초록 ▼

Highly heat-resisting ceramic fibers are manufactured either by simply coating the surface of ceramic fibers with at least one phosphorus compound or by further subjecting the resultant coated ceramic fibers to a heat treatment. The ceramic fibers having the surface coated with said phosphorus compo

Highly heat-resisting ceramic fibers are manufactured either by simply coating the surface of ceramic fibers with at least one phosphorus compound or by further subjecting the resultant coated ceramic fibers to a heat treatment. The ceramic fibers having the surface coated with said phosphorus compound or the ceramic fibers having the phosphorus compound contained therein at a gradually decreasing concentration in the direction of increasing depth from the surface which are manufactured by the aforesaid method are capable of high resistance to heat.

대표청구항 ▼

Highly heat-resistant fibers possessing a thermal contraction under load of not more than 10% at a temperature of 1400°C., comprising: ceramic fibers composed predominantly of silica and alumina each present in the fibers in an amount of at least 25% wt.% and a combined amount of at least 80 wt.% an

Highly heat-resistant fibers possessing a thermal contraction under load of not more than 10% at a temperature of 1400°C., comprising: ceramic fibers composed predominantly of silica and alumina each present in the fibers in an amount of at least 25% wt.% and a combined amount of at least 80 wt.% and containing very small precipitated crystals of cristobalite and/or mullite close to the surface of the individual fibers, said precipitated crystals formed by heat treatment of said fibers coated with a phosphorus compound such that from 0.5 to 10% by weight based on P2O5 of said phosphorus compound is incorporated into said ceramic fibers, the size and distribution of said precipitated crystals to the fibers being controlled by the introduction of the indicated quantity of said phosphorus compound into said fibers. A method for preparing highly heat-resistant fibers possessing a thermal contraction under load of not more than 10% at a temperature of 1400°C., comprising: coating the surface of ceramic fibers containing silica and alumina each in an amount of at least 25 wt.% with a phosphorous-containing compound such that said fibers are coated with from 0.5 to 10% by weight of said phosphorous-containing compound; drying said coated fibers; and heat-treating said coated fibers to a temperature of at least 600°C.