SU1721031A1 - Black uviol glass - Google Patents

Abstract

The invention relates to glass compositions used for the manufacture of fluorescent flaw detection lamps, as well as light filters. The purpose of the invention is to reduce the light transmission at wavelengths I 300 and 400 nm. Black uviol glass contains, wt%: SI02 60-70; BaOz 2-4; BaO 6-8; NaaO 10-14; K.20 0.9-6.3; N10 7-9; Sb203 0.5-1.5; Ce02 0.1-0.3; Rurse 0.1-0.3. The light transmission on I 300 is 1.3-1.5%, I is 400 3.2-4%. 1 tab.

Description

The invention relates to a glass composition that can be used to make lamp shells of fluorescent flaw detection, which is a source of ultraviolet radiation, as well as light filters that transmit ultraviolet rays in the long wavelength region of the spectrum.

Black UV glass is known that transmits ultraviolet rays, including, in wt.%: SI02 65-75; NaaO 12-15; K200-8; CaO8-13; MoD-5; CuO 1.5-3; N10 0.75-2; CaO 0.1-4.

When glass is being cooked under industrial conditions, it has a maximum transmittance at wavelengths of 325–425 nm in baths and absorbs visible radiation from 425. to 750 nm.

The disadvantages of this glass are low light transmission at a wavelength of 365 nm (19%) and high transmittance at a wavelength of 400 nm (7.3%).

Luminescent analysis is based on the property of materials to be illuminated by ultraviolet radiation. The part of the long-wave ultraviolet spectrum with a maximum at the wavelength of 365/366 nm is the area where the luminescence of the object under study is excited. Therefore, the glass filter should have a very high coefficient of light transmission in this part of the ultraviolet spectrum.

Closest to the proposed technical essence and the achieved result is a glass containing, in wt.%: SI02 62-67; BaO 1-4; CaO 3-6; N320 10-15; “20 6-9; S2020, 8-0.5; ZnO 3-7; N10 2-6; Soo 1-3; CeO2 0.05-0.3 With light transmittance at wavelengths I 300 nm 3%; I 320 nm 8%; I 365 nm 60%; I 400 nm 18%; nm 5%.

The disadvantages of this glass include the increased shortwave

GO

about

with

New ultraviolet transmission at 300 and 320 nm wavelengths, as well as in the visible region of the spectrum at 400 and 410 nm, short-wave ultraviolet rays are dangerous for human vision during operation of devices. For safety work, it is necessary that the black UV-glasses do not pass at all or pass the minimum amount of UV rays in the range of the spectrum of 300-320 nm.

When conducting a luminescent analysis, the phosphors should be irradiated only with ultraviolet flux, there should be no visible radiation, otherwise the luminescence is blocked by the visible radiation from the phosphor reflected from the phosphor and the desired effect of the luminescent analysis is not achieved. Therefore, at a wavelength of 400 nm, it is necessary to have a transmittance of no more than 4%.

The purpose of the invention is to reduce the light transmission at wavelengths I 300 and 400 nm.

The goal is achieved by the fact that glass including SI02, BaO, NaaO, 20, NiO, Ce02, 520z, additionally contains В20з, Рв20з in the following ratio of components, wt.%: SiCte 60-70; BaO 6-8; Na20 10-14; K20 0.9-6.3; N10 7-9; Ce02 0.1-0.3; ZaOz 0.5-1.5; B203 2-4; Fe2030.1-0.3.

Introduction (boron oxide) allows to increase the light transmission of glass at a wavelength of 365 nm in the maximum zone, contributes to better penetration and lightening of the glass mass, since B203 is a glass-forming oxide, which increases ultraviolet transmission and improves the working properties of glass.

Introduction of Rv20z and an increase in the NiO content in glass contributes to a decrease in the light transmission of glass in the visible region of the spectrum at wavelengths of 400–410 nm. Nickel and iron oxides give a steep break in the absorption curve in the ultraviolet region of the spectrum in the range of 370-400 nm. Other known technical solutions with similar features are absent.

The compositions of the glasses, as well as their physico-chemical properties are shown in the table.

Black uviol glasses are heated in a gas-flame furnace and at a temperature of 1,450 ° C. Quartz sand, previously sifted and dried, is used to enter SI02. B203 is introduced via technical boric acid. Sodium and potassium oxides are introduced through technical carbonate salts. For the input of Ce02, N10, 520z, Rv20z, use

Chemical reagents of the grades hch, h, chd, BaO, are introduced through the chemical reagent Vasoz of the grades h, hch. .Processing materials, cooking

the charge, loading it into the furnace is carried out on the known equipment. Forming flasks manual.

Graphic representation of the light transmission of known and proposed glasses

shows a significant superiority of the latter in terms of reducing light transmission at wavelengths of 300-400 nm.

In the zone of maximum ultraviolet transmission, an increase in light transmission

glass for every 1-2% is difficult to achieve due to the instability of the internal structure of glass containing nickel oxide. Nickel in glass is in a bound state in the form of complex

complexes of violet and yellow colors that are in moving equilibrium. The purple nickel complex gives an increase in the transmittance of glass to I at 365 nm. When the balance is shifted towards the yellow

The complex glass transmission decreases in the maximum zone. The slightest changes in the composition of borosilicate glass, a decrease in the content of nickel oxide in glass below 70% leads to a shift of the rolling

equilibrium towards the formation of a yellow complex and, accordingly, to a decrease in the light transmission of glass at a wavelength of 365 nm, which, in turn, leads to a decrease in the UV flux of lamps below

valid values.

The proposed glass belongs to the platinum group of electrovacuum glasses, and is similar in physical parameters (TCLE, heat resistance, softening temperature) to known glasses. The proposed glass has the best spectral characteristics while maintaining the existing values of the remaining parameters,

Thus, the proposed composition

black UV glass has a lower light transmission at wavelengths I 300 and 400 nm compared with the known glasses,

Claims (1)

Invention Formula Black UV glass including SI02. BaO, Na20, K20, NiO, Ce02. 5,0203, about the fact that, in order to reduce the light transmission at wavelengths I 300 and 400 nm, it additionally contains B203, Rv20z in the following ratio of components, wt.%: SI02 60-70; BaO 6-8; Na20 10-14; K20 0.9-6-3; NiO 7-9; Ce02 0.1-0.3; S2 Oz 0.5-1.5; B203 2-4; Re203 0.1-0.3.