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Method for preparing cordierite-based microwave dielectric ceramic material

A technology of microwave dielectric ceramics and manufacturing methods, which is applied in the field of special ceramic materials, and can solve problems such as low linear expansion coefficient of cordierite ceramic blanks, insufficient ionic structure, and narrow firing temperature range, so as to reduce material consumption and shorten heating time , The effect of small dielectric loss

Inactive Publication Date: 2012-10-10
湖南嘉盛电陶新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ionic structure of cordierite material is not compact enough, and there are large gaps in the crystal lattice, so the material is difficult to sinter, and the firing temperature range is narrow. Bluestone-based ceramics have always been a "forbidden zone" in China

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment one, composition by weight ratio: cordierite: 55kg, petalite: 13kg, Si0 2 : 22kg, ZrO 2 : 10kg, PVA: 3kg;

[0022] Grind according to the weight ratio of ball: material: water = 1.6:1.0:1.2. The slurry is passed through a 250-mesh sieve, and the sieve residue is less than 0.1%. The slurry is fired at 1380°C after iron absorption, spray drying, molding, and glazing. , heat preservation for 30 minutes, the water absorption rate of the made ceramic plate is 0.15%, the modulus of rupture: 74.3MPa, and the thermal shock resistance is 380 ℃ ~ 20 ℃ without cracking once.

Embodiment 2

[0023] Embodiment two, composition by weight ratio: cordierite: 66kg, petalite: 15kg, Si0 2 : 10kg, ZrO 2 : 9kg, PVA: 3kg;

[0024] Grind according to the weight ratio of ball: material: water = 1.6:1.0:1.2. The slurry is passed through a 250-mesh sieve, and the sieve residue is less than 0.1%. The slurry is fired at 1380°C after iron absorption, spray drying, molding, and glazing. , heat preservation for 30 minutes, the water absorption rate of the made ceramic plate is 0.09%, the modulus of rupture: 80.5MPa, and the thermal shock resistance is 380℃~20℃ without cracking once.

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PUM

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Abstract

The invention relates to a method for preparing a cordierite-based microwave dielectric ceramic material, which comprises the following steps of: 1, preparing the following raw materials in part by weight: 50 to 70 parts of cordierite, 12 to 25 parts of petalite, 10 to 28 parts of SiO2, 5 to 15 parts of ZrO2 and 1.5 to 3 parts of polyvinyl alcohol (PVA) serving as an additive; 2, ball-milling andgrinding all the powder raw materials; 3, sieving, absorbing iron, spray-drying and pulverizing; and 4, performing mechanical pressing forming, firing at a high temperature, glazing, and preserving the heat to obtain a product. The cordierite-based microwave dielectric ceramic material takes a cordierite crystal phase as a base material, is white and flaky and has the water absorption rate of less than 0.5 percent and the rupture modulus of 65 to 80MPa; the material has thermal shock resistance, namely the material does not crack once in the heat exchange process from 380 to 20 DEG C through an experiment by a strip sample experimental method (YB4018); the material has high wave-transmitting capacity when used in a microwave oven, and the dielectric loss of the material is 25 to 35 percent lower than that of a microcrystalline glass product; and the energy efficiency grade of a microwave oven product can be improved.

Description

technical field [0001] The invention relates to the field of special ceramic materials, namely a method for manufacturing cordierite-based microwave dielectric ceramic materials. Background technique [0002] Microwave dielectric ceramics refer to ceramic materials with excellent dielectric properties in the microwave frequency range of 300MHz to 300GHz, which have been widely used in industry and military, and are used in modern communications, mobile phones, microwave oven load boards, etc. , is an emerging special ceramic material in China. [0003] At present, the microwave oven carrier plate has changed from the rotary table type to the fixed type. This method can save the power consumption of the rotary table drive motor and the drive motor, reduce the volume of the microwave oven cavity, and reduce the consumption of production materials. At present, the carrier board of domestic microwave ovens is made of glass-ceramic material. Glass-ceramic has a certain wave-tran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/195C04B35/622
Inventor 施小罗张强李绍江
Owner 湖南嘉盛电陶新材料股份有限公司