Manufacture of high density, high strength isotropic graphite

Details Manufacture of high density, high strength isotropic graphite Manufacture of high density, high strength isotropic graphite

1978-03-03

1980-10-07

Smith, John D.

Coating processes

Heat decomposition of applied coating or base material

Coating decomposed to form carbide or coating carbonized

264 295, 427227, 427294, 427369, 427370, 427379, 4273855, B05D 302

Patent

active

042269008

ABSTRACT:
Methods of producing high density, high strength, homogeneous graphite articles having densities of 2 or more and isotropic ratios of about 1.05 or less are disclosed. These methods achieve densification to levels above 2 g/cc yet take greatest advantage of increases in all structural properties and maintain isotropic quality. They involve impregnation of pre-formed isotropic graphite substrates of high density, having an isotropic ratio of 1.05 or less, 15 to 35 percent total porosity of which at least 50 percent is interconnected and open to the surface, average pore diameters of 1.5 to 5 microns, and narrow pore size distributions. A vacuum is drawn on the substrate after which it is contacted with highly fluid impregnant such as petroleum or coal tar pitch and then carbonized, baked and graphitized under conditions correlated to increase density without detectably modifying graphite matrix structure. This variable correlation assures maximum strength increase commensurate with density increase and avoids degradation of desirable properties such as isotropic ratio.

REFERENCES:
patent: 2683107 (1954-07-01), Juel
patent: 3026214 (1962-03-01), Boyland et al.
patent: 3102047 (1963-08-01), Rivington
patent: 3462289 (1969-08-01), Rohl et al.
patent: 3517092 (1970-06-01), Peterson
patent: 3682686 (1972-08-01), Nakamura et al.

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