Method for reducing copper calcium titanate ceramic loss by air quenching

Abstract

The invention discloses a method for preparing copper calcium titanate ceramics with low-dielectric loss by air quenching based on a sol-gel method. The method includes the steps: firstly, taking copper nitrate, calcium nitrate and butyl titanate as raw materials, taking absolute ethyl alcohol as a solvent, and performing weighing and batching according to the stoichiometric ratio of chemical elements in a chemical expression CaCu3Ti4O12(CCTO) of copper calcium titanate; secondly, placing configured sol into a water bath kettle with the temperature of 80 DEG C, and continually stirring mixtureuntil forming of dried gel; thirdly, removing organic substances in a muffle furnace by the aid of an electric furnace and a muffle furnace to form CCTO ceramic precursor powder; fourthly, performinggel-filling, grinding, granulation and tableting to prepare ceramic blanks, placing the ceramic blanks into the muffle furnace, sintering the ceramic blanks, and keeping the temperature in the furnace; finally, taking out CCTO ceramic samples when the temperature in the furnace is reduced by 1000 DEG C or less after sintering, and performing quenching and cooling on the CCTO ceramic samples to reach indoor temperature in the air. The method is simple in operation process and low in sintering temperature, and the prepared ceramic samples are good in compactness and frequency stability and lowin dielectric loss.

Description

Technical field [0001] The invention belongs to the field of dielectric materials, and specifically relates to a low-loss calcium copper titanate (CaCu 3 Ti 4 O 12 , Referred to as CCTO) ceramic preparation method. Background technique [0002] With the continuous development of technology, many fields including the microelectronics industry and the new energy industry have set higher standards for the miniaturization and high performance of dielectric materials. Therefore, giant dielectric materials have become a hot spot in current research. The so-called giant dielectric material refers to ε r >10 3 The dielectric material is one of the important conditions for miniaturization and high integration of electronic devices. It has a very broad application prospect in the fields of high-density energy storage and microelectronic devices. [0003] CCTO ceramic material is one of the giant dielectric constant materials that has attracted the most attention in the past ten years. C...

AI Technical Summary

Problems solved by technology

[0006] Public literature "Song Jiang, CaCu 3 Ti 4 o 12 Research on the Microstructure and Dielectric Properties of Ceramics in Quenched State, Ceramic Surge Arrester, 2017 Ser. No. 275 (128-131)" prepared CCTO ceramics by solid phase method and air quenching cooling method, but the result was a large loss Amplitude improves, this result is contrary to the result of the present invention, does not match the demand of low-loss CCTO ceramics

Images