Microwave dielectric ceramic with near-zero frequency temperature coefficient and preparation method thereof

Abstract

A microwave dielectric ceramic with near-zero frequency temperature coefficient and a preparation method thereof belong to the technical field of microwave dielectric materials and its manufacture. Ceramic chemical formula: Ca 1-x Zn x La 4 Ti 5 o 17 , x=0.005~0.4. CaCO 3 , ZnO, La 2 o 3 、TiO 2 As raw materials, wet grinding and mixing, drying to make powder, calcining at 1100-1200°C, wet grinding, drying, adding polyvinyl alcohol (PVA), pressing and molding, and sintering in a high-temperature furnace for 2-4 hours. Microwave dielectric ceramics. The dielectric constant of the microwave dielectric ceramic of the present invention is between 56 and 58, the Q×f value is between 8200 and 18500 GHz, and the temperature coefficient of resonance frequency is less than 15%; it can be widely used in microwave devices such as various dielectric resonators and filters Manufacture to meet the technical requirements of mobile communication, satellite communication and other systems, and increase the types of medium dielectric constant microwave dielectric ceramic materials.

Description

technical field [0001] The invention belongs to the technical field of microwave dielectric material manufacture, and in particular relates to a multiphase ceramic compound based on oxides. Specifically, it relates to a ceramic compound whose main component is a layered perovskite compound. Background technique [0002] Microwave dielectric ceramics are the core materials of microwave devices. In the past ten years, due to the rapid development of microwave technology and equipment towards miniaturization and integration, especially towards the direction of large output and low price for civilian use, a large number of microwave dielectric ceramic materials suitable for various microwave frequency bands have been developed. Dielectric ceramics used in microwave circuits should meet the following requirements for dielectric characteristics: (1) High relative permittivity ε r To reduce device size, it is generally required that ε r ≥20; (2) High quality factor Q to reduce n...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the CaLa 4 Ti 5 o 17 Due to the disadvantages of poor temperature stability and high sintering temperature of dielectric ceramics, a series of microwave dielectric ceramics with close to zero temperature coefficient and high quality factor are obtained by replacing part of CaO with ZnO. 1-x Zn x La 4 Ti 5 o 17 Composition formula of dielectric ceramic and method for preparing the dielectric ceramic product