CRUCIBLE FOR CRYSTAL PULLING AND METHOD OF MANUFACTURING SAME

摘要

The present invention is directed to a single crystal pulling crucible of carbon fiber reinforced carbon composite material formed by the filament windings by combination of axially reinforced layers as well as circumferentially reinforced layers, which combination is given in two or more sets, and to the producing method thereof. The cicumferentially reinforced layers resist a force tending to expand a drum portion of the crucible, and the axially reinforced layers resist a force tending to push down a bottom of the crucible. The axially reinforced layers extending from the bottom portion to the drum portion can be formed by at least either of a level winding of a contact angle of 0 DEG to 10 DEG with respect to the center axis and a poral winding, and the circumferentially reinforced layers in area adjacent to the drum portion out of the drum portion and the bottom portion can be formed by at least either of a parallel winding of a contact angle of 70 DEG to 90 DEG with respect to the center axis and a helical windin g. Whenthe axially reinforced layers cover the center of the bottom portion, an integral crucible of C/C composite material with no hole is provided. When the surface of the C/C composite material is impregnated and covered with a pyrolytic carbon, improved resistance to forming SiC is provided.