Low temperature sintering microwave dielectric ceramic Ca2Bi2O5 and preparation method thereof

Abstract

The invention discloses low temperature sintering microwave dielectric ceramic Ca2Bi2O5 and a preparation method thereof. Composition of the low temperature sintering microwave dielectric ceramic is Ca2Bi2O5. The preparation method comprises the following steps: (1) weighing and dosing original powder of CaCO3 and Bi2O3 with the purity over 99.9% according to the chemical formula Ca2Bi2O5; (2) wet-type ball-milling and mixing the raw material in step (1) for 12 hours, wherein the solvent is distilled water, and drying and pre-sintering for 6 hours in atmosphere at 750 DEG C; and (3) adding a binder into the powder prepared in step (2) and prilling, then, pressing to mould, and finally, sintering for 4 hours in atmosphere at 820-850 DEG C, wherein the binder is polyvinyl alcohol liquor with mass concentration of 5%, and the dose accounts for 3% of total weight of the powder. The ceramic disclosed by the invention is well sintered at 820-850 DEG C, and the dielectric constant reaches 1-20, the quality factor Qf value reaches 62000-89000GHz and the temperature coefficient of resonance frequency is small. The ceramic has an extremely huge 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

Therefore, the development of low-fired microwave dielectric ceramic materials without glass phase is the focus of current research. At present, the high-performance microwave dielectric ceramic system that can be sintered at low temperature is still very limited, which limits the development of low-temperature co-firing technology and microwave multilayer devices to a large extent. develop

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