Abstract
In situ monitoring of metal transfer on various material surfaces has been studied using photostimulated exoelectron emission (PSEE) characteristics of aluminium transfer. The transfers studied were obtained with an aluminium pin sliding on disc surfaces of various ceramics, such as SiC, Si 3N 4, A1 2O 3, ZrO 2, and a polymer of nylon. For each material, the metal transfers were sensitively detected, demonstrating the usefulness of the PSEE technique for in situ monitoring of metal fragments transferred during sliding. The PSEE characteristics of the transfer were influenced by the UV spot size stimulating the electron emission and the intermittent time of the UV illumination. The intensity of the electron emission from the metallic transfer correlated well with the friction coefficient for a small number of repeated sliding traversals. The electron emission intensity increased linearly with increase in repeated sliding traversals.
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