SU1217851A1 - Ceramic material - Google Patents

Description

The invention relates primarily to electronic industry and radio engineering and can be used to manufacture products operating at temperatures up to 300 ° C as materials for trimming capacitors, bases for resistors, substrates, and other electronics products.

The purpose of the invention is to reduce the sintering temperature of the material and stabilize its dielectric characteristics.

The proposed ratio of the components of a ceramic material is distinguished by a relatively low sintering temperature (1480–1500 ° C) for a material of ESP based on magnesium oxide, uniform, dense, and evenly distributed to the periclase crystallization.

The introduction of a smaller amount of glass into the material does not allow a decrease in the sintering temperature of the material, and an increase in the addition of glass leads to a significant deterioration in all the dielectric characteristics throughout the entire temperature range.

The proposed ceramic material is obtained as follows.

Raw magnesium powders (MgO or MgSO3, etc.) are subjected to preliminary heat treatment at 1100-1300 C with vyderzhkoy at the final firing temperature for at least 2 hours after

MgO 99.0

Glass system SiOf -CaO-BjOj1,0

Sintering temperature, ° С1500 + 20

Opened porosity,%. About

Thermal linear expansion coefficient

fc in the temperature range of 20-100 C

blowing vibrating milling of raw powders to a basic particle size of 2-5 microns.

Glass CaO-Si02.-Bj03 systems are produced by conventional technology. All initial components are mixed 24 hours in a porcelain drum. The glass melting temperature is I350-1400 C, the temperature of the beginning of spreading, the temperature rise in the furnace is 5 (5 ° C per hour. The glass melting time is 2 h.

Next, the glass is granulated and ground to a basic particle size of less than 3 microns.

tS Components are mixed in a vibrating mill 1-3 h in the dry method. Wet mixing in ethyl, propyl, butyl or other alcohols is allowed.

20 Products are made by pressing. The sintering of the material is carried out in a wide range of temperatures. (100 ° C) starting from 1450 to 1500 ° C in electric furnaces with air medium. Sintered ceramic material is a uniform dense shard with uniformly distributed periclase, the grain size of which is 18-25 microns, but not more than

30 40 microns with thin layers of glass between them.

The compositions and characteristics of the obtained materials are given in the table.

96.0 93.0 4.0. 7.0 1 1500+ 20 О О

10-11

9-11

Compared with the prototype, the sintering temperature of the ceramic material is reduced by more than 150 ° C; a material based on oxide is obtained

Table continuation

25

magnesium with a dense uniform crystalline structure and high dielectric characteristics.

Claims (1)

CERAMIC MATERIAL, intended primarily for the manufacture of electronic products, containing MgO and glass, characterized in that, in order to reduce the sintering temperature of the material and stabilize its dielectric characteristics, it contains glass of the following composition, wt.%: S10 £ 44.4-45.6 CaO 15.4-15.9 in _r about ₃ 9.9-10.3 A1 _g 0 ₃ 2.7-2.9 MgO 0.4-0.6 CgO 8.4-8.8 Zno 7.4-7.7 Na ₄ 0 0.1-1.6 K _r 0 0.1-0.3 And _r 0 0.1-0.4 Zr0 ₂ 8.6-9.0 at the next tov, May.%: ratio of components MgO .93.0-99.0 ω Glass 1.0-7.0 from from m go