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US 6,141,974 AGranted
Cryogenic and heat process for treating sintered carbide metals to increase service life
OwnerChristian Clark Waldmann, Fred J. Waldmanninventors
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Abstract
This disclosure relates to a process for treating sintered carbide metals, typically cutting tools and parts subject to high abrasive and corrosive wear, to enhance their service life. The process involves exposing the items to be treated to gaseous nitrogen for various periods of time with subsequent elevated heat treatment.
Claims3
A process for treating carbide metal items which comprises:
- holding a carbide metal item at a sustained temperature in the range of -20.degree. F. to -80.degree. F. for a period of at least 2 hours;
- applying gaseous nitrogen to said metal to lower, at a rate no faster than 3.degree. F. per minute, its temperature to within the range of -300.degree. F. to -320.degree. F.
- holding said temperature for a period of 2 to 24 hours;
- elevating the temperature of said carbide item to within the range of -80.degree. F. to -20.degree. F. and holding said temperature for a period of 2-24 hours;
- elevating the temperature of said carbide item to within the range of 300.degree. F. to 500.degree. F. for a period of about one hour;
- and
- allowing the temperature of the carbide metal item to return to ambient temperature.
4 more elements
Dependencies are inferred from the claim text.