Piston ring for internal combustion engine

Details Piston ring for internal combustion engine Piston ring for internal combustion engine

1981-07-24

1984-08-14

Padgett, Benjamin R.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75228, 419 11, 419 49, 291566, B22F 502

Patent

active

044655150

ABSTRACT:
To provide piston rings which are ductile, can be heavily thermally loaded, and are not attacked by corrosive residues occurring upon combustion of residual oil or other sulfur-containing heavy Diesel oils, a powder mixture is sintered in an isostatic hot-pressure sintering process in which a hard metal and a soft filler material are combined; in accordance with one embodiment, the base is a hard metal using nickel or cobalt-based alloys present in 40-80% by weight, the remainder filler which, for example, is unrefined or galvanically coated graphite; in a second embodiment, the base is a soft material such as a high-copper content bronze, and the filler is a nickel or cobalt-based alloy, with the base metal being present in 60-80%, the filler being the remainder (all percentages by weight). Isostatic hot compression results in piston rings which can operate, under emergency conditions, without, or with only insufficient lubrication, have high strength, resistance to attack by corrosive substances, and have sufficient ductility for simple assembly and long wear.

REFERENCES:
patent: 2196875 (1940-04-01), Sandler et al.
patent: 2250099 (1941-07-01), Hensel
patent: 2741287 (1956-04-01), Koehler
patent: 2881511 (1959-04-01), Boegehold
patent: 3419363 (1968-12-01), Sliney
patent: 3461069 (1969-08-01), Waldhuter
patent: 4039296 (1977-08-01), Levinstein
patent: 4222430 (1980-09-01), Lindner
Cameron et al., "Tribaloy Intermetallic Materials: New Wear & Corrosion Resistant Alloys", Anti-Corrosion, Apr. 1975, pp. 5-8.
Hirschhorn, Introduction to Powder Metallurgy, American Powder Metallurgy Institute, N.Y., (1969), pp. 107-109.
A. F. Belov et al.--Soviet Physics Doklady, vol. 24, No. 7, Jul. 1979, pp. 569-571.
H. C. Yeh et al.--American Ceramic Society Bulletin, vol. 58, No. 4, Apr. 1979, pp. 444-447.

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