| 摘要 |
PURPOSE:To produce an oxidation resistant C/C composite material (carbon fiber reinforced carbon composite material) having high stable oxidation resistance by simplified treating operation. CONSTITUTION:In a 1st coating process, an SiC coating film having a functional by grodient structure is formed on the surface of a C/C composite material as a base material by contact with a gaseous silicon source at a high temp. In a 2nd coating process, an SiC coating film is formed by a pulsing CVI method with a gaseous silicon source. In a 3rd coating process, a B2O3-SiO2 glass coating film is formed by vacuum-impregnating a liq. obtd. by hydrolyzing and polymerizing B(OC12H27)3 and Si(OC2H5)4 by an alkoxide method. A gaseous SiCl4- hydrogen mixture is used as the gaseous silicon source in the 1st coating process, a gaseous SiCl4-hydrocarbon mixture is used as the gaseous silicon source in the 2nd coating process and the 1st and 2nd coating processes are successively carried out in the same reactional system. |
