PURPOSE: To obtain a high-strength carbon composite material having high isotropy in mechanical properties by previously producing silicon carbide on the outer surface of a specific carbon-fiber reinforced carbon composite material, then forming a silicon carbide film and impregnating the resultant film with boron oxide.
CONSTITUTION: Metallic silicon powder is applied to the outer surface of a carbon-fiber reinforced carbon composite material in which UD sheets of carbon fiber paralleled in one direction are pseudoisotropically laminated at 0°/90°/±45° and the resultant composite material is heat-treated in an inert atmosphere to previously produce silicon carbide on the outer surface thereof. A film composed of silicon carbide is then formed on the aforementioned outer surface by a vapor chemical reaction deposition method. The film is subsequently impregnated with boron oxide or a mixture of the boron oxide with silicon oxide to afford the objective composite material. In the above-mentioned method, for example, methods for reducing silicon tetrachloride with hydrogen and reacting a hydrocarbon such as methane therewith or thermally decomposing methyltrichlorosilane are used for forming the silicon carbide film.
ISHIHARA MASAJI
NOSE TASUKE
TAGUCHI MOTOYASU
YAMASHITA MASAYUKI
MITSUBISHI CHEM IND
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