Novel carbon-carbon composite material and method for its production
First Claim
9. A method for producing a carbon-carbon composite material consisting of a matrix carbon and a fibrous reinforcing carbon, which comprises heat-treating cured novolac fibers at a temperature of from 250°
- C. to less than 500°
C. in a non-oxidizing atmosphere;
shaping a resinous composition consisting of 30 to 90% by weight of the resulting heat-treated novolac fibers and 10 to 70% by weight, as the solids content after curing, of a phenolic resin;
curing the shaped product;
heating the cured product in a non-oxidizing atmosphere to at least 800°
C. in such a manner that at least within a temperature range of 200°
to 500°
C., the heating is carried out at a rate of not more than 60°
C. per hour; and
firing the product at the final temperature reached.
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Abstract
The present invention provides a carbon-carbon composite material consisting of a matrix carbon and a fibrous reinforcing carbon, said matrix carbon consisting substantially of optically anisotropic carbon and said fibrous reinforcing carbon consisting substantially of optically isotropic carbon, and said matrix carbon and fibrous reinforcing carbon forming an interface without an intervening third material, wherein said composite material has a fracture surface showing a uniform vitreous light reflection, and a method for the preparation thereof. The composite material has a high flexural strength and a very low gas permeability and is useful as a molding material in the fields of high temperature chemistry, the atomic energy industry and medicine.
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Citations
19 Claims
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9. A method for producing a carbon-carbon composite material consisting of a matrix carbon and a fibrous reinforcing carbon, which comprises heat-treating cured novolac fibers at a temperature of from 250°
- C. to less than 500°
C. in a non-oxidizing atmosphere;
shaping a resinous composition consisting of 30 to 90% by weight of the resulting heat-treated novolac fibers and 10 to 70% by weight, as the solids content after curing, of a phenolic resin;
curing the shaped product;
heating the cured product in a non-oxidizing atmosphere to at least 800°
C. in such a manner that at least within a temperature range of 200°
to 500°
C., the heating is carried out at a rate of not more than 60°
C. per hour; and
firing the product at the final temperature reached. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- C. to less than 500°
Specification