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Microwave dielectric ceramic with medium dielectric constant, high quality factor and near-zero tau f and preparation method thereof

A microwave dielectric ceramic, high-quality technology, applied in the field of microwave dielectric ceramic materials, can solve the problems that the quality factor cannot be improved at the same time, the temperature coefficient of resonance frequency is close to zero, etc., and achieve the effect of low production cost, good performance, and simple preparation method

Active Publication Date: 2018-05-22
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Aiming at the above defects or improvement needs of the prior art, the present invention provides an intermediary high-quality τ f Near-zero microwave dielectric ceramics and its preparation method, thereby solving the technical problems in the prior art that the quality factor cannot be simultaneously improved and the temperature coefficient of the resonance frequency is near zero

Method used

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  • Microwave dielectric ceramic with medium dielectric constant, high quality factor and near-zero tau f and preparation method thereof
  • Microwave dielectric ceramic with medium dielectric constant, high quality factor and near-zero tau f and preparation method thereof

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preparation example Construction

[0032] An intermediary high-quality τ f The preparation method of near-zero microwave dielectric ceramics, including:

[0033] (1) TiO 2 , (Mg 1 / 3 Sb 2 / 3 )O 2 and ZrO 2 According to (ZrTi) 1-x (Mg 1 / 3 Sb 2 / 3 ) 2x o 4 The ratio is mixed to obtain the mixed raw material, wherein, 0.10≤x≤0.36;

[0034] (2) Carry out wet ball milling for the first time, drying for the first time, pre-calcination, wet ball milling for the second time and drying for the second time successively to the mixed raw materials to obtain the first mixture, wherein the pre-calcination temperature is 1000 ℃~1200℃, pre-burning time is 1h~3h;

[0035] (3) After adding a binder to the first mixture, press it with a powder tablet press to obtain a green body, and sinter the green body at 1360° C. to 1400° C. for 2 hours to 4 hours to obtain a microwave dielectric ceramic.

[0036] The molding pressure of the powder tablet press is 50MPa-100MPa, the binder is polyvinyl alcohol with a mass fraction of ...

Embodiment 1

[0038] An intermediary high-quality τ f The preparation method of near-zero microwave dielectric ceramics, including:

[0039] (1) TiO 2 , (Mg 1 / 3 Sb 2 / 3 )O 2 and ZrO 2 According to (ZrTi) 0.96 (Mg 1 / 3 Sb 2 / 3 ) 0.08 o 4 The ratio is mixed to obtain the mixed raw material,

[0040] (2) Carry out wet ball milling for the first time, drying for the first time, pre-calcination, wet ball milling for the second time and drying for the second time to the mixed raw materials successively to obtain the first mixture, wherein the pre-calcination temperature is 1100 ℃, the pre-burning time is 2h;

[0041] (3) After adding a binder to the first mixture, press it with a powder tablet press to obtain a green body, and sinter the green body at 1280° C. for 4 hours to obtain a microwave dielectric ceramic.

[0042] The molding pressure of the powder tablet press is 50 MPa, the binder is polyvinyl alcohol with a mass fraction of 8%, and the binder is 5% of the mass of the first mix...

Embodiment 2

[0044] An intermediary high-quality τ f The preparation method of near-zero microwave dielectric ceramics, including:

[0045] (1) TiO 2 , (Mg 1 / 3 Sb 2 / 3 )O 2 and ZrO 2 According to (ZrTi) 0.90 (Mg 1 / 3 Sb 2 / 3 ) 0.20 o 4 The ratio is mixed to obtain the mixed raw material,

[0046] (2) Carry out wet ball milling for the first time, drying for the first time, pre-calcination, wet ball milling for the second time and drying for the second time successively to the mixed raw materials to obtain the first mixture, wherein the pre-calcination temperature is 1000 ℃, the pre-burning time is 3h;

[0047] (3) After adding a binder to the first mixture, press it with a powder tablet press to obtain a green body, and sinter the green body at 1360° C. for 3 hours to obtain a microwave dielectric ceramic.

[0048] The molding pressure of the powder tablet press is 80 MPa, the binder is polyvinyl alcohol with a mass fraction of 10%, and the binder is 5.5% of the mass of the first ...

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Abstract

The invention discloses microwave dielectric ceramic with a medium dielectric constant, a high quality factor and a near-zero tau f and a preparation method thereof. The microwave dielectric ceramic comprises a main crystal phase, and the chemical formula of the main crystal phase is (ZrTi)1-x(Mg1 / 3Sb2 / 3)2xO4, wherein x is greater than or equal to 0.10 and less than or equal to 0.36. The dielectric constant of the microwave dielectric ceramic prepared by the preparation method is 24.4-35.4, the temperature coefficient of the resonance frequency is -4.6ppm / DEG C-+6.7ppm / DEG C, and the quality factor is 28000-40200GHz. The microwave dielectric ceramic has an medium dielectric constant, a high quality factor and a near-zero temperature coefficient of resonance frequency.

Description

technical field [0001] The invention belongs to the field of microwave dielectric ceramic materials, and more specifically relates to a medium high-quality τ f Near-zero microwave dielectric ceramics and preparation methods thereof. Background technique [0002] Microwave technology is one of the major achievements of modern scientific development. Because microwave has the advantages of short wavelength and high frequency, it has good frequency selection characteristics, and is widely used in radar and other detection equipment for positioning and tracking targets. Since the beginning of the 21st century, electronic systems have been widely used, and the establishment of 5G networks has enabled microwave technology to develop more vigorously. Driven by this technical background, there is an urgent need for microwave dielectric ceramics with low dielectric loss and near zero resonant frequency temperature coefficient. As a key material for mobile communication base statio...

Claims

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Application Information

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IPC IPC(8): C04B35/49C04B35/622
CPCC04B35/49C04B35/622C04B2235/3206C04B2235/3294C04B2235/656C04B2235/96
Inventor 傅邱云施浩周东祥郑志平罗为
Owner HUAZHONG UNIV OF SCI & TECH
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