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Method for manufacturing porous silicon carbide ceramic

A technology of porous silicon carbide and a manufacturing method, applied in ceramic products, applications, household appliances, etc., can solve the problems of high sintering temperature, increase the cost of preparing silicon carbide porous ceramics, etc., and achieve the effect of overcoming difficulty in sintering

Inactive Publication Date: 2015-05-27
宋永法
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the bonding mode between silicon carbide particles, the preparation method of silicon carbide porous ceramics is mostly direct synthesis method. This method realizes sintering by direct bonding between silicon carbide particles. The silicon carbide porous ceramics obtained by this method have excellent mechanical properties. However, the sintering temperature is high and inert gas protection is required, thus increasing the preparation cost of silicon carbide porous ceramics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1) Preparation of porous ceramic powder

[0016] Weigh 106.25g of silicon carbide, 63.75g of alumina, and 30g of graphite with an average particle size of 5 μm and stir evenly to obtain ceramic powder.

[0017] 2) Mixing

[0018] Using alcohol as a dispersion solvent, add 6g of phenolic resin as a binder, mix the phenolic resin and alcohol at a volume ratio of 1:10 to obtain a mixing solution; mix the ceramic powder with the premixed solution, use silicon carbide grinding balls, and The mass ratio of the material to the grinding ball is 1:2, and the above-mentioned ceramic powder and the mixing solution are planetary-milled in a polytetrafluoroethylene ball mill jar for 2 hours to obtain a ceramic slurry.

[0019] 3) dry

[0020] Pour the slurry obtained in step 2) into a pear-shaped bottle, dry it in a rotary evaporator at 80°C for 2 hours (the purpose is to remove the solvent), dry the powder, grind it, and pass it through a 120-mesh sieve to obtain a dry Powder. ...

Embodiment 2

[0026] 1) Preparation of porous ceramic powder

[0027] Weigh 87.5g of silicon carbide, 52.5g of alumina, and 60g of graphite with an average particle size of 5 μm and stir evenly to obtain ceramic powder.

[0028] 2) Mixing

[0029] Using alcohol as a dispersion solvent, add 6g of phenolic resin as a binder, mix the phenolic resin and alcohol at a volume ratio of 1:10 to obtain a mixing solution; mix the ceramic powder with the premixed solution, use silicon carbide grinding balls, and The mass ratio of the material to the grinding ball is 1:2, and the above-mentioned ceramic powder and the mixing solution are planetary-milled in a polytetrafluoroethylene ball mill jar for 2 hours to obtain a ceramic slurry.

[0030] 3) dry

[0031] Pour the slurry obtained in step 2) into a pear-shaped bottle, dry it in a rotary evaporator at 80°C for 2 hours (the purpose is to remove the solvent), dry the powder, grind it, and pass it through a 120-mesh sieve to obtain a dry powder mater...

Embodiment 3

[0037] 1) Preparation of porous ceramic powder

[0038] 105.26g of silicon carbide, 63.75g of alumina, and 30g of graphite with an average particle size of 5 μm were weighed and stirred evenly to obtain ceramic powder.

[0039] 2) Mixing

[0040]Using alcohol as a dispersing solvent, add 6g of phenolic resin as a binder, mix the phenolic resin and alcohol at a volume ratio of 1:10 to obtain a mixing solution; mix the ceramic powder with the premixed solution, and use silicon carbide grinding balls, according to The mass ratio of the powder to the grinding ball is 1:2, and the above ceramic powder and the mixing solution are planetary ball milled in a polytetrafluoroethylene ball mill jar for 2 hours to obtain a ceramic slurry.

[0041] 3) dry

[0042] Pour the slurry obtained in step 2) into a pear-shaped bottle, dry it in a rotary evaporator at 80°C for 2 hours (the purpose is to remove the solvent), dry the powder, grind it, and pass it through a 120-mesh sieve to obtain a...

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Abstract

The invention discloses a method for manufacturing a porous silicon carbide ceramic. The porous silicon carbide ceramic manufactured by using the method overcomes the defect that silicon carbide is difficult to sinter, has an intercommunicated open pore structure, and can realize near size sintering. The method is implemented through the following technical scheme: silicon carbide and aluminum oxide are used as main raw materials, the ratio of the silicon carbide to the aluminum oxide is 5:3, graphite is used as a pore forming agent, and the content of the pore forming agent is controlled to be 15-30wt%. Alcohol is used as a dispersion medium, a proper amount of phenolic resin is added as an adhesive, and dispersed slurry is obtained in a ball milling manner, wherein the mass ratio of powder to milling balls is 1:2. The solvent is removed from the slurry by adopting a rotary evaporator to obtain dried powder. The dried powder is pressed into a green body by a cold press under the pressure of 30-90MPa, the obtained green body is heated to the sintering temperature of 1400-1550 DEG C in a quick heating furnace, natural cooling is carried out after the sintering temperature is kept for 1-4 hours, and the rate from room temperature to the sintering temperature and from cooling after sintering to room temperature is about 5 DEG C per minute in the sintering process.

Description

technical field [0001] The invention relates to a method for manufacturing silicon carbide ceramic materials, in particular to a method for preparing porous silicon carbide ceramics. Background technique [0002] Porous silicon carbide ceramics is a new type of functional material with many pores in its internal structure. Due to the characteristics of low density, high strength, high porosity, high permeability, large specific surface area, corrosion resistance, oxidation resistance, good heat insulation, shock resistance and high temperature resistance, it is widely used in general industrial fields and high-tech field has been more and more widely used. For example: it can be used as high-temperature gas purifier, solid particle filter for diesel engine emission, molten metal filter, heat exchanger, sensor, heat preservation and sound insulation material, catalyst carrier for automobile exhaust, etc. In addition, they also have potential applications in the biomedical f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/565C04B35/622
Inventor 宋永法
Owner 宋永法
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