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AssigneeThe United States of America as represented by the Secretary of the Interior
InventorArthur V. Petty, Jr.
Estimating the term…
A method for improving the high temperature properties of 42 to 70 percent by weight Al.sub.2 O.sub.3 containing alumina refractories by adding thereto a soluble metal compound and firing to at least 1450.degree. C. for a time sufficient to convert the soluble metal compound to a refractory oxide or phase and for the refractory oxide or phase to react with the non-Al.sub.2 O.sub.3 constituents of the refractory for preventing or reducing the presence or effect of detrimental compounds or phases on the high temperature properties of the refractory. The resulting relatively low Al.sub.2 O.sub.3 content, porous, alumina refractory includes within its pores from 1 to 10% by weight of a refractory oxide or phase and is characterized by high temperature property values substantially greater than the corresponding values for the same refractory body without said refractory oxide or phase in its pores.
A method for improving the high temperature properties of relatively low Al.sub.2 O.sub.3 content alumina refractories comprising the steps of:
A relatively low Al.sub.2 O.sub.3 content, porous, alumina refractory body comprising from 42 to 70 percent by weight Al.sub.2 O.sub.3, balance SiO.sub.2 and impurities, said body including within its pores from 1 to 10% by weight of a refractory oxide or phase of an ion selected from the group consisting of chromium, mixtures of chromium and iron, zirconium, calcium and molybdenum and characterized by high temperature property values substantially greater than the corresponding values for the same refractory body without said refractory oxide content in its pores.
Dependencies are inferred from the claim text.