Glass or quartz articles having high temperature UV absorbing coatings containing ceria
First Claim
1. A coated article comprising a substrate of glass or quartz and a coating having an absorbance of 1 to 3 per micron of thickness at 320 nanometers and consisting essentially of colloidal particles of cerium oxide in a silica-based matrix and having a minimum concentration on the order of 40 weight percent of cerium oxide based on the total metal oxide content of said matrix containing said cerium oxide particles, said coated article being essentially craze free and essentially optically clear at 1000°
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Accused Products
Abstract
An ultraviolet radiation absorbing coating comprising cerium oxide in an inorganic oxide matrix formed by the hydrolysis and condensation of alkoxysilane and/or other metal alkoxide or oxide which has a higher absorbance per unit thickness of coating by virtue of its much higher concentration of colloidal particles in said matrix and a reduced tendency to craze when exposed to temperatures in excess of 1000° C. and/or temperature cycling between ambient temperature and 1000° C. by virtue of heating a coated article at elevated temperature between 500° C. and 1100° C. before cooling the coated article.
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Citations
10 Claims
- 1. A coated article comprising a substrate of glass or quartz and a coating having an absorbance of 1 to 3 per micron of thickness at 320 nanometers and consisting essentially of colloidal particles of cerium oxide in a silica-based matrix and having a minimum concentration on the order of 40 weight percent of cerium oxide based on the total metal oxide content of said matrix containing said cerium oxide particles, said coated article being essentially craze free and essentially optically clear at 1000°
Specification