Microwave dielectric ceramics and preparation process thereof

Abstract

The invention discloses microwave dielectric ceramics and a preparation process thereof, belonging to the technical field of microwave dielectric materials and manufacture thereof. The microwave dielectric ceramics comprises carbonate, oxide and Na, Gd, Dy, Er, Lu and Ti organic matters, and has a chemical formula of Na0.5Re4.5Ti4O15, wherein Re=Gd, Dy, Er and Lu. The invention provides a novel rare-earth-containing microwave dielectric material, and the selection range of a microwave dielectric application material is enlarged; and aiming at the microwave dielectric ceramics, the invention provides a novel matched process, namely, the microwave dielectric ceramics with better ceramic formation is obtained by combination of a process of preparing a powder material by adopting a sol-gel process and a process of preparing the ceramics by adopting a solid-phase reaction process.

Description

technical field [0001] The invention belongs to the technical field of microwave dielectric materials and their manufacture, and in particular relates to microwave dielectric ceramics used in microwave devices such as dielectric resonators and multilayer filters in systems such as mobile and satellite communications. Background technique [0002] Microwave dielectric ceramics are used in microwave, satellite communication, mobile communication, electronic countermeasure equipment, etc. They are key materials for microwave components such as resonators, filters, and dielectric waveguide circuits widely used in modern communications, and play an important role in microwave circuit systems. A series of circuit functions such as dielectric isolation, dielectric waveguide and dielectric resonance. Ideal microwave dielectric ceramics have high relative permittivity, low loss means high quality factor Q · f value (GHz) and temperature coefficient of resonant frequency tending to ...

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Problems solved by technology

However, there are still problems to be solved in these methods, such as the high production cost of the co-precipitation method, which is difficult to carry out large-scale production, and the uneven microscopic distribution of raw materials in the conventional solid-phase method makes it difficult to fully react to obtain a high-purity target phase; It is easy to introduce impurities, which may damage the performance of ceramic materials; the sintering temperature of ceramics is also high

At the same time, the selection of material preparation method needs to meet certain requirements of the crystal structure and crystal growth of the prepared material. The same preparation method such as sol-gel method will produce different effects when preparing different materials, such as the crystal grain is too small This leads to the volatilization of material components and the poor density of the prepared materials.

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