Preparation of ordered big hole porous ceramic film material

A technology of porous ceramics and ceramic powders, applied in ceramic products, applications, household appliances, etc., can solve the problems of small porosity adjustment range of porous materials, large pore size dispersion of porous materials, poor mechanical properties, etc., to ensure homogeneity Effect of isotropy, lower manufacturing cost, and less stress concentration

Active Publication Date: 2011-05-11
BEIJING AVIATION MATERIAL INST NO 1 GRP CORP CHINA AVIATION IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: first, the size dispersion of expanded polystyrene beads is large, resulting in large dispersion of pore diameters of porous materials and poor mechanical properties; this uneven pore structure cannot reduce the stress concentration inside the porous material, and may Lead to preferential fracture of vulnerable parts in porous materials, which cannot guarantee the homogeneity and isotropy of the material
Second, this centrifugal forming combined template method is limited by centrifugal equipment, and cannot prepare large components, and is limited to the production of small samples
Third, limited by the centrifugal forming method, the porosity adjustment range of porous materials is small

Method used

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Examples

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preparation example Construction

[0018] The present invention will be described in further detail below. The present invention is a method for preparing a porous material with an ordered and controllable pore structure, which is characterized in that the operation steps of the method are as follows:

[0019] (1) Prepare an aqueous adhesive solution, add one of the following substances in deionized water: polyvinyl alcohol, polyethylene glycol, sucrose, polyethylene oxide, polyvinylpyrrolidone, and prepare an aqueous solution with a percentage concentration of 0.5% to 10wt%. ;

[0020] (2) Prepare ceramic raw materials; weigh ceramic powder and adhesive aqueous solution according to the formula of ceramic materials to be prepared, and the solid phase volume fraction of ceramic raw materials is 25vol%~55vol%;

[0021] (3) Weighing dispersant and regulator; dispersant is one of the following substances or a mixture of several substances: ammonium polyacrylate, ammonium polymethacrylate, acrylic acid-acrylate bi...

Embodiment 1

[0030] Example 1: A porous alumina ceramic with a pore size of 300 μm.

[0031] The raw material is alumina powder α-Al 2 o 3 (purity is 99.99%, d50=0.46μm), Suzhou soil, calcium carbonate CaCO 3, and its ratio is 30:1.5:1. Add polyvinyl alcohol with a percentage concentration of 1 wt% into deionized water and completely dissolve it to obtain an aqueous adhesive solution. The monodisperse polystyrene microspheres adopt the particle diameter of 350 μm (the average shrinkage rate of the pore diameter is about 15%). Prepare a ceramic slurry with a solid content of about 30 vol%, and then add 1% acrylic acid-acrylate binary copolymer and tetramethylammonium hydroxide respectively. Mix by ball milling for 5 hours and pour the slurry into a container. Monodisperse polystyrene microspheres are placed in a 100-mesh sieve, and the mixed slurry is slowly poured on it, and stirred evenly with a glass rod, so that the surface of each microsphere has the same amount of slurry adhered ...

Embodiment 2

[0032] Example 2: Porous alumina ceramics with a pore size of 400 μm

[0033] The raw material is alumina powder α-Al 2 o 3 (purity is 99.99%, d50=0.46μm), Suzhou soil, calcium carbonate CaCO 3 , and its ratio is 40:2:1. Add polyethylene glycol with a percentage concentration of 2wt% in deionized water and completely dissolve it to obtain an aqueous adhesive solution. The monodisperse polystyrene microspheres adopt the particle diameter of 470 μm (the average shrinkage rate of the pore diameter is about 15%). Prepare a ceramic slurry with a solid content of about 40 vol%, and then add 2% ammonium polyacrylate and ammonia water respectively. Mix by ball milling for 10 hours and pour the slurry into a container. Monodisperse polystyrene microspheres are placed in a 60-mesh sieve, slowly pour the mixed slurry on top, and stir evenly with a glass rod, so that the same amount of slurry adhered to the surface of each microsphere (as required) Can be reapplied). Carry out natu...

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PUM

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Abstract

The invention provides a method for preparing an orderly multi-macropore ceramic material, belonging to the inorganic nonmetal material filed. The invention relates to an improvement of the method for preparing the pore structure orderly controlled macropore ceramic material. The method comprises the following steps that: a cementing compound water solution is prepared; a ceramic raw material is prepared; a dispersant and a regulator are weighed; the raw materials are mixed and ball grinded; the mixture is coated on microballoons; the mixture is dried, pressed, parched and sintered. The aperture of the multi-macropore material is monodispersed, thereby having good mechanical property. The production is realized without a centrifugal device, thereby greatly lowering the production cost. The porosity of the multi-macropore is adjusted conveniently, thereby meeting the requirement of the material with different porosities.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and relates to the improvement of the method for preparing macroporous ceramic materials with orderly and controllable pore structure. Background technique [0002] Porous lightweight structural material is an advanced composite material. The biggest difference between it and traditional materials is that it has ever-changing microstructures. Therefore, porous materials have good designability and can be fine-tuned before preparation according to the needs of different applications. Innovative configuration optimization design and multi-functional and multi-disciplinary collaborative design are carried out based on the concept structure. The porous material referred to in the present invention is: a highly ordered material in three dimensions, with millions or tens of millions of pores having uniform diameter and orderly arrangement. This kind of material can be roughly divided in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/634
Inventor 益小苏陈敬哲仝建峰王岭李宝伟黄浩华文君
Owner BEIJING AVIATION MATERIAL INST NO 1 GRP CORP CHINA AVIATION IND
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