Abstract
In this investigation, a set of plasma sprayed ceramic oxide coatings were surface ground using super abrasive wheel. The surface integrity and grindability aspects of the coated surface were studied. During the grinding process, low grinding forces and specific grinding energy were observed and these observations pointed toward micro brittle fracture to be the predominant material removal mechanism in all cases. SEM and FIB milling of the ground samples also revealed that material removal is primarily owing to micro-fracture rather than micro-cutting. This is also corroborated by short broken chip formation during grinding. Further, the nature of the chips did not vary with change in grinding parameters. The surface topography showed signatures of micro-fracture, plowing and rubbing only. The ground surface harbors residual stress. However, this stress, unlike metals, does not have a thermal origin. This is attributed to retention of material properties by the ceramic coatings at the grinding temperature.
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