SU952787A1 - Blue glass for optical filters - Google Patents

Description

This invention relates to silicate glass compositions, which is intended for the manufacture of blue ground-based signal light filters.

It is known-glass for blue light rays that transmit light with a wavelength of L 485 nm, containing, wt.%: SiOo 52.2-72.5: N3.0 0-16; KO 0-16; fNa, iO - 12); CaO 6.413, 7; AsjO, 0-1; 0-1; TiO, 0-2; CuO 5-9.5; C0j, 0 0.015-0.2 {.l.

However, these glasses contain a significant amount of alkaline oxides NajO and KgO, which indicates their low heat resistance,.

Closest to the invention to the technical essence and the achieved result is glass} containing. wt.%: SiOj 76; 1.5; 4.0; CaO 7/5; MgO 5.0; NaoO 7.0; KjO 6.0; PbO (in excess of 100%, the dyes CBS 0.1 and CuO 0.3 are added).

. Known glass has the following characteristics; total light transmission is 0.5-2.5%, the limiting color tone or the dominant wavelength is 460-485 nm, the color purity P is at least 30% - 2.

However, the known glass has a low value of C, which limits the possibilities of using products from it under conditions of increased requirements to the visibility range of aeronautical lights. In addition, the known glass contains a large amount of alkali, as a result of which it has a low - about 10 heat resistance.

The aim of the invention is to improve the lighting characteristics and increase the heat resistance.

15

This goal is achieved by the fact that blue glass for light filters, including SiO, KjO, BjO, MgO, CuO, CoO, additionally contains SrO, BaO and ZrO2 at the following ratio of components, wt.%:

SiO 74-80

NaaO2-5

CoO 1-3

1-3

MgO, 1-3

25

CuO0,29-0,72

CoO0.08-0.11

SrO0,6-3

BaO3,2-7

thirty

ZrO4-8 In order to intensify the process of glass melting, the boiling accelerators NaC and in the amount of 1-3 and 2-5%, respectively, are additionally added in excess of 100%. The resulting blue glass for filter light meets the requirements and has the following characteristics: thermal resistance not less, total light transmission not less than 4%, saturation not less than 30%, dominant for waves in the interval 460-480 nm, and moreover, The chromaticity coordinates, k; | Torye lie within, bounded by the corner points (source A): x 6.090; Xj, 0.143; x 2 0.180; X 0.220; y 0.030; x 0.177; Y4 0.220. To increase the heat resistance compared with the known glass, the content of alkali oxides in the glass has been reduced, and the zirconium-ZrO axis has also been introduced. In order to obtain given color characteristics and increase the technological character of the processes of cooking and making glass, SrO and BaO oxides are additionally introduced into it. Specific compositions of blue glasses are shown in the table. Glasses are cooked in an oven heated by natural gas at 1540–20 ° C in 175 l pots. The cooking is carried out under oxidizing conditions, for which KgO is introduced into the mixture through potassium nitrate KNO. The oxidizing conditions are necessary to obtain the largest possible amount of copper in the form of CuO (it is also formed during glass melting), because it is in this valence state that it performs its function — it cuts off the red part of the spectrum, which increases the color purity. But the chemical resistance offered by the glass belongs to the first hydrolytic class. Thus, in comparison with the known glass, the obtained glass has a higher light transmission at given chromaticity coordinates, which increases the visibility range of the signal of aeronautical lights that,. in turn, improves flight safety. In addition, the proposed glass has a bolre high temperature resistance. This increases the life of the filters from the proposed glass, which leads to a decrease in annual production, as well as lower costs for repair and installation work associated with the replacement of outdated filters.

Claims (4)

Claim Blue glass for filters, including SiO ?; Na ₂ O, K ₂ 0, V _g 0 _for MgO, CuO, CoO, characterized in that, in order to improve lighting performance and increase heat resistance, it additionally contains SrO, BaO and ZrO ₂ in the following ratio of components, weight. %: S1O2 Na ₂ 0 To _? 0 74-80 2-5 1-3 VNIIIPI Order 6195/34 1-3 1-3 0.29-0.72 0.08-0.11 0.6-3 3.2-7 4-8.