Preparation method of gradient porous alumina ceramics

A technology of alumina ceramics and gradient porosity, which is applied in ceramic products, applications, household appliances, etc., can solve the problems of low porosity, difficult control of pore shape, poor pore distribution, etc., and achieve high porosity, good industrial application prospects, The effect of low density

Inactive Publication Date: 2012-05-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of poor pore distribution, difficult control of pore shape and low porosity in the gradient porous ceramics obtained by the existing preparation method. The present invention provides a preparation method of gradient porous alumina ceramics

Method used

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  • Preparation method of gradient porous alumina ceramics
  • Preparation method of gradient porous alumina ceramics
  • Preparation method of gradient porous alumina ceramics

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specific Embodiment approach 1

[0016] Specific embodiment one: the preparation method of gradient porous alumina ceramics in this embodiment is realized through the following steps: one, alumina powder, camphene (C 10 h 16 ) and fatty acid polycondensate are mixed and placed in a constant temperature ball mill, ball milled at 50-60°C for 20-30 hours to obtain a mixed slurry, wherein the volume ratio of alumina powder to camphene is 1:4-19, fatty acid polycondensate The quality is 1%~3% of the total mass of alumina powder and camphene, and the polycondensate of fatty acid is Texaphor963; 2. After the mold is immersed in liquid nitrogen for 1~3min, the slurry obtained in step 1 is poured into the mould, Let it stand for another 30-60 minutes, and then demould to obtain the green body, wherein the liquid nitrogen liquid level is located at 1 / 2-2 / 3 of the bottom of the mold based on the bottom surface of the mold; 3. Put the green body at room temperature and air atmosphere conditions Place it under the ground...

specific Embodiment approach 2

[0020] Embodiment 2: This embodiment differs from Embodiment 1 in that the particle size of the alumina powder in step 1 is 0.5-1 μm. Other steps and parameters are the same as those in Embodiment 1.

[0021] The alumina powder in this embodiment is a commercially available product.

specific Embodiment approach 3

[0022] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the mass purity of camphene in step 1 is greater than 97%. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

[0023] Camphene (C 10 h 16 ) is a commercially available product.

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Abstract

The invention discloses a preparation method of gradient porous alumina ceramics and relates to a preparation method of the porous alumina ceramics. The invention solves the problems of poor pore distribution, difficult control over pore shape, and low porosity of gradient porous ceramics obtained by using the prior preparation method. The preparation method of the invention comprises the following steps: firstly, mixing alumina powder, camphene and fatty acid polycondensate to obtain paste; secondly, carrying out the injection molding on the paste to obtain a blank; and thirdly, drying the blank, and then heat-treating to obtain the gradient porous alumina ceramics. In the invention, the oriented pore distribution of the gradient porous alumina ceramics is obtained by utilizing the property that the crystallization rates of the camphene are different at different temperatures; the gradient porous alumina ceramics have the advantages of controllable shape, networking communication of pores, and high porosity; the porosity of the gradient porous alumina ceramics is 71-85%, the density is 0.63-0.88 g / cm3, the compression strength is 8-35 Mpa; and the gradient porous alumina ceramics can be used in the industries of high-temperature insulation, fuel cells, filters, sound absorption and the like.

Description

technical field [0001] The invention relates to a preparation method of porous alumina ceramics. Background technique [0002] A porous ceramic is a ceramic body with a pore structure of a certain size and number. There are many kinds of porous ceramics, which can be roughly divided into porous ceramics, honeycomb ceramics, foam ceramics, corrugated ceramics, pore gradient ceramics and porous functional ceramics according to the pore-forming method and pore structure. Compared with other porous materials, porous ceramics have the advantages of good chemical stability, good mechanical strength, good stiffness, good heat resistance, low thermal expansion coefficient, low density, high porosity, etc. Batteries, filters, sound-absorbing and other fields have been widely used. [0003] Gradient porous ceramics are characterized by a large number of pores, and the pore size is distributed gradiently with the size of the material. The shape, content, pore size and distribution of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/632C04B35/638C04B35/10C04B38/00
Inventor 洪长青韩杰才张幸红杜建聪孟松鹤
Owner HARBIN INST OF TECH
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