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Method for preparing high closed porosity forsterite-aluminium phosphate ceramic

A technology of forsterite and closed pores, which is applied in the field of preparation of forsterite-aluminum phosphate ceramics with high closed pores, can solve the problems of limited increase of closed pores aluminum, can not effectively reduce open pores, etc., to improve thermal insulation performance Effect

Inactive Publication Date: 2018-08-14
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; Drop the solution onto the surface of the porous forsterite ceramics until the porous forsterite ceramics reach adsorption saturation, wherein the open porosity of the porous forsterite ceramics is about 60%, and the closed porosity is about 5%; dry at 50°C The porous forsterite ceramics that has absorbed the mixed solution, the drying time is 48 hours; the surface of the dried porous forsterite ceramics forms a thin layer containing aluminum dihydrogen phosphate and aluminum nitrate; Heat up to 300°C at a speed of ℃ / min, then heat up to 700°C at a speed of 5°C / min and hold for 2 hours, then heat up to 1150°C at a speed of 5°C / min and hold for 2 hours, then Cool down to 800 °C at a rate of 5 °C / min and keep it warm for 2 hours, and finally coo...

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; Drop the solution onto the surface of the porous forsterite ceramics until the porous forsterite ceramics reach adsorption saturation. The open porosity of the porous forsterite ceramics is about 50%, and the closed porosity is about 7%. Dry the adsorption at 50°C The porous forsterite ceramics with the mixed solution was dried for 48 hours; a thin layer containing aluminum dihydrogen phosphate and aluminum nitrate was formed on the surface of the dried porous forsterite ceramics; / min to 300°C, then to 700°C at a rate of 5°C / min and held for 2 hours, then heated to 1150°C at a rate of 5°C / min and held for 2 hours, followed by 5°C / min Cool down to 800 °C at a rate of °C / min and keep it warm for 2 hours, and finally cool down to room temperatur...

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 the porous forsterite ceramics until the porous forsterite ceramics reach adsorption saturation. The open porosity of the porous forsterite ceramics is about 40%, and the closed porosity is about 8%. Dry the adsorption at 50°C The porous forsterite ceramics with the mixed solution was dried for 48 hours; the surface of the dried porous forsterite ceramics formed a layer of coating containing aluminum dihydrogen phosphate and aluminum nitrate; / min to 300°C, then to 700°C at a rate of 5°C / min and held for 2 hours, then heated to 1150°C at a rate of 5°C / min and held for 2 hours, followed by 5°C / min Cool down at a rate of ℃ / min to 800 ℃ and hold for 2 hours, and finally cool down to room temperature nat...

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PUM

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Abstract

The invention relates to a method for preparing a high closed porosity forsterite-aluminium phosphate ceramic. The method is characterized by comprising the following steps: (1) dissolving aluminium dihydrogen phosphate and aluminium nitrate in water to prepare a solution; (2) dropping the prepared solution on the surface of a porous forsterite ceramic at room temperature until the porous forsterite ceramic reaches adsorption and saturation; (3) drying and adsorbing the porous forsterite ceramic of the mixed solution at 50 DEG C; and (4) heating the dried product to 1,150 DEG C under the atmosphere and preserving heat for 2 h, and cooling to 800 DEG C at the speed of 5 DEG C / min and preserving heat for 2 h, and finally naturally cooling to room temperature along with a furnace, thereby preparing the high closed porosity forsterite-aluminium phosphate ceramic. The high closed porosity forsterite-aluminium phosphate ceramic is not higher than 10% in open porosity, and is 39% in maximum closed porosity.

Description

technical field [0001] The invention provides a method for preparing forsterite-aluminum phosphate ceramics with high closed porosity, which belongs to the technical field of preparation of special ceramic materials. Background technique [0002] Both forsterite and aluminum phosphate are high-temperature-resistant materials, and porous forsterite ceramics can be used as high-temperature insulation materials. However, if there are more open pores in the porous forsterite 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 SiC, etc., in forsterite 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 forsterite ceramics, and the open pores can be blocked with appropriate techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/447C04B35/622C04B41/87
CPCC04B41/5048C04B35/447C04B35/62218C04B41/009C04B41/87C04B2235/3217C04B2235/447C04B35/16
Inventor 白佳海高杰
Owner SHANDONG UNIV OF TECH
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