SU688480A1 - Ceramic capacitor material - Google Patents

Description

The invention relates to dielectric materials based on oxides of barium, titanium, calcium, zirconium, tin, with the addition of various oxides used to make ceramic capacitors.

A ceramic material based on oxides of barium, calcium, titanium, zirconium, tin, with additions of bismuth oxides and oxides of rare-earth metals, having dielectric constant values (e) from 1500 to 8500, is known (tg b) 0.01-0.02 and the temperature of spekant 1360-: 1430 ° 1.

Closest to the proposed material, which contains components in the following quantities, weight. %:

2.8-3.1 30.3-30.4 0.6-1.3 6.5-7.5 0.2-0.5 0.1-0.3 0.3-1.0 0 2-0.3 0.1-0.3 Else

2

The temperature from 5 to 85 ° С does not exceed 15-10%. Tangent from the angle of diesel losses tg and not more than 0.01. Firing temperature; published material 1360-1430 ° C.

The known material was developed for low-voltage capacitors, HNiccT high value of the dielectric loss tangent, which makes it difficult to use for the manufacture of high-voltage capacitors. The firing temperature of products i3 of such material is higher than 1360 ° С, which excludes the possibility of firing billets of high-voltage disk-type capacitors with a diameter of 60-75

and a thickness of 10-12 mm

f

electric furnaces with silicon heaters.

The purpose of the invention is to reduce the dielectric loss tangent and sintering temperature.

This is achieved by the fact that the proposed ceramic capacitor material, which includes BaO, CaO, TiOo ZrO2, SnO 3 3 3 3 3 3 3 3 3 3 3 3 3 B 3 B 3 3 2 3 3, 3, 2 M 3 or MgO additionally contains SrO, with the following ratio of components, wt. %:

0.5-1.2 5.8-6.8 5.8-6.8 0.1-0.3 1.8-2.4 0.3-0.9

or MgO 0.2-0.3 3.9-0.9 O steel

The preparation of the material is carried out as follows. The mixtures are prepared from the cakes of the two compositions by mixing and grinding the oxides taken in the indicated ratios x.

The mixture of composition I, wt. %

Table 1

table 2