Method for manufacturing carbon material having good resistance

Details Method for manufacturing carbon material having good resistance Method for manufacturing carbon material having good resistance

1990-07-18

1992-05-19

Beck, Shrive

Coating processes

Heat decomposition of applied coating or base material

427228, 427296, 427322, 4273762, 427379, 427387, B05D 302

Patent

active

051147491

ABSTRACT:
A method for manufacturing carbon material having good resistance to oxidation, comprising coating carbon material, which is a sintered body or a porous body, with an inorganic polysilazane; heating the carbon material coated with the inorganic polysilazane in an inert atmosphere to form amorphous silicon nitride on the surface of the carbon material; and reheating the heated carbon material in a non-nitriding and non-oxidizing atmosphere, the amorphous silicon nitride being decomposed and silicon carbide being formed on the surface of the carbon material; the reheating being conducted at a temperature of 1300.degree. C. to 1900.degree. C. and the non-nitriding and non-oxidizing atmosphere having a partial pressure of nitrogen determined with reference to a graph wherein the abscissa is a temperature in .degree.C. and the ordinate is partial pressure of nitrogen in atmospheres, the partial pressure being defined within an area under a line connecting a first point corresponding to 1300.degree. C. and 0.1 atmospheres and a second point corresponding to 1900.degree. C. and 20 atmospheres.

REFERENCES:
patent: 3853567 (1974-12-01), Verbeck
patent: 4678688 (1987-07-01), Itoh et al.
patent: 4696827 (1987-09-01), Okamura et al.
patent: 4843043 (1989-06-01), Nishio
patent: 4935199 (1990-06-01), Nishio et al.

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