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INFLUENCE OF GEAR OIL FORMULATION ON OIL TEMPERATURE
D. WIENECKE,W. J. BARTZ 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
Friction losses in complex tribe-technical system are revealed primarily through their effect on the operating temperature level. In order to assess the influence of the oil formulation on the temperature level comprehensive tests were run in a model test apparatus consisting of a special adapter for the 4-ball test rig. More than ten with different formulations (different base oils, additive packages and viscosity modifiers) were tested. The resulting temperature levels varied by nearly 25%. The objective of this model testing is to assess the influence of the oil formulation on the operating temperature of vehicle manual transmission. The correlation to the real tribotechnical system was confirmed by a VW Polo transmission test.
Pandiyaraj, K.N.,V. Selvarajan,Heeg, J.,Junge, F.,Lampka, A.,Barfels, T.,Wienecke, M.,Rhee, Y.H.,Kim, H.W. Elsevier 2010 Diamond and related materials Vol.19 No.7
In this paper, diamond like carbon (DLC) films were coated on polyethylene terephthalate (PET) film substrate as a function of biasing voltage using plasma enhanced chemical vapour deposition. The surface morphology of the DLC films was analyzed by scanning electron microscopy and atomic force microscopy. The chemical state and structure of the films were analyzed by X-ray photoelectrons spectroscopy and Raman spectroscopy. The micro hardness of the DLC films was also studied. The surface energy of interfacial tension between the DLC and blood protein was investigated using contact angle measurements. In addition, the blood compatibility of the films was examined by in vitro tests. For a higher fraction of sp<SUP>3</SUP> content, maximum hardness and surface smoothness of the DLC films were obtained at an optimized biasing potential of -300V. The in vitro results showed that the blood compatibility of the DLC coated PET film surfaces got enhanced significantly.