Method of surface oxidizing zirconium alloys and resulting...

Details Method of surface oxidizing zirconium alloys and resulting... Method of surface oxidizing zirconium alloys and resulting...

A - Human Necessities

61

L

A61L 27/04 (2006.01) A61F 2/30 (2006.01) A61L 27/30 (2006.01) C23C 22/00 (2006.01) A61F 2/00 (2006.01) A61F 2/32 (2006.01) A61F 2/34 (2006.01) A61F 2/36 (2006.01) A61F 2/38 (2006.01) A61F 2/40 (2006.01)

Patent

CA 2284816

An oxide coating is formed on zirconium or zirconium alloys of refined microstructure by a process comprising at least the step of inducing an appropriate altered surface roughness such that subsequent oxidation results in a uniformly thick oxide coating. An oxide coating of uniform and controlled thickness is especially useful on orthopedic implants of zirconium or zirconium-based alloys to provide low friction, highly wear resistant surfaces on artificial joints, such as hip joints, knee joints, elbows, etc. The uniformly thick oxide coating of controlled depth on oxide coated prostheses provides a barrier against implant corrosion caused by ionization of the metal prosthesis.

On forme une couche d'oxyde, sur du zirconium ou des alliages de zirconium de microstructure fine, par un procédé consistant au moins à générer une rigidité appropriée de surface modifiée de sorte que l'oxydation ultérieure forme une couche d'oxyde épaisse et uniforme. La couche d'oxyde d'épaisseur uniforme et régulière est notamment utilisée dans les implants orthopédiques de zirconium ou d'alliages à base de zirconium de façon à générer une faible friction, une haute résistance à l'usure des surfaces des articulations artificielles telles que les articulations des hanches, des genoux, des coudes, etc. La couche d'oxyde sur les prothèses, d'épaisseur uniforme, et régulière en profondeur, forme une barrière contre la corrosion des implants, corrosion imputable à l'ionisation de la prothèse métallique.

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