Aluminum oxide microwave dielectric ceramic and preparation method thereof

A technology of microwave dielectric ceramics and alumina, which is applied in the field of inorganic non-metallic functional materials, can solve the problems of inability to obtain high microwave dielectric properties and high withstand voltage properties of alumina microwave dielectric ceramics, and achieve improved density, high microwave Dielectric properties, effect of reducing porosity

Inactive Publication Date: 2016-09-21
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0008] Aiming at the above-mentioned defects, the present invention provides an alumina microwave dielectric ceramic and its preparation method, aiming at solving the problem of the i

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  • Aluminum oxide microwave dielectric ceramic and preparation method thereof
  • Aluminum oxide microwave dielectric ceramic and preparation method thereof

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[0026] The method for preparing the above-mentioned alumina microwave dielectric ceramics provided in the embodiments of the present invention includes such process steps as preparation of CMS mixture, mixing and ball milling, granulation, tableting, debinding and sintering, etc. By adding CMS mixture as a sintering aid, the ceramic The temperature is lowered below 1650°C to increase the density of ceramics, and the combination of CMS mixture and Y 2 o 3 with ZrO 2 , reducing the influence of the CMS mixture on the deterioration of the microwave dielectric properties of the ceramics, improving the density of the alumina ceramics to a large extent, reducing the porosity, and improving the microwave dielectric properties of the alumina microwave dielectric ceramics; at the same time, the alumina ceramics ZrO 2 , can inhibit the excessive growth of grains, refine the grains, and improve the density of ceramics. But due to ZrO 2 At a high temperature of 1200°C, a structural ph...

Embodiment 1～9

[0033] Select Al with a particle size of 1-2 μm 2 o 3 The powder is a raw material; the mass percentage is 69.5% CaCO 3 , 12.9% by mass of MgO, 17.6% by mass of SiO 2 After ball milling and mixing, the mixture was calcined at 900 °C for 2 h to obtain the CMS mixture powder; the Al 2 o 3 The mass percentage of the powder is fixed at 98%, and the Y 2 o 3 The mass percentage of the powder is fixed at 0.25%, and the rest is ZrO 2 and CMS mixture, when ZrO 2 When the mass percentage of ZrO is 0%, the mass percentage of CMS mixture is 1.75%, when ZrO 2 When the mass percentage of the CMS mixture is 0.25%, the mass percentage of the CMS mixture is 1.5%, when the ZrO 2 When the mass percent of Al is 0.5%, the mass percent of CMS mixture is 1.25%, as shown in Table 1, corresponding to implementing 1~3 respectively, according to proportioning Al 2 o 3 , Y 2 o 3 , ZrO 2 After mixing with the CMS mixture, add deionized water ball mill for 6 hours and then dry; add polyvinyl a...

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Abstract

The invention discloses an aluminum oxide microwave dielectric ceramic and a preparation method thereof. The aluminum oxide microwave dielectric ceramic comprises aluminum oxide, yttrium oxide, zirconium oxide and a CMS mixture, wherein the mass percent of aluminum oxide is 95%-98%, the mass percent of yttrium oxide is 0.25%-0.75%, the mass percent of zirconium oxide is 0%-3%, and the mass percent of the CMS mixture is 1.25%-3.25%; the CMS mixture comprises magnesium oxide, calcium oxide and silicon oxide, wherein the mass percent of magnesium oxide is 18.6%, the mass percent of calcium oxide is 50.1%-56.0% and the mass percent of silicon oxide is 25.4%-31.3%. The preparation method comprises: mixing aluminum oxide, yttrium oxide, zirconium oxide and the CMS mixture in proportion, performing ball-milling and pelleting, forming blank pieces by pressing, performing rubber discharging and sintering to prepare the ceramic. By adding the combined oxide, the ceramic is endowed with high microwave dielectric properties and high breakdown strength.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic functional materials, and in particular relates to an alumina microwave dielectric ceramic and a preparation method thereof. Background technique [0002] Alumina ceramics have the characteristics of high mechanical strength, high resistivity, good electrical insulation, high hardness and melting point, good corrosion resistance, and excellent chemical stability. They are widely used in machinery, electronic power, chemical industry, medicine, construction and other industries. high-tech field. Because alumina ceramics have low dielectric constant, low dielectric loss and high thermal conductivity, it is an ideal low dielectric constant microwave dielectric ceramic material, which is used in ceramic substrates packaged in electronic circuits, dielectric resonant antennas and other devices. aspect has important uses. In recent years, microwave dielectric ceramics have become ideal candidate ...

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Application Information

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IPC IPC(8): C04B35/10C04B35/622C04B35/64
CPCC04B35/10C04B35/622C04B35/64C04B2235/3206C04B2235/3208C04B2235/3225C04B2235/3244C04B2235/3418C04B2235/656C04B2235/77C04B2235/96
Inventor 范桂芬王凯吕文中史玉升李晨辉雷文梁飞周静怡
Owner HUAZHONG UNIV OF SCI & TECH
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