Low-temperature sinterable lithium-based microwave dielectric ceramic Li2W2O7 and preparation method thereof

Abstract

The invention discloses low-temperature sinterable lithium-based microwave dielectric ceramic Li2W2O7 and a preparation method thereof. The composition of the dielectric ceramic material is Li2W2O7. The preparation method comprises the following steps: (1) proportioning Li2CO3 having a purity of 99.9% or above and WO3 original powder according to Li2W2O7; (2) performing wet type ball milling and mixing on the raw materials in the step (1) for 12 hours by taking distilled water as solvent, drying, and then presintering at 450 DEG C in atmosphere for 6 hours; and (3) adding a binding agent into the powder prepared in the step (2), granulating, performing compression molding, and finally sintering at 510-530 DEG C in atmosphere for 4 hours, wherein the binding agent is a polyvinyl alcohol solution having a mass concentration of 5% and accounts for 3% of the total amount of the powder. The ceramic prepared by the invention can be favorably sintered at 510-530 DEG C, the dielectric constant is up to 13-14, the quality factor Qf value is up to 61000-68000 GHz, and the temperature coefficient of resonance frequency is low, thus ensuring that the invention has great application value industrially.

Description

technical field [0001] The invention relates to a dielectric ceramic material, in particular to a dielectric resonator, a filter and other microwave components used at microwave frequencies, as well as the dielectric ceramic material of a ceramic capacitor or a temperature compensation capacitor 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. Chips, dielectric waveguide circuits and other components are the key basic materials of modern communication technology. They have been used in portable mobile phones, car phones, cordless phones, TV satellite receivers, military radars, etc. It is playing an increasingly important role in the process of miniaturization and integration....

AI Technical Summary

Problems solved by technology

However, the system for low-fired microwave dielectric ceramics is still relatively limited, which largely limits the development of low-temperature co-firing technology and microwave multilayer devices

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