Method for preparing high-closed-porosity aluminium oxide-aluminium phosphate ceramic

An aluminum phosphate ceramic and porous alumina technology, which is applied in ceramic products, household appliances, other household appliances, etc., can solve the problems of limited increase of closed-cell aluminum, can not effectively reduce open porosity, etc. Effect

Inactive Publication Date: 2018-07-20
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method of adding additives can produce some closed pores, the increase of aluminum with closed pores is limited after all, and the open porosity cannot be effectively reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Dissolve aluminum dihydrogen phosphate and aluminum nitrate in water according to a molar ratio of 1:2 to prepare a mixed solution of aluminum dihydrogen phosphate with a solubility of 0.05 M and aluminum nitrate with a solubility of 0.1 M; prepare it at room temperature The solution is dripped onto the surface of the porous alumina ceramic until the porous alumina ceramic reaches adsorption saturation. The open porosity of the porous alumina ceramic is about 60%, and the closed porosity is about 5%; it is dried and adsorbed at 50℃. The porous alumina ceramic of the solution, the drying time is 48 hours; the surface of the dried porous alumina ceramic forms a thin layer containing aluminum dihydrogen phosphate and aluminum nitrate; the dried product is exposed to the air at a rate of 20 ℃ / min Heat to 300 ℃, then heat at a rate of 5 ℃ / min to 700 ℃ and keep it for 2 hours, then heat at a rate of 5 ℃ / min to 1150 ℃ and keep it for 2 hours, then at a rate of 5 ℃ / min Speed ​​c...

Embodiment 2

[0014] Dissolve aluminum dihydrogen phosphate and aluminum nitrate in water according to a molar ratio of 1:2 to prepare a mixed solution of aluminum dihydrogen phosphate with a solubility of 0.05 M and aluminum nitrate with a solubility of 0.1 M; prepare it at room temperature The solution is dripped onto the surface of the porous alumina ceramic until the porous alumina ceramic reaches adsorption saturation. The open porosity of the porous alumina ceramic is about 50% and the closed porosity is about 7%; the mixed solution is dried and adsorbed at 50°C The drying time of porous alumina ceramics is 48 hours; the surface of the dried porous alumina ceramics forms a thin layer containing aluminum dihydrogen phosphate and aluminum nitrate; the dried product is heated at a rate of 20 ℃ / min in the atmosphere Heat to 300 ℃, then heat at a rate of 5 ℃ / min to 700 ℃ and keep it for 2 hours, then heat at a rate of 5 ℃ / min to 1150 ℃ and keep it for 2 hours, then at a rate of 5 ℃ / min Cool...

Embodiment 3

[0016] Dissolve aluminum dihydrogen phosphate and aluminum nitrate in water at a molar ratio of 1:2 to prepare a mixed solution of aluminum dihydrogen phosphate with a solubility of 0.05 M and aluminum nitrate with a solubility of 0.1 M; prepare the prepared solution at room temperature The solution is dropped on the surface of the porous alumina ceramic until the porous alumina ceramic reaches adsorption saturation. The open porosity of the porous alumina ceramic is about 40% and the closed porosity is about 8%; the mixed solution is dried and adsorbed at 50°C The drying time of porous alumina ceramics is 48 hours; the surface of the dried porous alumina ceramics forms a layer containing aluminum dihydrogen phosphate and aluminum nitrate; the dried product is heated at a rate of 20 ℃ / min in the atmosphere Heat to 300 ℃, then heat at a rate of 5 ℃ / min to 700 ℃ and keep it for 2 hours, then heat at a rate of 5 ℃ / min to 1150 ℃ and keep it for 2 hours, then at a rate of 5 ℃ / min Co...

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Abstract

The invention provides a method for preparing high-closed-porosity aluminium oxide-aluminium phosphate ceramic. The method is characterized by including the following steps that (1), aluminium dihydrogen phosphate and aluminium nitrate are dissolved in water, and a solution is prepared; (2), the prepared solution is dropped onto the surface of porous aluminium oxide ceramic at room temperature till the porous aluminium oxide ceramic achieves adsorption saturation; (3), the porous aluminium oxide ceramic on which the mixed solution is adsorbed is dried at the temperature of 50 DEG C; (4), a dried product is heated to 1,150 DEG C in the atmosphere and subjected to heat preservation for 2 hours, then the dried product is cooled to 800 DEG C at the speed of 5 DEG C / min and subjected to heat preservation for 2 hours, finally the product is naturally furnace-cooled to room temperature, and the high-closed-porosity aluminium oxide-aluminium phosphate ceramic is prepared, wherein the closed porosity is 39% to the maximum degree.

Description

Technical field [0001] The invention provides a method for preparing alumina-aluminum phosphate ceramics with high closed porosity, which belongs to the technical field of preparation of special ceramic materials. Background technique [0002] Both alumina and aluminum phosphate are high temperature resistant materials, and porous alumina ceramics can be used as high temperature insulation materials. However, if there are more open pores in the porous alumina ceramic, its thermal insulation performance will be seriously affected. Therefore, the current commonly used method is to add some additives that can produce closed pores in alumina ceramics, such as silicon carbide. Aluminum phosphate is also a kind of high melting point material, the service temperature can be close to 1400 ℃, and it also has high temperature resistance. Therefore, aluminum phosphate can be introduced into porous alumina ceramics, and the open pores can be blocked with appropriate technology, thereby inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87
CPCC04B41/87C04B41/009C04B41/5048C04B41/4558C04B41/4535C04B35/10C04B38/00
Inventor 白佳海陈一尘贾齐鲁周佐浪孟凡昭高杰
Owner SHANDONG UNIV OF TECH
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