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A kind of preparation method of porosity controllable nano-foam ceramics

A nano-foam and ceramic technology, which is applied in the field of preparation of nano-foam ceramics with controllable pores, can solve the problems of uncontrollable bubble size, undetermined final material performance, and influence of pore size, achieving short preparation cycle, low cost, and high-quality equipment. simple effect

Active Publication Date: 2017-11-24
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent uses an organic precursor impregnation method, but the pore size is affected by the precursor and cannot be made very small.
The foaming method produces many bubbles, most of which are through holes, but the size of the bubbles cannot be controlled, making the performance of the final material uncertain

Method used

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  • A kind of preparation method of porosity controllable nano-foam ceramics

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Experimental program
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Embodiment 1

[0024] The invention provides a method for preparing pore-controllable nano-foam ceramics, comprising the following steps (see attached figure 1 ):

[0025] 1) Add 70g Al 2 o 3 The powder and 5g of sodium silicate nanoparticles were uniformly mixed with a high-energy ball mill at a speed of 3000r / min to obtain a composite powder;

[0026] 2) Add 150 g of deionized water dissolved with 7.5 g of calcium carbonate into the composite powder, and stir at a low speed of 100 r / min to obtain a foam slurry;

[0027] 3) Pour the foam slurry into the mold and pressurize with a pressure of 100MPa to obtain a prefabricated body;

[0028] 4) Heating to 200°C to remove the foaming agent, and then sintering at 1800°C to obtain the product.

Embodiment 2

[0030] Prepared according to the steps of Example 1, the difference from Example 1 is that the speed of the high-energy ball mill in the step 1) is 2000r / min.

Embodiment 3

[0032] Prepared according to the steps of Example 1, the difference from Example 1 is that the speed of the high-energy ball mill in the step 1) is 2500r / min.

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Abstract

The invention provides a preparation method of pore controllable nano foamed ceramic. The preparation method comprises the following steps: uniformly mixing common Al2O3 powder with nano particles by using a high-energy ball mill to obtain compound powder; adding de-ionized water dissolved with a foaming agent into the compound powder and stirring at a low speed to obtain foamed slurry; pouring the foamed slurry into a mold and pressurizing to obtain a prefabricated body; heating the prefabricated body to remove a foaming agent; sintering the prefabricated body to obtain the product. With the adoption of the preparation method, the recovery rate of the solvent can be remarkably improved and energy consumption is saved. A nano material is added into a ceramic material, so that sizes of bubbles can be controlled after the material is foamed; the preparation method has the advantages of simple process, low cost, convenience for operation, no pollution and environmental friendliness and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of foam ceramics, in particular to a preparation method of nano foam ceramics with controllable pores. Background technique [0002] The development of foam ceramics began in the 1970s. It is a kind of foam with a porosity as high as 70-90% and a bulk density of only 0.3-0.6g / cm 3 , a porous ceramic product with a three-dimensional network skeleton and an interpenetrating pore structure. As a new type of inorganic non-metallic filter material, in addition to the properties of general ceramics such as high temperature resistance and corrosion resistance, it also has light weight, high porosity, large specific surface area, high strength, high temperature resistance, and corrosion resistance. Compared with traditional filters such as ceramic particle sintered body and glass fiber cloth, it not only has the advantages of simple operation, energy saving and low cost, but also filter The effect i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/02C04B35/10
Inventor 吴昊王利民陈思敏孟晓明詹耿
Owner STATE GRID CORP OF CHINA