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Binary nanometer cooperative reinforcing and toughening silicon carbide ceramics and preparing method thereof

A technology of tough silicon carbide and silicon carbide, which is applied in the field of nano-particles, nano-whisker binary synergistically strengthened and toughened silicon carbide ceramics and its preparation, can solve the problems of unfavorable industrial production, complex process and high cost, and achieve low cost, The process is simple and the effect of inhibiting grain growth

Inactive Publication Date: 2009-10-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, in order to suppress the growth of nanocrystalline grains, hot pressing sintering or hot isostatic pressing sintering is usually used, which is complicated in process and high in cost, which is not conducive to industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, a kind of preparation method of dual-nano synergistic strengthening and toughening silicon carbide ceramics, silicon carbide powder, yttrium aluminum garnet, nano-silicon carbide particles, nano-silicon carbide whiskers are prepared in proportion as main raw materials, the main raw materials The formula composition and percentage by weight of the raw materials are: 86% silicon carbide powder, 10% yttrium aluminum garnet, 2% nano-silicon carbide particles and 2% nano-silicon carbide whiskers; the particle size of the silicon carbide powder is 0.5 μm to 2.5 μm, the size of the nano-silicon carbide particles is 20-80 nm, and the diameter of the nano-silicon carbide whiskers is 50-80 nm. Follow the steps in order:

[0029] 1), adding the above-mentioned main raw materials, phenolic resin of 1.0% by weight of main raw materials, polyethylene glycol (PEG) of 0.5% by weight of main raw materials into deionized water, ball milling and mixing for 6 hours, and prepa...

Embodiment 2

[0035] Embodiment 2, a kind of preparation method of binary nano synergistically strengthened and toughened silicon carbide ceramics, silicon carbide powder, yttrium aluminum garnet, nano-titanium nitride particles and nano-silicon nitride whiskers are prepared in proportion as main raw materials, The formula composition and weight percentage of the main raw material are: 83% silicon carbide powder, 10% yttrium aluminum garnet, 2% nano-titanium nitride particles and 5% nano-silicon nitride whiskers; silicon carbide powder The particle size of the nano-titanium nitride is 0.5-2.5 μm, the particle size of the nano-titanium nitride is 20-80 nm, and the diameter of the nano-silicon nitride whisker is 50-80 nm. Follow the steps in order:

[0036]1), add the above-mentioned main raw material, phenolic resin of 2.5% by weight of main raw material, polyethylene glycol (PEG) of 1% by weight of main raw material into deionized water, ball mill and mix for 8 hours, and prepare a solid ph...

Embodiment 3

[0042] Embodiment 3, a kind of preparation method of dual-nano synergistically strengthened and toughened silicon carbide ceramics, silicon carbide powder, yttrium aluminum garnet, nano-titanium carbide particles and nano-silicon carbide whiskers are prepared in proportion as main raw materials, the main raw materials The formula composition and weight percent of the raw materials are: 83% silicon carbide powder, 10% yttrium aluminum garnet, 5% nano-titanium carbide particles and 2% nano-silicon carbide whiskers; the particle size of the silicon carbide powder is 0.5 μm to 2.5 μm, the particle size of the nano-titanium carbide is 20-80 nm, and the diameter of the nano-silicon carbide whisker is 50-80 nm. Follow the steps in order:

[0043] 1), adding the above-mentioned main raw materials, polyvinyl alcohol of 0.5% by weight of the main raw materials, and polyethylene glycol (PEG) of 1.0% by weight of the main raw materials into deionized water, ball milling and mixing for 10 ...

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Abstract

The invention discloses a method for preparing binary nanometer cooperative reinforcing and toughening silicon carbide ceramics, and silicon carbide powder, yttrium aluminum garnet, nano particles and nano crystal whickers are taken as the main raw materials. The method comprises the following steps: 1) the main raw materials, a binder and a dispersant are added into de-ionized water, after being ball-milled and mixed, water-base silicon carbide slurry is prepared; 2) the water-base silicon carbide slurry is sprayed and dried by adopting a spray granulation technology; 3) the obtained silicon carbide granulating powder is formed by adopting pre-pressing of dry pressing and final pressing of cold isostatic pressing; and 4) the obtained green body of silicon carbide is put in a vacuum non-pressure sintering furnace to be treated, thus obtaining the binary nanometer cooperative reinforcing and toughening silicon carbide ceramics. The invention also discloses the binary nanometer cooperative reinforcing and toughening silicon carbide ceramics prepared in the method. The silicon carbide ceramics have the advantages of large flexural strength, good fracture toughness and the like.

Description

technical field [0001] The invention relates to a nano particle and nano whisker binary synergistically strengthened and toughened silicon carbide ceramic and a preparation method thereof. Background technique [0002] Silicon carbide ceramics is a high-performance structural material with many excellent properties, such as high mechanical strength, large elastic modulus, high hardness, good wear resistance, high temperature resistance, good thermal shock resistance, strong oxidation resistance, Good thermal stability, high thermal conductivity, good chemical corrosion resistance, etc. Silicon carbide ceramics have been widely used in machinery, electronics, metallurgy, petrochemical and other fields and national defense industry, and have been recognized internationally as the fourth basic material since metal, alumina, and cemented carbide. Although silicon carbide ceramics have many properties, their low room temperature strength, insufficient toughness, and difficulty i...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/565
Inventor 郭兴忠杨辉张玲洁傅晓健
Owner ZHEJIANG UNIV
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