Low temperature sintered microwave dielectric ceramic Li2Ba1-xSrxTi4O16 and preparation method thereof

A technology of li2ba1-xsrxti4o16 and microwave dielectric ceramics, which is applied in the field of dielectric ceramic materials, can solve the problems of limited system, limited low-temperature co-firing technology and the development of microwave multilayer devices, and achieves small resonance frequency temperature coefficient and great application value Effect

Inactive Publication Date: 2011-11-23
GUILIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, the system for low-fired microwave dielectric ceramics is still relatively limited, which la

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  • Low temperature sintered microwave dielectric ceramic Li2Ba1-xSrxTi4O16 and preparation method thereof

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[0016] Examples:

[0017] Table 1 shows several specific examples of the content of each component of the present invention and their microwave dielectric properties. The preparation method is as described above, and the microwave dielectric properties are evaluated by the cylindrical dielectric resonator method.

[0018] Table 1:

[0019]

[0020] This ceramic can be widely used in the manufacture of microwave devices such as various dielectric resonators and filters, and can meet the technical needs of mobile communication, satellite communication and other systems.

[0021] Elements with similar structure and chemical properties to Ba and Sr, such as Ca, Pb, etc., can also be made into dielectric ceramics with similar crystal structure and properties to the present invention.

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Abstract

The invention discloses a low temperature sintered microwave dielectric ceramic Li2Ba1-xSrxTi4O16 and a preparation method thereof. The components of the ceramic are shown in the formula of Li2Ba1-xSrxTi4O16, wherein x is more than or equal to 0 and less than or equal to 1. The preparation method comprises the following steps of: preparing raw materials of BaCO3, SrCO3, Li2CO3 and TiO2 original powder with the purity of over 99.9 percent according to the formula of Li2Ba1-xSrxTi4O16, wherein x is more than or equal to 0 and less than or equal to 1; mixing the prepared raw materials for 12 hours through wet ball-milling, wherein a solvent is distilled water; drying, and pre-sintering at 900DEG C in the air for 6 hours; adding an adhesive into the pre-sintered powder, granulating, and pressing for formation; and sintering at the temperature of between 950 and 1,050DEG C in the air for 4 hours, wherein the adhesive is a 5 mass percent polyvinyl alcohol solution and is 3 percent of the total weight of the pre-sintered powder. The ceramic is well sintered at the temperature of between 950 and 1,050DEG C, has the dielectric constant of 32-40, the quality factor Qf value of 60,000-100,000GHz, small temperature coefficient of resonance frequency, and great application value in industry.

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 microwave frequency band (mainly UHF, SHF frequency band) circuits 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. ...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/47C04B35/622
Inventor 方亮苏聪学廖维刘勤文
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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