Coating method of silicon carbide ceramic membrane for high-temperature filtration
A technology of silicon carbide ceramics and filter membranes, applied in the field of porous ceramics, can solve the problems of difficulty in ensuring the uniformity and integrity of the membrane, difficulty in realizing industrial application, and high cost, and achieve easy industrial production, industrial production, and good film formation Effect
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[0022] Example 1
[0023] (1) According to the mass ratio of silicon carbide powder, ceramic binder, pore former and sodium carboxymethyl cellulose (CMC) solution of 10:1.1:0.4:1.4, weigh the required amount of each raw material, and It is mixed and stirred uniformly and then dry-pressed and formed under a pressure of 5 MPa to prepare a support body with a diameter of 50 mm and a thickness of about 5 mm. The average particle size of silicon carbide particles is 150μm, the mass concentration of sodium carboxymethylcellulose (CMC) solution is 1.5wt%, the pore former is graphite, and the binder is 65wt% potassium feldspar, 12wt% kaolin and 23wt% quartz sand ball milling mixture.
[0024] (2) The support is sintered, and the prepared green body is dried in an oven at 110°C for 24 hours at a heating rate of 20 o C / min sintered to 1200℃, holding time is 1h.
[0025] (3) Weigh 2g of mullite fiber, 1.8g of aluminum silicate fiber, 2g of sodium hydroxymethylcellulose, 1g of binder with a le...
Example Embodiment
[0032] Example 2
[0033] (1) Same steps (1) ~ (6) of Example 1
[0034] (2) The volume ratio of propylene glycol, ethanol, and ethylene glycol for the coating liquid solvent is 15:35:50;
[0035] (3) Use 300 mesh chromatographic alumina as a binder;
[0036] (4) According to the mass ratio of silicon carbide powder, ceramic binder, and coating liquid of 10:3:40, weigh the required amount of each raw material, first put the coating liquid into the beaker, and then add silicon carbide in sequence The powder and ceramic binder are magnetically stirred to obtain a uniform filtration membrane slurry; in the preparation of the filtration membrane slurry, the particle size of silicon carbide powder is 23.1 μm, and the particle size of chromatography alumina binder is 0.1~19μm;
[0037] (5) Same as the step (8) of Example 1
[0038] (6) Dry the prepared filter material in an oven at 110°C for 12 hours, and then dry it at 200°C for 10 hours. The composite silicon carbide ceramic filter membran...
Example Embodiment
[0040] Example 3
[0041] (1) Same as steps (1) ~ (6) of Example 1;
[0042] (2) The solvent of the coating liquid is 10:10:20:60 by volume ratio of triethylene glycol, glycerol, ethanol and ethylene glycol;
[0043] (3) Use aluminum hydroxide as a binder;
[0044] (4) According to the mass ratio of silicon carbide powder, ceramic binder and coating liquid of 10:3:50, weigh the required amount of each raw material, first put the coating liquid into the beaker, and then add silicon carbide in turn The powder and ceramic binder are magnetically stirred to obtain a uniform filter membrane slurry; in the preparation of the filter membrane slurry, the particle size of silicon carbide powder is 7.6μm, and the particle size of aluminum hydroxide binder is 0.1 ~11μm;
[0045] (5) Same as the step (8) of Example 1
[0046] (6) Dry the prepared filter material in an oven at 110°C for 12 hours, and then dry it at 200°C for 12 hours. The composite silicon carbide ceramic filter membrane material i...
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