SU1283228A1 - Glass - Google Patents

Abstract

The invention relates to glass compositions used as insulating coatings for capacitive sensors, and can be used in electronics, technology of electrovacuum materials. The invention makes it possible to reduce the chemical aggressiveness of glass to silver, to eliminate redox effects at the metal-glass interface and the evolution of the gas phase from glass during coating, and to increase the upper temperature limit of the glass in the sensor. According to the invention, glass contains the following components, wt%: PbO 14-20, SiOj - 4-7, BjO, 50-56, BaO. 6-10, ACO, 2-4, LijO. 3-5, Na, 0 - 5-8, MgO 2-4. The upper limit of the service life of glass in the sensor is 180-190 ° C, the dielectric constant is 5.8-6.6. 2 tab. W

Description

The invention relates to glass compositions used as insulating coatings for capacitive-type sensors, can be used in electronics, technology of electrovacuum materials and other devices of the technology.

The aim of the invention is to reduce the chemical aggressiveness of glass to silver, to eliminate redox effects at the metal-glass interface and to separate the gas phase from glass during coating, and to increase the upper temperature limit of the glass in the sensor.

To obtain glass, a mixture was prepared from anhydrous silicic acid (chd), boric acid (chd), soda (chd), lead carbonate (chd), barium carbonate (chd), lithium carbonate (chd), magnesium carbonate (ch) and oxide aluminum (hch)

The mixture was thoroughly mixed in a drum mixer for 2 hours, then melted in a corundum crucible for one hour. This was followed by casting the melt onto a metal plate, annealing at 500-520 ° C for 15 minutes, cooling the glass together with the furnace and determining its properties using standard techniques. The formation of an insulating coating of synthesized glass on a capacitive type sensor was carried out as follows. First, a rectangular polycic plate was applied with a thin layer of silver paste, after which the paste was burned at 840 ° C for 20 minutes. On the silver layer, then a broken line was mechanically cut, which divided the silver layer into two combs, which are electrodes of a capacitive type sensor. The resulting glass was ground in an agate mortar in

the powder before passing through the 0063 sieve, then water was added to the powder to form a thick slurry. The slip was then applied with a brush with an even layer on the surface of the polycore and silver. The resulting billet was dried at 120 ° C, then placed in a muffle furnace, heated in it to 300-400 ° C for 40 minutes, after which it was quickly transferred to a sieve furnace heated to 800 ° C, and kept in it for 20 minutes. The sensor was transferred to a muffle furnace heated to 500 ° C and heated in it for 15–20 minutes, after which it was cooled together with the furnace.

Table 1 shows the specific formulations of the glasses described.

Table 1

Components

Composition No.

25

one

G.

-2

five

0

PYo

SiO,

B, 0

WAO

A1.0z

Lijo

MgO

14 5.5

53

ten

four

4 6.5

3

17

four

56

eight

2

3

eight

2

20

7

50

6

3,

five.

five

four

45

The properties of glass and coatings based on it are given in Table 2. (pp.5-6).

Table 2

Dissolving silver by glass and forming conductive bridges between sensor electrodes

Not observed

there is

Oxidative-No-No Becoming Effects on the Glass-Electrode Interface

Upper limit

glass service in

sensor, ° C 190 180 180

Crack crack resistance

No cracks

5.8 6.6 6.1

No no no

Sensors with a smooth transparent coating were then used to emit drying processes of varnishes and resins to study structural transformations in them when heated to 200 ° C,

Previously, sensors without a layer of glass were used for these circuits, and they were disposable. Using the developed glassy coatings, the possibility of multiple use of sensors with their sensitivity and small scatter of calibration characteristics was created. It was possible to rinse sensors without any difficulties in various organic solvents in order to remove residual lacquers and resins from previous experiments, in order to apply a different type of varnish, resin,

Thus, the developed glass made it possible to obtain sensors of capacitive type of reusable use, which increases their turnover during scientific research, and, consequently, reduces the costs of labor and materials for their manufacture. The stability of the sensors has increased and increased.

VNIIPI Order 7365/21

Random polygons pr-tie, Uzhgorod, st. Project, 4

Not

there is

110

No cracks

13.4

there is

35

40

thirty

45

an opportunity to increase the upper temperature ceiling of studies of structural transformations in varnishes and resins up to 180-190 ° С.

Claims (1)

Invention Formula Glass, including PbO, SiO, BjO, BaO and AljO, characterized in that, with a chain of reducing the chemical aggressiveness of glass to silver, eliminating redox effects at the metal-glass interface and the evolution of the gas phase from glass during coating and increasing. the upper temperature limit of the glass service in the sensor, it additionally contains LijO, NajO.H MgO in the following ratio of components, wt%: 14-20 4-7 50-56 6-10 2-4 3-5 5-8 2-4 Circulation 428 Subscription