Preparation method of zirconium oxide-enhanced aluminum oxide porous ceramic with closed-pore structure

A technology of closed-cell structure and porous ceramics, applied in the field of ceramic materials, can solve the problems of affecting density and thermal conductivity, mechanical strength can not be solved well, porosity, etc. high rate effect

Inactive Publication Date: 2017-06-13
DONGGUAN JIAQIAN NEW MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fiber-reinforced porous YSZ ceramic material disclosed in the Chinese literature ("Preparation and Performance Research of Fiber-Reinforced Porous YSZ Ceramic Material", Lang Ying, Tsinghua University Engineering Doctoral Dissertation, April 2014) uses YSZ fiber, alumina fiber, Mullite fibers and aluminum silicate fibers are used to modify the strength of YSZ ceramic materials. It is found that alumina fibers can effectively increase the toughness of porous YSZ ceramic materials, but the porosity will also be affected to a certain extent, which in turn affects the density and thermal conductivity.
It can be seen from the above prior art that the mechanical strength of zirconia ceramics can be improved to varying degrees by adding alumina powder or alumina fiber, but it is still not a good solution to improve the mechanical strength of the material under the premise of ensuring high porosity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) According to the volume ratio of 2:3, slowly drop 0.05M oxalic acid aqueous solution into the 0.2M chromium oxychloride solution, stir evenly to obtain zirconium sol, and first immerse the nanoporous alumina film with a pore size of 20nm into the zirconium sol 10min, then immerse in the iridium oxide precursor solution for 10min, take it out, dry it under an infrared lamp, and then sinter at 500°C for 5h in an argon atmosphere to obtain a stable iridium oxide with a diameter of 50-300nm and a length greater than 10μm. Nanowire tetragonal zirconia powder.

[0026] (2) By weight percentage, 4% iridium oxide-stabilized nanowire tetragonal zirconia powder, 16% hollow alumina balls with a particle size of 0.5 μm and a diameter of 5 μm with a weight ratio of 1:1 , a mixture of alumina fibers with a length of 1-2mm and 0.3% of silica sol with a particle size of 20nm are mixed, and ball milled in a rolling ball mill for 4h to obtain a mixed slurry, wherein the amount of alu...

Embodiment 2

[0030] (1) According to the volume ratio of 2:3, slowly drop 0.05M oxalic acid aqueous solution into the 0.2M chromium oxychloride solution, stir evenly to obtain zirconium sol, and first immerse the nanoporous alumina film with a pore size of 20nm into the zirconium sol 10min, then immerse in the iridium oxide precursor solution for 10min, take it out, dry it under an infrared lamp, and then sinter at 500°C for 5h under an argon atmosphere to obtain a stable iridium oxide with a diameter of 50-300nm and a length greater than 10μm. Nanowire tetragonal zirconia powder.

[0031] (2) By weight percentage, 9.5% of iridium oxide-stabilized nanowire tetragonal zirconia powder, 35% of hollow alumina balls with a particle size of 0.5 μm and a diameter of 5 μm with a weight ratio of 3:1 , a mixture of alumina fibers with a length of 1-2mm and 0.5% of silica sol with a particle size of 20nm are mixed, and ball milled in a rolling ball mill for 6h to obtain a mixed slurry, wherein the am...

Embodiment 3

[0035] (1) According to the volume ratio of 2:3, slowly drop 0.05M oxalic acid aqueous solution into the 0.2M chromium oxychloride solution, stir evenly to obtain zirconium sol, and first immerse the nanoporous alumina film with a pore size of 20nm into the zirconium sol 10min, then immerse in the iridium oxide precursor solution for 10min, take it out, dry it under an infrared lamp, and then sinter at 500°C for 5h in an argon atmosphere to obtain a stable iridium oxide with a diameter of 50-300nm and a length greater than 10μm. Nanowire tetragonal zirconia powder.

[0036] (2) By weight percentage, 1.8% iridium oxide-stabilized nanowire tetragonal zirconia powder, 5% hollow alumina balls with a particle size of 0.2 μm and a diameter of 5 μm with a weight ratio of 2:1 , a mixture of alumina fibers with a length of 1-2mm and 0.2% of silica sol with a particle size of 20nm are mixed, and ball milled in a rolling ball mill for 1h to obtain a mixed slurry, wherein the amount of al...

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Abstract

The invention provides a preparation method of a zirconium oxide-enhanced aluminum oxide porous ceramic with a closed-pore structure. The preparation method comprises the following steps of mixing iridium oxide-stabilized nanometer linear square zirconium oxide powder, aluminum oxide powder containing hollow aluminum oxide spheres and aluminum oxide fiber, and a silicon dioxide sol, and performing ball milling in a ball mill, so as to obtain mixing slurry with total solid content of 7 to 45%; adding decanoic acid, cetyl sodium sulfate, octadecyl sodium sulfate or sodium lauryl sulfate powder hydrophobic modifier into the mixing slurry, using diluted hydrochloric acid to adjust the pH (potential of hydrogen) value to 3 to 9.5, mechanically stirring and foaming, injecting and molding on a gypsum board, and drying, so as to obtain a dried blank; sintering the blank at the temperature of 1300 to 1650 DEG C, so as to obtain the zirconium oxide-enhanced aluminum oxide porous ceramic with the closed-pore structure.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a preparation method of a zirconia-reinforced alumina porous ceramic with a closed-pore structure. Background technique [0002] With the advancement of science and technology, the demand for high-performance materials is also increasing. Porous ceramic materials have the characteristics of physical and chemical stability and high temperature resistance of dense ceramic materials, and also have the high specificity of porous structure itself. Surface area, high permeability, low density and low thermal conductivity, so it has good application prospects in thermal insulation, flame retardant, earthquake resistance and other fields. [0003] Yttria-stabilized zirconia has excellent mechanical strength, corrosion resistance and high temperature resistance. When pores are introduced into the yttria-stabilized zirconia ceramic material, the thermal conductivity o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/10C04B35/626C04B38/10
CPCC04B35/803C04B35/10C04B35/62605C04B38/10C04B2235/3418C04B2235/5224C04B2235/5236C04B2235/526C04B2235/5264C04B2235/528C04B2235/96C04B2235/9607
Inventor 王海燕
Owner DONGGUAN JIAQIAN NEW MATERIAL TECH CO LTD
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