Nitrided powdered metal piston ring

Details Nitrided powdered metal piston ring Nitrided powdered metal piston ring

1995-12-21

1998-06-30

Jenkins, Daniel J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75244, 75246, 419 11, 419 13, 419 28, 419 29, 419 38, B22F 312, B22F 502, C22C 3302

Patent

active

057737347

ABSTRACT:
A powdered metal piston ring includes a structure of predominantly pearlite with a dispersion of metallic particles having an element with a high affinity for nitrogen. The ring is nitrided to form a hard surface layer at an outer periphery of the ring. The layer includes a first iron nitrided region and an adjacent region having greater hardness because of a reaction between the metallic particles and nitrogen. Preferred metallic particles include a high chromium steel alloy which forms part of the original powder metal of the piston ring.

REFERENCES:
patent: 2125606 (1938-08-01), Deeb
patent: 2741827 (1956-04-01), Koehler
patent: 2994600 (1961-08-01), Hansen
patent: 5226975 (1993-07-01), Denton et al.
patent: 5292381 (1994-03-01), Tsuchiya et al.

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