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Multi-scale-structure SiC/C porous composite ceramic and preparation method thereof

A composite ceramic, multi-scale technology, applied in ceramic products, other household appliances, household appliances, etc., can solve the problem of reducing the specific surface area of ​​porous SiC ceramics, and achieve the effect of avoiding the reduction of specific surface area, high specific surface area, and saving operation steps.

Active Publication Date: 2015-08-05
GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of catalyst shaping, the sintering process of porous SiC ceramics will lead to a large decrease in specific surface area

Method used

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  • Multi-scale-structure SiC/C porous composite ceramic and preparation method thereof
  • Multi-scale-structure SiC/C porous composite ceramic and preparation method thereof
  • Multi-scale-structure SiC/C porous composite ceramic and preparation method thereof

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Experimental program
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preparation example Construction

[0029] Concrete preparation process is as follows:

[0030] Step 1: Select a density of 0.2 to 0.6g / cm 3 The polyacrylonitrile-based carbon fiber felt is used as the carbon fiber skeleton; the selected carbon fiber skeleton is put into a hydrothermal reaction kettle, and the sucrose solution is used as the carbon source precursor. Take out the carbon skeleton of the polyacrylonitrile-based carbon fiber felt after one hour, and dry it; wherein, the concentration of the sucrose solution is controlled at 100g-500g / L, and the ratio of the polyacrylonitrile-based carbon fiber felt to the sucrose solution is (1-5)g: (30 ~50) mL.

[0031] Step 2: Combine Si with SiO 2 The mixed powder 3, the carbon fiber skeleton 4 dried in step 1 are added in the graphite crucible 1, and the bottom of the graphite crucible 1 has a vent pipe 2 for passing gas into the crucible and extending into the inside of the crucible, Si and SiO 2 The height of the mixed powder is lower than the height of the...

Embodiment 1

[0035] Step 1: Choose a density of 0.2g / cm 3 The polyacrylonitrile-based carbon fiber felt is used as the carbon fiber skeleton;

[0036] Step 2: Put the carbon fiber skeleton selected in step 1 into a hydrothermal reaction kettle, then add a sucrose solution as a carbon source precursor, deposit the carbon fiber skeleton for 2 hours at a reaction temperature of 180°C, and then dry it; , the concentration of sucrose solution is 100g / L, the ratio of polyacrylonitrile-based carbon fiber felt to sucrose solution is 1g:30mL.

[0037] Step 3: Combine Si with SiO 2 Add the mixed powder and the carbon fiber skeleton dried in step 2 into the graphite crucible, and then put the graphite crucible into the vacuum sintering furnace. When the temperature rises to 1200°C, pass CO gas into the graphite crucible through the graphite ventilation tube for sintering 1 hour, and then naturally cooled to room temperature to obtain multi-scale structure SiC / C porous composite ceramics; wherein, S...

Embodiment 2

[0040] Step 1: Select a density of 0.6g / cm 3 The polyacrylonitrile-based carbon fiber felt is used as the carbon fiber skeleton;

[0041] Step 2: Put the carbon fiber skeleton selected in step 1 into a hydrothermal reaction kettle, then add sucrose solution as a carbon source precursor, deposit the carbon fiber skeleton for 8 hours at a reaction temperature of 250°C, and then take out the carbon fiber skeleton and dry it. Wherein, the concentration of the sucrose solution is 500g / L, and the ratio of the polyacrylonitrile-based carbon fiber felt to the sucrose solution is 2g:45mL.

[0042] Step 3: Combine Si with SiO 2 Add the mixed powder and the carbon fiber skeleton dried in step 2 into the graphite crucible, and then put the graphite crucible into the vacuum sintering furnace. When the temperature rises to 1500°C, pass CO gas into the graphite crucible through the graphite ventilation tube for sintering 3 hours, and then naturally cooled to room temperature to obtain mult...

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Abstract

Disclosed are a multi-scale-structure SiC / C porous composite ceramic and a preparation method thereof. The multi-scale-structure SiC / C porous composite ceramic is obtained by taking a polyacrylonitrile-based carbon fiber felt as a framework, settling carbon layers on the surface of the polyacrylonitrile-based carbon fiber felt and then growing a SiC protecting layer and SiC nanowires inside the framework. According to the multi-scale-structure SiC / C porous composite ceramic and the preparation method thereof, by settling the carbon layers on the surface of carbon fiber through the hydrothermal carbonization technology, the carbon fiber can be connected into a porous carbon framework, so that the strength and the specific surface area of the carbon framework can be improved; then by taking CO as a carbon source and SiO as a silicon source and through a chemical gas-phase reaction method, the SiC layer and the SiC nanowires can be formed inside the carbon frame to structure the SiC / C porous composite ceramic. The multi-scale-structure SiC / C porous composite ceramic has a large specific surface area and has the advantages of being easy to form and high in strength.

Description

technical field [0001] The invention belongs to the technical field of preparation of porous ceramic materials, and relates to a multi-scale structure 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 produc...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/80C04B35/565
Inventor 李翠艳欧阳海波黄剑锋曹丽云费杰孔新刚许占位
Owner GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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