Abstract
Wear process in an alumina/alumina total hip prosthesis was investigated by edge-on-cylinder wear test simulating contact between the femoral head and the edge of the acetabular cup. It is found that micro-cracking causes rapid wear at the edge in running-in process. After that, the wear surface becomes smoother with an increase of wear surface and a decrease of contact pressure. Wear rate decreases and becomes negligibly small. If the wear particles remain in the contact region, wear grooves appear on the cylindrical surface due to three body abrasion. Destructive wear was not reproduced by the experiment while the possible mechanisms are discovered. A standard method of wear test is proposed based on the experimental result to evaluate ceramic materials.
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