Method for preparing porous ceramic by electrostatic field and magnetic field co-inducing crystallization technique

A technology of porous ceramics and induced crystallization, which is applied in the field of material manufacturing and can solve problems such as no research results

Inactive Publication Date: 2008-09-17
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are no research results on how the polar solution crystallizes when the electrostatic field, magnetic field and temperature gradient act together on the ceramic slurry.

Method used

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  • Method for preparing porous ceramic by electrostatic field and magnetic field co-inducing crystallization technique
  • Method for preparing porous ceramic by electrostatic field and magnetic field co-inducing crystallization technique
  • Method for preparing porous ceramic by electrostatic field and magnetic field co-inducing crystallization technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Take ZrO with a particle size of 0.1 μm to 50 μm 2 The powder is added in methanol and mixed to obtain ZrO with a solid phase volume content of 40%. 2 Ceramic slurry; ZrO 2 The ceramic slurry is injected into a mold with Cu on the bottom, phenolic foam on the side, and a cuboid inner cavity. The mold is frozen in an environment with a temperature gradient of 40°C / cm, an electric field strength of 3kV / m, and a magnetic field strength of 10GT. Perpendicular to the direction of the temperature gradient, the direction of the magnetic field is consistent with the direction of the temperature gradient. After the ceramic slurry was completely frozen, the sample was taken out of the mold and dried in a vacuum environment to obtain ZrO 2 The prefabricated body of porous ceramic material is sintered at 1350°C to obtain ZrO with a layered pore shape, a porosity of 60%, a pore diameter of 0.1mm×0.5mm, and a pore direction parallel to the direction of the electric field. 2 porous...

Embodiment 2

[0064] Take Al with a particle size of 0.1 μm to 50 μm 2 o 3 The powder is added to water and mixed to obtain an Al with a solid phase volume content of 30%. 2 o 3 Ceramic slurry; Al 2 o 3 The ceramic slurry is injected into a mold with Cu on the bottom, phenolic foam on the side, and a cuboid inner cavity. The mold is frozen in an environment with a temperature gradient of 20°C / m, an electric field strength of 10kV / m, and a magnetic field strength of 0.1GT. direction, the direction of the magnetic field is consistent with the direction of the temperature gradient. After the ceramic slurry was completely frozen, the sample was taken out of the mold and dried in a vacuum environment to obtain Al 2 o 3 Porous ceramic material prefabricated body, sintered at 1400 ° C, that is, Al with circular pore shape, average pore diameter of 100 μm, and random arrangement of pores can be obtained. 2 o 3 porous ceramic material. Micrographs of the cross-section of the porous ceramic ...

Embodiment 3

[0066] Add SiC powder with a particle size of 0.1 μm to 50 μm into acetone, and mix to obtain a SiC ceramic slurry with a solid phase volume content of 55%; inject the SiC ceramic slurry with Cu on the bottom, phenolic foam on the side, and a cylinder in the inner cavity In the mold, the mold is frozen in an environment with a temperature gradient of 60°C / cm, an electric field strength of 1kV / m, and a magnetic field strength of 30GT. The direction of the electric field points from the surroundings to the center of the sample and is perpendicular to the direction of the temperature gradient. The direction of the gradient is the same. After the ceramic slurry is completely frozen, take the sample out of the mold and dry it in a vacuum environment to obtain a SiC porous ceramic material prefabricated body, which is sintered at 1500°C to obtain an elliptical pore shape with a pore diameter of 0.1mm×0.4mm , SiC porous ceramic material with the direction of the holes pointing from t...

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Abstract

The invention discloses a method for producing porous ceramic materials based on induced crystallization by electrostatic field and magnetic field. The method comprises the following steps: dissolving ceramic powder with a particle size of 0.1-50 Mum in polar solution; mixing thoroughly to obtain a ceramic slurry with a solid content of 30-70% by volume; pouring the ceramic slurry in a die that has a heat-transfer bottom and a heat-insulating side wall; freezing the die in the presence of temperature gradient, electrostatic field and magnetic field, wherein the combination of density and direction of temperature gradient, electrostatic field and magnetic field is regulated to control the pore size, pore shape and pore distribution of crystals; drying in vacuum environment after the ceramic slurry is frozen completely; removing crystals to obtain a porous ceramic material blank; and sintering the blank at 1250-1500 DEG C to obtain the porous ceramic material. The pore size, pore shape and pore distribution of the porous ceramic made by the inventive method are controlled for different use purposes.

Description

technical field [0001] The invention belongs to the technical field of material manufacturing, and relates to a preparation method of a porous ceramic material, in particular to a method for preparing a porous ceramic material by co-induced crystallization technology of an electrostatic field and a magnetic field. Background technique [0002] Porous ceramics use the pore structure and (or) surface area in the material, combined with the properties of the material itself to achieve the required physical and chemical properties such as heat, electricity, magnetism, and light, and have a wide range of applications. Depending on the specific application of porous ceramics, there are different requirements for their porous structure. For example, porous electrode materials for fuel cells require connected pores, large surface area, and ensure gas flow and electrochemical reactions; porous ceramics for sound absorption and sound insulation require materials with a pore size of 20...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/622
Inventor 赵康汤玉斐李大玉
Owner XIAN UNIV OF TECH
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