Abstract
By using a new type of plasma discharge, thermionic vacuum arc (TVA), silver diamond-like carbon (DLC) composite overlays were prepared successfully for tribological applications. Carbon was incorporated into the silver matrix at concentration between 19 and 42 mass% as a function of the distance to the two TVA guns used to evaporate simultaneously silver grains and a graphite rod. It was found that the surface of the obtained overlays was smooth (5–10nm peak-to-valley roughness) as measured by atomic force microscope (AFM) in contact mode. Carbon inclusion as DLC phase in the silver matrix reduced the coefficient of friction in dry sliding up to 2.5 times compared to that of the bronze substrate.
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