Surface and near surface hardened medical implants

Details Surface and near surface hardened medical implants Surface and near surface hardened medical implants

1993-08-26

1994-12-13

Roy, Upendra

Metal treatment

Stock

Titanium, zirconium, or hafnium base

148669, 420417, 623 16, 623 18, C22C 1400

Patent

active

053726600

ABSTRACT:
Surface and near surface hardened medical implants are provided. These implants are fabricated from titanium alloys that contain an amount of zirconium sufficient to permit the formation of a significant amount of zirconium oxide at the surface of the implant to cause surface hardening. Further, the zirconium-containing titanium alloy implants are characterized in having an alloy core with an oxygen-rich layer surrounding the core, and a surface layer, overlying the oxygen-rich layer, including mixed oxides of the metals present in the alloy. A zirconium-rich interface may sometimes be present between the oxygen-rich layer and the mixed-oxide surface layer. The method of producing these surface hardened implants includes the steps of heating the implant in an oxygen containing environment at a temperature sufficient to allow oxygen to diffuse to and react with the implant surface and near surface.

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