JPS6020848B2 - Porcelain dielectric composition for temperature compensation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature-compensating porcelain compact composition that has a high dielectric constant, a small temperature coefficient, and a small loss angle.

An object of the present invention is to obtain a temperature-compensating porcelain dielectric composition that has a yield rate of 300 or more, a temperature coefficient of 250 PM/°C or less, and excellent sinterability.

Conventionally, MgTiQ has been used as a porcelain dielectric composition for temperature compensation.
, CaTiQ, SrTi03, Ti02, etc. have been used, but these have the disadvantage that when the temperature coefficient becomes small, the dielectric constant cannot be obtained and the loss angle deteriorates. In addition,
CaTj03 has a dielectric constant of 160 and a temperature coefficient of -1600PP.
M/°C, and SrTj03 has a dielectric constant of 360 and a temperature coefficient of -450 Cape PM'. It has the characteristics of ○, and to improve these, there is a method to reduce the temperature coefficient by adding Bi203 or Bi2Q and TI02 at the same time, but a composition that fully satisfies both dielectric constant and temperature characteristics has not been obtained. . The present invention eliminates such drawbacks, and the ship Ti03
Ba (Nal/4V3/4) for the basic composition 10 consisting of 40 to 88 hol%, the balance being CaTi03
A composition in which 1 to 10 parts by weight of 03 is added, and further SN02
, SiQ, MN02, Ti02, AI203, Bi20
3. It relates to a temperature compensating ceramic dielectric composition in which 0.1 to 3 parts by weight of one or more of Fe203, Cu◯, and Cdo are added in combination.

EXAMPLES Hereinafter, the present invention will be specifically described in detail by giving examples.

Example: Commercially available BaCQ, CaC08 and Ti02 were mixed in equimolar amounts, and BaCQ, Na2C03 and V205 were mixed at 8 molar ratios.
: 1:3, pre-calcined and finely pulverized 1100 to 125 pi0x bait to create BaTi03, CaTi03, and horse mackerel (Nal/4V3/4)03.

Next, these raw materials were mixed to have the component ratios shown in Table 1, wet mixed using a urethane-lined pot mill to evaporate water, and then an aqueous PVA (polyvinyl alcohol) solution was added as a binder and dried. A disc with a diameter of 10 mm and a thickness of 2 lines is press-formed at a pressure of 1 to 2 tons/ground, and competitive stripes are performed under predetermined scale stripe conditions. A Pd-Ag paste was applied to the obtained porcelain millet to obtain a completed product, and the electrical properties were measured, and the results shown in Table 2 were obtained. Table 1 Dielectric composition 2
The electrical characteristics in the Table Adjacent Conditions and Electrical Characteristics Examples are the measured values at a frequency of IKHz, the dielectric constant tan6 is the value at 20°C, and the temperature coefficient is the value where the change in dielectric constant due to temperature is constant. Since it is not a change in direction, the maximum value between -20 and 180 qo is shown.

In the table, sample No. Nos. 5 to 16 are examples using only the basic components BaTi03 and CaTiQ. Although No. 6 satisfies the target values, the mechanical strength is somewhat weak and there are difficulties in workability. Sample No. 22 to 65 have Ba (Na) as the basic component.
This is an example when adding l/4 V3/4)03,
No. From No. 22 and No. 24, if the amount added is less than 1 part by weight, the effect as an additive is not sufficiently exhibited. 63, 6
If the amount exceeds 5 to 10 parts by weight, the binding property will decrease and tan6 will worsen, so the amount added is limited to 1 to 10 parts by weight. Furthermore, sample no. Nos. 72 to 89 are examples in which an auxiliary oxide is added; 72 and 737 also have 0 addition amount compared to 85.
．． If it is less than 1 part by weight, the effect of the additive will not be sufficiently enhanced, and N
o. If the amount exceeds 3 parts by weight than 78, 79, and 84, the sinterability will deteriorate, and at the same time, the content will be more likely to react with the zirconia setter, so it is limited to 0.1 to 3 parts by weight. The above examples form part of the present invention, and samples produced by dry mixing in addition to wet mixing also exhibited similar problems. The porcelain dielectric composition according to the present invention has high mechanical strength and excellent polishability, so it is very easy to process. It supplies the most suitable materials for device dielectric materials.

Claims (1)

[Claims] 1. 40 to 85 mol of BaTiO_3 as the main component
%, the balance being CaTiO_3, 1 to 100 parts by weight of Ba(Na1/4V3/4)O_3.
A porcelain dielectric composition for temperature compensation, characterized in that 10 parts by weight of the composition is added. 2 40 to 85 mol% of BaTiO_3 as the main component,
1 to 10 parts of Ba(Na1/4V3/4)O_3 to 100 parts by weight of the basic composition, the balance of which is CaTiO_3.
Add parts by weight, and further add SnO_2, SiO_2, MnO_
2, TiO_2, Al_2O_3, Bi_2O_3, F
A porcelain dielectric composition for temperature compensation, characterized in that 0.1 to 3 parts by weight of one or a combination of two or more of e_2O_3, CuO, and CoO is added.