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Method for preparing poruos material in micro-nano magnitude

A nanoporous, ceramic material technology, applied in ceramic products, other household appliances, household appliances, etc., can solve the problems of difficult to obtain directional porous ceramics, difficult to uniformly disperse pore-forming agents, and restricting the preparation of porous materials, etc. To achieve the effect of easy control of process conditions, consistent pore size and high porosity

Inactive Publication Date: 2005-10-26
曾宇平 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of porous ceramic materials has certain limitations. Usually, in order to obtain porous ceramic materials, a large amount of pore-forming agents must be added during the preparation process, and these pore-forming agents are usually organic polymers. burnt away, leaving holes
This type of process has great limitations. During the degreasing process, organic polymers decompose to produce a large amount of toxic and harmful gases, causing serious pollution to the environment.
In addition, it is difficult for the pore-forming agent to disperse evenly in the ceramic powder, resulting in uneven distribution of pores, and the pore size of the material is generally determined by the size of the pore-forming agent, which limits the preparation of porous materials to a certain extent.
And it is difficult to obtain porous ceramics with aligned alignment

Method used

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  • Method for preparing poruos material in micro-nano magnitude
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Examples

Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 1 As shown, it is a process flow diagram of a preparation method of a micron-nano porous material, and the preparation process of a micron-nano porous material is:

[0028] (1) Preparation of ceramic slurry:

[0029] Mix 27 parts of distilled water and 1 part of dispersant evenly, then add Al with a particle size of 0.8 microns 2 o 3 70 parts of ceramic powder, 2 parts of sintering additive, ball milled for 24 hours;

[0030] (2) Blank forming:

[0031] Pour the mixed ceramic slurry into the mold and put it into the freezer to freeze and shape. The freezing temperature is controlled at -20°C;

[0032] (3) Freeze drying:

[0033] Transferring the frozen ceramic body to a freeze dryer for freeze-drying to obtain a porous body with orientation and uniform distribution;

[0034] (4) Sintering of green body:

[0035] Put the dried ceramic body into a sintering furnace for sintering at a temperature of 1500°C to obtain porous alumina porous ceramics with...

Embodiment 2

[0037] (1) Preparation of ceramic slurry;

[0038] Mix 10 parts of distilled water and 0.5 parts of dispersant evenly, then add Al with a particle size of 0.8 microns 2 o 3 87.5 parts of ceramic powder, 2 parts of sintering additive, ball milled for 24 hours;

[0039] (2) Blank forming:

[0040] Pour the mixed ceramic slurry into the mold and put it into the freezer to freeze and shape. The freezing temperature is controlled at -20°C;

[0041] (3) Freeze drying:

[0042] Transferring the frozen ceramic body to a freeze dryer for freeze-drying to obtain a porous body with orientation and uniform distribution;

[0043] (4) Sintering of green body:

[0044] Put the dried ceramic body into a sintering furnace for sintering at a temperature of 1300°C to obtain a porous alumina ceramic with a porosity of 60%, such as image 3 Shown is the microstructure photo of the porous ceramic. It can be seen from the photo that the pore size 2 of the porous ceramic material 1 is distribut...

Embodiment 3

[0046] (1) Preparation of ceramic slurry;

[0047] Mix 17.5 parts of distilled water and 0.5 parts of dispersant evenly, then add Al with a particle size of 0.8 microns 2 o 3 80 parts of ceramic powder, 2 parts of sintering additive, ball milled for 24 hours;

[0048] (2) Blank forming:

[0049] Pour the mixed ceramic slurry into the mold and put it into the freezer to freeze and shape. The freezing temperature is controlled at -20°C;

[0050] (3) Freeze drying:

[0051] Transferring the frozen ceramic body to a freeze dryer for freeze-drying to obtain a porous body with orientation and uniform distribution;

[0052] (4) Sintering of green body:

[0053] Put the dried ceramic body into a sintering furnace for sintering at a temperature of 1100°C to obtain a porous alumina ceramic with a porosity of 80%, such as Figure 4 Shown is the microstructure photo of the porous ceramic. It can be seen from the photo that the pore size 2 of the porous ceramic material 1 is distribu...

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Abstract

The present invention relates to a preparation method of micrometer-nanometer porous material. Said preparation method includes the following steps: preparing ceramic pulp; using 5 wt%-90 wt% of ceramic powder body, 0.1 wt%-5 wt% of dispersing agent, 1 wt%-20 wt% of sintering additive, and 5 wt%-90 wt% of solvent, uniformly mixing distilled water and ground dispersing agent, then adding ceramic powder body and sintering additive, ball-grinding, and pouring the mixed ceramic pulp into mould, placing said mould into refrigerating tank, refrigerating and forming, mainly the frozen ceramic blank body into freeze-drying machine, freeze-drying, placing the dried ceramic blank body into sintering furnace, sintering so as to obtain the invented micrometer-nanometer porous ceramic material.

Description

technical field [0001] The invention relates to a preparation method of a micro-nano porous material, which is suitable for preparing Al 2 o 3 , SiC, Si 3 N 4 , mullite, TiO 2 , Sialon, cordierite, clay, kaolin, spinel and other porous ceramic thick film materials and bulk materials, which belong to the technical field of preparation of ceramic materials. Background technique [0002] Ceramic slurry molding has been widely used in the preparation of ceramic parts, such as slip casting molding, tape casting molding, direct solidification molding, extrusion molding and so on. However, these processes are often used to prepare dense bulk materials. With the development of industrial technology, the problem of environmental protection has become more and more prominent. The discharge of automobile exhaust, industrial waste gas, waste residue, waste water and smoke has seriously affected people's daily life and has become an urgent problem to be solved. Due to the excellent...

Claims

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Application Information

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IPC IPC(8): C04B38/00
Inventor 曾宇平曹剑武
Owner 曾宇平
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