Glass or quartz articles having high temperature resistant, UV absorbing coatings containing ceria.

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.