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A kind of silicon carbide composite ceramics

A technology of multiphase ceramics and silicon carbide, applied in the field of composite materials, can solve the problems of low comprehensive mechanical properties of ceramics, reduced strength, uneven composition of reaction sintered silicon carbide, etc.

Active Publication Date: 2021-04-20
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of the above-mentioned second phase often causes uneven composition and reduced strength of the reaction-sintered silicon carbide, and the density of the prepared ceramics is generally lower than 3.10g / cm 3 , the fracture strength is generally between 300 and 450 MPa, so the comprehensive mechanical properties of ceramics are generally relatively low

Method used

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  • A kind of silicon carbide composite ceramics
  • A kind of silicon carbide composite ceramics
  • A kind of silicon carbide composite ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1) Accurately weigh 100g of coarse silicon carbide powder I, 250g of fine silicon carbide powder II, 5g of graphene nanosheets, 88g of charcoal black, 14g of tetramethylammonium hydroxide and 21g of sodium carboxymethylcellulose; The particle size is 20-30μm, the particle size of silicon carbide fine powder II is 3-8μm; the thickness of graphene nanosheet is 50-300nm, and the specific surface area of ​​charcoal black is 10-18m 3 / g;

[0045] 2) Add silicon carbide coarse powder I, silicon carbide fine powder II and sodium carboxymethyl cellulose into the dispersion medium ethanol-deionized water, put them into a planetary ball mill for high-speed ball milling for 6 hours, and obtain a slurry; then pre-dispersed graphite Add ene nanosheets, charcoal black and tetramethylammonium hydroxide to the slurry, and continue high-speed ball milling for 12 hours to obtain a ceramic slurry; wherein, the medium for ball milling is high-hardness silicon carbide balls; the viscosity o...

Embodiment 2

[0051] 1) Accurately weigh 100g of silicon carbide coarse powder I, 220g of silicon carbide fine powder II, 6g of graphene nanosheets, 90g of charcoal black, 13g of polyacrylic acid and 22g of epoxy resin; the particle size of silicon carbide coarse powder I is 20-30μm, The particle size of silicon carbide fine powder II is 3-8μm; the thickness of graphene nanosheets is 50-300nm, and the specific surface area of ​​charcoal black is 10-18m 3 / g;

[0052] 2) Add silicon carbide coarse powder I, silicon carbide fine powder II and epoxy resin into the dispersion medium ethanol-deionized water, put them into a planetary ball mill for high-speed ball milling for 6 hours to obtain a slurry; then pre-dispersed graphene nanosheets 1. Charcoal black and polyacrylic acid are added to the slurry, and the high-speed ball milling is continued for 12 hours to obtain a ceramic slurry; wherein, the medium of the ball milling is a high-hardness silicon carbide ball;

[0053] 3) Inject the unif...

Embodiment 3

[0057] 1) Accurately weigh 100g of silicon carbide coarse powder I, 280g of silicon carbide fine powder II, 4.5g of graphene nanosheets, 84g of charcoal black, 13g of tetramethylammonium hydroxide and 25g of organic silicon; the particle size of silicon carbide coarse powder I is 20-30μm, the particle size of silicon carbide fine powder II is 3-8μm; the thickness of graphene nanosheets is 50-300nm, and the specific surface area of ​​charcoal black is 10-18m 3 / g;

[0058] 2) Add silicon carbide coarse powder I, silicon carbide fine powder II and organic silicon into the dispersion medium ethanol, put them into a planetary ball mill for high-speed ball milling for 5 hours, and obtain a slurry; then pre-dispersed graphene nanosheets, charcoal black Add tetramethylammonium hydroxide to the slurry, and continue high-speed ball milling for 10 hours to obtain a ceramic slurry; wherein, the medium for ball milling is high-hardness silicon carbide balls;

[0059] 3) Inject the unifor...

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Abstract

The invention relates to a composite ceramic, in particular to a graphene-based layered silicon carbide / reaction sintered silicon carbide composite ceramic, which belongs to the technical field of composite materials. A silicon carbide composite ceramic includes the following raw material components: silicon carbide coarse powder I, silicon carbide fine powder II, graphene nanosheets, charcoal black, silicon powder, dispersant, binder; silicon carbide coarse powder I and silicon carbide The mass ratio of fine powder II is 100:200‑300. The bulk density of the silicon carbide composite ceramics of the present invention is >3.1g / cm 3 , flexural strength>480MPa, fracture toughness>5.2MPa m 1 / 2 , Compared with single-reaction silicon carbide ceramics, its mechanical properties are significantly improved.

Description

technical field [0001] The invention relates to a composite ceramic, in particular to a graphene-based layered silicon carbide / reaction sintered silicon carbide composite ceramic, which belongs to the technical field of composite materials. Background technique [0002] Reaction sintered silicon carbide uses silicon carbide and carbon particles as the green body. The silicon is melted under heating conditions. The liquid phase silicon penetrates into the green body under the action of capillary force, and the liquid phase silicon reacts with the carbon particles to form secondary β-SiC particles. The β-SiC particles connect the initial silicon carbide particles in the green body, while the liquid phase silicon fills the remaining pores, resulting in a dense silicon carbide material. The above preparation process endows reaction sintered silicon carbide with advantages such as high density, low sintering temperature, and easy forming of complex shapes. Therefore, reaction sin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/573
Inventor 李双魏春城刘爱菊孟子霖张茜
Owner SHANDONG UNIV OF TECH
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