Abstract
Friction, wear and tribocorrosion properties of 316L stainless steel were studied when sliding against ultra high molecular weight polyethylene (UHMWPE) or against alumina. 316L stainless steel and UHMWPE are widely used as femoral head and acetabular cup in hip prostheses. In this paper, tribological properties of this couple of biomaterials have been studied. The experiments were conducted in saline solution between metallic balls of various roughness values and UHMWPE samples using a ball on disc reciprocating tribometer and a hip joint simulator built in the authors' laboratory. The results clearly show that friction and wear of the polymer depend strongly on the roughness of the steel balls. These results are discussed and compared to previous experimental data. Tribocorrosion of 316L stainless steel was also studied when sliding in saline solution against an alumina ball. The effect of the normal load and the electrochemical applied potential on friction and wear of the metal have been discussed in terms of passivating film stability and repassivation kinetics.
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