Microwave dielectric ceramic and preparation method thereof

Abstract

A novel microwave dielectric ceramic and a preparation method of the novel microwave dielectric ceramic belong to a microwave dielectric material and the technical field of microwave dielectric material manufacture. The microwave dielectric ceramic is composed of K, Dy, Ho, Er, Yb, Lu and Ti in modes of carbonate and oxide, a chemical formula of the microwave dielectric ceramic is K0.5Re4.5Ti4O15, and the Re is equal to the Dy, Ho, Er, Yb, Lu in the formula. The novel microwave dielectric ceramic provides a new material containing a rare earth microwave dielectric and expands selecting ranges of microwave dielectric application materials. A matched process is provided for the microwave dielectric ceramic, and the microwave dielectric ceramic with a good ceramic forming ratio is obtained.

Description

technical field [0001] The invention belongs to the technical field of manufacturing microwave dielectric materials, in particular to microwave dielectric ceramics used in microwave devices such as dielectric resonators and multilayer filters in mobile and satellite communication systems. 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 zero . [0003] In recent...

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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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