Patent ID: 9011811
Filing Date: 2015-04-21
Classification: C01B,C04B

Abstract:
1. A method of producing silicon carbide, comprising heating a cured product of a curable silicone composition in a non-oxidizing atmosphere at a temperature exceeding 1,500° C. but not more than 2,600° C., wherein prior to the step of heating the cured product, the curable silicone composition is molded into a desired shape of desired dimensions, and then cured to obtain the cured product, so that the silicon carbide is produced in the desired shape of desired dimensions after the step of heating; the curable silicone composition is an addition-curable silicone composition comprising: wherein a molar ratio of the silicon atom-bonded hydrogen atoms relative to all silicon atoms within a single molecule of component (b) is within a range from 0.2 to 2.0; and the component (b) is present in the curable silicone composition in a quantity such that the molar ratio of the silicon atom-bonded hydrogen atoms in the component (b) relative to the silicon-bonded alkenyl groups in component (a) is within a range from 0.1 to 5.0, wherein the component (a) is selected from a linear organopolysiloxane represented by any of the following formulas: wherein, R represents identical or different, unsubstituted or substituted monovalent hydrocarbon groups with the exception of not including alkenyl groups, b and c are integers that satisfy b≧0 and c≧1 respectively, provided that b+c is a number that yields a weight average molecular weight and a viscosity for the organopolysiloxane that fall within the ranges from 300 to 10,000, and from 1 to 10,000 mPa·s, respectively, wherein the component (b) is a linear hydrogenpolysiloxane selected from the group consisting of methylhydrogenpolysiloxane with both terminals blocked with trimethylsiloxy groups, copolymers of methylhydrogensiloxane and dimethylsiloxane with both terminals blocked with trimethylsiloxy groups, dimethylpolysiloxane with both terminals blocked with dimethylhydrogensiloxy groups, copolymers of methylhydrogensiloxane and dimethylsiloxane with both terminals blocked with dimethylhydrogensiloxy groups, copolymers of methylhydrogensiloxane and diphenylsiloxane with both terminals blocked with trimethylsiloxy groups, copolymers of methylhydrogensiloxane, diphenylsiloxane and dimethylsiloxane with both terminals blocked with trimethylsiloxy groups, copolymers of methylhydrogensiloxane, methylphenylsiloxane and dimethylsiloxane with both terminals blocked with trimethylsiloxy groups, and wherein the silicon carbide powder (d) is contained in the curable silicone composition within a range from 25 to 80% by volume relative to the entire curable silicone composition.