A HOT-PRESSING METHOD OF MANUFACTURING A SIC FIBER-REINFORCED SIC-MATRIX COMPOSITE

摘要

A method for producing a SiC fiber-reinforced SiC composite material by means of a hot press, which comprises providing a powdery mixture comprising a SiC fine powder and, as a sintering auxiliary, a powder of one or more oxides selected from among Al2O3, Y2O3, SiO2 and CaO, admixing the powdery mixture with a SiC precursor resin and dispersing it homogeneously, to thereby prepare a resin slurry for forming a matrix, impregnating a SiC fiber formed product, which exhibits high crystalinity and has a nearly stoichiometric composition, with the resin slurry, and subjecting the impregnated product to hot pressing under pressure at a temperature of 1600 ~ or higher under a condition wherein a liquid phase is present. In the method, the use of a SiC fiber having high resistance to heat as a reinforcing fiber results in the production of a SiC fiber-reinforced SiC composite material having a high density and being excellent in mechanical properties by one time hot pressing with an elevated sintering temperature.