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A kind of preparation method of SIC porous ceramics

A technology for porous ceramics and ceramic powders, applied in the field of preparation of SiC porous ceramics, can solve the problems of difficult control of pore shape, low porosity of SiC porous ceramics, etc., and achieve effective pollution-free control, low cost, and good uniformity.

Inactive Publication Date: 2016-03-30
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of low porosity and difficult control of pore shape in SiC porous ceramics, the object of the present invention is to provide a preparation method of SiC porous ceramics with high bending strength, high porosity and uniform pores

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The steps of preparing SiC porous ceramics in this embodiment are as follows:

[0021] a. Weigh 7.5% Al by mass 2 o 3 As a sintering aid, 60% by mass of dark green nano-SiC powder (with a particle size range of 50-150nm) is used as a matrix material, and 30% by mass of PMMA powder is a pore-forming agent (with a particle size range of 20-40μm) , the mass percentage is 2.5% phenolic resin as binder;

[0022] b. First mix the dark green nano-SiC powder with Al 2 o 3 and phenolic resin in a ball mill for 8 to 12 hours, and then dry the mixed powder in an oven;

[0023] c. Add the mixed powder and PMMA micropowder in step b into the mixer, and mix for 10-30 minutes;

[0024] d. Press the powder mixed in step c into a blank with a dry press molding machine. The blank is placed in the air for 1 day, dried naturally, and then pretreated in an oven at 80°C for 5 hours, and then heated to 110°C for 10 hours. Obtain a dry green body;

[0025] e. Put the dried body in step ...

Embodiment 2

[0028] The present embodiment is different from Example 1 in that the weight percentage in step a is 2.5% Al 2 o 3 As a sintering aid, dark green nano-SiC powder (with a particle size range of 150-250nm) with a mass percentage of 62.5% is used as the matrix material, and PMMA powder (with a particle size range of 40-60μm). Other steps were the same as in Example 1, and the SiC porous ceramic obtained had a porosity of 34.8% and a flexural strength of 22.8 MPa.

Embodiment 3

[0030] The difference between this embodiment and embodiment 1 is that the weight percentage in step a is 5% Al 2 o 3 As a sintering aid, dark green nano-SiC powder (with a particle size range of 250-350nm) with a mass percentage of 57.5% is used as the matrix material, and PMMA powder (with a particle size range of 60-75μm). In step e, put the body into a high-temperature furnace, raise the temperature to 1400° C. at a rate of 8° C. / min, and keep the temperature for 2 hours. Other steps were the same as in Example 1, and the SiC porous ceramic obtained had a porosity of 35.8% and a flexural strength of 32.6 MPa.

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Abstract

The invention discloses a preparation method of a SiC porous ceramic. The SiC porous ceramic is composed of the following components in percentage by mass: 2.5-8.8% of Al2O3 used as a sintering aid, 55-80% of green-black nano SiC micropowder used as a base material, 10-35% of PMMA (polymethyl methacrylate) micropowder used as a pore forming agent, and 1.2-7.5% of phenol aldehyde resin used as an adhesive. The method comprises the following steps: mixing the sintering aid, base material and adhesive in a ball mill for 8-12 hours; adding the mixed powder and pore forming agent into the mixer, mixing for 10-30 minutes, and carrying out dry press forming; carrying out high-temperature sintering on the porous ceramic billet in an air atmosphere; and carrying out furnace cooling to obtain the SiC porous ceramic. The SiC ceramic billet has the advantages of favorable uniformity, high bending strength, high void volume and high pore uniformity. The method has the advantages of simple technique, low cost and less equipment, and has application prospects in the aspects of automobile tail gas / plant waste gas filtering dust removal, power plant gas purification and the like.

Description

technical field [0001] The invention relates to a method for preparing ceramics, in particular to a method for preparing SiC porous ceramics. Background technique [0002] Porous ceramic materials have a very wide range of application prospects, such as high-temperature filters for molten metal or hot gases, microbial filtration of clinical bacteria in medicine, filter membranes in chemical reactions, catalyst carriers, etc. Among them, porous silicon carbide (SiC) ceramics have excellent properties such as stable structure and physical and chemical properties, high temperature oxidation resistance, acid and alkali corrosion resistance, good thermal conductivity, small thermal expansion coefficient, strong thermal shock resistance, good air permeability, and low pressure drop. It is the preferred high temperature ceramic filter material. High-strength, high-porosity, uniform-pore SiC porous ceramics are essential for the prevention and control of smog weather, high-temperat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B35/565
Inventor 陈建军柳兆祥王明明廖欣
Owner ZHEJIANG SCI-TECH UNIV