Low-loss high-voltage ceramic capacitor dielectric

A capacitor dielectric and high-voltage ceramic technology, applied in the direction of fixed capacitor dielectric, fixed capacitor components, etc., can solve the problems of small dielectric constant, withstand voltage difference, and high dielectric loss, achieve small capacitance temperature change rate, and expand the scope of application , the effect of good performance stability

Inactive Publication Date: 2011-06-22
汕头高新区松田实业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As another example, the Chinese journal "Journal of Nanjing University of Chemical Technology" in 1999 No. 4 in "SrTiO 3 Composition and performance of high-voltage ceramic capacitor materials based on "a low-loss high-voltage capacitor ceramic medium is disclosed in the article, but the medium contains about 18 mol% lead titanate, which will be harmful to the environment and human body during preparation and use. Pollution
Another example is the Chinese Invention Patent Application Publication Note CN1212443A (the name of the invention is "high dielectric high performance medium temperature sintered chip type multilayer ceramic capacitor ceramic material", the patent application number is 97117286.2), although the disclosed ceramic capacitor ceramic material has a dielectric constant High (dielectric constant ≥ 16000), but poor withstand voltage (withstand voltage 700V/mm), and its components contain a certain amount of lead
Also have, Chinese invention patent application public specification CN1212444A (invention name is " high-performance mid-temperature sintered chip type multilayer ceramic dielectric capacitor ceramic material ", and the patent application number is 97117287.0), the disclosed capacitor ceramic material dielectric constant is too small (dielectric The electrical constant is 3000), the dielectric loss is high, and the withstand voltage is low (the withstand voltage is 860V/mm), and its components contain a certain amount of lead
[0004] Although the dielectric of some ceramic capacitors does

Method used

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Experimental program
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Embodiment 1

[0032] First, BaTiO was synthesized by a solid-phase method 3 , SrTiO 3 , BaZrO 3 , CaZrO 3 、 Bi 2 TiO 5 .

[0033] BaTiO 3 (Barium titanate) is prepared by the following process: equip BaCO with a molar ratio of 1:1 3 and TiO 2 , then for BaCO 3 and TiO 2 Grind and mix well, then BaCO 3 and TiO 2 The mixed material was put into an alumina crucible and kept at 1260°C for 120 minutes to obtain BaTiO 3 . BaTiO 3 Grind and pass through a 200-mesh sieve for later use.

[0034] SrTiO 3 (Strontium titanate) is prepared by the following process: equipped with SrCO at a molar ratio of 1:1 3 and TiO 2 , then for SrCO 3 and TiO 2 Grind and mix well, and then SrCO 3 and TiO 2 The mixed material was put into an alumina crucible and kept at 1260°C for 120 minutes to obtain SrTiO 3 . Obtained SrTiO 3 Grind and pass through a 200-mesh sieve for later use.

[0035] BaZrO 3 (Barium zirconate) is prepared by the following process: equip BaCO with a molar ratio of 1:1 ...

Embodiment 2-9

[0051]In Examples 2-9, the consumption of various raw materials is as shown in Table 1. The method for preparing a low-loss high-voltage ceramic capacitor dielectric using the above raw materials can refer to Example 1, and the temperature, time, pressure and other process conditions in each step can be adjusted according to actual conditions.

[0052] Table 2 shows the performance parameters of the dielectrics of the ceramic capacitors prepared in Examples 1-9 above.

[0053] The raw material ratio of table 1 each embodiment of the present invention

[0054]

[0055] The performance parameter of the low-loss high-voltage ceramic capacitor medium that table 2 each embodiment of the present invention makes

[0056]

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Abstract

The invention relates to a low-loss high-voltage ceramic capacitor dielectric which is characterized by comprising the following raw materials in percentage by weight: 58-91% of BaTiO3, 1-3% of SrTiO3, 4-20% of BaZrO3, 3-12% of CaZrO3, 0.03-1.0% of CeO2, 0.1-1.5% of ZnO and 0.5-4.5% of Bi2TiO5. The low-loss high-voltage ceramic capacitor dielectric provided by the invention has the advantages of high voltage resistance, low dielectric loss and no environment pollution in the preparation and use process, can lower the cost of the ceramic capacitor, and is suitable for preparing single-chip ceramic capacitors and multilayer chip ceramic capacitors.

Description

technical field [0001] The present invention relates to capacitor dielectrics, in particular to a low-loss high-voltage ceramic capacitor dielectric. Background technique [0002] Ceramic capacitors with high performance (such as high breakdown voltage, good temperature stability, high reliability, miniaturization, and large capacity) are urgently needed in the fields of color TV, computer, communication, aerospace, missile, and navigation. In order to obtain high-performance ceramic capacitors, the dielectric of ceramic capacitors is required to have the characteristics of low loss and high withstand voltage; at the same time, as people pay more and more attention to health and environmental protection, the dielectric of ceramic capacitors is required to be in the process of preparation, use and disposal. It will not cause harm to the human body and the environment, so the dielectric of ceramic capacitors is required to contain no metal elements such as lead and cadmium. ...

Claims

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Application Information

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IPC IPC(8): C04B35/49H01G4/12
Inventor 李言黄瑞南林榕
Owner 汕头高新区松田实业有限公司
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