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MAS-LT composite microwave dielectric ceramic and preparation method thereof

A technology of microwave dielectric ceramics and ceramics, applied in the field of microwave dielectric ceramics, can solve the problems of high sintering temperature, limitation of large-scale use, large frequency temperature coefficient, etc., and achieve low sintering temperature, suitable for large-scale industrialization, and dielectric constant high effect

Active Publication Date: 2019-10-22
GUANGDONG GOVA ADVANCED MATERIAL TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cordierite system, forsterite system, and willemite system that have been studied at this stage all have the shortcomings of excessive frequency temperature coefficient and high sintering temperature, which limits large-scale application

Method used

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  • MAS-LT composite microwave dielectric ceramic and preparation method thereof

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preparation example Construction

[0047] The present invention also provides a method for preparing the MAS-LT composite microwave dielectric ceramic described in the above technical solution, comprising the following steps:

[0048] a) MgCO 3 、BaCO 3 、Al 2 o 3 and SiO 2 After mixing, the first grinding treatment is carried out, and then the first pre-sintering is carried out to obtain the MAS pre-sintered material;

[0049] b) put Li 2 CO 3 and TiO 2 After mixing, carry out the second grinding treatment, and then go through the second pre-sintering to obtain LT pre-sintered material;

[0050] c) After mixing the MAS calcined material and the LT calcined material, perform the third grinding treatment to obtain MAS-LT powder;

[0051] d) adding a binder to the MAS-LT powder for granulation and molding to obtain a ceramic green body; then sintering the obtained ceramic green body to obtain a MAS-LT composite microwave dielectric ceramic;

[0052] The steps a) and b) are not limited in sequence.

[0053...

Embodiment 1

[0091] (1) According to the chemical formula Mg 2 Al 4 Si 5 o 18 Weigh 50.11g MgCO 3 , 60.6g Al 2 o 3 and 89.28gSiO 2 , mixed to obtain the first mixture; the first mixture, agate balls and deionized water were wet-milled with a planetary mill for 6 hours at a mass ratio of 1:2:2, dried at 150°C, and then dried at 1000°C Pre-fire (in the air atmosphere) for 3 hours, the heating rate is 3°C / min, and cool with the furnace to obtain the MAS pre-fired material.

[0092] (2) According to Li 2 CO 3 : TiO 2 = 1:1 molar ratio weighs 96.09g Li 2 CO 3 and 103.91g TiO 2 , mixed to obtain the second mixture; the second mixture, agate balls and deionized water were wet-milled with a planetary mill for 6 hours at a mass ratio of 1:2:2, dried at 150°C, and dried at 1000°C Pre-fire (in the atmosphere) for 2 hours, the heating rate is 3°C / min, and cool with the furnace to obtain LT pre-fired material.

[0093] (3) Take by weighing 88g MAS calcined material, 12g LT calcined materi...

Embodiment 2

[0100] (1) According to the chemical formula Mg 1.92 Ba 0.08 Al 4 Si 5 o 18 Weigh 47.47g MgCO 3 , 4.63g BaCO 3 , 59.8g Al 2 o 3 and 88.1 g SiO 2 , mixed to obtain the first mixture; the first mixture, agate balls and deionized water were wet-milled with a planetary mill for 6 hours at a mass ratio of 1:2:2, dried at 150°C, and then dried at 1000°C Pre-fire (in the air atmosphere) for 3 hours, the heating rate is 3°C / min, and cool with the furnace to obtain the MAS pre-fired material.

[0101] (2) According to Li 2 CO 3 : TiO 2 = 1:1 molar ratio weighs 96.09g Li 2 CO 3 and 103.91g TiO 2 , mixed to obtain the second mixture; the second mixture, agate balls and deionized water were wet-milled with a planetary mill for 6 hours at a mass ratio of 1:2:2, dried at 150°C, and dried at 1000°C Pre-fire (in the atmosphere) for 2 hours, the heating rate is 3°C / min, and cool with the furnace to obtain LT pre-fired material.

[0102] (3) Take by weighing 88g MAS calcined mat...

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Abstract

The invention provides an MAS-LT composite microwave dielectric ceramic, which has a general formula shown in the following formula: Mg2-xBaxAl4Si5O18-Li2TiO3; wherein x = 0 ~ 0.16; the MAS-LT composite microwave dielectric ceramic contains 6-24% of Li2TiO3 by mass. Compared with the prior art, the MAS-LT composite microwave dielectric ceramic takes a composite oxide with the specific general formula as a main material, and can realize the dielectric constant between 4 and 6 and the continuous adjustment of the frequency temperature coefficient by adjusting the content of the Li2TiO3. Moreover, the MAS-LT composite microwave dielectric ceramic has a stable structure, a specific dielectric constant and a higher Q * f value, and the resonant frequency temperature coefficient is continuouslyadjustable. Experimental results show that the dielectric constant of the MAS-LT composite microwave dielectric ceramic is 4-5.8, the Q * f is more than or equal to 35,800 GHz, and the dielectric constant can reach 87,600 GHz. Compared with other microwave dielectric ceramics with the same dielectric constant, the system has high Q * f value and low dielectric loss; at the same time, the resonantfrequency temperature coefficient is continuously adjustable between -12 ppm / DEG C to +13 ppm / DEG C, the sintering temperature is as low as 950 DEG C, and the formula can be flexibly adjusted.

Description

technical field [0001] The invention relates to the technical field of microwave dielectric ceramics, and more specifically relates to a MAS-LT composite microwave dielectric ceramic and a preparation method thereof. Background technique [0002] Facing the future, mobile communication technology and industry will enter the development stage of the fifth generation mobile communication (5G). 5G will meet people's needs for ultra-high traffic density, ultra-high connection density, and ultra-high mobility. It will penetrate into the Internet of Things and other fields, and will be deeply integrated with industrial facilities, medical instruments, and vehicles to fully realize the "Internet of Everything". Effectively meet the information service needs of vertical industries such as industry, medical care, and transportation. The frequency bands for 5G deployment around the world mainly include Sub-6 and millimeter wave. Millimeter waves with shorter wavelengths are favored ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/195C04B35/622C04B35/64
CPCC04B35/195C04B35/622C04B35/64C04B2235/3234C04B2235/3203C04B2235/3206C04B2235/3215C04B2235/3409C04B2235/3418C04B2235/3284C04B2235/3298C04B2235/6562C04B2235/6567C04B2235/96
Inventor 殷旺曹顺顺陈海马才兵
Owner GUANGDONG GOVA ADVANCED MATERIAL TECH
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