Milling tests and sliding tests were conducted to see how mechanochemical reactions influenced the friction and wear characteristics ลฝ . of Si N in normal-chain, n -alcohols. Si N powder was milled with n-alcohol to obtain mechanochemical reaction products. Silicon 3 4 3 4 alkoxide and long-chain hydrocarbons might be produced in the mechanochemical reaction between Si N and n-alcohols. Silicon 3 4
alkoxide were hydrolyzed to form silica gel to determine the yield by post-treatment. Silica gel was the main product in lower alcohol and hydrocarbons were the main products in higher alcohol. In the sliding tests, Si N was slid against the same material in CH OH and in 3 4 3 C H OH. Hydrodynamic lubrication, where the friction coefficient was -0.01, occurred in CH OH for sliding speed exceeding 1600 9 19 3 mmrs. Friction coefficient of Si N in C H OH was 0.05-0.11. Wear of Si N in CH OH was much higher than that in C H OH. 3 4 9 19 3 4 3 9 19
Precursors of silica gel, reduced friction of Si N in alcohol; hydrocarbons did not act as a lubricant, however. The specific wear rate of 3 4
Si N ball in the sliding test correlated very well with the yield of silica gel produced in the milling test. Our results suggest that friction 3 4 and wear of Si N are influenced by the reactivity of the mechanochemical reaction producing silicon alkoxide.