GLASS OR QUARTZ ARTICLE WITH CERIA- CONTAINING HIGH TEMPERATURE UV ABSORPTIVE COATING

摘要

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 DEG C and/or temperature cycling between ambient temperature and 1000 DEG C, by virtue of heating a coated article at elevated temperature between 500 DEG C and 1100 DEG C before cooling the coated article, is disclosed. Glass or quartz substrates coated with sol-gel coatings containing a high concentration of colloidal cerium oxide particles in a silica-based matrix are particularly high in absorption of ultraviolet radiation in the shorter wavelength range of 200 to 320 nanometers.