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High-dielectric microwave ceramic dielectric material, and preparation method and use thereof

A technology of microwave ceramics and dielectric materials, applied in the field of ceramic dielectric materials, can solve problems such as device reliability decline, material component volatilization, material performance fluctuations, etc., to improve Q*f value, increase grain boundary defects, and good consistency Effect

Active Publication Date: 2015-08-19
XIAMEN WANMING ELECTRONICS
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Problems solved by technology

Barium tantalum magnesium oxide (BMT for short) is a microwave ceramic material with a very high Q value, especially suitable for high-frequency microwaves, such as satellite communication resonators, etc. Due to the high sintering temperature of pure BMT, it can reach above 1600 °C , such a high sintering temperature is likely to cause volatilization of material components, resulting in fluctuations in material properties and a decrease in device reliability
In order to obtain high-reliability BMT microwave ceramic dielectric materials, reducing the sintering temperature is one of the effective ways. Usually, people use the addition of sintering aids to reduce the firing temperature, but the introduction of sintering aids is likely to cause high-frequency devices Heat generation and performance deterioration limit the application of microwave ceramics

Method used

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  • High-dielectric microwave ceramic dielectric material, and preparation method and use thereof
  • High-dielectric microwave ceramic dielectric material, and preparation method and use thereof
  • High-dielectric microwave ceramic dielectric material, and preparation method and use thereof

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Embodiment 1

[0024] Embodiment 1: The composition of the microwave ceramic dielectric material in this embodiment is shown in Table 1 and Table 2.

[0025] The preparation of the microwave ceramic dielectric material in this embodiment is as follows:

[0026] (1) Preparation of major ingredients: with barium chloride, strontium chloride, magnesium chloride, titanium chloride, and tantalum chloride as raw materials, they are prepared into aqueous solutions with a concentration of 2mol / L respectively, according to the ratio of each component in the major ingredients Mix, add ammonium bicarbonate or sodium bicarbonate as a precipitant according to 1.5 times the mole fraction of the raw materials, and use the chemical co-precipitation method to generate a precursor precipitate. After filtering and washing, lithium carbonate is used as a raw material. According to the main material The proportion of each component in the mixture is mixed with the precursor precipitate, stirred uniformly, dried,...

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Abstract

The invention discloses a high-dielectric microwave ceramic dielectric material, and a preparation method and an application thereof. The high-dielectric microwave ceramic dielectric material is composed of a main material and an additive and is characterized in that the main material has a structural formula of X(Ba1 / 2Li)(Mg1 / 3Ta2 / 3)O3-(1-X)SrTiO3, wherein 0.55<=X<=0.75; the additive is one or more of ZnO, MnO2, Nb2O5, Li2CO3 and CaCO3. The weight percentage of the main material is 95-99%, and the weight percentage of the additive is 1-5%. The main material compound is prepared by a chemical co-precipitation method, a calcining synthetic temperature is lower than that of a traditional solid phase method, and the method has the characteristics of low energy consumption, high material purity, uniform composition and high surface activity. Microwave ceramic devices after sintering are good in consistency and dense in ceramic bodies, and can better adapt to application requirements of high-quality microwave devices.

Description

technical field [0001] The invention relates to the field of ceramic dielectric materials, in particular to a high-medium microwave ceramic dielectric material, a preparation method and an application. Background technique [0002] Microwave communication is widely used in modern communication technology, and microwave ceramic devices play an important role in microwave communication. At present, the development of microwave ceramic dielectric materials for high-performance microwave devices has been valued by many researchers. Barium tantalum magnesium oxide (BMT for short) is a microwave ceramic material with a very high Q value, especially suitable for high-frequency microwaves, such as satellite communication resonators, etc. Due to the high sintering temperature of pure BMT, it can reach above 1600 °C , such a high sintering temperature is likely to cause the volatilization of material components, resulting in fluctuations in material properties and a decrease in device...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 黄景林黄景明
Owner XIAMEN WANMING ELECTRONICS
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