Low-temperature sintering temperature-stable microwave dielectric ceramic Bi14W2O27 and preparation method thereof

Abstract

The invention discloses a low-temperature sintering temperature-stable microwave dielectric ceramic and a preparation method thereof. The composition formula of the low-temperature sintering temperature-stable microwave dielectric ceramic is Bi14W2O27. The preparation method comprises the steps of (1) weighing and batching original powder of Bi2O3 and WO3 with the purity being over 99.9% according to the chemical formula Bi14W2O27; (2) carrying out wet ball-milling and mixing on raw materials obtained in the step (1) for 12 hours, taking distilled water as a solvent, drying, and then, pre-sintering in an air atmosphere for 6 hours at the temperature of 700 DEG C; (3) adding a binder into powder prepared in the step (2), granulating, then, carrying out compression molding, and finally, sintering in the air atmosphere for 4 hours at the temperature of 800-820 DEG C, wherein a polyvinyl alcohol solution with the mass concentration of 5% is adopted as the binder, and the dosage of the binder accounts for 3% of the total mass of the powder. According to the ceramic prepared by the preparation method, the sintering at the temperature of 800-820 DEG C is good, the dielectric constant reaches 12-13, the quality factor (Qf) reaches up to 61,000-84,000GHz, the temperature coefficient of resonance frequency is small, and the ceramic can be subjected to low-temperature co-sintering together with a Ag electrode, so that the ceramic has a great application value in industries.

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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