Preparation method of hierarchical porous alumina foam ceramic comparable to aerogel
A technology of porous alumina and foam ceramics, which is applied in the field of ceramic materials, can solve the problems of high equipment cost and complicated process, and achieve the effect of fine grain size, simple process and environmental friendliness
Inactive Publication Date: 2018-09-04
TSINGHUA UNIV +1
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Problems solved by technology
Because of its ultra-high porosity and ultra-high specific surface area, airgel is considered to be the most potential lightweight material in the 21st century, but this material generally requires freeze-drying or supercritical drying, and solution immersion to reduce surface tension, so High equipment cost and complex process
Method used
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Embodiment 1
[0024] (1) Prepare a thin aluminum sol slurry with a solid phase content of 3wt%, add 0.8wt% sodium lauryl sulfate, and then adjust the pH to 8.1 with water.
[0025] (2) Utilize a mechanical mixer to stir and foam at a speed of 2000rmp for 5min to obtain a stable ceramic foam slurry, such as figure 2 Ultra stable foam shown. Dry 48h under 80% humidity environment, obtain aluminum sol foam ceramics such as image 3 and Figure 4 shown.
[0026] (3) The porosity of the prepared aluminum sol foam ceramics is 99.01%, and the specific surface area is 278.6m 2 / g.
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Abstract
The invention develops a preparation method of a hierarchical porous alumina foam ceramic comparable to aerogel. The method includes the steps of: 1) preparing nano aluminum sol particles; 2) adding asurfactant into a suspensoid of the aluminum sol particles prepared in step 1) to obtain a sol suspensoid; 3) adjusting the pH of the sol suspensoid obtained in step 2) to 4-10; 4) foaming the product obtained in step 3) by mechanical agitation to obtain an ultra-stable aluminum sol foam slurry; and 5) drying the slurry obtained in step 4) to obtain the alumina porous ceramic. The foam structurehas uniform and complete air holes, and adopts tens of microns of closed pores based first-level pores as the main body, and the pore wall has a mesoporous second-level pore structure. Compared with the existing foam ceramics, the new material has higher specific surface area and air hole rate, and is comparable to aerogel as a light heat insulation material.
Description
technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a method for preparing a hierarchically porous foamed ceramic with high surface area and ultrahigh porosity, in particular to a method for preparing a hierarchically porous alumina foamed ceramic comparable to airgel. Background technique [0002] Porous oxide ceramics combines the advantages of foam materials and oxide ceramics, and has many characteristics such as good thermal insulation performance, low density, high temperature resistance, corrosion resistance, and chemical stability under high temperature conditions. With the rapid development of modern industry, especially the progress of high technology, higher and higher requirements are put forward for the excellent comprehensive performance of inorganic materials. Because of its ultra-high porosity and ultra-high specific surface area, airgel is considered to be the most potential lightweight mater...
Claims
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IPC IPC(8): C04B28/00C04B38/10C04B40/02C04B111/40
CPCC04B28/005C04B2111/00017C04B2111/40C04B24/16C04B38/10C04B40/0281
Inventor 杨金龙霍文龙张笑妍陈雨谷席小庆王亚利
Owner TSINGHUA UNIV
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