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Microwave silicon carbide ceramics heating element and preparation method thereof

A ceramic heating element and microwave silicon carbide technology, applied in the field of ceramic materials, can solve the problems of insufficient heating speed and energy conversion efficiency, unsatisfactory heating effect, and difficulty in wide application, etc., and achieve good microwave absorption performance, Good practical value, low cost effect

Inactive Publication Date: 2017-07-21
顼吉君
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, most of the microwave heat-absorbing materials are oxides of precious metals such as titanium and beryllium, which are difficult to be widely used in the field of civilian products due to their high preparation costs; although there are also silicon carbide-based materials in the prior art Wave-absorbing and heating structures, but due to the different formulations of each component, the heating effect achieved is not ideal, and there are deficiencies in heating speed and energy conversion efficiency, which is not conducive to popularization

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  • Microwave silicon carbide ceramics heating element and preparation method thereof
  • Microwave silicon carbide ceramics heating element and preparation method thereof

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preparation example Construction

[0027] The preparation process of the ceramic heating element comprises the following steps:

[0028] a. Preparation of wave-absorbing ceramic raw materials: Weigh each component in the wave-absorbing ceramic powder in proportion, and add each component into a Raymond mill to grind and pulverize to 1000 mesh powder, and then add the obtained powder into viscose Put the binder into a centrifugal mixer, stir and mix for 0.5-1 hour, and obtain a uniformly mixed wave-absorbing ceramic raw material;

[0029] b. Pressure molding: Put the wave-absorbing ceramic raw material obtained in step a into a mold and press it directly with a hydraulic press to form it. The molding pressure is 25-50 MPa, and the pressure stabilization time lasts for 1.5-2.5 minutes to obtain a ceramic body;

[0030] c. Stylized drying: the ceramic body obtained in step b is left to stand for not less than 24 hours to solidify and form, and then microwave drying is used after standing, and the drying environmen...

Embodiment 1

[0033] Weigh the components in the microwave-absorbing ceramic powder in proportion: 73wt% of silicon carbide, 1wt% of aluminum oxide, 1wt% of zirconia, 20wt% of ferric oxide, 1wt% of hafnium dioxide, 1wt% of silicon dioxide, three Diyttrium oxide 1wt%, lanthanum trioxide 2wt%, the above components are added to a Raymond mill, ground and pulverized to a 1000 mesh powder, and then the obtained powder is added to a binder that is a high temperature resistant glue. The addition amount is 6wt% of the wave-absorbing ceramic powder, put into a centrifugal mixer, stir and mix for 1 hour, and prepare the wave-absorbing ceramic raw material. The obtained wave-absorbing ceramic raw material is pressed into a mold and pressurized by a hydraulic press to obtain a ceramic green body. The molding pressure is 25 MPa, and the pressure stabilization time lasts for 2 minutes. Then the obtained ceramic green body is left to stand and solidified for not less than 24 hours, microwave-dried at 90° ...

Embodiment 2

[0035]Weigh the components in the microwave-absorbing ceramic powder in proportion: 70wt% silicon carbide, 2wt% aluminum oxide, 2wt% zirconia, 21wt% ferric oxide, 1wt% hafnium dioxide, 1wt% silicon dioxide, three Diyttrium oxide 1wt%, lanthanum trioxide 2wt%, the above-mentioned components are ground and pulverized into a 1000-mesh powder in a Raymond mill, and then the obtained powder is added to a binder that is a high-temperature-resistant glue. The addition amount is 7wt% of the wave-absorbing ceramic powder, put into a centrifugal mixer, stir and mix for 0.5h, and prepare the wave-absorbing ceramic raw material. The obtained wave-absorbing ceramic raw material is pressed into a mold and pressurized by a hydraulic press to obtain a ceramic green body. The molding pressure is 25 MPa, and the pressure stabilization time lasts for 1.5 minutes. Then the obtained ceramic green body is left to stand and solidified for not less than 24 hours, microwave-dried at 100° C., and coole...

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Abstract

The invention discloses a microwave silicon carbide ceramics heating element and a preparation method thereof, and belongs to the technical field of the ceramic material. The microwave silicon carbide ceramics heating element is formed by sintering after mixing and pressing microwave absorbing ceramic powder and a bonder. The microwave absorbing ceramic powder comprises the following raw materials by weight percentage: 68%-73% of silicon carbide, 1%-5% of aluminum oxide, 1%-6% of zirconium oxide, 18%-23% of ferroferric oxide, 1%-6% of hafnium oxide, 1%-6% of silicon dioxide, 1%-5% of yttria, and 2%-5% of lanthanum trioxide. The ceramics heating element is capable of rapidly warming under the microwave function, and has the characteristics of high thermal efficiency, stable performance, and energy-saving.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a ceramic body capable of rapidly heating under the action of microwaves. Background technique [0002] Microwave absorbing material refers to a functional material that can absorb and attenuate incident electromagnetic waves, and convert electromagnetic waves into heat or other energy. Silicon carbide not only has good microwave absorption characteristics, but also is an important high-temperature structural ceramic material with many excellent properties such as high hardness, high thermal conductivity, corrosion resistance, and good thermal shock resistance. Therefore, silicon carbide fiber has become It is a very promising microwave absorbing and heating material applied in high temperature environment. [0003] In the prior art, most of the microwave heat-absorbing materials are oxides of precious metals such as titanium and beryllium, which are difficult to be wi...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622C04B38/00B28B3/00
CPCB28B3/00C04B35/565C04B35/622C04B38/0003C04B2235/3217C04B2235/3225C04B2235/3227C04B2235/3244C04B2235/3272C04B2235/3418C04B2235/656C04B2235/9607
Inventor 顼吉君
Owner 顼吉君
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