Method for preparing porous ceramics from hollow ceramic ball

A technology of ceramic hollow spheres and porous ceramics, which is applied in the direction of ceramic products, applications, household appliances, etc., to achieve comprehensive performance control, avoid adverse effects, and evenly distribute pores

Active Publication Date: 2014-01-08
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at many problems existing in the preparation of porous ceramics by the traditional method of adding pore-forming agents, the present invention proposes a new method for preparing porous ceramics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, Al with an average diameter of 10 μm 2 o 3 The ceramic hollow spheres are pre-fired at 1200°C to obtain ceramic hollow spheres with certain mechanical strength and sintering activity. The Al 2 o 3 The ceramic hollow ball is completely hollow inside. Use deionized water as a solvent, add acrylamide and methylenebisacrylamide, mix well, then add ammonium polyacrylate, mix well again, add concentrated ammonia water, adjust the pH value of the mixed solution to 8, and prepare a premixed solution. Among them, the mass concentration of acrylamide in the premix is ​​30%, the mass ratio of acrylamide to methylenebisacrylamide is 10:1, and the amount of ammonium polyacrylate accounts for 1% of the mass of the ceramic powder. Will Al 2 o 3 The ceramic powder is added into the premix liquid, and after ball milling, a ceramic slurry with a solid phase content of 20wt.% and a viscosity less than 1 Pa·s is prepared, and the slurry is degassed by a vacuum stirring degasse...

Embodiment 2

[0025] First, Si with an average diameter of 180 μm 3 N 4 The ceramic hollow spheres are pre-fired at 1650°C to obtain ceramic hollow spheres with certain mechanical strength and sintering activity. The Si 3 N 4 The ceramic hollow ball is completely hollow inside. Use deionized water as a solvent, add acrylamide and methylene bisacrylamide, mix well, then add ammonium polyacrylate, mix well again, add concentrated ammonia water, adjust the pH value of the mixed solution to 10, and prepare a premixed solution. Among them, the mass concentration of acrylamide in the premix is ​​10%, the mass ratio of acrylamide to methylenebisacrylamide is 30:1, and the amount of ammonium polyacrylate accounts for 4% of the mass of the ceramic powder. Si 3 N 4 The ceramic powder is added into the premix liquid, and after ball milling, a ceramic slurry with a solid phase content of 60wt.% and a viscosity less than 1Pa·s is prepared, and the slurry is degassed by a vacuum stirring degasser. ...

Embodiment 3

[0027] First, Al with an average diameter of 100 μm 2 o 3 -ZrO 2The ceramic hollow spheres are pre-fired at 1250°C to obtain ceramic hollow spheres with certain mechanical strength and sintering activity. The Al 2 o 3 -ZrO 2 The interior of the ceramic hollow ball is composed of spherical micropores. Among them, Al 2 o 3 -ZrO 2 Al in ceramic hollow spheres 2 o 3 and ZrO 2 The mass ratio is 2:1. Use deionized water as a solvent, add acrylamide and methylenebisacrylamide, mix well, then add ammonium polyacrylate, mix well again, add concentrated ammonia water, adjust the pH value of the mixed solution to 9, and prepare a premixed solution. Among them, the mass concentration of acrylamide in the premix is ​​15%, the mass ratio of acrylamide to methylene bisacrylamide is 20:1, and the amount of ammonium polyacrylate accounts for 0.5% of the mass of the ceramic powder. Will Al 2 o 3 and ZrO 2 The ceramic powder is added to the premix liquid, and after ball milling, ...

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Abstract

The invention discloses a method for preparing porous ceramics in the technical field of inorganic nonmetallic materials. The porous ceramics are prepared by taking the hollow ceramic ball as a pore forming agent and using a gel casting process. The method comprises the steps: firstly, presintering the hollow ceramic ball; then, preparing low-viscosity ceramic slurry and degassing; placing the presintered hollow ceramic ball into the prepared ceramic slurry; uniformly stirring the slurry and degassing again; then, adding tetramethylethylenediamine and an aqueous solution of ammonium persulfate; carrying out injection molding after uniformly stirring the mixture; next, placing a slurry injected mold into a drying oven to heat; demolding after the slurry is completely cured, and carrying out drying, glue ejection, sintering and other processes to finally prepare the novel porous ceramics. The porous ceramics prepared by the invention are favorable in mechanical property, controllable in pore diameter distribution and uniform in air hole distribution; in addition, the adverse effects of the traditional pore forming agent on a blank body during burning can be avoided, the shrinkage and deformation of various prepared porous ceramics can be effectively inhibited, and the comprehensive performances of the prepared porous ceramics can also be effectively controlled.

Description

technical field [0001] The invention relates to a method for preparing porous ceramics by using ceramic hollow spheres, and belongs to the technical field of preparation of inorganic non-metallic materials. Background technique [0002] Porous ceramics is a new type of inorganic non-metallic material with many pores. It has become a rapidly developing material in current material science and has broad application prospects. Among the many methods for preparing porous ceramics reported at home and abroad, the method of adding pore-forming agents has the advantages of simple process, low preparation cost and relatively easy implementation, and is an important method for preparing porous ceramics at present. In general, when porous ceramics are prepared by adding a pore-forming agent, since the density of the pore-forming agent is generally smaller than that of the ceramic raw material, and the particle size is often different, the pore-forming agent cannot be uniformly distrib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/08C04B35/622
Inventor 杨金龙吴甲民张笑妍齐飞苏振国
Owner TSINGHUA UNIV
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