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이영제 成均館大學校 科學技術硏究所 1995 論文集 Vol.46 No.2
The friction and wear behaviors of SiC against steels with lubricants were investigated and compared with those observed in air. Lubrications were done by water and commercial engine oil as received. Steels with 0.2 wt.% C were heat treated to obtain tempered structure. A cylinderon-plate tribometer with rotated sliding motion was used to carry out the experiments. In the experiments reported here, the range of different testing speeds and loads was used. It was found that the friction and wear characteristics of tested pairs were significantly influenced by environments. Two environments reduced wear of SiC by two digits compared with dry sliding at the same values of the frictional power, which are the products of the friction coefficient, the load and the sliding speed. Th frictional power showed very good relations with the wear rates of SiC.
李英悌 홍익대학교 산업기술연구소 1994 産業技術 Vol.4 No.-
Within the practical ranges of speed and load. The formation of transfer film and the consequent effects on the friction and wear behavior of ceramic materials during repeat pass sliding contact was studied. This was done using a steel and three ceramics viz silicon nitride alumina and silicon carbide with a cylinder on flat test configuration. The transfer film whenever formed is strongly attached enough to resist being siped off by the slider. As a consequence the formation of this film leads to a decrease in the wear rate because of the protection role of the film The presence of the film at the contack interface also results in high friction.
李英悌 홍익대학교 산업기술연구소 1994 産業技術 Vol.3 No.-
The Characteristics of lubricating oils are very important to prolong the life of automotive engines. The proper selection of oils will increase the power of engines and decrease the air pollution. Most reports on this area focused on the chemical and metallurgical aspects. On mechanical aspect the frictional force and the wear rates are critical parameters by which consumer can selects the oils. In this paper, three oils (two domestic, one imported) are used to make some plot for frictional forces and wear rates. From the plots, it is very simple to compare the characteristics of lubricating oils.
이영제,김진욱,Lee, Yeong-Je,Kim, Jin-Uk 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.4
Break-in is an intentional treatment to enhance the performance life of machinery parts and to maintain static friction behavior. Most studies on break-in have concerned only about surface conditions such as roughness or film formation. But the exact mechanism of break-in has not been found yet. Friction, scuffing behavior and wear of AISI 1045 were studied in relation to break-in and residual stress. The cylinder-on-disk type tribometer was used with the line-contact geometry. Scuffing tests were carried out using a constant load of 730N. In the break-in procedure the step load was applied from 100N to 200N. In this experiment, it was found that the break-in helps compressive residual stress to be formed well enough to enhance the scuffing life during the scuffing test. Specimens that had high compressive residual stress induced by shot-peening show better wear resistance than those were not shot-peened. Results of scuffing test, break-in procedure and wear amount in relation to residual stress have been discussed.