Microwave dielectric ceramic and preparation method thereof

A microwave dielectric ceramic and ceramic technology, applied in the field of microwave dielectric ceramics, can solve the problems of large equipment loss and high energy consumption, and achieve the effects of low cost, low sintering temperature and suitable for large-scale industrialization

Active Publication Date: 2019-10-25
GUANGDONG GOVA ADVANCED MATERIAL TECH
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Problems solved by technology

Now research more (1-x)CaTiO with a dielectric constant of about 45 3 -xLaAlO 3 The sintering temperature of the system is higher than 1500°C, the energy consumption is large, and the equipment loss is large, which limits its application to a certain extent

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  • Microwave dielectric ceramic and preparation method thereof
  • Microwave dielectric ceramic and preparation method thereof
  • Microwave dielectric ceramic and preparation method thereof

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preparation example Construction

[0043] The present invention also provides a method for preparing microwave dielectric ceramics described in the above technical solution, comprising the following steps:

[0044] a) CaCO 3 、Sm 2 o 3 、TiO 2 and Al 2 o 3 After mixing, the first grinding treatment is carried out, and then pre-sintering is carried out to obtain pre-sintered material; then the obtained pre-sintered material is subjected to second grinding treatment to obtain powder;

[0045] b) adding a binder to the powder obtained in step a) for granulation and molding to obtain a ceramic green body; and then sintering the obtained ceramic green body to obtain a microwave dielectric ceramic.

[0046] In the present invention, CaCO 3 、Sm 2 o 3 、TiO 2 and Al 2 o 3 After mixing, the first grinding treatment is carried out, and then pre-sintering is carried out to obtain pre-sintered material; then the obtained pre-sintered material is subjected to second grinding treatment to obtain powder. The present ...

Embodiment 1

[0076] (1) Weigh 29.95g CaCO according to x=0.15 3 , 108.95g Sm 2 o 3 , 59.75g TiO 2 and 1.35g Al 2 o 3 The above raw materials, zirconium balls, and deionized water are wet-milled with a planetary mill for 4 hours at a mass ratio of 1:3:2, dried at 120°C, and pre-fired at 1050°C (in the atmosphere) for 3 hours. The heating rate was 3°C / min, and then cooled with the furnace to obtain calcined material; the calcined material, zirconium balls, and deionized water were ball-milled with a planetary mill for 4 hours at a mass ratio of 1:3:2, and then heated at 120 After drying at ℃, microwave dielectric ceramic powder is obtained.

[0077] (2) In the microwave dielectric ceramic powder that step (1) obtains, add the binder of powder material quality 20%, granulate and grind 1h, cross 80 mesh sieves, then the powder that obtains is pressed (pressure is 100MPa) into A thin cylindrical green body with a thickness of 6mm and a diameter of 13mm is finally sintered into porcelain a...

Embodiment 2

[0083] (1) Weigh 29.95g CaCO according to x=0.15 3 , 108.95g Sm 2 o 3 , 59.75g TiO 2 and 1.35g Al 2 o 3 ; The above raw materials, zirconium balls, and deionized water are wet-milled with a planetary mill for 4 hours at a mass ratio of 1:3:2, dried at 120°C, and pre-fired at 1050°C (in the atmosphere) for 3 hours , the heating rate is 3°C / min, and then cooled with the furnace to obtain calcined material; the calcined material is mixed with additives to obtain a mixture of calcined material and additives, wherein the amount of additives is 0.5% of the mass of calcined material ; The mixture of pre-fired material and additives, zirconium balls, and deionized water are wet-milled with a planetary mill for 4 hours at a mass ratio of 1:3:2, and dried at 120°C to obtain microwave dielectric ceramic powder .

[0084] (2) In the microwave dielectric ceramic powder that step (1) obtains, add the binder of powder material quality 20%, granulate and grind 1h, cross 80 mesh sieves, ...

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Abstract

The invention provides a microwave dielectric ceramic and a preparation method thereof. The microwave dielectric ceramic has the following general formula: (1-x)Ca2Sm4Ti5O18-xSmAlO3, wherein x=0.05 to0.25. Compared with the prior art, the microwave dielectric ceramic provided by the invention uses a composite oxide represented by the above specific general formula as a main material, and throughadjustment of a content of SmAlO3, the dielectric constant is about 45, and the frequency temperature coefficient is continuously adjustable; the microwave dielectric ceramic has a stable structure, aspecific dielectric constant, a higher Q x f value, and a continuously-adjustable resonant frequency temperature coefficient; experimental results show that the microwave dielectric ceramic providedby the invention has the dielectric constant of 40 to 46.1, the Q x f value is >30000 GHz and can be as high as 49700 GHz, compared with other microwave dielectric ceramic system with the same dielectric constant, the system provided by the invention has a high Q x f value and low dielectric loss; and at the same time, the resonant frequency temperature coefficient is continuously adjustable in the range from -7.4 PPM/ DEG C to +6.7 PPM/ DEG C, and the microwave dielectric ceramic provided by the invention is suitable for large-scale commercial use.

Description

technical field [0001] The invention relates to the technical field of microwave dielectric ceramics, and more specifically relates to a microwave dielectric ceramic and a preparation method thereof. Background technique [0002] The upcoming fifth generation of wireless networks and technologies (5G), it has a big leap in data transmission speed, capacity and data transmission delay compared to the fourth generation (4G) network. A series of new technologies brought by 5G will re-establish public and personal business standards in various fields such as virtual reality, driverless driving, smart cities, and the Internet of Everything. The main spectrum options for deploying 5G networks worldwide are Sub-6 and millimeter waves. Sub-6 has attracted much attention due to its improved propagation range and the ability to provide the same coverage and performance with fewer base stations. Dielectric waveguide filters in this frequency band urgently need microwave dielectric cer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/50C04B35/622
CPCC04B35/462C04B35/50C04B35/622C04B2235/3208C04B2235/3224C04B2235/3222C04B2235/3418C04B2235/3225
Inventor 殷旺吕开明曾福杰马才兵
Owner GUANGDONG GOVA ADVANCED MATERIAL TECH
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