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Method for preparing high-closed-porosity quartz-aluminum phosphate ceramics

A technology of closed pores and aluminum phosphate, which is applied in the field of preparing quartz-aluminophosphate ceramics with high closed pores, can solve the problems of limited increase of closed pores aluminum, can not effectively reduce open pores, etc., and achieve the effect of improving thermal insulation performance

Inactive Publication Date: 2018-09-04
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 quartz ceramics until the porous quartz ceramics reach adsorption saturation. The open porosity of the porous quartz ceramics is about 60%, and the closed porosity is about 5%. Quartz ceramics, the drying time is 48 hours; a thin layer containing aluminum dihydrogen phosphate and aluminum nitrate is formed on the surface of the dried porous quartz ceramics; the dried product is heated to 300 °C at a rate of 20 °C / min in the atmosphere , then heated up to 700°C at a rate of 5°C / min and held for 2 hours, then heated up to 1150°C at a rate of 5°C / min and held for 2 hours, then cooled to 800°C at a rate of 5°C / min ℃ and keep it warm for 2 hours, and finally cool down to room temperature naturally wi...

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 porous quartz ceramics until the porous quartz ceramics reach adsorption saturation, wherein the open porosity of the porous quartz ceramics is about 50%, and the closed porosity is about 7%; dry the porous quartz that has absorbed the mixed solution at 50°C Ceramics, the drying time is 48 hours; the surface of the dried porous quartz ceramics forms a thin layer containing aluminum dihydrogen phosphate and aluminum nitrate; the dried product is heated to 300 °C at a rate of 20 °C / min in the atmosphere, 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 cool down to 800°C at a rate of 5°C / min And keep it warm for 2 hours, a...

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 quartz ceramics until the porous quartz ceramics reaches adsorption saturation. The open porosity of the porous quartz ceramics is about 40%, and the closed porosity is about 8%. Dry the porous quartz that has absorbed the mixed solution at 50°C Ceramics, the drying time is 48 hours; the surface of the dried porous quartz ceramics forms a coating containing aluminum dihydrogen phosphate and aluminum nitrate; the dried product is heated to 300 °C at a rate of 20 °C / min in the atmosphere, 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 cool down to 800°C at a rate of 5°C / min And keep it warm for 2 hours, and ...

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Abstract

The invention provides a method for preparing high-closed-porosity quartz-aluminum phosphate ceramics. The method is characterized by using the following steps of (1) dissolving aluminum dihydrogen phosphate and aluminum nitrate into water to be prepared into a solution; (2) dripping the prepared solution onto the surface of the porous quartz ceramics at room temperature until the porous quartz ceramics reach the adsorption saturation; (3) drying the porous quartz ceramics adsorbing the mixed solution at 50 DEG C; (4) heating the dried products in the air atmosphere to raise the temperature to1150 DEG C; performing heat insulation for 2 hours; then, performing temperature lowering and cooling at the speed of 5 DEG C / min to reach 800 DEG C; performing heat insulation for 2 hours; finally,performing natural furnacecooling to reach the room temperature to obtain the high-closed-porosity quartz-aluminum phosphate ceramics. The open porosity is not higher than 10 percent; the closed porosity rate reaches 39 percent to the highest degree.

Description

technical field [0001] The invention provides a method for preparing high closed porosity quartz-aluminum phosphate ceramics, which belongs to the technical field of preparation of special ceramic materials. Background technique [0002] Both quartz and aluminum phosphate are high temperature resistant materials, among which porous quartz ceramics can be used as high temperature insulation materials. However, if there are many open pores in porous quartz ceramics, its thermal insulation performance will be seriously affected. Therefore, the commonly used method at present is to add some additives that can produce closed pores, such as SiC, etc., in quartz 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 quartz ceramics, and the open pores can be blocked with appropriate technology, thereby increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87C04B35/14
CPCC04B41/5048C04B35/14C04B41/009C04B41/87C04B41/4535C04B41/0072
Inventor 白佳海高杰
Owner SHANDONG UNIV OF TECH
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