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A kind of sic composite coating for porous thermal insulation carbon material and preparation method thereof

A composite coating, carbon material technology, applied in the material field, achieves the effects of simple equipment process, low requirements on the surface of the base material and equipment, and avoiding direct reactions

Active Publication Date: 2021-11-02
湖南金钺新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention provides a SiC composite coating for porous heat-insulating carbon materials and a preparation method thereof. By constructing a carbon sealing layer on the surface of the carbon felt, the problem of the infiltration of subsequent coating materials into the porous carbon felt is effectively solved, avoiding the The direct reaction between the coating material and the carbon felt, the existence of the carbon sealing layer can not only form a pinning interface combination with the porous carbon felt, but also form a firm chemical bond with the SiC transition layer prepared by the brushing reaction, effectively solving the problem of The problem of the combination of coating and porous carbon felt; in addition, through the preparation of anti-oxidation SiC multilayer composite coating, while ensuring the performance of porous thermal insulation carbon materials, it effectively solves the problem of oxidation protection of porous thermal insulation carbon materials, effectively improving High temperature oxidation resistance and service life of materials

Method used

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  • A kind of sic composite coating for porous thermal insulation carbon material and preparation method thereof
  • A kind of sic composite coating for porous thermal insulation carbon material and preparation method thereof
  • A kind of sic composite coating for porous thermal insulation carbon material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] S1: First set the density to 0.20g / cm 3 The porous carbon felt was cut into small pieces, ultrasonically cleaned, and dried for later use. Dissolve 4g of carbon black and 16g of phenolic resin in 40ml of absolute ethanol, ultrasonically disperse for 10min, and magnetically stir for 30min to obtain a carbon black solution with uniform composition. The average particle diameter of the carbon black used was 24 nm. Brush the mixed solution evenly on the surface of the carbon felt, cure at 120°C for 2 hours, repeat the brushing for 6 times, cure and dry, put the sample into a high-temperature furnace, and pass in argon as a protective gas at a rate of 5°C / min Raise the temperature to 1000°C, keep it warm for 1 hour, and carry out carbonization treatment to prepare a pure carbon sealing layer on the surface of the carbon felt.

[0046]S2: Ultrasonic cleaning is performed on the carbon felt sample prepared with a carbon sealing layer for 30 minutes, and dried at 70°C for lat...

Embodiment 2

[0053] The preparation process is basically the same as that of Example 1, except that in S2, the amount of silicon powder is 2g.

[0054] The prepared SiC composite coating was tested for atmospheric oxidation resistance at 800°C. The results showed that after 65 minutes of atmospheric oxidation at 800°C, the weight loss rate of the porous carbon felt sample with SiC composite coating was 12.8%. After the felt sample was oxidized in the atmosphere at 800°C for 25 minutes, the weight loss rate of the porous carbon felt sample reached 40%, which further shows that the SiC composite coating can play a more obvious anti-oxidation protection effect on the porous carbon felt.

Embodiment 3

[0056] The preparation process is basically the same as in Example 1, except that in S2, the amount of silicon powder is 2.5g.

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Abstract

The invention provides a SiC composite coating for a porous heat-insulating carbon material and a preparation method thereof. The coating sequentially includes a carbon sealing layer, a SiC transition layer prepared by brushing reaction and a SiC prepared by chemical vapor deposition method from the inside to the outside. outer coating. While ensuring the performance of the porous heat-insulating carbon material, the invention effectively solves the oxidation protection problem of the porous heat-insulating carbon material, and can effectively improve the high-temperature oxidation resistance performance of the material. The structure of the carbon sealing layer can effectively prevent the infiltration of coating materials into the porous carbon felt body. It can not only form a pinning interface combination with the porous carbon felt, but also form a strong chemical bond with the SiC transition layer prepared by the brushing reaction. , improve the bonding ability of coating and porous carbon felt. In addition, the coating preparation process of the present invention has low requirements on the surface of the substrate material and equipment, and is not limited by the shape and size of the substrate. Industrial application prospects.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a SiC composite coating for a porous heat-insulating carbon material and a preparation method thereof. Background technique [0002] The energy problem has become a major problem that plagues social and economic development. While developing various new energy sources, people are also committed to developing various new heat insulation and energy-saving materials to achieve energy saving. Carbon felt has light weight, low thermal conductivity, small specific heat capacity, low thermal expansion coefficient, excellent high temperature stability, and because it contains a large number of pores inside, it has excellent thermal insulation performance, and has been widely used as thermal insulation material monocrystalline silicon furnace. Although the porous structure of carbon felt has excellent heat insulation effect, the easy oxidation of carbon materials affects the service l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/622
CPCC04B35/565C04B35/62222C04B2235/5248C04B2235/614
Inventor 杨鑫王友芳黄启忠张明瑜苏哲安
Owner 湖南金钺新材料有限责任公司
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