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US 5,578,255 AGranted
Method of making carbon fiber reinforced carbon composites
AssigneeMitsubishi Chemical Corporation
InventorsKouhei Okuyama, Kazuo Niwa, Toshihiro Fukagawa
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Abstract
Disclosed herein is a method for preparing carbon fiber reinforced carbon composites comprising: subjecting short fibers composed of bundles of multiple single fibers to dry or wet fibrillation; preparing a sheet oriented in the two-dimensional random direction; and after impregnating the obtained sheet with resins pitches and laminating the sheet followed by molding, subjecting the molded product to baking and densification treatments.
Claims12
A method for preparing carbon fiber-reinforced carbon composites comprising the steps of:
- (a) subjecting carbon fibers of 0.3 to 100 mm in length, composed of bundles of single fibers, to dry or wet fibrillation;
- (b) preparing a carbon fiber sheet by orienting said carbon fibers in the planar direction while the carbon fibers remain randomly oriented in the other two directions, wherein the sheet has a carbon fiber weight per area of 10 to 500 g/m.sup.2 ;
- (c) impregnating the prepared sheet with a matrix of resins or pitches;
- (d) laminating the impregnated sheet to produce a laminate;
- (e) molding the laminate to obtain a molded product;
- (f) baking the molded product to obtain a composite material;
- and
- (g) subjecting the baked composite material to a densification treatment.
5 more elements
Dependencies are inferred from the claim text.