Wear and Friction of Mechanical Carbons in Liquid Oxygen as Influenced by Transfer Films

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Abstract
Experimental wear and friction studies were conducted with a series of mechanical carbons sliding against metal surfaces in liquid oxygen (-298 F) at sliding velocities to 6500 feet per minute and a load of 1000 gm. The data reported shows that dense highly graphitic carbons have potential use as seal and bearing materials for liquid oxygen applications. High density graphitic carbons with a greater oxidation resistance and a greater capability of forming a transfer film gave the lowest wear and friction. Metals that form the most stable oxide films promote greater adherence of the graphite to the mating surface. Impregnated carbons must be selected with caution because frictional heating generated during sliding can initiate hazardous reactions between oxygen and certain unstable organic compounds.

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