Patent ID: 8906288
Filing Date: 2014-12-09
Classification: C04B,D01F

Abstract:
1. A process for producing SiC fiber-bonded ceramics composed of: inorganic fiber made of SiC; and interfacial layers mainly made of carbon, comprising: a step of adding a compound containing at least one or more metal element among group IIA, group IIIA, and group IIIB metal elements to polysilane or a heating reaction product of the polysilane to form a resulting product and then heat-reacting the resulting product in an inert gas to obtain a metal element-containing organosilicon polymer; a step of melt-spinning, curing, and firing the metal element-containing organosilicon polymer to produce silicon carbide-based inorganic fiber; a step of forming the silicon carbide-based inorganic fiber into a certain shape to obtain a preform; and a step of vacuum-sealing the preform into a capsule and hot-isostatic-pressing the preform to obtain SiC fiber-bonded ceramics, wherein a ratio of a number of carbon atoms to a number of silicon atoms (number of C atoms/number of Si atoms) in the preform is 1.02 to 1.20, and before the hot isostatic pressing, the preform is heated in an inert gas atmosphere or a reducing gas atmosphere at a temperature of 1200° C. to 1800° C. to adjust oxygen content in the inorganic fiber to 6.0% by mass or lower, and then the hot isostatic pressing is carried out.