Abstract
Abstract The frictional behaviour of a hip prosthesis head fabricated from Ti-5%Al-2.5%Fe alloy in contact with an ultrahigh molecular weight polyethylene cup was investigated. It was shown that the frictional behaviour of a head coated with an oxide layer about 1–3 μm thick produced by induction heating of the surface is equal to that of a head fabricated from alumina ceramic. The oxide layer was still present after 107 cycles under maximum loads of 4000 and 3200 N in 0.9% NaCl solution. Examination of the microstructure of the oxide layer after testing showed that it was unchanged by the friction test under overload service conditions. The different oxidation layers on the α and β phases could still be observed. Therefore the production of such oxide layers on titanium and titanium alloy implants which are locally stressed by friction during service is recommended.
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