Ion implanation of titanium workpieces without surface discolora

Details Ion implanation of titanium workpieces without surface discolora Ion implanation of titanium workpieces without surface discolora

1986-05-12

1987-09-15

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148421, 148900, 20419231, C23C 1110

Patent

active

046937609

ABSTRACT:
A process for preventing surface discoloration in orthopedic implants made of titanium and its alloys is disclosed. Such surface discoloration is apt to occur when the orthopedic implants are ion implanted to improve their wear characteristics. The process essentially includes exposing all fixtures and shields, made of pure titanium, located in an implant chamber, to an ion beam, creating a vacuum within the chamber not exceeding about 5.times.10.sup.-5 torr, introducing an orthopedic implant within the chamber to be directly exposed to the beam, and reducing the ion beam current power density so as not to exceed about 1.0 watt/cm.sup.2. Exposing the fixtures and shields to the ion beam first serves to remove surface contamination therefrom, followed by forming a surface layer thereon. This surface layer effectively lowers the sputtering coefficient of the fixtures and shields, and thus reduces the amount of material sputtered from areas exposed to the ion beam to unexposed areas. Preferably, the vacuum is created by using an oil-free vacuum pump.

REFERENCES:
patent: 4465524 (1984-08-01), Dearnaley et al.
patent: 4490190 (1984-12-01), Speri
patent: 4568396 (1986-02-01), Vardiman
P. Sioshansi et al., "Wear Improvement of Surgical Titanium Alloys by Ion Implantation," J. Vac. Sci. Tech. A3 (6), Dec. 1985, pp. 2670-2674.
P. Sioshansi, "Ion Brass Modification of Materials for Industry", Thin Solid Films, 118 (12/1984), pp. 61-71.
J. M. Williams et al., "Ion Implantation of Surgical Ti-6Al-4V Alloy," Int'l Conference, Hidelberg, F.R.G., Sep. 17-21, 1984.
W. C. Oliver et al., "The Wear Behavior of Nitrogen-Implanted Metals," Met. Trans. 15A, Dec. 1984, pp. 2221-2229.

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