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Method for preparing porous silicon carbide ceramic

A technology of porous silicon carbide and silicon carbide powder, which is applied in ceramic products, applications, household appliances, etc., can solve the problems of low mechanical properties and low porosity of porous silicon carbide ceramics, achieve low thermal expansion coefficient, improve strength performance, and good The effect of high temperature performance

Active Publication Date: 2012-12-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a method for preparing porous silicon carbide ceramics in order to solve the technical problems of low mechanical properties and low porosity of porous silicon carbide ceramics prepared by existing methods

Method used

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  • Method for preparing porous silicon carbide ceramic
  • Method for preparing porous silicon carbide ceramic
  • Method for preparing porous silicon carbide ceramic

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specific Embodiment approach 1

[0033] Embodiment 1: The preparation method of porous silicon carbide ceramics in this embodiment is carried out according to the following method:

[0034] 1. Mix 5-60 parts by mass of raw materials with 40-95 parts by mass of deionized water, then add dispersant, binder and defoamer, and then add silicon carbide balls for ball milling for 24 hours (the mass ratio of balls to materials is 3: 1), obtain slurry;

[0035] The raw material is silicon carbide powder or a mixture of silicon carbide powder and sintering aid, and the mass fraction of the sintering aid in the mixture of silicon carbide powder and sintering aid is 1 to 10%, wherein the silicon carbide powder The mass ratio of silicon carbide powder to dispersant is 1:0.001-0.03, the mass ratio of silicon carbide powder to binder is 1:0.005-0.03, and the mass ratio of silicon carbide powder to defoamer is 1:0.001-0.01;

[0036] The sintering aid described in step 1 is Al 2 o 3 , Y 2 o 3 and BaAl 2Si 2 o 8 one or...

specific Embodiment approach 2

[0048] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mass fraction of the sintering aid in the mixture of silicon carbide powder and sintering aid in step 1 is 5%. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0049] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the mass ratio of silicon carbide powder and dispersant in Step 1 is 1:0.02. Others are the same as in the first embodiment.

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Abstract

The invention discloses a method for preparing porous silicon carbide ceramic, and relates to a method for preparing silicon carbide ceramic. The invention aims to solve the technical problems of low mechanical properties and low porosity of porous silicon carbide ceramic prepared through the existing method. The method comprises the following steps of 1, preparing pulp; 2, preparing a porous ceramic green body; 3, preparing a prefabricated body; 4, preparing carbon gel; 5, preparing a composite material of silicon carbide and the carbon gel; 6, preparing a composite material of porous silicon carbide and carbon aerogel; and 7, putting the composite material of the porous silicon carbide and the carbon aerogel and monatomic silicon powder into a sintering furnace to be sintered to obtain the porous silicon carbide ceramic. The porosity of the opening of the porous silicon carbide is 30-83 percent, the aperture size is 0.3-100m, and pore spaces can be uniformly distributed or directionally arranged. Through a three-point bending test, the bending strength of the finally prepared porous silicon carbide ceramic material with the porosity of 47.8 percent achieves 164.62 MPa.

Description

technical field [0001] The invention relates to a method for preparing silicon carbide ceramics. Background technique [0002] Due to the advantages of low density, high temperature resistance, corrosion resistance, high permeability, good oxidation resistance and thermal shock resistance, porous silicon carbide ceramics are widely used in high temperature gas filter materials, catalyst carriers, gas combustion chamber media and refractory materials. It has broad application prospects. At present, the porous ceramics that have been widely used are mostly oxide ceramics, but they have disadvantages such as poor high-temperature performance and insufficient corrosion resistance, and porous silicon carbide ceramics can just make up for these deficiencies; in addition, many special fields require porous ceramic materials. The performance of silicon carbide puts forward higher requirements, and the advantages of silicon carbide material itself make it one of the ideal materials ...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B35/565C04B35/622
Inventor 叶枫刘强侯赵平刘仕超张海礁
Owner HARBIN INST OF TECH
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