Porous refractory cast material, its use and production
AssigneeVesuvius USA Corporation
InventorsDuane L. Debastiani, Xianxin Zhou
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Abstract
A porous refractory cast material contains a closed refractory aggregate fraction having a minimum particle size and a maximum particle size; the ratio of maximum particle size to minimum particle size is 10:1 or less. This closed refractory aggregate fraction comprises all of the porous refractory cast material having a particle diameter greater than 0.1 mm. The porous refractory cast material also contains a binder phase containing refractory selected from calcium aluminate cement, alumina phosphate, hydratable alumina, colloidal silica and combinations thereof. Also disclosed is a metallurgical vessel with an interior lining incorporating the porous refractory cast material.
Claims16
A porous refractory cast material comprising
- a closed refractory aggregate fraction comprising porous spherulites consisting essentially of alumina and having a minimum particle size and a maximum particle size, wherein the ratio of maximum particle size to minimum particle size is 10:1 or less;
- and
- a ferrous-capable binder phase comprising refractory binder selected from the group consisting of calcium aluminate cement, alumina phosphate, alumina formed from hydratable alumina, silica formed from colloidal silica and combinations thereof;
- wherein the closed refractory aggregate fraction comprises 100 wt % of the material having a particle diameter greater than 0.1 mm, and wherein the weight percentage of the aggregate fraction to the combined weight of the aggregate fraction and the binder phase is within the range from and including 85 weight percent to and including 98 weight percent;
- and
- wherein the porous spherulites have a foliated inner structure.
Dependencies are inferred from the claim text.