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Lead-free high-voltage capacitor dielectric ceramic sintered at medium temperature and preparation method thereof

A technology for high-voltage capacitors and dielectrics, applied in the field of medium-temperature sintered lead-free high-voltage capacitor dielectric ceramic materials and preparations, can solve the problems of low dielectric loss, high breakdown voltage, and large dielectric loss, and achieve high dielectric constant and high Insulation resistivity, effect of small particle size

Active Publication Date: 2017-05-10
元六鸿远(苏州)电子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally, barium titanate ceramics have the characteristics of high dielectric constant, large dielectric loss (1% to 2%) and low breakdown voltage (<100kV / cm) due to their ferroelectric structure. In addition, there is electrostriction. phenomenon, thus limiting its application in the field of high voltage capacitors
Another available high-voltage capacitor material is titanium dioxide, which has a high breakdown voltage (≈350kV / cm), low dielectric loss (≈0.05%) but low dielectric constant (≈110), so it is used as a high-voltage energy storage dielectric ceramic Its dielectric constant is low

Method used

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  • Lead-free high-voltage capacitor dielectric ceramic sintered at medium temperature and preparation method thereof
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  • Lead-free high-voltage capacitor dielectric ceramic sintered at medium temperature and preparation method thereof

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Embodiment Construction

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all the embodiment. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0042] The selected raw materials of the present invention can be purchased through commercial channels unless otherwise specified.

[0043] Strontium titanate (SrTiO 3) dielectric ceramics have a typical perovskite structure and have the advantages of high dielectric constant (≈250), low high-frequency loss, and good thermal stability. Because of its paraelectric structure at room temperature, it is not only different f...

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Abstract

The invention discloses lead-free high-voltage capacitor dielectric ceramic sintered at medium temperature and a preparation method thereof; the lead-free high-voltage capacitor dielectric ceramic is prepared from, by weight, 100 parts of Sr0.78Ca0.20Ba0.02TiO3, 8-20 parts of Bi2O3.2TiO2, 0.05-0.35 part of MnCO3, 0.05-0.30 part of Co2O3, 0.01-0.08 part of MgTiO3, 0-0.20 part of Al2O3, 0-0.10 PART OF Nb2O5, 0-0.08 part of HfO2, and 1-2 parts of a sintering aid, via the steps of ball milling, drying, grinding and screening. The dielectric constant and insulating resistance of the capacitor dielectric ceramic are adjusted mainly by changing the content of Bi2O3.2TiO2, comprehensive performance of the dielectric ceramic is improved by selecting different doping modifying elements, and the finally prepared dielectric ceramic has high dielectric constant, low loss, high insulating resistance and high breakdown strength. The dielectric ceramic is sintered at medium temperature and free of lead, is suitable for the preparation of high-voltage multilayer ceramic capacitors (MLCC), and has great practical value and market value.

Description

technical field [0001] The invention relates to the technical field of electronic information materials and components, in particular to a medium-temperature sintered lead-free high-voltage capacitor dielectric ceramic material and a preparation method. The cost of ceramic capacitors is suitable for the development of single-layer and multi-layer ceramic capacitors. Background technique [0002] High-voltage ceramic capacitors have the advantages of high breakdown voltage, large capacity, high stability, high energy storage, AC high frequency, etc., and have the function of blocking DC and separating various frequency components. It is one of the key components of high-voltage power supplies and high-voltage lines such as voltage doubling power circuits for machines and various testing instruments, AC circuit breakers, etc. It is widely used in power equipment for power transmission and distribution systems and equipment for processing pulse energy. [0003] With the advanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/634C04B35/64
CPCC04B35/4682C04B35/63416C04B35/64C04B2235/3206C04B2235/3208C04B2235/3213C04B2235/3217C04B2235/3232C04B2235/3244C04B2235/3251C04B2235/3262C04B2235/3275C04B2235/3284C04B2235/3298C04B2235/3409C04B2235/3418C04B2235/661C04B2235/94C04B2235/96
Inventor 程华容杜红炎杨魁勇宋蓓蓓孙淑英王金生
Owner 元六鸿远(苏州)电子科技有限公司
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