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

A technology of aluminum phosphate ceramics and cordierite, applied in ceramic products, applications, household appliances, etc., can solve the problems of limited increase of closed-pore aluminum and inability to effectively reduce open porosity, and achieve the effect of improving thermal insulation performance

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 into water at a molar ratio of 1:2 to prepare a mixed solution with a solubility of aluminum dihydrogen phosphate of 0.05 M and a solubility of aluminum nitrate of 0.1 M; The solution was dropped onto the surface of porous cordierite ceramics until the porous cordierite ceramics reached adsorption saturation. The open porosity of the porous cordierite ceramics was about 60%, and the closed porosity was about 5%. solution of porous cordierite ceramics, the drying time is 48 hours; the surface of the dried porous cordierite ceramics forms a thin layer containing aluminum dihydrogen phosphate and aluminum nitrate; Heat up to 300°C, then heat up to 700°C at a rate of 5°C / min and hold for 2 hours, then heat up to 1150°C at a rate of 5°C / min and hold for 2 hours, then heat at a rate of 5°C / min Speed ​​cooling down to 800°C and keep it warm for 2 hours, and finally cool down to room temperature naturally with the furn...

Embodiment 2

[0014] Dissolve aluminum dihydrogen phosphate and aluminum nitrate into water at a molar ratio of 1:2 to prepare a mixed solution with a solubility of aluminum dihydrogen phosphate of 0.05 M and a solubility of aluminum nitrate of 0.1 M; The solution was dropped onto the surface of porous cordierite ceramics until the porous cordierite ceramics reached adsorption saturation, in which the open porosity of the porous cordierite ceramics was about 50%, and the closed porosity was about 7%; the mixed solution was dried and adsorbed at 50°C The porous cordierite ceramics were dried for 48 hours; a thin layer containing aluminum dihydrogen phosphate and aluminum nitrate was formed on the surface of the dried porous cordierite ceramics; the dried product was heated at a rate of 20 ℃ / min in the atmosphere Raise the temperature to 300°C, then heat up to 700°C at a rate of 5°C / min and hold for 2 hours, then heat up to 1150°C at a rate of 5°C / min and hold for 2 hours, then heat at a rate ...

Embodiment 3

[0016] Dissolve aluminum dihydrogen phosphate and aluminum nitrate into water at a molar ratio of 1:2 to prepare a mixed solution with a solubility of aluminum dihydrogen phosphate of 0.05 M and a solubility of aluminum nitrate of 0.1 M; The solution is dripped onto the surface of porous cordierite ceramics until the porous cordierite ceramics reaches adsorption saturation, in which the open porosity of the porous cordierite ceramics is about 40%, and the closed porosity is about 8%; the mixed solution is dried and adsorbed at 50°C The porous cordierite ceramics were dried for 48 hours; the surface of the dried porous cordierite ceramics formed a layer of coating containing aluminum dihydrogen phosphate and aluminum nitrate; the dried product was heated at a rate of 20 ℃ / min in the atmosphere Raise the temperature to 300°C, then heat up to 700°C at a rate of 5°C / min and hold for 2 hours, then heat up to 1150°C at a rate of 5°C / min and hold for 2 hours, then heat at a rate of 5°...

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Abstract

The invention provides a method for preparing high-closed-porosity cordierite-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 cordierite ceramic at room temperature till the porous cordierite ceramic achieves adsorption saturation; (3), the porous cordierite ceramic on which the mixed solution is adsorbed is dried at the temperature of 50 DEG C; (4), a dried product is heatedto 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 cordierite-aluminium phosphate ceramic is prepared, wherein the open porosity is not higher than 10% and the closed porosity is 39% to the maximum degree.

Description

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

Claims

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Application Information

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IPC IPC(8): C04B35/447C04B41/87C04B38/00C04B35/195
CPCC04B35/447C04B35/195C04B38/00C04B41/009C04B41/5048C04B41/87C04B2235/6562C04B2235/6567C04B2235/661C04B2235/9607C04B41/4539C04B41/0072C04B38/0074
Inventor 白佳海高杰李向前
Owner SHANDONG UNIV OF TECH
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