Method for producing corrosion resistant refractories
AssigneePraxair Technology, Inc.
InventorsWilliam Thoru Kobayashi, Elson Longo Da Silva, Carlos Alberto Paskocimas
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Abstract
Silica-based refractories are impregnated with protective material that is more resistant towards attack by corrosive species. The protective material coats the surface of the refractory matrix and fills some of the cavity volume of its pores, crevices, surfaces imperfections and irregularities. The protective material is positioned by impregnating the refractory with a precursor which, under the input of energy, is converted into the corrosion resistant protective material.
Claims5
A process for reconditioning a silica-based refractory article already subjected to high temperature and corrosive conditions in a furnace, to improve the corrosion resistance of the silica-based refractory article, comprising:
- (A) providing a silica-based refractory article already subjected to high temperature and corrosive conditions in a furnace;
- (B) impregnating the silica-based refractory article with a metal alkoxide precursor capable of being convened into a protective material;
- and
- (C) providing energy to the silica-based refractory article impregnated with said precursor and converting said precursor to said protective material thereby producing a silica-based refractory article impregnated with said protective material having improved corrosion resistance.
The process of clam 4 wherein the metal is from the group consisting of cerium, zirconium and tin.
Dependencies are inferred from the claim text.