CN116120059A - Large-dielectric-constant microwave dielectric ceramic and preparation method thereof - Google Patents
Large-dielectric-constant microwave dielectric ceramic and preparation method thereof Download PDFInfo
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- 230000000052 comparative effect Effects 0.000 description 4
- 238000010295 mobile communication Methods 0.000 description 3
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- 238000011161 development Methods 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
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- 239000002356 single layer Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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Abstract
The invention relates to a microwave dielectric ceramic with large dielectric constant and a preparation method thereof, wherein the chemical composition formula is aBaO-bCAO-cZrO 2 ‑dTiO 2 ‑eTa 2 O 5 The molar ratio of fSrO is 15% or less than 25%, 25% or less than 35%, 5% or less than 10%, 40% or less than 45%, 2% or less than 4% or less than 2% e, and 2% or less than 5% f. The sintering temperature is 1300-1350 ℃. The invention has the advantages that: the composition and the preparation method are reasonable in design, the obtained microwave dielectric ceramic material is good in microwave performance, the dielectric constant is 350+/-20, the qf value is more than or equal to 3500GHz, the dielectric loss is less than or equal to 0.07%, the preparation method is simple to operate, the repeatability is good, the requirement on equipment is low, and the microwave dielectric ceramic material is very suitable for popularization and use.
Description
Technical Field
The invention relates to a high-dielectric-constant microwave dielectric ceramic and a preparation method thereof, belonging to the technical field of electronic ceramics and preparation thereof.
Background
The microwave dielectric ceramic is a ceramic material which is used as a dielectric material in a microwave frequency band (mainly 300MHz-300GHz frequency band) circuit and performs one or more functions, and is a key material for manufacturing a microwave dielectric filter and a resonator. With the rapid development of mobile communication industry, novel microwave elements such as a dielectric resonator, a dielectric antenna, a duplexer, a dielectric guided wave loop, a dielectric frequency stabilization oscillator and the like made of functional ceramic materials are widely applied to various fields such as mobile communication, satellite television broadcast communication, scattering communication military radars, satellite navigation positioning systems and the like. In recent years, due to the rapid development of fields such as mobile communication, aerospace, military, modern medicine and the like, higher requirements are also put forward on microwave dielectric ceramic materials, so that searching, preparing and researching a novel microwave dielectric ceramic with proper dielectric constant, low loss, near zero resonance frequency temperature coefficient and low cost and environmental friendliness becomes a hot spot and key point of current research.
In recent years, there is a trend of SLCC (single layer thin film capacitor) used in the microwave frequency band, and it is highly demanded to reduce the size of SLCC by using as high a dielectric constant as possible, thereby achieving the demands of light weight, thin, short, and small. However, the dielectric constant of the microwave ceramic dielectric material is limited, and once the dielectric constant exceeds the upper limit value, the microwave characteristics of the material itself are substantially lost and cannot be exhibited.
In the prior art, the high-dielectric-constant microwave dielectric ceramic basically reaches about 200 (for example, CN103467083A low-temperature sintered high-dielectric-constant microwave dielectric ceramic and a preparation method thereof, the dielectric constant is 114-129), and the high-performance microwave dielectric ceramic material with the dielectric constant above 200 has a few defects.
Disclosure of Invention
The invention provides a high-dielectric-constant microwave dielectric ceramic and a preparation method thereof, and aims to fill the blank in the prior art, and effectively improve the dielectric constant of the microwave dielectric ceramic on the premise of ensuring simple operation, good repeatability and low equipment requirement of the preparation method.
The technical solution of the invention is as follows: a microwave dielectric ceramic with large dielectric constant has a chemical composition formula of aBaO-bCAO-cZrO 2 -dTiO 2 -eTa 2 O 5 The molar ratio of fSrO is 15% or less than 25%, 25% or less than 35%, 5% or less than 10%, 40% or less than 45%, 2% or less than 4% or less than 2% e, and 2% or less than 5% f. The dielectric constant of the obtained finished microwave dielectric ceramic is 350+/-20, the dielectric constant of the microwave dielectric ceramic material is effectively improved, the Qf value is more than or equal to 3500GHz, and the dielectric loss is less than or equal to 0.07%.
The preparation method comprises the following steps:
(1) According to aBaO-bCAO-cZrO 2 -dTiO 2 -eTa 2 O 5 Molar ratio in fSrO BaCO 3 、TiO 2 、CaCO 3 、ZrO 2 、Ta 2 O 3 、SrO 3 Ball milling, drying and presintering after mixing to obtain a main phase material;
(2) And (3) ball milling, drying and granulating the material obtained in the step (1) again, and forming, sintering and sintering at 1300-1350 ℃ to obtain the finished microwave dielectric ceramic.
The invention has the advantages that: the composition and the preparation method are reasonable in design, the obtained microwave dielectric ceramic material is good in microwave performance, the dielectric constant is 350+/-20, the qf value is more than or equal to 3500GHz, the dielectric loss is less than or equal to 0.07%, the preparation method is simple to operate, the repeatability is good, the requirement on equipment is low, and the microwave dielectric ceramic material is very suitable for popularization and use.
Detailed Description
The present invention will be described in further detail with reference to examples and embodiments.
Examples 1 to 3 and comparative examples 1 to 3
A microwave dielectric ceramic with large dielectric constant has a chemical composition formula of aBaO-bCAO-cZrO 2 -dTiO 2 -eTa 2 O 5 fSrO. Wherein a, b, c, d, e, f is the molar ratio content. The molar ratios of the examples and comparative examples are set forth in the following table.
A preparation method of a microwave dielectric ceramic with a large dielectric constant comprises the following steps:
(1) According to aBaO-bCAO-cZrO 2 -dTiO 2 -eTa 2 O 5 Molar ratio in fSrO BaCO 3 、TiO 2 、CaCO 3 、ZrO 2 、Ta 2 O 3 、SrO 3 Ball milling, drying and presintering after mixing to obtain a main phase material;
(2) And (3) ball milling, drying and granulating the material obtained in the step (1) again, and forming, sintering and sintering the material at the temperature shown in the following table to finally obtain the finished microwave dielectric ceramic.
The dielectric constants (Er/Dk), qf values and dielectric losses (Df) of the microwave dielectric ceramics of the finished products of the examples and the comparative examples are shown in the following table respectively:
as can be seen from the table above, the dielectric constant of each embodiment of the invention is 350+/-20, the qf value is more than or equal to 3500GHz, the dielectric loss is less than or equal to 0.07%, and the dielectric loss is obviously better than that of each comparative example.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and improvements could be made by those skilled in the art without departing from the inventive concept, which falls within the scope of the present invention.
Claims (2)
1. The microwave dielectric ceramic with the large dielectric constant is characterized by comprising the following chemical composition formula: aBaO-bCAO-cZrO 2 -dTiO 2 -eTa 2 O 5 -fSrO with a molar ratio of 15% or less than 25%, 25% or less than 35% b, 5% or less than 10% c, 40% or less than 45% d, 2% or less than 4% e, 2% or less than 5% f; the dielectric constant of the microwave dielectric ceramic is 350+/-20, the qf value is more than or equal to 3500GHz, and the dielectric loss is less than or equal to 0.07%.
2. The method for preparing the microwave dielectric ceramic with the large dielectric constant as claimed in claim 1, comprising the following steps:
(1) According to the aBaO-bCAO-cZrO 2 -dTiO 2 -eTa 2 O 5 Molar ratio in fSrO BaCO 3 、TiO 2 、CaCO 3 、ZrO 2 、Ta 2 O 3 、SrO 3 Ball milling, drying and presintering after mixing to obtain a main phase material;
(2) And (3) ball milling, drying and granulating the material obtained in the step (1) again, and forming, sintering and sintering at 1300-1350 ℃ to obtain the finished microwave dielectric ceramic.
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| CN202211651268.2A CN116120059B (en) | 2022-12-21 | 2022-12-21 | Large-dielectric-constant microwave dielectric ceramic and preparation method thereof |
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| CN202211651268.2A CN116120059B (en) | 2022-12-21 | 2022-12-21 | Large-dielectric-constant microwave dielectric ceramic and preparation method thereof |
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| CN116120059B CN116120059B (en) | 2024-07-26 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1438199A (en) * | 2003-03-20 | 2003-08-27 | 武汉理工大学 | High-dielectric-constant ceramic and making method thereof |
| JP2004018365A (en) * | 2002-06-20 | 2004-01-22 | Nippon Tungsten Co Ltd | Composition for microwave dielectric ceramic and method of manufacturing the ceramic |
| KR20040025177A (en) * | 2002-09-18 | 2004-03-24 | (주) 알엔투테크놀로지 | Low temperature cofired ceramic composition, and its use |
| US20190304685A1 (en) * | 2018-03-28 | 2019-10-03 | Samsung Electronics Co., Ltd. | Dielectric material, multi-layered capacitors and electronic devices comprising the same |
| CN111954649A (en) * | 2018-04-11 | 2020-11-17 | 昭荣化学工业株式会社 | Dielectric ceramic composition and ceramic electronic component |
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- 2022-12-21 CN CN202211651268.2A patent/CN116120059B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004018365A (en) * | 2002-06-20 | 2004-01-22 | Nippon Tungsten Co Ltd | Composition for microwave dielectric ceramic and method of manufacturing the ceramic |
| KR20040025177A (en) * | 2002-09-18 | 2004-03-24 | (주) 알엔투테크놀로지 | Low temperature cofired ceramic composition, and its use |
| CN1438199A (en) * | 2003-03-20 | 2003-08-27 | 武汉理工大学 | High-dielectric-constant ceramic and making method thereof |
| US20190304685A1 (en) * | 2018-03-28 | 2019-10-03 | Samsung Electronics Co., Ltd. | Dielectric material, multi-layered capacitors and electronic devices comprising the same |
| CN111954649A (en) * | 2018-04-11 | 2020-11-17 | 昭荣化学工业株式会社 | Dielectric ceramic composition and ceramic electronic component |
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Inventor after: Ji An Inventor after: Jin Zhenlong Inventor after: Dong Shixue Inventor before: Ji An Inventor before: Wang Xiaohui Inventor before: Jin Zhenlong Inventor before: Dong Shixue |
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