Lubricities of Complex Oxides Sr_xCl_(1-x)CuO_2 as Solid Lubricants in Oil Boundary Lubrication

摘要

Complex oxides Sr_(0.14)Ca_(0.86)CuO_2, SrCuO_2, and CaCuO_2 were prepared from SrCO_3, CaCO_3, and CuO by sintering method. The powered complex oxides were added to three paraffinic base oils having different viscosities, and their lubricities in oil boundary lubrication were evaluated using a Falex-type tribometer.When these complex oxide powders were added to the base oil of very low viscosity, they improved the lubricity of the base oil even with addition of low concentration (2-5 mass%). Furthermore, these lubricities were enhanced by using the base oil and oleic acid together as an oiliness agent and dispersant. Especiaaly, Sr_(0.14)Ca_(0.86)CuO_2 having an infinite layer structure indicatede better friction propertes and also better wear resistance even by using it together with oleic acid and the low viscosity base oilw.