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Porous ceramics preparation method

A technology of porous ceramics and powder, which is applied in the field of introducing flocculants to prepare porous ceramics, which can solve the problems of complex process, uneven pores of porous ceramics, and inability to achieve porous ceramics, and achieve simple molding process, low cost, and uniform pore distribution Effect

Inactive Publication Date: 2007-08-29
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The organic foam precursor method cannot achieve porous ceramics made of micron-sized pores; the pores of the porous ceramics prepared by the pore-forming agent method and the foaming method are relatively uneven. It cannot be continuously penetrated, and the foaming method is mostly closed pores; the porous ceramics prepared by the particle packing method have relatively uniform pore distribution, and can form connected pores of various pore sizes, but due to the formation of particles and the addition of bonding The whole process is relatively complicated

Method used

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  • Porous ceramics preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take about 20-23 grams of 100-200 mesh alumina powder, 8-9 grams of kaolin, 20-22 grams of feldspar powder, add 5-8 grams of ethanol solution as a defoamer, first add 55-60 grams of water and stir evenly, then Add about 100 grams of 0.3% polyacrylamide solution while stirring to make it flocculate and precipitate. And continue stirring for 5-6 minutes.

[0031] Prepare four parts of powder according to the above ratio, and change the speed to 200 rpm, 300 rpm, 400 rpm and 600 rpm. Flocculation, shaping and sintering to make samples.

[0032] Sintering: The sintering procedure is as follows

[0033] 80~500℃ 105min

[0034] 500℃ for 30min

[0035] 500~950℃ 45min

[0036] 950℃ for 60min

[0037] 950~1200℃ 25min

[0038] 1200℃ for 120min

[0039] The porosity of each sample is shown in Table 1 respectively:

[0040] Table 1 The relationship between porosity and stirring rate

[0041] Stirring rate (rev / min)

[0042] As the stirring rate increases, the po...

Embodiment 2

[0044] Take about 20-23 grams of 100-200 mesh alumina powder, 8-9 grams of kaolin, 20-22 grams of feldspar powder, add 5-8 grams of ethanol solution as a defoamer, first add 55-60 grams of water and stir evenly, then Add about 100 grams of 0.3% polyacrylamide solution while stirring to make it flocculate and precipitate. And continue stirring for 5-6 minutes. Forming, drying and sintering to make 1# sample.

[0045] Take another 20-23 grams of 200-300 mesh alumina powder, 8-9 grams of kaolin, 20-22 grams of feldspar powder, add 5-8 grams of ethanol solution as a defoamer, first add 55-60 grams of water and stir evenly, Then add about 100 grams of 0.3% polyacrylamide solution while stirring to make it flocculate and precipitate. And continue stirring for 5-6 minutes. Molding, drying and sintering make 2# sample. Sintering, sintering procedure is the same as embodiment 1

[0046] The 1# and 2# samples were made into filters for the mixture of superfine calcium carbonate and...

Embodiment 3

[0056] Take about 20~23 grams of 200~300 mesh alumina powder, 8~9 grams of kaolin, 20~22 grams of feldspar powder, add 5~8 grams of ethanol solution as defoamer, first add 55~60 grams of water and stir evenly, then Add about 100 grams of 0.3% polyacrylamide solution while stirring to make it flocculate and precipitate. After stirring for about 3-5 minutes, quickly add 5-8 grams of 30% Al(H 2 PO 4 ) 3 The solution was then stirred for about 10 seconds. Sintering, the sintering procedure is the same as embodiment 1.

[0057] This method prevents the generated bubbles from being broken due to long-term stirring, and the porosity of the porous ceramics produced can be higher than that of the porous ceramics prepared by the single flocculation method, and the average porosity can reach about 59%.

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Abstract

The invention relates to a preparation method for porous ceramic with flocculant. Wherein, stirring to aggregate the distributed ceramic powder in water phase and form the porous structure by equal depositing and stacking. The product has porosity can come up to more than 50% and unit weight about 1g / cm3 used for filter and carrier. This invention is simple and low cost.

Description

technical field [0001] The invention relates to a method for preparing ceramics, in particular to a method for introducing a flocculant to prepare porous ceramics. Background technique [0002] At present, there are many existing techniques for preparing porous ceramics, and the techniques generally include the organic foam precursor method, the method of adding pore-forming agents, the foaming method, and the particle accumulation method. The organic foam precursor method cannot achieve porous ceramics made of micron-sized pores; the pores of the porous ceramics prepared by the pore-forming agent method and the foaming method are relatively uneven. It cannot be continuously penetrated, and the foaming method is mostly closed pores; the porous ceramics prepared by the particle packing method have relatively uniform pore distribution, and can form connected pores of various pore sizes, but due to the formation of particles and the addition of bonding The whole process is rel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B35/10C04B35/622
Inventor 陈良程振民黄磊
Owner EAST CHINA UNIV OF SCI & TECH