Method for preparing porous ceramic from active alumina precursor
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A technology of activated alumina and porous ceramics, used in ceramic products, applications, household appliances, etc., can solve the problems of high technology cost and serious environmental damage
Inactive Publication Date: 2015-01-28
SHANDONG UNIV OF TECH
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[0009] In order to overcome the deficiencies of existing high-strength, high-porosity porous ceramics preparation technology with high cost and serious environmental hazards, the present invention proposes the following solution: referring to the preparation technology of activated alumina in the field of catalyst carriers, adding Short ceramic fibers, dispersed evenly, add precipitant, etc. to generate precipitation; add ceramic powder and stir evenly, filter and wash; mix filter cake with organic binder evenly, form high-strength green body after molding and drying; according to needs Machining such as turning, followed by two-step atmosphere sintering in a high-temperature furnace
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Embodiment 1
[0021] The first stage: Precursor preparation. Dissolve 375g of aluminum nitrate nonahydrate in 1.5kg of water, add 7.5g of maltodextrin as a dispersant, stir and dissolve, add 90g of alumina fibers (length 2-7mm), stir for 2 hours until the fibers are completely and evenly dispersed, and obtain an aluminum nitrate solution ; Dissolve 320g of sodium metaaluminate in 1.2kg of water to obtain a precipitant solution. At room temperature, slowly add the prepared aluminum nitrate solution to the violently stirring precipitant solution, then add 200g of high-temperature alumina (pre-ground to a median particle size of 1.3μm), 20g of light magnesium oxide, and continue to Stir at room temperature for 1 hour; filter with suction until the filter cake is semi-solid, add 70ml of water to the filter cake, and drain; repeat this process for washing the filter cake 3 times.
[0022] The second stage: mixing porcelain materials, forming, drying and firing. Transfer the washed filter ...
Embodiment 2
[0027] The first stage: Precursor preparation. Dissolve 6.6kg of hydrated aluminum sulfate in 10kg of water, add 0.1kg of ammonium citrate, stir to dissolve, add 1.2kg of alumina fibers (length 2-7mm), stir for 3 hours until the fibers are completely and evenly dispersed, and obtain an aluminum sulfate solution; take 5.7 Dissolve kg of ammonium carbonate in 9 kg of water to obtain a precipitant solution; at room temperature, slowly add the prepared aluminum sulfate solution to the violently stirring precipitant solution, then add 1.6 kg of coke gemstones, 0.4 kg of quartz and 0.2 Composite porcelain powder composed of kg feldspar (pre-mixed and ground to a median particle size of 1.8 μm), continue to stir at room temperature for 1 hour; filter with suction until the filter cake is semi-solid, add 160ml of water to the filter cake, and drain; repeat washing in this way The filter cake was washed 3 times; the washed filter cake was transferred to a stainless steel plate and...
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Abstract
The invention relates to a method for preparing high-strength and high-porosity ceramic by preparing an active alumina precursor from inorganic aluminum salt, adding ceramic fibers and ceramic powder into the active alumina precursor, and carrying out filtering, washing, molding and sintering. Concretely, the method comprises the following steps of adding a dispersant and short ceramic fibers into an inorganic aluminum salt solution, carrying out uniform dispersion, adding the dispersion liquid into a precipitating agent solution to obtain precipitates, adding ceramic powder into the precipitates, carrying out filtering and washing to obtain the precursor, mixing the precursor and a binder to obtain a uniform mixture, carrying out molding and drying to obtain a high-strength green blank, carrying out machining such as turning according to demand, and carrying out two-step sintering in atmosphere, wherein in the two-step sintering, the first sintering process comprises that activated aluminum oxide in the ceramic blank is transformed into alpha-alumina in reduction atmosphere or inert gas atmosphere and simultaneously, the organic matter is transformed into carbon, and the second sintering process comprises that the carbon is oxidized and volatilized in oxidation atmosphere so that the porous ceramic is obtained. Compared with the foamed ceramic which is prepared by the prior art and has a similar cost, the foamed ceramic prepared by the method has high ceramic strength and high porosity.
Description
technical field [0001] The invention relates to the technical field of ceramic preparation. Specifically, it relates to a method for preparing an activated alumina precursor through an inorganic aluminum salt, adding ceramic fibers and ceramic powder, filtering, washing, forming, and firing to obtain high-strength, high-porosity ceramics. Background technique [0002] Porous ceramics have the characteristics of high chemical stability, low thermal conductivity, high temperature resistance, corrosion resistance, high strength and high rigidity, and have been widely used in metallurgy, chemical industry, environmental protection, energy, biology and other fields, such as fluid purification filtration, purification separation , catalyst carrier, sound absorption and shock absorption, thermal insulation materials, biomedical implant materials, wall materials and sensor materials [Wang Hui, Zeng Lingke, Zhang Haiwen, etc. Porous Ceramics-Green Functional Materials. China Ceramics...
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