Microwave ceramic and preparation method thereof

A technology of microwave ceramics and ceramic powder, which is applied in the field of microwave ceramic materials, can solve the problems of low dielectric loss and less research on the temperature coefficient of diversified frequencies, and achieve the requirements of wide temperature coefficient range, high Qf value, and low loss. Effect

Active Publication Date: 2021-06-01
南宁国人射频通信有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, low dielectric constant ceramic materials are an indispensable part of the development of filters towards miniaturization. Traditional low dielectric constant microwave ceramic materials do not have high requirements for their d

Method used

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  • Microwave ceramic and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The concrete steps of this embodiment are as follows:

[0018] (1) Preparation of composite powder: Molar ratio [0.85]: [0.85-0*0.85]: [0*0.85]: [2*0.85]: [1-0.85]: [1-0.85] ratio respectively Weigh CaCO with a purity above 99.5% 3 , MgO, ZnO, SiO 2 , SrCO 3 、TiO 2 The powder is ball-milled in a high-speed ball mill and fully mixed, then taken out, dried, ground, and pre-calcined at a high temperature to obtain (CaMgSi 2 o 6 ) 0.85 -(SrTiO 3 ) 0.15 For the composite powder, the calcining temperature is 900° C., and the calcining time is 3 hours.

[0019] (2) Prepare ceramic powder: add 0.1% by weight (ie 0.1wt%) metal oxide Al to the composite powder 2 o 3 , secondary ball milling in a high-speed ball mill, adding 20% ​​(ie 20wt%) binder of the weight of the composite powder and then granulating to obtain ceramic powder. The composition of the ceramic powder is (CaMgSi 2 o 6 ) 0.85 -(SrTiO 3 ) 0.15 +0.1wt%Al 2 o 3 . The bonding agent is polyvinyl alco...

Embodiment 2

[0023] The concrete steps of this embodiment are as follows:

[0024] (1) Preparation of composite powder: Molar ratio [0.85]: [0.85-0.1*0.85]: [0.1*0.85]: [2*0.85]: [1-0.85]: [1-0.85] ratio respectively Weigh CaCO with a purity above 99.5% 3 , MgO, ZnO, SiO 2 , SrCO 3 、TiO 2 The powder is ball-milled in a high-speed ball mill and fully mixed, then taken out, dried, ground, and pre-calcined at a high temperature to obtain (CaMg 0.9 Zn 0.1 Si 2 o 6 ) 0.85 -(SrTiO 3 ) 0.15 For the composite powder, the calcining temperature is 920° C., and the calcining time is 3.2 hours.

[0025] (2) Prepare ceramic powder: add 0.1% by weight (ie 0.1wt%) metal oxide Al to the composite powder 2 o 3 , second ball milling in a high-speed ball mill, adding 22% of the binder of the composite powder weight and then granulating to obtain ceramic powder. The composition of the ceramic powder is (CaMg 0.9 Zn 0.1 Si 2 o 6 ) 0.85 -(SrTiO 3 ) 0.15 +0.1wt.%Al 2 o 3 . The bonding agen...

Embodiment 3

[0029] The concrete steps of this embodiment are as follows:

[0030] (1) Preparation of composite powder: Molar ratio [0.85]: [0.85-0.05*0.85]: [0.05*0.85]: [2*0.85]: [1-0.85]: [1-0.85] ratio respectively Weigh CaCO with a purity above 99.5% 3 , MgO, ZnO, SiO 2 , SrCO 3 、TiO 2 The powder is ball-milled in a high-speed ball mill and fully mixed, then taken out, dried, ground, and pre-calcined at a high temperature to obtain (CaMg 0.95 Zn 0.05 Si 2 o 6 ) 0.85 -(SrTiO 3 ) 0.15 For the composite powder, the calcining temperature is 950° C., and the calcining time is 3.5 hours.

[0031] (2) Prepare ceramic powder: add 0.1% by weight (ie 0.1wt%) metal oxide Al to the composite powder 2 o 3 , secondary ball milling in a high-speed ball mill, adding 25% binder of composite powder weight and then granulating to obtain ceramic powder. The composition of the ceramic powder is (CaMg 0.95 Zn 0.05 Si 2 o 6 ) 0.85 -(SrTiO 3 ) 0.15 +0.1wt.%Al 2 o 3 . The bonding agent ...

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Abstract

The invention provides microwave ceramic and a preparation method thereof. The microwave ceramic comprises the following components in parts by weight: 100 parts of silicate titanate complex and 0.1-0.4 part of a metal oxide, the silicate titanate complex is (CaMg < 1-x > Zn < x > Si<2>O<6>) < y >-(SrTiO<3>) < 1-y >; the metal oxide is Al2O3 and/or CaO; wherein 0 < = x < = 0.1, and 0.8 < = y < = 0.9. Compared with the traditional microwave ceramic, the microwave ceramic disclosed by the invention can obtain better microwave dielectric property and higher Qf value, so that the loss is lower, the temperature coefficient of resonance frequency can be adjusted as required, the preparation process is simple, and large-scale mass production can be realized.

Description

【Technical field】 [0001] The invention relates to the technical field of microwave ceramic materials, in particular to a microwave ceramic and a preparation method thereof. 【Background technique】 [0002] Ceramic dielectric filters are composed of microwave dielectric ceramic materials. As a key material in modern communications, microwave dielectric ceramics can be used as dielectric materials in microwave frequency band circuits and can perform one or more functions. The main performance parameters of microwave dielectric ceramics are: dielectric constant ε r , quality factor Qf and resonant frequency temperature coefficient τ f . Among them, the quality factor corresponds to the dielectric loss of the material, and the temperature coefficient of the resonant frequency is the temperature stability of the resonant frequency. With the rapid development of communication technology brought about by the development of science and technology in the 5G era, the requirements fo...

Claims

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Application Information

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IPC IPC(8): C04B35/22C04B35/622
CPCC04B35/22C04B35/622C04B2235/3206C04B2235/3284C04B2235/3213C04B2235/3236C04B2235/602C04B2235/6567
Inventor 周星星吴成旺陈明贵段宗金郑酬
Owner 南宁国人射频通信有限公司
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