Nitrided steel piston ring with oxide film

Details Nitrided steel piston ring with oxide film Nitrided steel piston ring with oxide film

1985-01-23

1986-04-01

Ward, Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277224, 277235A, F16J 900, F02F 500

Patent

active

045793557

ABSTRACT:
A steel piston ring comprises a base material of stainless steel, a nitrided layer covering at least the edge of the ring adapted to slide along a cylinder wall of an internal combustion engine, and an oxide film over the nitrided layer on the edge of the ring. Suitable oxide films include phosphate oxide and triion tetroxide.

REFERENCES:
patent: 2905512 (1959-09-01), Anderson
patent: 3900200 (1975-08-01), Nakamura
patent: 4077637 (1978-03-01), Hyde et al.
patent: 4106782 (1978-08-01), Hyde et al.
patent: 4407515 (1983-10-01), Naito
The Iron Age, "Case Hardening with Nitrides," Aug. 5, 1926, pp. 340 and 341.

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