Abstract
Further evidence of chemical and mechanical mechanisms contributing to the wear process was obtained. Single‐crystal sapphire spheres were worn by a rotating steel plate, unlubricated, at sliding speeds from 1000 to 2000 fpm and loads of 2 and 4 lb. Electron microprobe analysis, Becke line analysis, and electron photomicrographs confirmed the gradual buildup of the FeO.Al2O3 spinel on the wear surface. Wear rate anisotropy as a function of sliding direction on a plane 12° to the basal plane correlated with the presence or absence of plastic flow as evidenced by slip bands. Fracture of the sapphire during wear was a function of crystal perfection and sliding direction on the basal plane.
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