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디젤 엔진오일 내 Soot 함량 증가에 따른 오염도 측정에 관한 실험적 고찰
조성용(S.Y. Cho),공호성(H. Kong),윤의성(E.-S. Yoon),한흥구(H.G. Han),정동윤(D.-Y. Jung) 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.35 No.-
New method and device for the on-line measurement of soot concentration in a diesel engine oil are proposed, where the measurement principle is based mainly on attenuated internal total reflection. Various laboratory tests of the detector were performed mainly with carbon black particles of different contamination levels. It was found that the proposed detector could be well used to monitor oil deterioration due to soot contamination. Operational range of the detector was found from 0 to 5 mass percentage of soot content. Test results with water and fuel dilution showed that these effects were not remarkable. However, adsorption of carbon black particles to a measurement surface was considered to be a critical problem in the new detector. Effects of particle deposition onto the interface was experimentally evaluated with the oil temperature and turbulence and discussed throughout this work.
공호성(H. Kong),한흥구(H.G. Han),김학열(H.Y. Kim),윤의성(E. S. Yoon) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
In order to enhance the lubricity of solid lubricants, they were lubricated with grease. In this work, PTFE and MoS₂ bonded type lubricants were coated onto a steel specimen and lubricated by either silicone or teflon grease. For the laboratory test, a ball-on-disk type friction tester and a LFW-1 friction tester were used and compared in term of friction and wear resistance. Test results showed that lubricating property of solid lubricants was governed mainly by grease lubricants and a PTFE sheet lubricated with a silicone grease yielded the lowest friction. MoS₂ bonded type lubricants, on the other hand, revealed an improper tribological characteristics when lubricated with greases. It was considered that grease lubricants hindered a beneficial running-in process of MoS₂ particles in the sliding surface and the frictional characteristics in the intial stage was affected greatly by the topography of coated surface.