Metal treatment – Process of modifying or maintaining internal physical... – Carburizing or nitriding using externally supplied carbon or...
Patent
1993-03-15
1994-05-03
Roy, Upendra
Metal treatment
Process of modifying or maintaining internal physical...
Carburizing or nitriding using externally supplied carbon or...
420436, 623 16, 623 18, 623 23, B22F 100, A61F 200
Patent
active
053084128
ABSTRACT:
A method of surface hardening cobalt-chromium based orthopedic implant devices, and a cobalt-chromium orthopedic implant device prepared by the disclosed method. An orthopedic implant device made of a cobalt-chromium or cobalt-chromium-molybdenum alloy, such as ASTM F-75 or ASTM F-799 is exposed to molecular nitrogen gas or ionized nitrogen at a process temperature and for a process time duration sufficient to enhance surface hardness and wear resistance properties, without the formation of a measurable nitrogen layer that tends to increase surface roughness and brittleness and diminish wear resistance properties. The process temperature is in the range of 500.degree. F. to 2400.degree. F., preferably about 1400.degree. F., and the process time duration at the preferred process temperature is approximately 48 hours. The hardened surface of the cobalt-chromium-molybdenum implant occurs primarily due to nitride formation and solid solution hardening of the cobalt-chromium-molybdenum with nitrogen and oxygen, by dissolution.
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Ottersberg Walter H.
Shetty H. Ravindranath
Dawson Todd A.
Roy Upendra
Zimmer Inc.
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