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아노다이징 알루미늄 합금에 대한 다양한 코팅의 마찰 및 마멸 메커니즘
이규선(GyuSun Lee),배성훈(SungHoon Bae),이영제(YoungZe Lee) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.6
Friction and wear characteristics of ceramic coatings on anodized aluminum alloy surfaces are studied. The friction coefficient of TiAlN coating is highest among three coatings. For the wear, the hardness of coatings are higher than that of anodized aluminum alloy, so that anodized aluminum alloy is worn out abrasively by coatings. The width of friction coefficient is affected by formation and destruction of transferred layer. For TiAlN and CrN coatings, the repetition of formation and destruction of transferred layer is so active and the width of friction coefficient is large.
미끄럼 마찰시 생성되는 고탄소강의 열변형층이 트라이볼로지 특성에 미치는 영향
이성애(Sungae Lee),조대현(Daehyun Cho),이영제(Youngze Lee) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.6
There have been many studies about white layers generated in various manufacturing processes such as hard turning, grinding, reaming. There are two different opinions on its wear characteristics. It is considered to be tribological adventage in some instance, but should decrease wear resistance because of forming micro crack and void. In this study, Ball-on-Disk type tester was used for sliding test with SUJ2 specimen due to understand the effect of white layer on friction and wear property. Surface profiler was used for investigating change of surface profiles, and transformation of micro structure was observed by FE-SEM on cross section of specimen after chemical etching.
김진선(Jinseon Kim),이영제(YoungZe Lee) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.6
The nuclear fuel cladding tubes which are a key component in nuclear power plant are damaged by the fretting wear caused by FIVs. Those are also interfered with severe environments such as high temperature, high pressure, radioactivity etc. Therefore the fretting wear tests were conducted using the nuclear cladding tube treated by the corrosion under radioactivity environment. As the load increased, the corrosive layer was fractured quickly. In case that corroded layers were existed, the maximum friction forces and wear depths were relatively lower.
그라파이트 박막과 DLC 박막을 증착한 디젤 엔진용 피스톤 스커트와 실린더 블록의 마찰 특성
조대현(DaeHyun Cho),이성애(SungAe Lee),이영제(YoungZe Lee) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.6
In this study friction and wear characteristics between piston skirts and cylinder bores were investigated using the reciprocating wear tester in SAE5W40 oil condition. The relative motion between a piston skirt and a cylinder liner in a real engine is considered to reciprocation wear tester. The cylinder blocks were used as reciprocation specimens, and the piston skirt samples with graphite and DLC coatings were used as fixed pin.
반복 회전운동에서 코발트 크롬 합금과 미끄럼 접촉하는 돼지 무릎 관절연골의 접촉압력이 마찰계수에 미치는 영향
김환(Hwan Kim),이권용(KwonYong Lee),이영제(YoungZe Lee) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.6
In this study, we investigated the influence of contact pressure on the coefficient of friction between porcine knee joint cartilage and Co-Cr alloy in repeat pass sliding motion. Cartilage pin specimens (9㎜ diameter, 8㎜ long) were prepared from porcine (6 months old) knee joints cartilage by a drill-type punch. Friction tests were conducted by using a pin-on-disk type friction tester for an hour in PBS lubricated condition under the contact pressures of 0.5, 1 and 2 ㎫ with 50 ㎜ distance per a cycle at ambient condition. As a result, coefficients of friction increased as the test durattion increased for all contact pressue. The maximum coefficients of friction were 0.082, 0.06 and 0.098 for 0.5, 1, and 2 ㎫, respectively. It showed that coefficients of friction of porcine knee joint catilage against Co-Cr alloy depended on the level of contact pressure and related to squeeze film lubrication mechanism.
실리카(SiO₂)입자 유입에 따른 고무-씨일부품의 마찰ㆍ마멸특성
정순오(Soonoh Chung),원영덕(YoungDuck Won),이영제(YoungZe Lee),김기훈(Gi-Hoon kim),김대성(Daesung Kim) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.6
In automobile chassis system, the inflow of dust particle weakens durability of automobile's components increasing for wear and friction. Especially, the inflow of dust particle in rubber-seal makes noise and has a bad influence upon life-time of automobile's components. In this study friction and wear characteristics of rubber-seal for the inflow of dust patricle were investigated using the sliding wear tester. The test is a type of ball-on-disk ; ball is a steel, disk is a rubber-seal, and We use a SiO₂ particle, because SiO₂ particle is a main ingredient of dust.
실리카(SiO₂)입자의 유입량에 따른 고무ㆍ씨일부품의 마멸특성 평가 및 메커니즘 분석
원태영(Taeyeong Won),박세민(Semin Park),이영제(YoungZe Lee),김기훈(Gi-Hoon kim),김대성(Daesung Kim) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.6
The chassis system of the mobile components is weakened by the inflow of dust particles. The inflow of dust particle weakens the durability of automobile’s components and also weakens the driving ability by increasing wear and friction in the rubber-seal components among the chassis systems. In this study wear characteristics and mechanism analysis of rubber-seal for the inflow of dust particles were investigated using the sliding wear tester. The tester is a type of ball-on-disk ; ball is a steel, disk is a rubber-seal. and We used five kinds of the amount of SiO₂ particles 0g, 0.5g, 1g, 1.5g, 2g 2.5g in water, because SiO₂ particle is a main ingredient of dust.
신재운(JaeUn Shin),박진확(JinHwak Park),이영제(YoungZe Lee) 한국트라이볼로지학회 2017 한국윤활학회지(윤활학회지) Vol.33 No.4
The feel of writing is important to customers when they buy smart devices with stylus such as smartphones and tablet computers. With an aim to reproduce the tactile sensibility of writing instruments when people write on the glass display using a stylus, this study focuses on the frequency characteristics of writing instruments that can describe the vibrations of writing instruments sliding over counter surfaces. In addition, this study includes the effect of various factors influencing the friction of writing instruments such as lubricant, nib material, and contact type. We perform sliding experiments with six types of writing instruments and a sheet of paper to understand the relation between the friction conditions of the nib and the frequency characteristics. As this research focuses on the tactile perception of human skin when people use a writing instrument, the analysis of frequency characteristics is performed in the perceptible frequency range of mechanoreceptors in the human skin. As a result, three types of frequency characteristics are identified. Low frequency peaks are observed for a metal nib with ink; high frequency peaks are observed for a nib without ink; and, middle frequency peaks with a wide range of distribution occurs for fabric nibs with ink. Therefore, to implement the proper feel of writing, at least three types of vibrations have to be made.
실리카(SiO₂)와 알루미나(Al₂O₃)입자에 대한 고무ㆍ씨일부품의 마찰ㆍ마멸특성
원태영(Taeyeong Won),정순오(Soonoh Chung),이영제(Youngze Lee),김기훈(Gi-Hoon kim),김대성(Daesung Kim) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.11
The chassis system of the mobile components is weakened by the inflow of dust particles. The inflow of dust particle weakens the durability of automobile's components and also weakens the driving ability by increasing wear and friction. in the rubber-seal components among the chassis systems, the inflow of the dust particle increases the wear and friction. Therefore those make the noise and have a bad influence on the mobile system. In this study friction and wear characteristics of rubber-seal for the inflow of dust particles were investigated using the sliding wear tester. The tester is a type of ball-on-disk ; ball is a steel, disk is a rubber-seal. and We use a SiO₂ and Al₂O₃ particles, because SiO₂ particle is a main ingredient and Al₂O₃ particle is second ingredient of dust.