Abstract
The sliding characteristics of the borides, carbides, nitrides, and silicides and oxides of several metals were investigated in air at temperatures up to 2000 F. Tests were of the crossed-cylinder type and friction and wear effects measured under repetitive sliding conditions. Correlation of the friction and wear characteristics with known or predicted solid solubility was only fair. High hardness coupled with low fracture strength and excessive brittleness of these materials produced fracturing of asperities and abrasive wear before a true measure of the adhesion could be obtained. Oxidation products were found to provide some lubrication at elevated temperatures, particularly the formation of B2O3 on boron carbide. However, none was effective at room temperature. Contributed by the A.S.L.E. Technical Committee on Lubrication Fundamentals and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Cincinnati, Ohio, April, 1960.
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