Silicon carbide foamed ceramics and preparation method thereof

A foamed ceramic and silicon carbide technology, which is applied in the field of functional materials and their preparation, can solve the problems of the limitation of the wide application of silicon carbide foamed ceramics, the difficulty in controlling the pore volume and size, and the incompactness of the foamed ceramics, and achieves low cost and high yield. , easy to formulate effect

Inactive Publication Date: 2013-04-03
GUIZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the first three methods do not have a hot pressing process, the initial density is not high, the prepared foamed ceramics are not dense, the strength is low, and the pore volume and size of the solid-state reaction sintering met

Method used

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  • Silicon carbide foamed ceramics and preparation method thereof

Examples

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Comparison scheme
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Example Embodiment

[0017] Embodiment 1 of the present invention: silicon carbide foam ceramics, calculated in parts by weight, its material includes 90 parts of silicon carbide micropowder particles with an average particle size of 0.3 μm (using commercially available β-SiC model products), and 10 parts of poly Carbosilane powder, 40 parts of tetrahydrofuran; its template is polyurethane sponge.

[0018] The method for preparing silicon carbide foam ceramics is to add silicon carbide micropowder particles and polycarbosilane powder to tetrahydrofuran and mix them, and stir thoroughly to obtain an organic solvent slurry; cut the polyurethane sponge into the required shape and size, and then extrude it. After pressing and expelling the air, place it in the organic solvent slurry, let it stretch freely and continuously stir, squeeze and knead, so that the organic solvent slurry is evenly coated on the polyurethane sponge, and the excess organic solvent slurry on the polyurethane sponge is removed to ma...

Example Embodiment

[0019] Example 2 of the present invention: silicon carbide foam ceramic, calculated in parts by weight, its material includes 85 parts of silicon carbide micropowder particles with an average particle size of 0.3 μm (using commercially available β-SiC model products), 15 parts of poly Carbosilane powder, 40 parts of tetrahydrofuran; its template is polyurethane sponge.

[0020] The method for preparing silicon carbide foam ceramics is to add solid silicon carbide micropowder particles and solid polycarbosilane powder to tetrahydrofuran for mixing, and stir thoroughly to obtain an organic solvent slurry; after cutting the polyurethane sponge into the required shape and size, After squeezing out the air, it is placed in the organic solvent slurry, allowed to stretch freely and continuously stirred, squeezed and kneaded, so that the organic solvent slurry is evenly coated on the polyurethane sponge, and the excess organic solvent slurry on the polyurethane sponge is removed. Prepare...

Example Embodiment

[0021] Embodiment 3 of the present invention: silicon carbide foam ceramics, calculated in parts by weight, its material includes 95 parts of silicon carbide micropowder particles with an average particle size of 5 μm (using commercially available β-SiC model products), and 20 parts of polycarbonate Silane powder, 170 parts of tetrahydrofuran; its template is polyurethane sponge.

[0022] The method for preparing silicon carbide foam ceramics is to add silicon carbide micropowder particles and polycarbosilane powder to tetrahydrofuran and mix them, and stir thoroughly to obtain an organic solvent slurry; cut the polyurethane sponge into the required shape and size, and then extrude it. After pressing and expelling the air, place it in the organic solvent slurry, let it stretch freely and continuously stir, squeeze and knead, so that the organic solvent slurry is evenly coated on the polyurethane sponge, and the excess organic solvent slurry on the polyurethane sponge is removed to...

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Abstract

The invention discloses silicon carbide foamed ceramics which comprises the following raw materials in parts by weight: 80-95 parts of silicon carbide micro powder particles, 5-20 parts of polycarbosilane powder and 40-170 parts of organic solvent. A template of the silicon carbide foamed ceramics is made of polymeric sponge. According to the invention, by using the characteristic that the polycarbosilane can be dissolved in the organic solvent, the polycarbosilane and ceramic powder are made into organic solvent slurry, polyurethane foam is dipped in the organic solvent slurry through adopting a powder sintering process principle, and thermally oxidized so that the yield of polycarbosilane ceramics is increased, the silicon carbide foamed ceramics is prepared through sintering under an inert atmosphere. A preparation method has the advantages of low sintering temperature, high efficiency and high production purity, and effectively avoids the difficulties of complex procedures, too many introduced impurities and high sintering temperature of the traditional preparation method for preparing the silicon carbide foamed ceramics.

Description

technical field [0001] The invention relates to a functional material and a preparation method thereof, in particular to a silicon carbide foamed ceramic. Background technique [0002] As a new type of functional material, silicon carbide foam ceramics has light weight, high dielectric constant, large specific surface area, excellent chemical resistance, and can be used for a long time in harsh environments. It is widely used in aerospace, electronics, biomedicine, metallurgy , composite materials and other fields have broad application prospects. [0003] At present, silicon carbide foam ceramics are prepared by the following four methods: powder sintering method, solid state reaction sintering method, silicon resin pyrolysis method and vapor deposition method. The powder sintering method is to adjust the silicon carbide micropowder containing a certain amount of sintering aid and the linking agent into a slurry with a suitable concentration, then use polyurethane foam to ...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B35/565C04B35/622
Inventor 黎阳刘卫陈璐
Owner GUIZHOU NORMAL UNIVERSITY
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