초록 ▼

High surface area open microporous, partially crystalline, partially amorphous, solid ceramic materials containing silicon carbide with or without silica with or without carbon may be prepared by controlled pyrolysis of (RSiO1.5)n gels in an inert atmosphere. The silica and carbon content, surface a

High surface area open microporous, partially crystalline, partially amorphous, solid ceramic materials containing silicon carbide with or without silica with or without carbon may be prepared by controlled pyrolysis of (RSiO1.5)n gels in an inert atmosphere. The silica and carbon content, surface area, and pore size and distribution may be altered by optional subsequent processing steps to selectively remove carbon and/or silica.

대표청구항 ▼

A method for forming a high surface area, open microporous partially crystalline, partially amorphous solid ceramic material consisting essentially of silicon carbide comprising: (a) synthesis of a gel having the idealized formula (RSiO1.5)n wherein R equals vinyl, allyl, or phenyl, the gel being th

A method for forming a high surface area, open microporous partially crystalline, partially amorphous solid ceramic material consisting essentially of silicon carbide comprising: (a) synthesis of a gel having the idealized formula (RSiO1.5)n wherein R equals vinyl, allyl, or phenyl, the gel being three dimensionally cross linked; (b) heating the gel at a rate of less than 10°C. per minute to a temperature of between 1200°C. and 1500°C. in an inert atmosphere and maintaining the temperature in the prescribed range until carbothermic reduction reaction to produce SiC proceeds to result in a high surface area, open microporous partially crystalline, partially amorphous solid ceramic material and thereafter reducing the temperature to ambient while maintaining the material in an inert atmosphere.