Low-temperature sinterable molybdenum-based microwave dielectric ceramic Ba4Li2Mo2O11

Abstract

The invention discloses a low-temperature sinterable molybdenum-based microwave dielectric ceramic Ba4Li2Mo2O11 and a preparation method thereof. The chemical composition of the material of the low-temperature sinterable molybdenum-based microwave dielectric ceramic is Ba4Li2Mo2O11. The preparation method comprises: (1) weighing and proportioning original powders of BaCO3, Li2CO3 and MoO3 each with purity of 99.9% or more according the chemical formula of Ba4Li2Mo2O11; (2) performing wet-type ball milling and mixing on the raw materials of the step (1) for 12 h with a solvent of distilled water, drying, pre-burning for 6 h under atmosphere at 600 DEG C; and (3) adding a binder into the powder prepared in the step (2) and granulating, then performing compaction molding, and finally sintering under atmosphere at 800-830 DEG C for 4 h; wherein the binder employs a polyvinyl alcohol solution with a mass concentration of 5%, and accounts for 3% by mass of the whole powder. The prepared ceramic by the preparation method has good sintering at 800-830 DEG C, a dielectric constant of 17-18, a quality factor (Qf value) of up to 71000-90000 GHz, a small temperature coefficient of resonate frequency, and great 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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