Boride reinforced silicon carbide ceramics and preparation method thereof

A technology of silicon carbide ceramics and borides, which is applied in the field of boride-enhanced silicon carbide ceramics and its preparation, can solve the problems of complex process, high cost, and high sintering temperature, and achieve the effect of simple process, low cost, and low sintering temperature

Inactive Publication Date: 2009-09-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there have been reports on boride-silicon carbide composite ceramics, but the main phases are all borides, such as ZrB 2 - SiC, HfB 2 -SiC, the proportion of silicon carbide is only between 5% and 25%
Moreover, these com...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1. A method for preparing boride-reinforced silicon carbide ceramics. Silicon carbide powder, yttrium aluminum garnet, and zirconium boride micropowder are prepared in proportion as main raw materials. The formula composition and weight percentage of the main raw materials are: 80% silicon carbide powder, 10% yttrium aluminum garnet and 10% zirconium boride powder; the average particle diameters of the silicon carbide powder and zirconium boride powder are 1.7 μm and 0.3 μm respectively; the following steps are carried out in sequence:

[0028] 1), adding the above-mentioned main raw materials, phenolic resin with 0.5% weight of main raw materials, and polyethylene glycol (PEG) with 0.6% weight of main raw materials into deionized water, ball milled and mixed for 8 hours, and prepared to have a solid phase weight content of 60% water-based silicon carbide slurry;

[0029] That is (main raw material)÷(main raw material+phenolic resin+polyethylene glycol+deioni...

Embodiment 2

[0033] Embodiment 2. A method for preparing boride-reinforced silicon carbide ceramics. Silicon carbide powder, yttrium aluminum garnet, and hafnium boride micropowder are prepared in proportion as main raw materials. The formula composition and weight percentage of the main raw materials are: 85% silicon carbide powder, 10% yttrium aluminum garnet and 5% hafnium boride powder; the average particle diameters of the silicon carbide powder and hafnium boride powder are 2.1 μm and 0.5 μm respectively; the following steps are carried out in sequence:

[0034] 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 phase weight content of 40% water-based silicon carbide slurry;

[0035] That is (main raw material)÷(main raw material+phenolic resin+polyethylene glycol+deionized water)=40% (weight ratio)....

Embodiment 3

[0039] Embodiment 3. A method for preparing boride-reinforced silicon carbide ceramics. Silicon carbide powder, yttrium aluminum garnet, and titanium boride micropowder are prepared in proportion as main raw materials. The formula composition and weight percentage of the main raw materials are: 78% of silicon carbide powder, 14% of yttrium aluminum garnet and 8% of titanium boride powder; the average particle diameters of the silicon carbide powder and titanium boride powder are respectively 0.8 μm and 0.2 μm; the following steps are carried out in sequence:

[0040] 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 0.6% by weight of the main raw materials into deionized water, ball milling and mixing for 18 hours, and preparing a solid phase weight content of 30 % of water-based silicon carbide slurry;

[0041] That is (main raw material)÷(main raw material+polyvinyl alcohol+polye...

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Abstract

The invention discloses a preparation method of boride reinforced silicon carbide ceramics, taking silicon carbide powder, yttrium aluminum garnet and boride micro-powder as main raw materials and comprising the following steps: 1. adding the main raw materials, binding agent and dispersant into de-ionized water followed by ball-milling and mixing to prepare water-base silicon carbide slurry; 2. spray drying the water-base silicon carbide slurry with a spray granulating technique to obtain the silicon carbide granulation powder; 3. molding the silicon carbide granulation powder by dry pre-pressing and cold isostatic final pressing to obtain high density silicon carbide green brick; and 4. placing the high density silicon carbide green brick in a vacuum pressure-free sintering furnace to be heated to 1,900-2,000 DEG C and kept for 1-1.5 hours to obtain boride reinforced silicon carbide ceramics. The boride reinforced silicon carbide ceramics prepared by the method has the characteristics of high hardness, high bending resistance, and excellent fracture toughness property, etc.

Description

technical field [0001] The invention relates to a boride-enhanced 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 in molding also limit its application. With the development of sc...

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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