Abstract
Adhesion, friction, wear and lubrication studies conducted in a vacuum environment have provided insight into the influence of the basic properties of materials on the aforementioned characteristics. With metals, crystal structure, orientation, order-disorder reactions, ductile to brittle transitions, texturing and segregation of alloy constituents to surfaces have all been found to affect adhesion, friction and wear. Strong chemical interactions at the interface have been observed with clean metal surface in contact with polymers and ceramics. These interactions result in strong adhesive bonding. Nearly any material when adsorbed on or reacted chemically with a clean surface in vacuum will reduce adhesion, friction and wear. Even fractions of monolayers will accomplish a reduction in adhesion, friction and wear from that observed for materials in the atomically clean state.
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