Temperature-stable microwave dielectric ceramic lipo3 capable of low-temperature sintering and preparation method thereof

Abstract

The invention discloses application of a phosphorous compound LiPO3 as a temperature stabilization type microwave dielectric ceramic capable of being sintered at the low temperature. A preparation method of the temperature stabilization type microwave dielectric ceramic comprises the following steps: (1) weighing and proportioning initial powders Li2CO3 and NH4H2PO4 which have the purity more than 99.9% according to a chemical formula of LiPO3; (2) performing wet ball milling and mixing on the raw materials in the step (1) for 12 hours, drying and pre-sintering in the atmosphere at 800 DEG C for 6 hours, wherein a ball milling medium is ethanol; (3) adding a bonder into the powder prepared in the step (2), granulating, pressing for forming, and sintering in the atmosphere at 850-880 DEG C for 4 hours, wherein the bonder adopts a polyvinyl alcohol with the mass concentration of 5% and accounts for 3wt% of the powder. The prepared ceramic is good in sintering performance at 850-880 DEG C, small in temperature coefficient of resonant frequency and good in temperature stability, and has very high application value industrially; the dielectric constant is 10-11 and the quality factor (Qf) value reaches up to 74,000-91,000GHz.

Description

technical field [0001] The invention relates to a dielectric ceramic material, in particular to a dielectric substrate, a resonator, a filter and other microwave components used at microwave frequencies, as well as a dielectric ceramic material for 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. 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...

AI Technical Summary

Problems solved by technology

The main problem is that the resonant frequency temperature coefficient of most of the low-temperature sinterable single-phase microwave dielectric ceramic materials that have been publicly reported is too large, which cannot ensure that the device has good thermal stability, which largely limits Low temperature co-firing technology and the development of microwave multilayer devices

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