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A technology of porous ceramics and al2o3, which is applied in ceramic products, applications, household appliances, etc., can solve problems such as difficult to meet the performance requirements of alumina porous ceramic filter elements, and achieve the effects of reasonable performance and price ratio, convenient operation and high production efficiency
Inactive Publication Date: 2006-05-24
SHANDONG UNIV OF TECH
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[0002] The traditional preparation technology of alumina porous ceramic filter element is to produce pores on the ceramic substrate, and often reduce the firing temperature of the green body to increase the porosity of the element. The porosity and strength of alumina porous ceramics have always been relative. Contradictory, often in production and application, especially the products of traditional production technology are difficult to meet the performance requirements of alumina porous ceramic filter elements in high temperature flue gas filtration
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Embodiment 1
[0010] The first step prepares mud: industrial alumina powder (75 μm) 70wt%, jiexiu soil 8wt%, Datong soil 6wt%, Fangzi soil 1wt%, spodumene 12wt%, cooked talc 2wt%, sodium carbonate 1wt% and Mix it with water, grind it in a ball mill for 48 hours to prepare a slurry with a fineness of 30 μm, and then grind it for use.
[0011] The second step to prepare chopped polycrystalline Al 2 o 3 Ceramic Fiber: Polycrystalline Al 2 o 3 The ceramic fibers are cut into short lengths at ratios of 1000:1, 1500:1, and 2000:1 on a chopping machine, and mixed at a ratio of 50%, 30%, and 20%, mechanically pre-dispersed, and ready for use.
[0012] The third step of grouting: adding chopped polycrystalline Al to the slurry prepared above 2 o 3 2wt% ceramic fiber, 8wt% pore enhancer, 1wt% citric acid are stirred and mixed, vacuumized, and then grouted in the model, and then the grouted body is placed in a drying box or a drying kiln. The green body is dried at a temperature of 60-100°C and ...
[0019] The preparation process of Examples 2 and 3 is basically the same as that of Example 1, and the pore diameters of the obtained products are 3 μm and 1 μm respectively.
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Abstract
The invention provides an Al 2 o 3 The preparation method of porous ceramics includes mud preparation, grouting molding and firing, and is characterized in that: 70-80wt% of alumina powder, 10-15wt% of clay, spodumene and cooked talc at a ratio of 2-18:1 Mix 4-19wt% of binder and 0.5-1wt% of mud additives with water at a mass ratio of ~2, grind in a ball mill to prepare mud, and then add chopped polycrystalline Al 2 o 3 1-10wt% of ceramic fiber, 7-15wt% of pore-enhancing agent, 0.5-1wt% of debonding agent are stirred and mixed evenly, wherein the polycrystalline Al 2 o 3 The ceramic fiber has a diameter of 4-5 μm and an aspect ratio in the range of 1000:1-2000:1, and then casts it in a mold and finally fires it. chopped polycrystalline Al 2 o 3 The amount of ceramic fiber and pore-enhancing agent can be changed according to the different strength properties and pore diameter requirements of the product. The preparation method is simple in process, convenient in operation, high in production efficiency and high in yield, and is especially suitable for large-scale industrial production. It has good performance and is suitable for the preparation of ceramic filter elements for high-temperature coal (smoke) gas filters.
Description
Technical field [0001] The present invention relates to an Al 2 o 3 The invention relates to a method for preparing porous ceramics, which belongs to the technical field of porous ceramics preparation technology. Background technique [0002] The traditional preparation technology of alumina porous ceramic filter element is to produce pores on the ceramic substrate, and often reduce the firing temperature of the green body to increase the porosity of the element. The porosity and strength of alumina porous ceramics have always been relative. Contradictory, often in production and application, especially the products of traditional production technology are difficult to meet the performance requirements of alumina porous ceramic filter elements in high temperature flue gas filtration. Contents of the invention [0003] The purpose of the present invention is to provide a production technology capable of overcoming the above-mentioned defects, capable of preparing porous c...
Claims
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Application Information
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