SU747413A3 - Coating producing method - Google Patents

Description

one

This invention relates to a method for producing a coating on a laser glass.

A method of producing a coating is known by coating a substrate with a mixture of powders of two glasses with different melting points, followed by heat treatment l. The difference between the melting points of the glass being mixed is about. The coating formed is a uniform transparent glass that does not provide even the formation of a durable coating on a laser glass that absorbs infrared rays.

The purpose of the invention is to obtain a coating with high adhesion strength, which increases the ability of laser glass to absorb infrared rays.

This goal is achieved by applying a mixture of powders of two glasses with different melting points to the substrate, followed by heat treatment, the difference between the melting points being at least 230 ° C.

When mixing glass with a low melting point, for example, glass in the B20j-TE O-ZnO system with a glass powder, possesses

By high melting point and low linear expansion coefficient and applying this mixture on glass at t 400-600 ° C, glass particles with low CTE are dispersed in the molten mass of glass with low melting t, CTE coating is reduced to a value equal to CTE of laser glass (105- lOVc) that

10 contributes to improved bond strength. The size of the powder particles should not exceed 100 microns. A mixture. Prepared from 50-98% by weight of glass with low melting t and 2-50% by weight of glass with higher melting temperature t and low CTE. Mixed glass may contain components that increase the absorption of IR rays (, FejOj, etc.). The following examples are given, to illustrate the invention (the content of components in glass is given by weight,%):

Example 1. Prepare a powdered mixture of particles

up to 10 microns in size glass with a melting t of 3550s L-115. composition (A) PJ-OS 40.4; PBO 36.7; Hell; s, 0 13.2; 9.7 and glass composition (B) 11.8; SiO 80.5, ABgOj 2;

30 NagO 4.4; 2; MqO 0.1; Cao

0.3; . 0.7 and having t melting and (X 32-10 / ° C., The mixture is applied to a laser glass with CLTE 10510 VC using an organic solvent, for example, a mixture of amyl acetate and nitrocellulose or acetone and heat-treated at t = 460-480С. After

This coated laser glass is exposed from 1 to 10 times with a xenon flash lamp, with a power of about bJ, set at a distance of 3 cm from the laser glass.

The results of the experiment are given in table.1.

Table 1

100

95

ten

90

15

85 80

20

Example 2. Preparing a mixture consisting of 80% glass (A) containing PgOg 37.9; PbO 35.9;

AgjO 13.2; NajO 3.3 V, 0.- 9.7; Ag, 0

having a l 137 10, t W: AULES and 20% of glass B (from example 1).

Example 3. Prepare a mixture of powder with a particle size of up to 10 microns. The mixture contains glass (A) (from Example 1), glass (B) of composition SlOji 7b, 7 ,. 11.2; Ae5, Oz 1.9; N32 O 4.2; 0.2; MDO 0.1; CaO 0.3; AsgOj 0.7; 4.7; , SL 37, 3 10 / ° С or glass of composition (B2) SiOg 73.2; BgOs 10.7,

(AI) 80 20

(BUT;

80

20

80

20

80 20

8020

20

80

exfoliate completely

otelo-otslaiivaet-vaet

with half an hour

not from-not otslai-slavaetsa

AI.O. 1.8; Lado 4; MgO O, 2; CaO 0 ,, 0, t;: Fe O. 9.2; 0 37.7 or stack

the stack (B) of the CB composition) from Example 1; the percentage ratio of the mixture components in Example 3 is shown in Table 2. The mixture of glass powders in accordance with examples 2, 3 after preparation was applied to a laser glass with FLTR 105-using an organic solvent and heat treated at t 460-480 ° C. Test specimens are carried out in accordance with Example 1.

The test results are summarized in table 2.

Table #

no otela- otslai-peels off

partially fully - - does not peel off

/

The tests carried out showed that the image of 1Y, manufactured by the proposed method, has a high adhesion strength of the coating to the laser glass.

Claims (1)

1. USSR author's certificate O 435199, c. 03 C 7/06, 1972.