High-temperature stabilization ceramic capacitor dielectric

Abstract

The invention relates to a high-temperature stabilization ceramic capacitor dielectric composition. A conventional ceramic capacitor dielectric preparation method is adopted, and general chemical raw materials of capacitor ceramics are utilized to prepare the high-temperature stabilization ceramic capacitor dielectric without lead, cadmium and toxicity. The ceramic capacitor dielectric composition is characterized by comprising the following components in weight percent: 55-90% of BaTiO3, 2-25% of SrTiO3, 2-15% of CaTiO3, 0.5-9% of MgNb2O5, 0.1-2.5% of Bi3NbTiO3, 0.1-0.8% of Gd2O3 and 0.03-1.0% of MnCO3, wherein the BaTiO3, the SrTiO3, the CaTiO3, the MgNb2O5 and the Bi3NbTiO3 are respectively synthesized from conventional chemical raw materials through a solid phase method. The dielectric is suitable for preparing a monolithic ceramic capacitor, the volume and voltage resistance of the ceramic capacitor can be reduced, the cost of the ceramic capacitor is greatly lowered, the safety is improved, and moreover, high temperature stability is obtained; and in addition, the dielectric does not pollute the environment in preparation and use processes.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to a high-temperature stable ceramic capacitor medium; it adopts a conventional preparation method for ceramic capacitor medium and utilizes common chemical raw materials of capacitor ceramics to prepare lead-free and cadmium-free high-temperature stable ceramics Capacitor medium can also reduce the sintering temperature of capacitor ceramics. This medium is suitable for the preparation of monolithic ceramic capacitors, which can greatly reduce the cost of ceramic capacitors. At the same time, it can improve temperature stability to expand the application range of ceramic capacitors. Does not pollute the environment. Background technique [0002] Color TV, computer, communication, aerospace, missile, navigation and other fields urgently need ceramic capacitors with high breakdown voltage, good temperature stability, high reliability, miniaturization and larg...

AI Technical Summary

Problems solved by technology

The disadvantage of this patent is that the preparation process is complicated, which leads to an increase in product manufacturing costs. The dielectric constant of the high-voltage capacitor ceramics manufactured according to its dielectric formula is 1800-7200, which is too small and not as high as the dielectric constant of this patent.

[0009] There is also a patent "a dielectric for ceramic capacitors and its preparation method" (patent application number: 201010538725.8). Although the dielectric constant of this patent is high, the temperature capacity characteristics are poor and do not meet the characteristics of X7R. The formula is different from this patent

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