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Preparation of continuous hole graded ceramic tube

A technology of ceramic tubes and continuous holes is applied in the field of preparation of continuous-pore gradient ceramic tubes, which can solve the problems of complicated and difficult manufacturing process of continuous-pore gradient ceramics and high centrifugal speed, and achieves the elimination of vacuum degassing procedures, easy operation, and centrifugal force. The effect of low speed

Active Publication Date: 2008-12-17
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] The purpose of the present invention is to provide a method for preparing a continuous-pore gradient ceramic tube in order to solve the problem that the manufacturing process of the existing continuous-pore gradient ceramic is complicated and difficult, and the general centrifugal speed is relatively high when the centrifugal forming method is adopted.

Method used

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  • Preparation of continuous hole graded ceramic tube
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The preparation method of the continuous hole gradient ceramic tube of the present invention includes batching, centrifugal gel forming, drying and sintering.

[0059] Preparation of slurry: First, add alumina powder, organic monomer HEMA and cross-linking agent MBAM, and then add TAC, and mix thoroughly by stirring to prepare a slurry with a viscosity of 100 mPa·s.

[0060] The mass ratio of slurry is: alumina powder 70%, organic monomer (HEMA) 2.5%, crosslinking agent (MBAM) 0.1%, deionized water 27%, dispersant (TAC) 0.4%.

[0061] Centrifugal gel forming: take out 20g of slurry, add catalyst tetramethylethylenediamine (TEMED) and initiator ammonium persulfate (APS) (respectively 0.005% and 0.008% of the mass of ceramic powder) to it, after stirring for 5min Inject the stainless steel centrifuge tube, install it horizontally on the self-made centrifugal forming machine and carry out centrifugal forming with the rotating speed of 5000rpm. After 5 minutes, the centrif...

Embodiment 2

[0067] First, silica powder, organic monomer NMA and cross-linking agent MBAM were added, and then TAC was added, and the slurry with a viscosity of 150 mPa·s was prepared by stirring and mixing thoroughly. The mass ratio of the slurry is: 80% of silicon oxide powder, 4% of organic monomer (NMA), 0.1% of crosslinking agent (MBAM), 15.6% of deionized water, and 0.3% of dispersant (TAC).

[0068] Centrifugal gel forming: take out 30g slurry, add catalyst TEMED and initiator APS (respectively 0.003% and 0.007% of the mass of ceramic powder) to the slurry, stir it for 2min and pour it into a stainless steel centrifuge tube, install it horizontally in a self-made Centrifugal molding is performed at a speed of 5000rpm on a centrifugal molding machine. After 5 minutes, the centrifuge tube was heated to 80°C while maintaining the centrifugation speed and kept for 50 minutes to shape the green body.

[0069] Drying: After centrifugation, dry the wet billet at 50°C for 30 hours. After ...

Embodiment 3

[0072] First, mix ceramic powder of alumina and titanium oxide, organic monomer NMA and crosslinking agent MBAM, and then add PAA-NH 4 : solution (mass fraction 30%), and a slurry with a viscosity of 85mPa·s was prepared through thorough mixing.

[0073] The mass ratio of slurry is: ceramic powder 55% (powder mass ratio: alumina / titanium dioxide = 90 / 10), organic monomer 10%, crosslinking agent 1%, deionized water 29%, dispersant 5% .

[0074] Centrifugal gel forming: take out 40g of slurry, add catalyst TEMED and initiator ammonium persulfate (0.003% and 0.007% of the mass of ceramic powder respectively) into the slurry, stir for 2min and pour into a stainless steel centrifuge tube, install it horizontally Centrifugal molding was carried out at a speed of 2000rpm on a self-made centrifugal molding machine. After 10 minutes, the centrifuge tube was heated to 80°C while maintaining the centrifugation speed and kept for 50 minutes to shape the green body.

[0075] Drying: Aft...

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Abstract

The invention relates to a preparation method of a gradient ceramic tube with continuous holes, which combines with the advantages of a centrifugal shaping method and gel-casting. Evenly distributed gel-casting suspension is poured into a pattern to carry out centrifugation and gelatinization occurs to the suspended slurry under the effect of centrifugal force and heating to realize solidification and shaping. A wet blank is demoulded, dried and sintered and the gradient ceramic tube with the continuous holes is prepared. The pore diameters of pattern tubes are distributed continuously along the radial direction of the pattern tubes, the pore diameter of an inner surface is the smallest while the bore diameter of an outer surface is the largest; besides, the inner surface is quite flat and smooth without defect, therefore, the ceramic tube can be used both in the process of microfiltration and ultrafiltration and as a good support to further paint film on the inner surface. The preparation method is simple, thus saving the vacuum degassing procedure in traditional gel-casting; the gradient ceramic tube with the continuous holes can be shaped by one step; the pattern tubes with different pore diameters can be prepared by controlling the initial grain sizes of ceramic powders; the blank has high strength and is easy to operate with high efficiency and the yield of pattern tubes is high.

Description

technical field [0001] The invention relates to a method for preparing a ceramic tube, in particular to a method for preparing a gradient ceramic tube with continuous pores. Background technique [0002] Due to its unique and excellent performance, inorganic ceramic membranes have been widely used in many fields such as environmental protection, medicine, chemical industry and food. The pore gradient refers to the regular change of the pore diameter with the thickness, so that the purpose of separation can be achieved and the requirement of saving power consumption can be achieved. In industrial applications, asymmetric membranes are generally used, that is, stepped pore gradient ceramics, whose structure consists of a support layer and a separation layer. The continuous pore gradient refers to the continuous and non-step change of the pore diameter in the thickness direction, so it is a porous ceramic with the lowest pressure loss. [0003] At present, two methods of grou...

Claims

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Application Information

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IPC IPC(8): C04B35/624
Inventor 范益群徐南平江健卢军
Owner NANJING UNIV OF TECH
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