Method for manufacturing high strength isotropic graphite piston

Details Method for manufacturing high strength isotropic graphite piston Method for manufacturing high strength isotropic graphite piston

1994-10-07

1996-06-11

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 296, 264122, 264349, 423448, C01B 3104

Patent

active

055252761

ABSTRACT:
A method for manufacturing a high strength isotropic graphite including a kneading step to mix an aggregate consisting of carbonaceous fine powder with a pitch binder a molding step to mold the raw material prepared by re-pulverizing the kneaded mixture using rubber press method and a carbonizing and graphitizing step to fire carbonize and graphitize the molded product. The aggregate uses a fine mosaic coke powder as the aggregate, which mosaic coke powder is finely pulverized in a jet mill to an average particle size of 1 .mu.m or less and a maximum particle size of 5 .mu.m or less, and has a surface average electrostatic field intensity of 1.2.times.10.sup.4 esu/cm.sup.2 or more. The invention provides a high strength isotropic graphite having a high bending strength of 120 MPa or more, which is suitable for piston components of gasoline engines and provides a method for manufacturing high strength isotropic graphite.

REFERENCES:
patent: 3969124 (1976-07-01), Stewart
patent: 4764318 (1988-08-01), Morgenstern et al.
patent: 4876077 (1989-10-01), Murakami
patent: 5069683 (1991-12-01), Fong et al.

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