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Preparation method of silicon carbide porous ceramic capable of serving as high-temperature smoke dust filter

A technology of porous ceramics and silicon carbide, which is applied in the field of porous ceramics to achieve the effects of simple equipment and process flow, improved porosity and high mechanical strength

Active Publication Date: 2011-10-19
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The emulsion template method is used in the preparation of porous ceramics, which can realize the control of the opening and closing of porous ceramic pores, porosity and pore size, but this method can only be combined with the sol-gel process to prepare porous ceramics or ceramics of oxide systems. membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First, water with 1.0 times the mass of silicon carbide powder is used as the dispersion medium, cyclopentane with 2 times the volume of water is used as the organic dispersed phase, and the mass of cyclopentane is used as the dispersion medium. Tween 20 is used as emulsifier, alumina is used as sintering aid, sodium hexametaphosphate is used as dispersant, acrylamide is used as monomer, methylenebisacrylamide is used as crosslinking agent, N,N,N',N '-Tetramethylethylenediamine was used as a catalyst, and the silicon carbide stable suspension slurry was prepared by planetary ball milling at a speed of 60r / min for 15 hours, wherein the amounts of alumina, dispersant, monomer, crosslinking agent, and catalyst were respectively silicon carbide 1.0%, 0.5%, 2%, 0.2%, 0.4% of mass. Add ammonium persulfate as an initiator to the stable suspension slurry, the dosage is 35% of the monomer mass, stir evenly, pour into the mold, let it stand for 20min, and demould. The green bod...

Embodiment 2

[0024] First, water with 2.2 times the mass of silicon carbide powder is used as the dispersion medium, cyclohexane with 5 times the volume of water is used as the organic dispersed phase, and cyclohexane with the mass of cyclohexane is used as the dispersion medium. Sodium dodecylbenzenesulfonate is used as an emulsifier, alumina is used as a sintering aid, ammonium hexametaphosphate is used as a dispersant, dimethylacrylamide is used as a monomer, and dipropylene tartaric acid diamide is used as a crosslinking agent. N,N,N',N'-Tetramethylethylenediamine was used as a catalyst, and the planetary ball milled at a speed of 150r / min for 6h to prepare a stable suspension slurry of silicon carbide, in which alumina, dispersant, monomer, and crosslinking agent , The dosage of the catalyst is 5.0%, 2.5%, 15%, 1.5%, 0.02% of the silicon carbide mass respectively. Add sodium persulfate as an initiator to the stable suspension slurry, the dosage is 40% of the monomer mass, stir evenly...

Embodiment 3

[0026] First, water with 0.5 times the mass of silicon carbide powder is used as the dispersion medium, n-heptane with 11 times the volume of water is used as the organic dispersion phase, and the mass of n-heptane Cetyltrimethylammonium bromide is used as emulsifier, alumina is used as sintering aid, ammonium tripolyphosphate is used as dispersant, styrene is used as monomer, methylenebisacrylamide is used as crosslinking agent, N ,N,N',N'-Tetramethylethylenediamine was used as a catalyst, and the planetary ball milled at a speed of 30r / min for 20h to prepare a stable suspension slurry of silicon carbide, in which alumina, dispersant, monomer, crosslinking agent, The amount of catalyst used is 3.0%, 3.0%, 5.0%, 0.5%, and 0.2% of the silicon carbide mass, respectively. Add sodium persulfate as an initiator to the stable suspension slurry, the dosage is 10% of the mass of the monomer, stir evenly, pour it into the mold, let it stand for 15 minutes, and demould. The green body ...

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PUM

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Abstract

The invention relates to a preparation method of silicon carbide porous ceramic capable of serving as a high-temperature smoke dust filter. The preparation process is implemented by the following steps of: (1) performing ball-milling and mixing on alkane or ester, a surfactant with hydrophile-lipohile balance (HLB) value of 8 to 18, a certain amount of ceramic power, sintering aid, dispersing agent, monomer, crosslinking agent and catalyst, and water to prepare suspending slurry with dispersion stability, wherein the alkane or ester, which is liquid at normal temperature, serves as an organicmatter dispersing phase, the surfactant serves as an emulsifying agent and the water serves as a dispersing medium; (2) adding a proper amount of initiator into the suspending slurry to stir uniformly, pouring into a die to perform crosslinking curing, demoulding, drying a green body, and removing glue; and (3) sintering the green body by a certain sintering system to obtain the silicon carbide porous ceramic finally. The preparation method has the characteristics of greatly increasing quantity of air holes of the silicon carbide porous ceramic and the specific surface area and effectively regulating and controlling aperture size; the required equipment and process flow are simple; and the obtained porous ceramic machine has high strength, long service life and low production cost.

Description

technical field [0001] The invention relates to a preparation method of silicon carbide porous ceramics which can be used as a high-temperature soot filter, more precisely, it relates to a method of introducing the oil droplets in the oil-in-water emulsion into the pores, and mixing with water-based condensation A silicon carbide porous ceramic material is prepared by combining a glue injection molding process, which belongs to the field of porous ceramics. Background technique [0002] In recent years, my country's automobile industry has developed rapidly. In 2009, my country surpassed the United States to become the world's largest automobile production and sales country. It is expected that the automobile industry will become a key industry for my country's regulation and support in the next ten years. With the continuous enhancement of people's awareness of environmental protection, considering the continuous increase in the number of automobiles in my country and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/565
Inventor 袁波王刚吴海波
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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