors, it is necessary to know the tribological characteristics in case of using those refrigerants. This paper is a study on evaluating the tribological characteristics of compressor with an alternative carbon dioxide refrigerant. To know the effects of carbon dioxide, sliding wear tests were carried out with non-refrigerant, carbon dioxide refrigerant and R410a refrigerant that is being used now. The specimens are GCD-550 and GC-250 those are made of the real material as used a shaft and flange of rotary compressor. Consequently, wear scar width of carbon dioxide is the largest among three conditions. The surface roughness was measured after tests. In case of carbon dioxide, cracks propagated more deeply in the depth direction in comparison with other cases.
Hertz 압력에 따른 TiAlCrN 코팅의 마찰ㆍ마멸특성 및 수명 평가
우상규(Sang-Kyu Woo),이영제(Young-Ze Lee) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.37 No.-
In this paper, we investigated the wear life, wear rate, and its transition on the Hertz pressure. In the experiment, we used TiAlCrN coating deposited by the sputtering technique and ball diameter of 10㎜, 7.94㎜ and 4.76㎜ for the various Hertz pressure. Ball-on-disk sliding tests were performed under the unlubricated condition. As the diameter of a ball decreased, the failure load of TiAlCrN coating decreased. However, a good correlation was observed between the wear life and Hertz pressure, and all ball specimens showed the infinite wear life at about 450㎫. In measurement of wear rate, as the diameter of the ball incresed, the wear transition appeared in bigger load. However, a good correlation was observed between the wear rate and Hertz pressure. The transition appeared in the range from 550㎫ to 600㎫ at all ball speimens.
아노다이징된 알루미늄 합금에 대한 TiAlN 코팅, 무전해 Ni-P 도금의 트라이볼로지 특성 비교
이규선(Gyu-Sun Lee),배성훈(Sung-Hoon Bae),이영제(Young-Ze Lee) 한국트라이볼로지학회 2010 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.26 No.1
A ceramic coating is a surface treatment method that is being used widely in the industrial field, recently. Ni-P plating is also being used widely because of its corrosion resistance and low cost. An anodizing method is applicable to aluminum alloy. An anodizing method generates a thick oxide layer on the surface and then, that heightens hardness and protects the surface. These surface treatments are applied to various mechanical components and treated surfaces relatively move one another. In this study, tribological characteristics of Ni-P plating and TiAlN coating on anodized Al alloy are compared. The counterpart, anodized Al alloy, is worn out abrasively by Ni-P plating and TiAlN coating that have higher hardness. Abrasively worn debris accumulated on the surfaces of Ni-P plating and TiAlN coating, and then transferred layer is formed. This transferred layer affects the amplitude of variation of friction coefficient, which is related to noise and vibration. The amplitude of variation of friction coefficient of Ni-P plating is lower than those of TiAlN coating during the tests.