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United States Patent | 4,704,168 |
Salik , et al. | November 3, 1987 |
A surface of a steel substrate is nitrided without external heating by exposing it to a beam of nitrogen ions under a low pressure. The pressure is much lower than that employed for ion-nitriding, and an ion source is used instead of a glow discharge. Both of these features reduce the introduction of impurities into the substrate surface.
Inventors: | Salik; Joshua (Shaker Heights, OH), Hubbell; Theodore E. (Cleveland, OH) |
Assignee: |
The United States of America as represented by the Administrator of the
(Washington,
DC)
|
Appl. No.: | 06/823,713 |
Filed: | January 29, 1986 |
Application Number | Filing Date | Patent Number | Issue Date | ||
661481 | Oct., 1984 | ||||
Current U.S. Class: | 148/222 ; 427/528 |
Current International Class: | C23C 8/38 (20060101); C23C 8/06 (20060101); C21D 001/48 () |
Field of Search: | 148/4,16.6 204/192N 427/38 |
3341352 | September 1967 | Ehlers |
3832219 | August 1974 | Nelson et al. |
3900636 | August 1975 | Curry et al. |
4105443 | August 1978 | Dearnaley et al. |
4250009 | February 1981 | Cuomo et al. |