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채영훈,박병희,김석삼,Chae, Young-Hun,Park, Byung-Hee,Kim, Seock-Sam 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.7
The sliding wear behavior of $Al_2O_3/NiCr$ coating deposited on steel(SM45C) was investigated under lubrication. The parameters of sliding wear are normal loads, coating thickness. As a result, the wear resistance of $Al_2O_3/NiCr$ coating was remarkably greater than that of $Al_2O_3$ coating. The optimized coating thickness was found to be $300{\mu}m$ to ensure good anti-wear. The bond coating played important role in decreasing residual stress. The residual stress had much influence on wear mechanism. These results were correlated with the stress state of coating and the microstructure of coating.
플라즈마 코팅한 주조용 알루미늄합금의 마찰 및 마멸특성
채영훈,임정일,박준목,김석삼,Chae, Young-Hun,Ren, Jing-Ri,Park, Jun-Mock,Kim, Seock-Sam 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.5
The wear characteristics and wear mechanisms of plasma sprayed Al/sub 2/ O/sub 3/-40%TiO/sub 2/ and Cr/sub 2/O/sub 3/ deposited on casting aluminum alloy(AC4C) were investigated. Specimens were processed for various coating thicknesses. Ball on disk type wear tester was used for wear test. The scratch test on plasma sprayed coating surface showed that critical load to break the coating layer was greater than 40 N. The critical load increase with the increase of coating thickness of specimens. The friction coefficient of Cr/sub 2/O/sub 3/ coating layer was less than that of Al/sub 2/O/sub 3/-40%TiO/sub 2/ coating layer. The wear resistance of Cr/sub 2/O/sub 3/ coating layer was greater than that of Al/sub 2/O/sub 3/-40%TiO/sub 2/ coating layer. Microscopic observation of worn surfaces was made by SEM. SEM observation showed that the main mechanism of wear for Al/sub 2/O/sub 3/-40%TiO/sub 2/ coating layer was abrasive wear under 50 N. For the case of Al/sub 2/O/sub 3/-40%TiO/sub 2/ coating layer, as the surface cracks perpendicular to sliding direction propagated, the wear debris was generated in wear track. However, the main mechanism of wear for Cr/sub 2/O/sub 3/ coating layer was brittle fracture under 150 N.
나노/마이크로 압입 시험에 의한 플라즈마 세라믹 용사코팅의 특성 평가
최세영(Se-Young Choi),채영훈(Young-Hun Chae),김석삼(Seock-Sam Kim) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
The most controversial topics in plasma sprayed ceramic coating systems are recently mechanical properties such as bond strength, cohesive strength, toughness and so on. In this research, critical fracture load(Pc) and interface toughness(Ks) of four coatings materials were computed from the applied load, crack length and Young's modulus data which were measured by micro-vickers and nano indentation test. It is reasonable to consider the Pc value as comparison data of bond strength, and the Kc value, considering a trace of indent in the interface, was computed by a modified (E/H)I<SUP>½</SUP> ratio. In the case of the high loads (9.8N and 19.6N) in the Al₂O₃+13%TiO₂ coating, the critical point(Pco) at which the coating was broken was found. Also, used by a XRD phase analysis, we checked a change of coating' s properties, predicting a possible change of the phases in plasma sprayed coating.
포토리소그래피를 이용한 micro-scale surface pattern 밀도에 따른 미끄럼 마찰저감효과
채영훈(Young-hun Chae),김석삼(Seock-sam Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.8
Surface texturing of tribological application is another attractive technology of friction reducing. Also, reduction of friction is therefore considered to be a necessary requirement for improved efficiency of machine. In this paper attempts to investigate the effect of density for micro-scale dimple pattern on bearing steel flat mated with pin-on-disk. We demonstrated the lubrication mechanism for a Stribeck curve, which has a relationship between the friction coefficient and a dimensionless parameter for lubrication condition. It is found that friction coefficient is depended on the density of surface pattern. It was thus verified that micro-scale dimple could affect the friction reduction considerably under mixed and hydrodynamic lubrication conditions from based on friction map. Lubrication condition regime has an influence on the friction coefficient induced the density of micro dimple.
Crosshatch micro-scale grooved surface pattern 의 미끄럼윤활접촉에서 pattern 각도 방향에 따른 마찰특성
채영훈(Young Hun Chae),김석삼(Seock Sam Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Some surface pattern of tribological applications is an attractive technology of engineered surface. Therefore, friction reduction is considered to be necessary for improved efficiency of machines. This study investigated the effect of friction property for angles of micro-scale crosshatch grooved surface pattern on bearing steel flat mated with pin-on-disk. We obtain sample which can be fabricated by photolithography process. We discuss friction property depend on an angle of cross-hatch grooved pattern. We can verify the lubrication mechanism as a Stribeck curve, which has a relationship between the friction coefficient and a dimensionless parameter under the lubrication condition. It was found that the friction coefficient was related to angle of crosshatch on surface, even when surface pattern was the same density.
혼합 및 유체윤활하에서 Micro-scale Dimple Pattern의 마찰특성
채영훈(Young-Hun Chae),김석삼(Seock-Sam Kim) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.2
Surface texturing of tribological application is another attractive technology of friction reducing. Also, reduction of friction is therefore considered to be a necessary requirement for improved efficiency of machine. In this paper attempts to investigate the effect of density for micro-scale dimple pattern on bearing steel flat mated with pin-on-disk. We demonstrated the lubrication mechanism for a Stribeck curve, which has a relationship between the friction coefficient and a dimensionless parameter for lubrication condition. It is found that friction coefficient is depended on the density of surface pattern. It was thus verified that micro-scale dimple could affect the friction reduction considerably under mixed and hydrodynamic lubrication conditions from based on friction map. Lubrication condition regime has an influence on the friction coefficient induced the density of micro dimple.
Micro-scale Grooved Crosshatch Pattern의 각도 및 폭에 따른 실험적 미끄럼마찰특성
채영훈(Young-Hun Chae),김석삼(Seock-Sam Kim) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.2
The current study investigated the friction property of angle and width effect for micro-scale grooved crosshatch pattern on SKD11 steel surface against bearing steel using pin-on-disk type. The samples fabricated by photolithography process and then these are carry out the electrochemical etching process. We discuss the friction property due to the influence of a hatched-angle and a width of groove on contact surface. We could be explained the lubrication mechanism for a Stribeck curve. So It was found that the friction coefficient depend on an angle of the crosshatch on contact surface. It was thus verified that micro-scale crosshatch grooved pattern could affect the friction reduction. Also, it is play an important a width of groove to be improved the friction property. I was found that friction property has a relationship between a width and an angle for micro-grooved pattern.
Micro-scale surface texture 마찰특성
채영훈(Chae Young Hun),김석삼(Kim Seock Sam) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.10
The current study investigated the effect of micro-surface pattern to understand the potential benefits of friction reduction and durability in relative contact. It was verified that the friction property with respect to the surface feature and geometry factor under lubricated sliding contact. Additionally, it was recognized from Stribeck curve that the friction property has a connection with geometry factor. This can explain the relationship between the friction property and a dimensionless parameter for lubrication condition. It is suggested that the ratio of d/p is an important parameter for surface texture design.
마이크로 Crosshatch 그루우브 표면패턴의 각도에 따른 미끄럼 마찰특성
채영훈(Young Hun Chae) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.1
Some surface pattern of tribological application is an attractive technology of engineered surface. Therefore, friction reduction is considered to be necessary for improved efficiency of machine. This study investigated the effect of friction property for angles of micro-crosshatch groove surface pattern on bearing steel using pin-on-disk test. We obtain sample which can be fabricated by photolithography process. We discuss the friction property depend on an angle of crosshatch groove surface pattern. We can verify the lubrication mechanism as Stribeck curve, which has a relationship between the friction coefficient and a dimensionless parameter under the lubrication condition. It was found that the friction coefficient was related to angle of crosshatch groove pattern on contact surface.