UV-sensitive material
AssigneeCorning Incorporated
InventorsNicholas F. Borrelli, Lauren K. Cornelius, Dennis W. Smith, Paul A. Tick
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Abstract
Materials, both glass and glass-ceramic, that exhibit UV-induced changes in light transmission and electrical conductivity behavior. The materials consist essentially, in mole %, of 20-40% SiO2, 10-20% AlO1.5, 35-55% SiO2+AlO1.5, at least 30% CdF2, 0-20% PbF2, and/or ZnF2, 0-15% rare earth metal fluoride, and 45-65% total metal fluorides.
Claims18
A material that undergoes a decrease in light transmission when exposed to UV-radiation in either the glass or glass-ceramic state, that is thermally bleachable after darkening, and that consists essentially of an alumino-silicate based glass containing CdF2.
A glass or glass-ceramic article which exhibits UV-induced, light transmission and electrical conductivity behavior, the article having a composition consisting essentially of silica, alumina, and cadmium fluoride.
A method of producing a glass article which exhibits UV-induced light transmission and electrical conductivity behavior which comprises formulating, mixing and melting a glass batch containing silica, alumina, cadmium fluorides, and lead, and/or zinc fluoride and limiting the PbF2 and/or ZnF2 content to less that 20 mole %, and forming an article from the glass.
Dependencies are inferred from the claim text.