High specific surface area SiC/C porous composite ceramic and preparation method thereof

A high specific surface area, composite ceramic technology, used in ceramic products, other household appliances, applications, etc., can solve the problem of reducing the specific surface area of ​​porous SiC ceramics, and achieve the effects of easy molding, increased specific surface area, and high specific surface area.

Inactive Publication Date: 2013-02-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the process of catalyst shaping, the sintering process of por...

Method used

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  • High specific surface area SiC/C porous composite ceramic and preparation method thereof
  • High specific surface area SiC/C porous composite ceramic and preparation method thereof
  • High specific surface area SiC/C porous composite ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1: Choose a density of 0.2g / cm 3 Chopped carbon fiber preforms serve as skeletons;

[0023] Step 2: Put the carbon fiber skeleton selected in step 1 into a chemical vapor deposition furnace, using natural gas as the carbon source precursor, the deposition temperature is 900°C, the deposition time is 1, and the thickness of the deposited pyrolytic carbon layer is 1 μm.

[0024] Step 3: Put the carbon fiber skeleton treated in step 2 into a microwave hydrothermal reaction apparatus. Using glucose as a carbon source, carbon microspheres were deposited on the surface of carbon fibers. The glucose concentration was controlled at 10g / L, the reaction temperature was controlled at 150°C, the reaction time was controlled at 1h, and the final carbon microsphere size was 200nm.

[0025] Step 4: Put the porous carbon template obtained in Step 3 into a microwave hydrothermal reactor. With Fe (NO 3 ) 3 As a raw material, nano-Fe was introduced into the porous carbon templat...

Embodiment 2

[0029] Step 1: Select a density of 0.6g / cm 3 Chopped carbon fiber preforms serve as skeletons;

[0030] Step 2: Put the carbon fiber skeleton selected in step 1 into a chemical vapor deposition furnace, using propane as the carbon source precursor, the deposition temperature is 1200°C, the deposition time is 4h, and the thickness of the deposited pyrolytic carbon layer is 5 μm.

[0031] Step 3: Put the carbon fiber skeleton treated in step 2 into a microwave hydrothermal reaction apparatus. Using glucose as a carbon source, carbon microspheres were deposited on the surface of carbon fibers. The glucose concentration was controlled at 100g / L, the reaction temperature was controlled at 250°C, the reaction time was controlled at 5h, and the final carbon microsphere size was 500nm.

[0032] Step 4: Put the porous carbon template obtained in Step 3 into a microwave hydrothermal reactor. With Ni (NO 3 ) 2 As a raw material, nano-NiO particles were introduced into the porous car...

Embodiment 3

[0036] Step 1: Choose a density of 0.4g / cm 3 Chopped carbon fiber preforms serve as skeletons;

[0037] Step 2: Put the carbon fiber skeleton selected in step 1 into a chemical vapor deposition furnace, using methane as the carbon source precursor, the deposition temperature is 1100 ° C, the deposition time is 2 h, and the thickness of the deposited pyrolytic carbon layer is 2 μm.

[0038] Step 3: Put the carbon fiber skeleton treated in step 2 into a microwave hydrothermal reaction apparatus. Using glucose as a carbon source, carbon microspheres were deposited on the surface of carbon fibers. The glucose concentration was controlled at 30g / L, the reaction temperature was controlled at 200°C, the reaction time was controlled at 3h, and the final carbon microsphere size was 300nm.

[0039] Step 4: Put the porous carbon template obtained in Step 3 into a microwave hydrothermal reactor. Take Co(NO 3 ) 2 As a raw material, nano-CoO particles were introduced into the porous ca...

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Abstract

The invention provides high specific surface area silicon carbide porous ceramic and a preparation method thereof. According to the method, a micro/nano multi-level structure in the nature is used as thought, the novel SiC/C porous composite ceramic is designed from the perspective of biomimetic material designing, a carbon fiber serves as a framework, SiC microspheres are used for simulating microspikes in a living body, SiC nanowires are used for simulating nanometer villus in the living body, and thereby the biomimetic SiC/C porous composite ceramic is constructed. The SiC/C porous composite ceramic has the advantages of being high in specific surface area and strength and easy to form.

Description

technical field [0001] The invention belongs to the technical field of preparation of porous ceramic materials, and relates to a high specific surface area SiC / C porous composite ceramic and a preparation method thereof. Background technique [0002] SiC is a covalent bond compound composed of carbon and silicon. It has a tetrahedral structural unit similar to diamond. It not only has very good chemical stability, high mechanical strength and hardness, but also has good thermal and electrical conductivity. In particular, the good electrical and thermal conductivity of SiC is beneficial to the heat transfer of the catalyst during the reaction process and the electron transfer between the catalyst active component and the carrier. Silicon carbide becomes an ideal material for the catalyst carrier. However, the application of SiC porous ceramics is rarely seen in the field of chemical catalysis technology. The reason is that the specific surface area of ​​SiC porous ceramics p...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/565C04B35/622C04B38/00
Inventor 欧阳海波李翠艳黄剑锋费杰曹丽云卢靖
Owner SHAANXI UNIV OF SCI & TECH
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