GLASSCERAMIC OPTICAL MATERIAL WITH ABRUPT ABSORPTION EDGE IN UV-SPECTRUM AND METHOD OF PRODUCING SAID MATERIAL

摘要

FIELD: chemistry. ^ SUBSTANCE: invention relates to compositions and techniques of producing glassceramic optical materials which can be used to make filters for protection from UV radiation. The material is obtained from glass of the following composition, mol %: K2O - 18-20; B2O3 - 35-45; Al2O3 - 18-22; NaCl - 4-6; P2O5 - 2-7; Cu2O - 1-5; NaF - 1-3; SnO2 - 0.2-0.6; Sb2O5 - 0.6-1. The charge mixture is molten at temperature 1300-1400C with uniform stirring of the molten charge mixture at a rate of 1-10 rps. Phosphorus oxide P2O5 must be present in the mixture in form of NH4H2PO4 in molar concentration of 2-13%. Further, the melt is inertially cooled from 400C to room temperature in a furnace. Crystallisation takes place at temperature ranging from 380 to 450C for 5-50 hours, followed by inertial cooling to room temperature. ^ EFFECT: eliminating the effect of photochromism of glassceramic optical materials with an abrupt optical absorption edge in the UV spectrum and simple technique of producing said materials. ^ 2 cl, 3 dwg