GLASSCERAMIC OPTICAL MATERIAL WITH ABRUPT ABSORPTION EDGE IN UV-SPECTRUM AND METHOD OF PRODUCING SAID MATERIAL Russian patent published in 2012 - IPC C03C3/23 

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 1300-1400°C 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 400°C to room temperature in a furnace. Crystallisation takes place at temperature ranging from 380 to 450°C 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