Method of making a refractory article
AssigneePyrotek High Temperature Industrial Products Inc.
InventorsMarcel Gouin, François Veillette, Alain Simard
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Abstract
A method of making a refractory article is provided. The method includes: a) mixing a binder system, a refractory charge, and a second colloidal binder to form an aqueous slurry; b) casting the aqueous slurry into a mold; c) subjecting the mold containing the aqueous slurry to a temperature that is lower than a slurry casting temperature for a time sufficient to form a green strength article; and d) firing the green strength article at a temperature of at least 450° C. for a time sufficient to achieve thermal homogeneity, thereby forming a refractory article. Refractory articles made in accordance with the method have a unique combination of pore structure and mechanical properties.
Claims19
A refractory article made by a method comprising:
- a) mixing a binder system, a refractory charge, and a second colloidal binder to form an aqueous slurry, wherein the binder system comprises from 2 wt % to 10 wt % of the aqueous slurry, the refractory charge comprises from 40 wt % to 75 wt % of the aqueous slurry, and the second colloidal binder comprises from 20 wt % to 50 wt % of the aqueous slurry;
- b) casting the aqueous slurry into a mold, wherein the aqueous slurry is at a slurry casting temperature;
- c) solidifying the aqueous slurry cast into the mold by freezing, thereby forming a green strength article;
- and
- d) firing the green strength article at a temperature of at least 450° C. for a time sufficient to achieve thermal homogeneity, thereby forming a refractory article, and
- wherein the binder system comprises a pre-caramelized, caramelized carbohydrate component, a first colloidal binder, and an adjuvant, and the refractory article has a globular pore structure and an isotropic distribution of pores.
Dependencies are inferred from the claim text.