Ferritic nitrocarburization process for steel balls

Details Ferritic nitrocarburization process for steel balls Ferritic nitrocarburization process for steel balls

1996-04-22

1998-02-03

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148219, 148906, 148319, B32B 1518, C21D 106

Patent

active

057140154

ABSTRACT:
A nitrocarburization treatment for steel components, such as steel balls or ball bearings is disclosed. In the process, the balls are treated in a nitrocarburizing environment and then reoriented, either inside or outside of that environment to form an epsilon iron nitride layer having some thickness over the entire surface of the ball and no bare spots. The reorientation process minimizes superficial metal flow at the surface of the balls and achieves consistent corrosion resistance of at least 96 hours in salt fog tests. Further, components that are cooled in a non-oxidizing environment and then reoriented prior to being returned to the nitrocarburizing environment develop a greater porous layer depth, which provides excellent oil retention for tribological applications.

REFERENCES:
patent: 4496401 (1985-01-01), Dawes et al.
patent: 4596611 (1986-06-01), Dawes et al.
patent: 4881983 (1989-11-01), Smith et al.
Dawes, et al., Nitrotec Surface Treatment Technology, Heat Treatment of Metals, 70-76 (1985).

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