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Preparation method of silicon carbide nano-fiber membrane

A nanofiber membrane and nanofiber technology, applied in chemical instruments and methods, separation methods, membrane technology, etc., can solve the problem of mechanical strength of ceramic fiber membrane layer and membrane base binding force, short application life and filtration accuracy. Low-level problems, to achieve the effect of easy industrial production, easy operation, and high separation precision

Active Publication Date: 2018-06-19
NANJING UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the above invention patents and documents all use ceramic fibers to adjust the pore structure of the membrane layer or as an intermediate transition layer, which cannot completely solve the problem of the mechanical strength of the ceramic fiber for the membrane layer and the bonding force of the membrane base, making its application life short and difficult to filter. low precision

Method used

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  • Preparation method of silicon carbide nano-fiber membrane
  • Preparation method of silicon carbide nano-fiber membrane
  • Preparation method of silicon carbide nano-fiber membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Add silicon carbide nanofibers with an average diameter of 0.1 μm and an aspect ratio of 50 into deionized water, and mix them uniformly by mechanical stirring. The stirring time is 0.5 h, the stirring speed is 1500 r / min, and the solid content of the film-forming solution is 0.5 wt%; then put the mixed film-making solution in an ultrasonic device for dispersion, the ultrasonic power is 50 W, and the ultrasonic time is 2 h; the silicon carbide substrate is coated by spraying method, and the porosity of the silicon carbide substrate is 30%, the average pore diameter is 60 μm, the spraying pressure is 0.2MPa, the single spraying time is 0.2 s, and the number of spraying times is 8 times; the coated silicon carbide substrate is dried in a constant temperature drying oven at a drying temperature of 40 °C. The drying time was 4 h; then the coated substrate was submerged in alumina sol for negative pressure suction, so that the pores of the substrate were filled with sol solut...

Embodiment 2

[0034] Add silicon carbide nanofibers with an average diameter of 0.2 μm and an aspect ratio of 50 into deionized water, and mix them uniformly by mechanical stirring. The stirring time is 1.25 h, the stirring speed is 1250 r / min, and the solid content of the film-forming solution is 0.5 wt%; then put the mixed film-making solution in an ultrasonic device for dispersion, the ultrasonic power is 50 W, and the ultrasonic time is 2 h; the silicon carbide substrate is coated by spraying method, and the porosity of the silicon carbide substrate is 35%, the average pore size is 50 μm, the spraying pressure is 0.3MPa, the single spraying time is 0.5 s, and the number of spraying times is 7 times; the coated silicon carbide substrate is dried in a constant temperature drying oven at a drying temperature of 45 °C. The drying time was 3 h; then the coated substrate was submerged in titanium oxide sol for negative pressure suction, so that the pores of the substrate were filled with sol s...

Embodiment 3

[0037] Add silicon carbide nanofibers with an average diameter of 0.5 μm and an aspect ratio of 25 into deionized water, and mix them uniformly by mechanical stirring. The stirring time is 2.5 h, the stirring speed is 1000 r / min, and the solid content of the film-forming solution is 2.5 wt%; then put the mixed film-making solution in an ultrasonic device for dispersion, the ultrasonic power is 250 W, and the ultrasonic time is 1 h; the silicon nitride substrate is coated by spraying, and the pores of the silicon nitride substrate The ratio is 40%, the average pore diameter is 40 μm, the spraying pressure is 0.4MPa, the single spraying time is 1 s, and the number of spraying times is 5 times; the coated silicon nitride substrate is placed in a constant temperature drying oven for drying, and the drying temperature is 50 ℃, the drying time is 2 h; then submerge the film-coated substrate in the titanium oxide sol for negative pressure suction, so that the pores of the substrate ar...

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Abstract

The invention relates to a high-performance silicon carbide nano-fiber membrane and a preparation method thereof. The preparation method comprises the following steps: adding a certain amount of silicon carbide nano-fibers into de-ionized water; stirring and carrying out ultrasonic mixing to prepare a uniform and stable membrane preparation solution; uniformly spraying the membrane preparation solution on a porous ceramic matrix by adopting a spray coating method; after drying at constant temperature, immersing the porous ceramic matrix into metal oxide sol; then carrying out negative-pressuresuction to enable a pore channel of the matrix to be fully filled with a sol solution; drying the porous ceramic matrix adsorbed with the sol again at constant temperature; finally, raising the temperature through a program and sintering to obtain the silicon carbide nano-fiber membrane. The silicon carbide nano-fiber membrane prepared by the preparation method can be effectively embedded into the surface-layer pore channel of the matrix; the binding force between the nano-fiber membrane and the porous ceramic matrix is strong. The separation membrane provided by the invention has the advantages of good thermal shock resistance, great gas flux and the like, can be used for purification treatment of industrial tail gas and has a wide application prospect in clean production of fields including cement, glass, metallurgy, energy sources and the like.

Description

technical field [0001] The invention belongs to the field of preparation of porous ceramic separation membranes, and in particular relates to a silicon carbide nanofiber membrane and a preparation method thereof. Background technique [0002] With the increasingly serious problem of air pollution and unprecedented threats to people's health, gas purification, especially thermal gas purification technology, has attracted more and more attention. Scientific researchers are constantly exploring filtration technology and filtration theory. The development of the filter material itself has also been paid more and more attention. In recent years, ceramic fiber modification and coating technology has rapidly emerged in the field of filter material research [In situ synthesis of porous silicon carbide (SiC) ceramics decorated with SiC nanowire, Journal of Americ Ceramic Society, 2007, 90(12):3759-3766 ]. Ceramic fiber modification is to add ceramic fiber materials in the process o...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D61/14B01D53/22B01J27/224B01J35/06
CPCB01D53/228B01D61/147B01D71/02B01D71/025B01D71/027B01J27/224B01J35/59
Inventor 仲兆祥李冬燕魏巍徐鹏张峰邢卫红
Owner NANJING UNIV OF TECH
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