Regulation method for pore structure of laminated porous alumina ceramics

A technology of porous alumina and pore structure, which is applied in the field of porous ceramic materials, can solve the problems of difficult precise control of ice crystal morphology and the inability to effectively and accurately control pore structure, and achieve the effect of meeting application requirements

Inactive Publication Date: 2016-08-24
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to precisely control the morphology of ice crystals, thus, it is still not possible to effectively and accurately control the pore structure of this layered porous ceramic.

Method used

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  • Regulation method for pore structure of laminated porous alumina ceramics
  • Regulation method for pore structure of laminated porous alumina ceramics
  • Regulation method for pore structure of laminated porous alumina ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Pour the nanoscale alumina powder into deionized water and stir evenly to obtain an alumina suspension with an alumina content of 15 wt% (mass percentage);

[0026] 2) Into the alumina suspension prepared in step (1), add titanium dioxide nanopowders accounting for 1wt.% of the alumina mass, stir and disperse by ultrasonic waves to obtain a uniform alumina suspension mixed with sintering aids. turbid liquid;

[0027] 3) the aluminum oxide suspension mixed with sintering aid obtained in step (2) is placed in a polytetrafluoroethylene container, and the wall thickness of the container is 5 mm, and then the polytetrafluoroethylene container is placed on a solid On the metal block (as a cold finger), the lower half of the metal block is immersed in the refrigerant, and the aluminum oxide suspension mixed with the sintering aid is directional frozen through the heat transfer of the metal block until the suspension is completely solidified. Until the ice is reached, the i...

Embodiment 2

[0032] 1) Pour the nanoscale alumina powder into deionized water and stir evenly to obtain an alumina suspension with an alumina content of 15 wt% (mass percentage);

[0033] 2) In the alumina suspension prepared in step (1), 3 wt.% titanium dioxide nanopowder is mixed into the alumina suspension, stirred and dispersed by ultrasonic waves to obtain a uniform alumina suspension mixed with sintering aids. turbid liquid;

[0034] 3) the aluminum oxide suspension mixed with sintering aid obtained in step (2) is placed in a polytetrafluoroethylene container, and the wall thickness of the container is 5 mm, and then the polytetrafluoroethylene container is placed on a solid On the metal block (as a cold finger), the lower half of the metal block is immersed in the refrigerant, and the aluminum oxide suspension mixed with the sintering aid is directional frozen through the heat transfer of the metal block until the suspension is completely solidified. Until the ice is reached, the i...

Embodiment 3

[0039] 1) Pour the nanoscale alumina powder into deionized water and stir evenly to obtain an alumina suspension with an alumina content of 15 wt% (mass percentage);

[0040] 2) In the alumina suspension prepared in step (1), add silica nano-powders accounting for 1wt.% of the mass of alumina, stir and disperse by ultrasonic waves to obtain a uniform sintering aid mixed with the alumina suspension. Aluminum suspension;

[0041] 3) the aluminum oxide suspension mixed with sintering aid obtained in step (2) is placed in a polytetrafluoroethylene container, and the wall thickness of the container is 5 mm, and then the polytetrafluoroethylene container is placed on a solid On the metal block (as a cold finger), the lower half of the metal block is immersed in the refrigerant, and the aluminum oxide suspension mixed with the sintering aid is directional frozen through the heat transfer of the metal block until the suspension is completely solidified. Until the ice is reached, the ...

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Abstract

The invention relates to a regulation method for a pore structure of laminated porous alumina ceramics and belongs to the field of porous ceramic materials. The method comprises the following steps: a sintering aid nano-powder is mixed into an alumina suspension, and an alumina suspension mixed with the sintering aid is obtained; the alumina suspension is fed into a polytetrafluoroethylene container with the wall thickness being 5 mm, then the container is placed on a metal block, the lower half part of the container is immersed in a refrigerant, oriented refrigeration is performed on the alumina suspension mixed with the sintering aid through heat transfer of the metal block until the suspension is frozen completely, an ice cube containing ceramic particle assemblies is dried and deiced under the conditions that the temperature is lower than subzero 18 DEG C and the pressure is lower than 600 Pa, a laminated porous alumina ceramic body is obtained and sintered, and the porous ceramics are prepared. According to the regulation method, pore structure features such as the width of laminated pores of the porous ceramics, pore wall morphology and the like can be regulated quite conveniently through selection of the category of the sintering aid and the sintering temperature, and application requirements of various fields can be met.

Description

technical field [0001] The invention relates to a method for controlling the pore wall morphology of layered porous alumina ceramics, belonging to the field of porous ceramic materials. Background technique [0002] Porous ceramics is a kind of ceramic material with a large number of penetrating and non-penetrating three-dimensional porous structures. Good biocompatibility, high specific strength, etc.) and stomatal characteristics (such as: low density, good thermal insulation, high specific surface area, low dielectric constant, good permeability, etc.) are effectively combined. At present, porous ceramics have been widely used as filter materials, thermal insulation materials, artificial bone materials, electrode materials and catalyst carriers in many fields such as purification and filtration, aerospace, biomedicine, electronic devices and energy and chemical industries. The application requirements of porous ceramics are huge, and the scope of use is still expanding, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/10C04B35/64
CPCC04B35/10C04B35/64C04B38/00C04B2235/5454C04B2235/656
Inventor 史国栋周文雅武湛君王君涵王亨利章吉力
Owner DALIAN UNIV OF TECH
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