Reinforced ceramic refractory
AssigneeStanton Advanced Ceramics, Inc.
InventorsKarl-Heinz Schofalvi, Evelyn McGee DeLiso
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Abstract
The disclosed invention relates to a reinforced ceramic refractory made from an as-batched composition comprising alumina; a rare earth oxide; an oxide of a transition metal comprising Sc, Zn, Ga, Y, Cd, In, Sn, Tl or a mixture of two or more thereof; and chopped ceramic fibers containing nanofibrils; the refractory exhibiting a modulus of rupture measured at 2500° F. (1371° C.) of at least about 2500 psi, as determined by the test method ASTM C583. A process for making the reinforced ceramic refractory is disclosed.
Claims14
A reinforced ceramic refractory made from an as-batched composition comprising:
- alumina;
- a rare earth oxide;
- an oxide of a transition metal comprising Sc, Zn, Ga, Y, Cd, In, Sn, Tl or a mixture of two or more thereof;
- and chopped ceramic fibers containing nanofibrils, the chopped ceramic fibers having an alumina content of at least about 95% by weight;
- the refractory exhibiting a modulus of rupture measured at 2500° F. (1371° C.) of at least about 2500 psi.
A process for making a reinforced ceramic refractory, comprising:
- wetting chopped ceramic fibers with an acidic solution for an effective period of time to form wetted chopped ceramic fibers containing nanofibrils, the chopped ceramic fibers having an alumina content of at least about 95% by weight;
- mixing the wetted chopped ceramic fibers with alumina particulates, particulates of an oxide of a transition metal comprising Sc, Zn, Ga, Y, Cd, In, Sn, Tl, or a mixture of two or more thereof, and particulates of a rare earth oxide to form an as-batched composition;
- and
- drying the as-batched composition and heating the as-batched composition at a sufficient temperature for an effective period of time to form the reinforced ceramic refractory.
Dependencies are inferred from the claim text.