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Porous-ceramic with uniformly through ducts as well as preparation method and use of porous-ceramic

A technology of porous ceramics and channels, which is applied in the field of porous ceramics to achieve high filtration efficiency, good recycling ability, and easy to wash off

Active Publication Date: 2015-09-16
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the defects of the existing powder sintering method for preparing porous ceramics, the technical problem solved by this patent is to use dense spherical particles with low sintering activity to create pores through close packing between powder particles, and use the contact parts between the close packing particles to form neck sintering and The low-activity and dense surface is difficult to undergo surface melting and sintering. After high-temperature sintering, the particle accumulation neck forms sintering, which provides ceramic strength, and the accumulation gap is retained to form a uniform channel.

Method used

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  • Porous-ceramic with uniformly through ducts as well as preparation method and use of porous-ceramic
  • Porous-ceramic with uniformly through ducts as well as preparation method and use of porous-ceramic

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preparation example Construction

[0036] combined withfigure 1 The preparation process of the present invention is further described.

[0037] The flow chart of the preparation of porous ceramics with uniform pore size and three-dimensional penetration is shown in the attached figure 1 Shown:

[0038] (1) Dense spherical particles with low sintering activity refer to spherical particles whose specific surface area is close to the theoretical value, and these particles can be obtained by melting, especially by thermal plasma spheroidizing and melting.

[0039] (2) Preparation of the premix: prepare the premix according to 2-20 wt.% of the organic monomer, and the mass ratio of MBAM to the organic monomer is 1:30-1:10.

[0040] (3) Pour the premix into spherical particles, add catalyst and initiator, mix well, and use a specific method to achieve close packing of spherical particles. Of which (NH 4 ) 2 S 2 o 4 Occupying 3-10% of the mass fraction of organic monomers, (NH 4 ) 2 S 2 o 4 The mass ratio to...

Embodiment 1

[0045] According to 2wt.% of organic monomer, the mass ratio of MBAM to organic monomer is 1:30, (NH 4 ) 2 S 2 o 4 Occupying 3% of the mass fraction of organic monomers, (NH 4 ) 2 S 2 o 4 The mass ratio with TEMED polyol is 1:1, and the mixed liquid is prepared. Pour the mixed solution into spherical silicon oxide particles with a particle size of 30 μm, control the amount of the premixed solution, configure it into a uniform slurry, place it at 80° C., and polymerize for 10 minutes. After the green body is dried, it is sintered at 1200°C for 2 hours to obtain a porous ceramic with an average pore diameter of 8 μm and a strength of 25 MPa.

Embodiment 2

[0047] According to 6wt.% of organic monomer, the mass ratio of MBAM to organic monomer is 1:20, (NH 4 ) 2 S 2 o 4 Occupying 5% of the mass fraction of organic monomers, (NH 4 ) 2 S 2 o 4 The mass ratio of TEMED polyol is 1:2, and the mixed liquid is prepared. Pour the mixed solution into spherical silicon oxide particles with a particle size of 50 μm, control the amount of the premixed solution, configure it into a uniform slurry, place it at 70° C., and polymerize for 20 minutes. After the green body is dried, it is sintered at 1200° C. for 2 hours to obtain a porous ceramic with an average pore diameter of 15 μm and a strength of 15 MPa.

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Abstract

The invention discloses a porous-ceramic with uniformly through ducts as well as a preparation method and use of the porous-ceramic. The invention discloses a preparation method of the porous-ceramic with three-dimensionally through ducts, uniform porosity distribution and adjustable pore-size linearity. A raw material adopted by the invention is uniform low-activity compact spherical particles, the contact parts of the spherical particles are used for providing ceramic strength while a sintering neck is formed through sintering, and a three-dimensional duct is formed by stacking gap of the spherical particles. The typical preparation method comprises the following steps: mixing a certain amount of organic monomers such as MBAM, (NH4)2S2O4 and TEMED to prepare a premixed solution, pouring the premixed solution into the low-activity compact spherical particles, controlling the adding amount of the premixed solution, and realizing tight stacking of the spherical particles by using a certain method; curing the stacked particle accumulation body at a certain temperature; and drying and sintering the cured blank body to obtain the porous-ceramic. The porous-ceramic prepared through the invention has good separation efficiency and flux on the separation of the oil-water mixture, and can be widely applied to the fields of high-temperature flue gas and melt filtering.

Description

technical field [0001] The invention relates to the field of porous ceramics, in particular to the preparation of porous ceramics with uniform and controllable pore diameters and three-dimensional through-hole channels. Background technique [0002] Porous ceramic materials have penetrated into many fields. Many scientific fields such as environmental protection, energy saving, chemical industry, petroleum, smelting, food, pharmaceuticals, and biomedicine are inseparable from porous ceramic materials, especially in filtration, sound absorption, electrode materials, catalysis, insulation, etc. It plays an irreplaceable role in heat and biological materials. [0003] The pore structure characteristics of porous ceramic materials determine its performance, and the uniformity and penetration of pores have an important impact on the performance of porous ceramics. In 2006, Journal of Membrane Science described the preparation of porous ceramic membranes with an average pore size...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B35/634C04B35/185C04B35/04C04B35/443C04B35/565C04B35/10C04B35/14
Inventor 袁方利孙志强范俊梅
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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