Titanium prosthesis mfg. method

摘要

The method involves the shot peening of at least the surface of the prosthesis which is to be subjected to stress in use with steel balls. The balls are Type S 110 and the coverage is at least 150 %. The intensity of the peening is between 0.1 and 0.25 Almen-A. The peening process may involve glass beads to reduce nickel contamination. After the treatment, a compressive stress and an increase in hardness can be measured in the surface of the titanium or titanium alloy. The phase up to the formation of cracks in fatigue testing is increased and an obstruction to displacement at the edge of cracks is provided.