Low-temperature-sintered giant-dielectric ceramic capacitor dielectric and preparation method thereof

Abstract

The invention relates to the technical field of inorganic nonmetallic materials, in particular to low-temperature-sintered giant-dielectric ceramic capacitor dielectric with the low capacitor temperature change rate.The low-temperature-sintered giant-dielectric ceramic capacitor dielectric is prepared from 88 wt%-96 wt% of CaCu3Ti4O12, 0.01 wt%-7.0 wt% of (Ba0.65Sr0.35)TiO3, 0.01 wt%-6 wt% of Bi2WO6, 0.01 wt%-0.6 wt% of Nd2O3, 0.1 wt%-4 wt% of SiO2-Li2O-B2O3 glass powder (ZLB), 0.01 wt%-0.5 wt% of BiMnO3 and 0.5 wt%-4 wt% of (Li(1 / 2)Bi(1 / 2))TiO3.The lead-free cadmium-free giant-dielectric ceramic capacitor dielectric with the low capacitor temperature change rate is prepared by adopting the ordinary chemical raw materials of capacitor ceramic, and the sintering temperature of the capacitor ceramic can be greatly lowered.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to a ceramic capacitor medium with low-temperature sintering, high dielectric strength and small capacitance temperature change rate. It uses common chemical raw materials for capacitor ceramics to prepare lead-free, cadmium-free giant dielectrics and ceramic capacitor dielectrics with a small capacitance temperature change rate, and can also greatly reduce the sintering temperature of capacitor ceramics. This medium is suitable for the preparation of monolithic ceramic capacitors. The cost of the ceramic capacitor is greatly reduced. The dielectric constant of the medium is extremely high, and the miniaturization of the ceramic capacitor is easy to realize. At the same time, the withstand voltage can be increased to expand the application range of the ceramic capacitor, and the environment is not polluted during the preparation and use. Background technique ...

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Problems solved by technology

Specifically, these attempts either did not achieve the purpose of reducing the dielectric loss to a sufficient extent, or obviously damaged the original high dielectric constant characteristics of CCTO ceramics, resulting in a very low dielectric constant after modification, or destroyed the original low dielectric constant of CCTO ceramics. The advantage that the dielectric constant of the frequency band basically does not change with the frequency

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