SU832608A1 - Ceramic material - Google Patents

Description

. (54) CERAMIC MATERIAL

one

The invention relates to radio engineering and can be used in the manufacture of high-frequency thermostable ceramic capacitors with an increased specific capacity for the TKE M75 group.

A ceramic material is known for the manufacture of various types of high-frequency capacitors in the TK M75 group based on solid solution (Ca, Za) (Ti, Al) Oz, with the addition of 2.5% Hours-Yarskaya or Veselovskaya clay 1.

Its disadvantage is that the value of the dielectric constant does not exceed 48.

The closest to the proposed technical essence is a ceramic material, mainly for thermostable capacitors, containing a mixture of barium, neodymium, bismuth and titanium oxides 2.

The disadvantage of it is not high enough dielectric permeability 69 at TCA -66 JOS degrees.

The purpose of the invention is to increase the dielectric constant.

The goal is achieved by the fact that the ceramic material, mainly for thermostable capacitors containing a mixture of barium, neodymium, bismuth and titanium oxides, additionally contains lanthanum oxide in the following proportion of components, wt. ° / o:

Barium oxide 19.7-20.7

Neodymium oxide25.1-32.0

Bismuth oxide6,2-6,7

Titanium dioxide38.0-39.5

Oksantantana2.1 - 10.0

Claims (2)

Example 1 (at minimum). To obtain 1 kg of material containing, weight. / o: BAO 19.7; 2.1; 32.0; 6.7; TiOjj 39.5; proceed as follows: 4.15 l of 2.05 mol of ammonium carbonate solution and 2.56 l of 13.4 mol of ammonia solution are placed into a glass equipped with a mechanical stirrer and, while the mixer is running, pour in a dropping funnel, a mixture of titanium chloride salts, barium, lanthanum, neodymium, bismuth with a speed of 20 l / h. A mixture of chloride salts is prepared, discharging 2.24 l of 2.19 mol of a solution of titanium tetrachloride, 2 l of distilled water, 1.29 l of 1.035 mol of a solution of barium chloride, 0.12 l of 1.024 mol of a solution of lanthanum chloride, 1; 85 l of 1.024 mol a solution of neodymium chloride and 0.24 l of 1.084 mol of a solution of bismuth chloride. At the end of the precipitation, the pH of the suspension should be 8-8.5. In addition, no titanium, barium, neodymium and bismuth ions are detected in the solution. The precipitate is separated from the solution on the suction filter, washed with chlorine ions with distilled water, and calcined in an electric chamber furnace at 1100 ° C for 8 hours. The resulting product is milled to a specific surface area of 7000–8000 cm. This composition has a dielectric strength of 94 67-.106 degrees-, tgJ (2-3) at t 155 ° C 102 CM-CM. Example2 (to the maximum). In order to get 1 kg of material, it contains, weight. ° / o: BaO 20.7; 10.0; 25, l; ft 6.2; TiO 38.0; The procedure is as follows: Example 1. The mixture of chloride salts is prepared as follows: 1.92 liters of 2.47 mol of titanium tetrachloride solution are added with 2 liters of distilled water, 1.28 liters of 1.042 mol of barium chloride solution, 0.68 liters of 0.996 mol of lanthanum chloride solution. , 1.45 l of 0.966 mol of neodymium chloride solution and 0.24 l of 1.084 mol of bismuth chloride solution. This composition has a dielectric constant of 97 at TKE 84. x 10-6 degrees -1, tg / (2 + 3) -10 J at t 155 01012 cm-cm. Example 3. (by mean value). To obtain 1 kg of material containing w./o: BaO 20.2; 5.0; 29.6; 6.45; TiOg38.75; The procedure is as follows: Example 1. The mixture of chloride salts is prepared as follows: 2 l of distilled water, 1.35 and 0.984 mol of barium chloride solution, 0.28 l of 1.040 mol of lanthanum chloride are poured into 2.32 l of 2.08 mol of titanium tetrachloride solution , 1.66 l 1.040 mol of a solution of neodymium chloride and 0.24 l of 1.084 mol of a solution of bismuth chloride. This composition has a dielectric constant of 95 when TKE-72d tg (2-3) -. 10-, at t 155 ° C 102 cm-cm. From the material obtained, capacitor blanks can be made using any method adopted in ceramic technology. The blanks are fired in the temperature range of 1280-1380 ° C. As can be seen from the above data, the dielectric constant of a given ceramic1: a material is 2 times higher than an industrial material and 28.2% higher than a known material. Production of ceramic material by the method of co-deposition provides a small tgjD (2-3) -l (J A higher dielectric constant value of the proposed material with TKE-7510 allows to obtain capacitors in the TKE M75 group with a higher specific capacity, leads to a decrease in material consumption and precious metals on 1000 pcs of capacitors in 2 times compared with the materials for this group of TKE used in industry. Claims Ceramic material, mainly for thermostable capacitors, containing a mixture of acid barium, neodymium, bismuth and titanium, characterized in that, in order to increase the dielectric constant, it additionally contains lanthanum oxide in the following proportion of components, wt.%: Barium oxide 19.7-20.7 Neodymium oxide 25.1- 32.0 Bismuth oxide6.2-6.7 Titanium dioxide38.0-39.5 Oxidel-tanane2.1 -10.0 Sources of information taken into account during the examination 1. Glass and Ceramics, No. 9, 1967. 2. US patent number 3775142, cl. 106-73.31 01.27.71 (prototype).