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차금환,김대은,Cha, Kum-Hwan,Kim, Dae-Eun 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.12
It has been well established that resistant force and wear that occur during rolling motion depend on several factors such as material type, hardness, subsurface microstructure, applied load, and speed. The purpose of this work is to investigate the effect of microstructure and the state of deformed layer on the rolling contact characteristics in dry and lubricated rolling contacts. The results of this work show that the rolling resistance behavior depends on the state of the deformed layer. Also, lubrication can reduce the plastic flow at the surface but may still have an effect on the subsurface strain. The cross-sectional view of the microstructure shows that surface traction has a difinite effect on the morphology of the surface region. That is, significant slip seems to have taken place between the ball than those of the dry rolling case. The surface generation effects were significantly less compared to the case of dry rolling contact.
다이아몬드상 카본 박막의 레이저공정 변수에 따른 상변이와 내마모성 특성변화
심경석,차금환,이상렬,김대은 연세대학교 산업기술연구소 1999 논문집 Vol.31 No.2
Diamond-like carbon(DLC) thin films have been fabricated by pulsed laser deposition method with various deposition parameters. The characterization of fabricated thin films was performed depending on the deposition parameters. As the kinetic energy provided by deposition temperature and the laser energy density were increased, the film showed graphite properties. Structural properties of the films were investigated by Raman spectroscopy. The growth energy should be optimized to fabricate high quality DLC thin films. DLC films showed high hardness and their friction coefficients were measured to be about 0.2 regardless of the load of the ball pin.