Method for preparing alumina porous ceramic using gelatin wrapping-freeze drying process

A drying process, sol-gel technology, applied in the field of porous ceramics, to achieve the effect of convenient casting, good performance controllability and high porosity

Inactive Publication Date: 2007-05-16
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are few reports on the direct molding of ceramic powder by freeze-drying

Method used

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  • Method for preparing alumina porous ceramic using gelatin wrapping-freeze drying process
  • Method for preparing alumina porous ceramic using gelatin wrapping-freeze drying process
  • Method for preparing alumina porous ceramic using gelatin wrapping-freeze drying process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] The present invention will be further described below through specific implementation, but the present invention is by no means limited to the examples, and the process examples are shown in the following table:

[0030]

Example

Solid content adjustment method

Sol solid

Content

binder containing

Amount (wt%)

when freeze-dried

time (hours)

freeze drying

Pressure (Pa)

freeze drying

temperature(℃)

1

heating evaporation

5

3

48

20

60

2

heating evaporation

10

3

48

20

60

[0031] 3

heating evaporation

15

3

48

20

60

4

Add γ-Al 2 O 3

10

3

48

20

60

5

Add γ-Al 2 O 3

15

3

48

20

60

6

Add γ-Al 2 o ...

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PUM

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Abstract

The invention discloses a preparing method of porous alumina ceramic through sol-gel freezing drying technique, which comprises the following steps: adopting aluminium isopropoxide as former; hydrolyzing under high temperature to obtain alumina sol; controlling the solid content of sol; adding moulding agent; blending evenly; casting; moulding; removing air to form vacuum; freezing at low temperature; drying and moulding the frozen sample; detackifying moulded sample under low temperature; placing in the high-temperature furnace; sintering; obtaining the porous alumina ceramic with bending-proof strength reaching 65Mpa and bulk density at 0.14-2.4g/cm3. The adjustable aperture is 1-100um, which can be filter, catalyst carrier and heat insulating material.

Description

technical field [0001] The invention relates to a method for preparing alumina porous ceramics by a sol-gel-freeze-drying process, and more specifically to a method for preparing high-porosity and low-density alumina by combining a sol-gel powder synthesis method with a freeze-drying sample molding process A method for porous ceramics belongs to the field of porous ceramics. Background technique [0002] Alumina porous ceramics are widely used in the fields of filters, catalyst carriers, thermal insulation materials and refractory materials due to their advantages of chemical corrosion resistance, wear resistance, light weight, high permeability, low expansion coefficient and good high temperature stability. Broad application prospects. In order to meet the application in different fields, there are many reports about the preparation method of alumina porous ceramics, for example, Cheng Changrui et al. The salt solution is used as the basic raw material, and the pH value i...

Claims

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Application Information

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IPC IPC(8): C04B35/624C04B35/10C04B38/00
Inventor 曾宇平丁书强江东亮
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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