Microwave dielectric ceramic BiNbW2O10 capable of being sintered at low temperature and preparation method thereof

Abstract

The invention discloses microwave dielectric ceramic BiNbW2O10 capable of being sintered at low temperature and a preparation method thereof. The composition of the microwave dielectric ceramic capable of being sintered at low temperature is BiNbW2O10. The preparation method comprises the following steps of: (1) weighing the original powder of Bi2O3, Nb2O5 and WO3 having the purity of more than 99.9% according to the chemical formula BiNbW2O10, and mixing all the original powder together; (2) performing mixing and wet ball milling on the raw materials of the step (1) for 12 hours while taking distilled water as a solvent, and pre-sintering for 6 hours in atmosphere at 850 DEG C; (3) adding a binder to the powder obtained in the step (2) and pelleting, then carrying out compression molding, and finally sintering for 4 hours in atmosphere at the temperature ranging from 900 to 930 DEG C, wherein the binder is a polyvinyl alcohol solution having the mass concentration of 5%, and the dosage of the binder is 3% of the total weight of the powder. The ceramic prepared by the preparation method disclosed by the invention is well sintered at the temperature ranging from 900 to 930 DEG C; the dielectric constant of the ceramic is in the range from 17 to 18, the value of the quality factor Qf of the ceramic is within the range from 86000 to 98000 GHz and the temperature coefficient of resonant frequency of the ceramic is low; the ceramic can be co-sintered at the low temperature with an Ag electrode and has an enormous application value in industry.

Description

technical field [0001] The invention relates to a dielectric ceramic material, in particular to a microwave dielectric ceramic material for microwave components used at microwave frequencies, such as a dielectric substrate, a resonator, and a filter, and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in circuits in the microwave frequency band (mainly UHF and SHF bands) and perform one or more functions. They are widely used as resonators, filters, and dielectric substrates in modern communications. Components such as chips and dielectric waveguide circuits are the key basic materials of modern communication technology. They have been used in portable mobile phones, car phones, cordless phones, TV satellite receivers and military radars. They are used in modern communication tools. It is playing an increasingly important role in the process of miniaturization and integration. ...

AI Technical Summary

Problems solved by technology

In recent years, with the development of low temperature co-fired ceramics (Low Temperature Co-fired Ceramics, LTCC) and the requirements of the development of microwave multilayer devices, researchers at home and abroad have carried out extensive exploration and research on some low-temperature co-fired materials, mainly The glass-ceramic or glass-ceramic composite material system is used. Because the low melting point glass phase has relatively high dielectric loss, the existence of the glass phase greatly improves the dielectric loss of the material.

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