High-voltage low-loss ceramic capacitor dielectric and preparation method thereof

Abstract

The invention relates to a high-voltage low-loss ceramic capacitor dielectric, which is characterized by being prepared from the following raw materials in percentage by weight: 35 to 7 percent of BaZrO, 0.5 to 0.7 percent of CeO2, 0.8 to 1.2 percent of ZnO, 0.3 to 0.5 percent of MnCO3, 1.5 to 2.5 percent of La2O3, 0.8 to 1.2 percent of W2O3 and the balance of BaTiO3. The invention also provides a preparation method of the high-voltage low-loss ceramic capacitor medium. Compared with the prior art, the ceramic capacitor dielectric has the following advantages that the dielectric constant of the ceramic capacitor dielectric is high (the dielectric constant is more than 3400), the withstand voltage is high (the direct-current withstand voltage can reach more than 7kV / mm, and the alternating-current withstand voltage can reach more than 5kV / mm), and the dielectric loss is small (the dielectric loss is less than 0.8%). The ceramic capacitor dielectric disclosed by the invention is suitable for manufacturing a ceramic capacitor meeting the Y5P characteristic requirement. Moreover, the ceramic capacitor dielectric does not contain bismuth, lead and cadmium, and has no pollution to the environment in the 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-voltage and low-loss ceramic capacitor medium and a preparation method of the high-voltage and low-loss ceramic capacitor medium. Background technique [0002] Color TV, computer, communication, aerospace, missile, navigation and other fields urgently need ceramic capacitors with high breakdown voltage, stable temperature characteristics, high reliability, miniaturization and large capacity. At present, the medium used to produce high-voltage ceramic capacitors usually contains a certain amount of bismuth, lead and cadmium, which will cause harm to the human body and the environment and are gradually eliminated. Although some ceramic capacitor dielectrics are bismuth-free, lead-free, and cadmium-free dielectric materials, they have small dielectric constant, high dielectric loss, and low withstand voltage, which are not conducive to the miniaturiza...

AI Technical Summary

Problems solved by technology

At present, the medium used to produce high-voltage ceramic capacitors usually contains a certain amount of bismuth, lead, and cadmium, which will cause harm to the human body and the environment, and are gradually eliminated

Although some ceramic capacitor dielectrics are bismuth-free, lead-free, and cadmium-free dielectric materials, they have small dielectric constants, high dielectric losses, and low withstand voltages, which are not conducive to the miniaturization of ceramic capacitors, and their pressure resistance is poor, which is also not conducive to expansion. Application range of ceramic capacitors and improvement of safety

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