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Preparation method for densified silicon carbide based composite material

A technology for densifying silicon carbide-based and composite materials, which is applied in the field of material preparation, can solve the problems of poor matching between carbon fibers and silicon carbide substrates, reduced porosity, low-temperature cracks, etc., and achieves convenient structural design and optimization. Uniform, low temperature crack defect reduction effect

Active Publication Date: 2017-01-04
宁波欧翔精细陶瓷技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention: In view of the defect that the matching degree between the carbon fiber and the silicon carbide matrix is ​​not high in the current traditional silicon carbide-based composite materials, resulting in cracks often appearing at low temperature, the present invention uses carbon nanoparticles and silicon micropowder as raw materials, and uses Silicon carbide / carbon composite powder is prepared by mechanochemical effect, and mixed with ethanol solution, tetramethylammonium hydroxide, and carboxymethyl cellulose for ball milling and pulping, and after spray drying, spherical particles are made with alumina, Mix zirconia and place it in a mold, press it into a green body, and evenly spray the glaze slurry prepared by crushing calcium carbonate, cordierite, etc., and mixing it with water on the surface of the green body, dry and calcined to obtain a densified silicon carbide matrix The composite material solves the defect that the traditional silicon carbide composite material is prone to low-temperature cracks, and the glaze slurry penetrates into the pores, reducing the porosity and making the composite material more dense, with excellent use value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] First, weigh 200g of carbon nanoparticles and 280g of silicon micropowder, put them into a vacuum ball mill tank, seal it and pump it until the vacuum degree in the tank is 1Pa, feed argon gas until the pressure in the tank is 0.1MPa, place it on a planetary ball mill, and heat it at 150r / min ball milling for 20 hours to obtain silicon carbide / carbon composite powder; weigh 200g of the above silicon carbide / carbon composite powder, put it into a ball mill jar, add 300mL ethanol solution with a mass fraction of 65%, and 2g tetramethylammonium hydroxide, 6g of carboxymethyl cellulose, stirred evenly to obtain a mixed solution, and filled with 400g of polyurethane steel balls with a diameter of 10mm, placed the ball milling tank in a three-dimensional mixer, and wet ball milled until the viscosity of the mixed solution in the tank was 2000mPa·s. Mixed slurry; put the above mixed slurry into a spray dryer preheated to an inlet temperature of 110°C, continue heating until th...

example 2

[0020]First, weigh 220g of carbon nanoparticles and 290g of silicon micropowder, add them to a vacuum ball mill tank, seal and pump to a vacuum of 5Pa in the tank, and introduce argon until the pressure in the tank is 0.15MPa, place it on a planetary ball mill, and heat it at 170r / min ball milling for 22 hours to obtain silicon carbide / carbon composite powder; weigh 250g of the above silicon carbide / carbon composite powder, put it into a ball mill jar, add 330mL of 65% ethanol solution, 2.5g of tetramethylammonium hydroxide , 8g of carboxymethyl cellulose, stirred evenly to obtain a mixed solution, and filled with 500g of a diameter of 13mm polyurethane steel balls, placed the ball milling tank in a three-dimensional mixer, wet ball milling until the viscosity of the mixed solution in the tank was 2300mPa·s, The mixed slurry was obtained; the above mixed slurry was added to a spray dryer preheated to an inlet temperature of 115°C, continued to be heated until the inlet tempera...

example 3

[0023] First, weigh 240g of carbon nanoparticles and 300g of silicon micropowder, put them into a vacuum ball mill tank, seal and pump until the vacuum degree in the tank is 10Pa, feed argon gas until the pressure in the tank is 0.2MPa, place it on a planetary ball mill, and heat it at 200r / min ball milling for 24 hours to obtain silicon carbide / carbon composite powder; weigh 300g of the above silicon carbide / carbon composite powder, put it into a ball mill jar, add 350mL ethanol solution with a mass fraction of 65%, and 3g tetramethylammonium hydroxide, 9g of carboxymethyl cellulose, stirred evenly to obtain a mixed solution, and filled with 600g of polyurethane steel balls with a diameter of 15mm, placed the ball milling tank in a three-dimensional mixer, and wet ball milled until the viscosity of the mixed solution in the tank was 2500mPa·s. Mixed slurry; put the above mixed slurry into a spray dryer preheated to an inlet temperature of 120°C, continue heating until the inl...

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Abstract

The invention discloses a preparation method for a densified silicon carbide based composite material, and belongs to the technical field of material preparation. The preparation method comprises: by taking carbon nano particles and silica powder as raw materials and due to a mechanical force chemical effect, preparing silicon carbide / carbon composite powder; ball-milling, mixing and pulping the silicon carbide / carbon composite powder, ethanol solution, tetramethylammonium hydroxide, and carboxymethylcellulose, and spraying and drying the mixture, thereby obtaining spherical particles; uniformly mixing the spherical particles with aluminum oxide and zirconium dioxide, putting the mixture in a mould, pressing the mould to form blanks, uniformly spraying glaze slurry prepared by uniformly mixing calcium carbonate powder, cordierite powder and water on the surfaces of the blanks, and drying and burning the treated blanks, thereby obtaining the densified silicon carbide based composite material. Therefore, a defect that the traditional silicon carbide based composite material is easy to generate low-temperature cracks is solved; the glaze slurry permeates into holes, so that the void fraction is reduced; and then the composite material is greatly densified, and an excellent use value is achieved.

Description

technical field [0001] The invention discloses a method for preparing a densified silicon carbide-based composite material, which belongs to the technical field of material preparation. Background technique [0002] With the development of new engines and the development of new concept space vehicles, higher requirements are put forward for high temperature structural materials. Fiber-reinforced ceramic matrix composites have excellent properties such as high strength, high toughness, high temperature resistance, good corrosion resistance and low density at high temperatures, and have broad application prospects in the fields of strategic weapons and space technology. In recent years, more and more By the attention of material workers. In the fields of national defense and aerospace, silicon carbide matrix composites show broad application prospects in new aerospace vehicles and other aspects. In civil fields such as transportation and new energy, nuclear fusion plasma pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/626C04B41/86C03C8/00
CPCC03C8/00C04B35/565C04B35/6261C04B41/5022C04B41/86C04B2235/3217C04B2235/3244C04B2235/3418C04B2235/422C04B2235/77C04B2235/96C04B2235/9607C04B41/4543
Inventor 梅庆波王龙陆娜
Owner 宁波欧翔精细陶瓷技术有限公司