Process for the production of valve seat rings

Details Process for the production of valve seat rings Process for the production of valve seat rings

1985-04-11

1986-07-08

Lechert, Jr., Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

291571R, 291567R, 291567A, 75246, 75252, 75255, 75123K, 75231, 1481261, 148127, 418178, 418179, 419 5, 419 14, 419 26, 419 28, 419 30, 419 66, 419 46, 251359, C22C 2900

Patent

active

045991103

ABSTRACT:
A process for the production of valve seat rings by powder metallurgy wherein molybdenum disulfide in the range of about 0.5% to 1.5% by weight is added to a powder mixture containing 0.8% to 1.5% by weight graphite, 1.0% to 4% by weight lead, 0.5% to 5% by weight nickel, 1.2% to 1.8% by weight molybdenum, 9.6% to 14.4% by weight cobalt, and the remainder iron. The resulting powder mixture is pressed into valve seat rings at a pressing force between 40 and 60 and preferably 50 KN/cm.sup.2. The rings are then sintered in a neutral atmosphere at a temperature of 1100.degree. C. to 1200.degree. C., finally compressed at a pressing force above 120 KN/cm.sup.2 and heat-treated if required. The resulting valve seat rings have greatly improved wear properties when used in internal combustion engines using lead-free gasoline.

REFERENCES:
patent: 3918923 (1975-11-01), Inoue
patent: 4204031 (1980-05-01), Takemura et al.

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