SU975620A1 - Low melting glass - Google Patents

Description

(54) FLAMMABLE GLASS

This invention relates to glass compositions that can be used in the electrical industry and in radio engineering.

Known vitreous coating containing the following components, may. %:

25.8-38.6

S iO 9.0-18,5

BiOj 7.0-8.5

ACO

12.7-13.6

RjO 2,6-10,0

PjOs 0,2-0,4

MgO 9.0-12.8

CaO 2.2-9.5

BaO 0.4-0.8

0.9-2.8

Tioo

The specified glass has a specific volumetric electrical resistance of p 8x10 - 1x10 1 OMM and electrical strength of E 10 - 12 MV / m.

The closest in technical essence and the achieved result to the invention is glass, containing the following components, wt.%:

SiO, 10-30

BjOj5-28

Al Oj10-25

MoO0,5-2

0.5-4

ZnO 0.5-18 PbO 10-25 NajO 0.5-10 K jO 1-15 L ijO

5-7

The known glass composition has a specific volumetric electrical supply RU 6,6x10 - 9, 2х102 Ω m

10 and electric strength is 5–12 MW / m 2.

Glass is characterized by low chemical resistance. When kept in cold water, the loss in weight of glass samples is up to 1.5%.

The low electrically insulating properties and the low chemical resistance of the glass make it impossible to use it for the preparation of a composite electrically insulating material.

The purpose of the invention is to increase the specific volumetric resistivity and electrical strength of glass and increase the chemical resistance of glass.

This goal is achieved by

that glass, including Si0,,

30 A, N350, KjO and PjOs, contains

The specified components in the following quantities, May. %:

SI0219-25

BcfOj29-35

AljOj15-19

Na / jO5,6-6,4

8.4-9.6 05

11-18

The required property is achieved by the optimum ratio of three glass-forming oxides SiOs B / iOj, forming a strong, structural framework.

Specific compositions of the glasses are given in table.1.

Physico-chemical properties of glasses are given in table 2.

For the synthesis of glasses, silica sand, boric acid, alumina, soda, potash, aluminum metaphosphate are used.

Glass melting is carried out in gas furnaces in quartz crucibles. Cooking temperature 1250-1300 ° С. The finished glass mass is cast into water to form a granulate. The dried granules are ground in a ball mill.

The specific volume resistivity is determined on samples of glass with a size of 050 mm for the electrical content of the components, in% by weight, in the composition

19 29

20

23

35

33

18 6.4

17 5.6

19 6 9 8.4 9.6

13

eleven

18

a rometer of the ITN-7 brand with the PS-1 prefix,

Chemical resistance to water is determined in accordance with GOST 10134-62 by boiling a portion of glass powder in distilled water for 3 hours.

The CTE and T are determined on glass samples 4x4x50 mm in size on a DKV-1 instrument in accordance with GOST 1097869.

Introduction of glass through AlPQ refractory aluminum phosphate instead of conventional ammonium phosphate monosubstituted decomposing at a low temperature (about 900 ° C) reduces atmospheric pollution during the cooking process and improves the working conditions of working 11D1x.

Glass contains neither toxic components, such as PbO, or scarce oxides (2pO, Li 20), which allows to reduce the cost of glass, as well as to reduce the pollution of the atmosphere.

Glass can be used in the manufacture of mica-insulating material of high heat resistance, obtained from waste mica and glass, as a binder by the method of high-temperature pressing.

Table 1

14

ten

5 30 15

thirty

28

ten

five

20

25 16

ten

ten

25 6 9 15

9

10 0.5

0.5

7

3

one

2 0.5

2

4 10 0.5

18 1 0.5

4.5

15

table 2

Claims (1)

Formula of the invention Fusible glass, including S Ϊ o _a , B ₂ 0 y, A I 2 0 J, N a, K ₂ 0 and P ₂ 0 $ characterized in that, in order to increase the specific volume electrical resistivity, electric strength and chemical resistance , it contains these components in the following amounts, May. %: Sί0 _σ 19-25 Β _α 0 ₃ 29-35 VNIIIPI Order 8918/34 A 1 2 0 ₃ 15-19 Na ₂ 0 5.6-6.4 K ₂ 0 8.4-9.6 P ₂ 0b 11-18