Method for making support body of porous ceramic filter pipe capable of improving strength and pore connectivity

A technology for porous ceramics and strength improvement, applied in the field of ceramic materials, can solve the problems of reduced filtration rate, uneven distribution, easy agglomeration, etc., and achieve the effects of easy adjustment of porosity, high pore connectivity, and reasonable structural design

Inactive Publication Date: 2010-12-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many deficiencies in the existing preparation process, such as uneven distribution of ceramic binder powder on the surface of ceramic aggregate particles, ceramic binder cannot firmly connect the neck of ceramic aggregate particles after melting, resulting in The mechanical strength is not high; in addition, the ceramic binder powder itself is easy to agglomerate, and it is easy to block the pores of porous ceramics after sintering, which reduces the connectivity of porous ceramic pores and ultimately leads to a decrease in filtration rate

Method used

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  • Method for making support body of porous ceramic filter pipe capable of improving strength and pore connectivity
  • Method for making support body of porous ceramic filter pipe capable of improving strength and pore connectivity
  • Method for making support body of porous ceramic filter pipe capable of improving strength and pore connectivity

Examples

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preparation example Construction

[0042] Preparation of ceramic binder powder:

[0043] The mass fraction of 65% feldspar, 12% clay and 23% silicon oxide was ball milled and mixed with deionized water for 36 hours, and then dried at 100°C to obtain a mixed ceramic binder powder. The average particle size of the ceramic binder powder is 10 μm.

Embodiment 1

[0045] Firstly, an aqueous slurry of sodium carboxymethylcellulose with a mass fraction of 2% and an aqueous slurry of polyvinyl alcohol with a mass fraction of 5% were prepared. Add 2g sodium carboxymethylcellulose powder and 5g polyvinyl alcohol powder into two containers respectively, inject an appropriate amount of water, boil it under magnetic stirring, and dissolve sodium carboxymethylcellulose and polyvinyl alcohol and A uniform slurry was formed, and finally the total weight of the slurry was respectively 100 g.

[0046] Fully mix 90 g of silicon carbide ceramic aggregate with a particle size of 300 μm and 10 g of sodium carboxymethyl cellulose slurry with a mass fraction of 2%, and then add 10 g of ceramic binder powder several times under constant stirring, and mix thoroughly. After mixing well, add 6g of graphite powder with an average particle size of 10μm, and mix thoroughly. Then, after dry pressing at 90MPa, it was sintered at 1300°C for 3h.

[0047] The test re...

Embodiment 2

[0049] Fully mix 85g of silicon carbide ceramic aggregate with a particle size of 300 μm and 7g of the sodium carboxymethylcellulose slurry with a mass fraction of 2% prepared in Example 1, and then add the ceramic binder in small amounts and several times while stirring continuously 15g of powder, mix thoroughly, then add 6g of graphite powder with an average particle size of 10μm, and mix thoroughly. Then, after dry pressing at 13MPa, it was sintered at 1300°C for 3h.

[0050] The test results are: using 300μm silicon carbide aggregate, adding 15% by mass fraction of ceramic binder, plus 6% by mass fraction of graphite powder pore-forming agent, after dry pressing at 13MPa and sintering at 1300°C for 3 hours, the obtained The porosity of the support is 39%, and the bending strength is 25MPa.

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Abstract

The invention provides a method for making a support body of a porous ceramic filter pipe capable of improving strength and pore connectivity, belonging to the technical field of preparing the support body of the porous ceramic filter pipe. The method is characterized in that ceramic binder powder and pore-forming agent powder are sequentially coated on the surface of silicon carbide ceramic aggregate grains, wherein, the ceramic binder powder is spliced with the silicon carbide ceramic aggregate grains together by an organic binder; the obtained powder is taken as a raw material to make a support body blank; in the blank, the ceramic aggregate grains, the ceramic binder powder and the pore-forming agent powder have rational structural distribution; and the support body obtained by sintering the blank at high temperature has the advantages of good strength, high pore connectivity and easy adjustment of porosity.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a preparation method of a porous ceramic filter tube support body with high strength and high pore connectivity for high-temperature filtration. The support body for high-temperature filtration can be used for high-temperature gas-solid separation and filtration, and can also be used for other liquid-solid separation and filtration. Background technique [0002] Ceramics are usually widely used in the fields of energy, chemical industry, and waste treatment due to their high strength, high temperature resistance, and corrosion resistance. Porous ceramics are often used for gas-solid separation, liquid-solid separation, etc. due to their pore structure. In order to obtain a high filtration rate at a low filtration pressure drop, a double-layer composite structure porous ceramic filter tube was developed. The porous ceramic filter tube with double-layer comp...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622
Inventor 李建保李俊峰林红
Owner TSINGHUA UNIV
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