Composition useful as mortar or coatings refractories

摘要

This invention relates to a composition comprising: ceramic refractory particulates made from alumina, one or more rare earth oxides, one or more oxides of a transition metal, the transition metal being Sc, Zn, Ga, Y, Cd, In, Sn, Tl, or a mixture of two or more thereof; an alumina and phosphate containing composition; and water. The composition is free of SiO2 or substantially free of SiO2, and is useful as a mortar or coating for molten aluminum or steel contact refractories.

主权项

1. A composition, comprising:
an aggregate for addition to mortar made from an as-batched refractory composition which comprises alumina particulates, one or more rare earth oxides, and one or more oxides of a transition metal, the transition metal being Sc, Zn, Ga, Y, Cd, In, Sn, Tl, or the oxide of a transition metal being a mixture of two or more transition metal oxides, the as-batched refractory composition being fired to form a ceramic refractory; wherein the as-batched refractory composition for making the aggregate for addition to mortar further comprises chopped ceramic fibers containing nanofibrils, alumina fibers, or a mixture thereof; wherein the nanofibrils extend the surface area of the chopped ceramic fibers by at least about 100 times the surface area of the chopped ceramic fiber without the nanofibrils; a phosphate and alumina containing composition; and water; the composition being free of SiO2 or substantially free of SiO2.