Abstract
In obtaining lubricant oils' properties under high pressure for tribo-CAD, a diamond-anvil pressure cell (DAC) was employed. A falling sphere viscometry in the DAC with appropriate heating system enabled the measurements up to 2 GPa at 200℃ for traction oils. Pressure-viscosity coefficient, which is important for EHL analysis and rolling fatigue estimation of machine elements, at 200℃ was 1/3 ∿ 1/4 smaller than that at 40℃. Density (volume) was obtained with DAC and with newly established laser confocal displacement sensor of 0.4μm resolution up to 6 GPa for several oils. Some high-pressure viscosity data are listed in web site homepage as databases, and anyone can access and utilize them for tribo-CAD.
