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Method for regulating and controlling pore structure and surface property of silicon carbide film in one step

A technology for regulating silicon carbide film and surface properties, applied in chemical instruments and methods, separation methods, membrane technology, etc., can solve problems affecting efficiency, increase preparation process and preparation cycle, etc., achieve reduced preparation cost, high bending strength and pure water permeability, wide application prospects

Active Publication Date: 2022-04-12
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The membrane pore structure and surface properties greatly affect its efficiency in the process of oil-water separation and emulsion preparation, and the modification of the membrane surface increases the preparation process and production cycle.

Method used

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  • Method for regulating and controlling pore structure and surface property of silicon carbide film in one step
  • Method for regulating and controlling pore structure and surface property of silicon carbide film in one step
  • Method for regulating and controlling pore structure and surface property of silicon carbide film in one step

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation method for regulating the pore structure and surface properties of the SiC film in this embodiment, the preparation steps are as follows:

[0033] Weigh 88% SiC particles with an average particle size of 5 μm and 12% NaA(r) with an average particle size of 2 μm according to the mass ratio, put them in a ball mill jar after preliminary mixing, and ball mill at a speed of 200 rpm 2h to obtain mixed powder A; use a 60-mesh metal mesh sieve to sieve the mixed powder A after ball milling to obtain uniform mixed powder B; The mass ratio is fully mixed with the mixed powder B to obtain the mixed powder C, and then pressed into a sheet-shaped green embryo under a molding pressure of 8MPa by a dry pressing method; The heating rate was raised from room temperature to 100°C, and then raised to 1000°C at a rate of 2°C / min, and kept for 2 hours, and finally the furnace temperature was naturally lowered to room temperature to obtain a SiC film.

[0034] figure 1 It ...

Embodiment 2

[0036] Weigh 78% SiC (average particle size of 5 μm), 12% industrial grade water glass and 10% zirconia (average particle size of 1 μm) according to the mass ratio, put them in a ball mill jar after preliminary mixing, and grind at 350 rpm Milled at a speed of 1 minute for 2 hours to obtain mixed powder A; use a 100-mesh metal mesh sieve to sieve the mixed powder A after ball milling to obtain uniform mixed powder B; use a mortar to mix the PVA solution with a mass concentration of 15% Fully mixed with mixed powder B at a mass ratio of 0.03:1 to obtain mixed powder C, which was pressed into a sheet-shaped green embryo by dry pressing at a molding pressure of 8 MPa; the green embryo was placed in a precision high-temperature furnace to The heating rate was 0.5 ℃ / min from room temperature to 100 ℃, and then 2 ℃ / min to 600 ℃, and kept for 2 hours. Finally, the furnace temperature was naturally lowered to room temperature to obtain a porous SiC ceramic sheet membrane.

[0037]The ...

Embodiment 3

[0039] Weigh 78% SiC (average particle size 5 μm), 12% industrial grade water glass and 10% zirconia (average particle size 1 μm) according to the mass ratio and place them in a ball mill jar after preliminary mixing. Ball milling at a speed of 1 minute for 2 hours to obtain mixed powder A; use a 60-mesh metal mesh sieve to sieve the mixed powder A after ball milling to obtain uniform mixed powder B; use a mortar to mix the PVA solution with a mass concentration of 10% Fully mixed with mixed powder B at a mass ratio of 0.01:1 to obtain mixed powder C, which was pressed into a sheet-shaped green embryo by dry pressing at a molding pressure of 16 MPa; the green embryo was placed in a precision high-temperature furnace to The heating rate was raised from room temperature to 100 °C at a rate of 2 °C / min, and then raised to 1000 °C at a rate of 4 °C / min, and kept for 4 hours, and finally the furnace temperature was naturally lowered to room temperature to obtain a porous SiC ceramic...

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Abstract

The invention relates to a method for regulating and controlling the pore structure and the surface property of a silicon carbide film in one step, which comprises the following steps: firstly, sufficiently mixing SiC powder with a sintering aid, and then cooperatively regulating and controlling the pore structure and the surface wetting property of the SiC film by controlling the forming pressure and the sintering condition. And by controlling the amount of SiO2 generated by oxidizing SiC, in-situ reaction of the SiO2 and the sintering aid is promoted to generate neck connection, so that the sintering temperature of the SiC film can be reduced, and the strength and corrosion resistance of the silicon carbide film can be improved. The sintering degree of the SiC film is effectively controlled by regulating and controlling the forming pressure and the sintering temperature, and the method is a simple method for regulating and controlling the pore structure and the surface property of the SiC film in one step. The porosity of the prepared SiC membrane is adjustable in a range of 13%-48%, the aperture is adjustable in a range of 0.17 [mu] m-1 [mu] m, the dynamic water initial contact angle of the SiC membrane is 12.01-66.8 degrees, and the underwater oil contact angle is adjustable in a range of 120.3-155.1 degrees; the prepared SiC film has high bending strength and pure water permeability, and has wide application prospects in the fields of oil-water separation and emulsion preparation.

Description

technical field [0001] The invention belongs to the preparation of functional membrane materials in new materials, can be applied to the fields of oil-water separation and emulsion preparation, and specifically relates to a method for regulating the pore structure and surface properties of silicon carbide membranes in one step. Background technique [0002] SiC membranes have the advantages of high mechanical strength, low thermal expansion coefficient, and high permeation flux, and have great application prospects in the fields of oil-water separation and oil-water emulsion preparation. In order to reduce the production cost of SiC films, most of the existing research focuses on the in-situ reaction sintering method, and the type of sintering aids has a great influence on the sintering performance of SiC films. Membrane pore structure and surface properties have a significant impact on the separation performance. Existing research mainly focuses on post-treatment of existin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622C04B35/64C04B38/00B01D67/00B01D71/02C02F1/40C02F1/44B01D17/02
CPCB01D17/02B01D67/00B01D71/02C02F1/44C02F1/40C04B35/565C04B35/622C04B35/64C04B38/00
Inventor 邢卫红仲兆祥江倩王雅欣谢雨伶徐南平
Owner NANJING UNIV OF TECH
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