Internal combustion engine tappet comprising a sintered powdered

Details Internal combustion engine tappet comprising a sintered powdered Internal combustion engine tappet comprising a sintered powdered

1979-01-08

1980-10-28

Schafer, Richard E.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75244, 75246, 123 9051, 428566, C22C 3812, C22C 3814, C22C 3818, F01L 114

Patent

active

042304911

ABSTRACT:
An internal combustion engine tappet comprising a sintered powdered metal wear resistant composition having a matrix formed from iron powder, carbon in the range of 0.50-1.0% by weight, and a ferroalloy powder with a mesh size of +50-325 acting as a nucleus for diffusion of the alloying metal into the surrounding iron particles. The alloying metal in the composition is in the range of 1-10% by weight and is selected from the group consisting of chromium, titanium, boron, vanadium, columbium, molybdenum, tantalum and tungsten. The iron, carbon and ferroalloy are briquetted at a pressure of 40-60 tons/sq.in. and sintered, in solid phase, at a temperature of 2000.degree.-2100.degree. F. in a reducing atmosphere. The resulting product is heterogeneous and has hard ferroalloy nuclei and interconnected porosity with a density at the tappet wear surface of approximately 6.8-7.0 gm/cc.

REFERENCES:
patent: 3698877 (1972-10-01), Motoyoshi

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