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Al2O3-ZrO2 based foamed ceramic of multistage hole structure and preparation method thereof

A technology of foam ceramics and multi-stage pores, which is applied in the field of foam ceramics, can solve the problems of reduced filtration efficiency of SiC foam ceramics, reduction of thermal shock stability of foam ceramics, high-temperature mechanical properties, single structure and size, etc., to improve filtration efficiency and Effects of catalytic loading efficiency, improvement of mechanical properties and thermal shock stability, and increase of specific surface area

Inactive Publication Date: 2019-05-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its main defects are: (1) The hollow triangular holes produced by the in-situ decomposition of polyurethane sponge are not treated, and it is easy to form stress concentration under the action of external stress, resulting in damage to the foamed ceramics; (2) SiC foamed ceramics prepared by this technology The glass phase is contained in the SiC foam ceramics, which reduces the thermal shock stability and high temperature mechanical properties of the foamed ceramics; (3) The structure and size of the pores are single, resulting in a significant reduction in the filtration efficiency of the SiC foamed ceramics
But its main defect is: (1) did not modify the hollow triangular holes and the cracks on the surface of the ceramic substrate due to the burning of the polyurethane sponge; (2) the pore structure and pore size of the porous body and the structure of the soft polyurethane sponge Consistent, resulting in a significant reduction in the filtration efficiency of alumina porous foam ceramics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Al with a hierarchical porous structure 2 o 3 -ZrO 2 Base foam ceramics and preparation method thereof, the steps of the preparation method are:

[0032] Step 1, 60~70 parts of quality Al 2 o 3 Micropowder and 30-40 parts by mass of ZrO 2 Mix the micro-powders to obtain mixed powder I, and then add 0.1 to 1 part by mass of dispersant, 0.3 to 1 part by mass of thickener, 0.1 to 0.5 parts by mass of binder and 20 to 50 parts by mass of water to mixed powder I, Mechanical ball milling for 30-60 minutes to obtain slurry I;

[0033] Step 2, 50~60 parts of quality Al 2 o 3 Micropowder, 30-40 parts by mass of ZrO 2 Mix the fine powder with 10 parts by mass of pore-forming agent to obtain mixed powder II, then add 0.1 to 0.8 parts by mass of dispersant and 30 to 55 parts by mass of water to mixed powder II, and mechanically ball mill for 1 to 1.5 hours to obtain slurry Body II;

[0034] Step 3: Immerse the polyurethane sponge in the slurry I at room temperature, blow ...

Embodiment 2

[0039] Al with a hierarchical porous structure 2 o 3 -ZrO 2 Base ceramic foam and its preparation method. The preparation method shown in this embodiment is the same as in Example 1 except step 2.

[0040] Step 2, 60~70 parts of quality Al 2 o 3 Micropowder, 20-30 parts by mass of ZrO 2 Mix the fine powder with 10 parts by mass of pore-forming agent to obtain mixed powder II, then add 0.1 to 0.8 parts by mass of dispersant and 30 to 55 parts by mass of water to mixed powder II, and mechanically ball mill for 1 to 1.5 hours to obtain slurry Body II;

[0041] The pore forming agent is inorganic carbon.

[0042] The Al of the hierarchical porous structure prepared in the present embodiment 2 2 o 3 -ZrO 2 Base foam ceramics, after testing: the porosity is 78-88%; the porosity of the micron level and sub-micron level is greater than 25%; the specific surface area is 0.30-0.48m 2 / g; the compressive strength at room temperature is 2.5-4.3MPa; the number of water cooling c...

Embodiment 3

[0044] Al with a hierarchical porous structure 2 o 3 -ZrO 2 Base foam ceramics and preparation method thereof, the steps of the preparation method are:

[0045] Step 1, 70~80 parts of quality Al 2 o 3 Micropowder and 20 to 30 parts by mass of ZrO 2 Mix the micro-powders to obtain mixed powder I, and then add 0.1 to 1 part by mass of dispersant, 0.3 to 1 part by mass of thickener, 0.1 to 0.5 parts by mass of binder and 20 to 50 parts by mass of water to mixed powder I, Mechanical ball milling for 30-60 minutes to obtain slurry I;

[0046] Step 2, 50~60 parts of quality Al 2 o 3 Micropowder, 30-40 parts by mass of ZrO 2 Mix the fine powder with 10 parts by mass of pore-forming agent to obtain mixed powder II, then add 0.1 to 0.8 parts by mass of dispersant and 30 to 55 parts by mass of water to mixed powder II, and mechanically ball mill for 1 to 1.5 hours to obtain slurry Body II;

[0047] Step 3: Immerse the polyurethane sponge in the slurry I at room temperature, bl...

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PUM

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Abstract

The invention relates to an Al2O3-ZrO2 based foamed ceramic of a multistage hole structure and a preparation method thereof. Firstly, Al2O3 micro powder, ZrO2 micro powder, dispersing agents, thickening agents, combining agents and water are uniformly mixed to prepare slurry I; the Al2O3 micro powder, the ZrO2 micro powder, the pore forming agents, the dispersion agents and the water are uniformlymixed to prepare slurry II; polyurethane sponge is impregnated in the slurry I; compressed air is used for spray blowing or centrifugal slurry throwing; through drying and presintering, a presintering body is obtained; the slurry II is used for performing secondary negative pressure impregnation on the presintering body; blasting spray blowing or centrifugal slurry throwing is performed; then, freezing and vacuum drying are performed to obtain a ceramic blank of a multistage hole structure; heat insulation is performed to obtain the Al2O3-ZrO2 based foamed ceramic of the multistage hole structure. The prepared foamed ceramic has various pore structures, high porosity, large specific surface area, high intensity, high thermal shock stability and high adsorption capacity; when the foamed ceramic is used as a catalyst carrier, the loading quantity of catalysts in the unit volume can be obviously increased.

Description

technical field [0001] The invention belongs to the technical field of foam ceramics, in particular to an Al foam with a multi-level porous structure. 2 o 3 -ZrO 2 Base ceramic foam and its preparation method. Background technique [0002] Foam ceramics is a porous ceramic product with a porosity as high as 70-90%, a three-dimensional network skeleton and an interpenetrating pore structure. Because of its high temperature resistance, corrosion resistance, high strength, large specific surface area and excellent thermal shock resistance, it is widely used in molten metal filtration, catalyst carrier, petrochemical, sewage treatment and other fields. Foam ceramics play an important role in national economic development. How to improve the filtration efficiency of metallurgical molten metal and improve the sewage treatment capacity is an important issue related to the rapid development of the national economy. al 2 o 3 Because of its high resistance to molten metal erosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B38/06
Inventor 贾文宝劳栋黑大千陈若愚
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS