LUBRICITIES OF SUPER FINE SIO2 PARTICLE AS A SOLID LUBRICANT

The effect of the anti-galling and wear resistance of super fine SiO2 particles (7-40 nm in mean diameter) were investigated by using a Fale x (pin/vee block) friction testing machine, when they were added into lithium soap-lubricating grease as solid lubricants. The SiO2-added gr eases showed higher seizure loads and less wear amounts as compared wi th no-added grease. Especially, the addition of the finest 7 nm-SiO2 p articles with the oleophilic surface treatment showed the highest seiz ure load, The lubricating actions of these super fine SiO2 particles a re due to their existences at the friction interface which decrease th e metallic contact between frictional surfaces, thus result in high se izure loads and antiwear properties.