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

Inactive Publication Date: 2013-07-10
HAINAN UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the action of gravity, it is difficult to guarantee the uniform integrity of the filter membrane prepared by the pulling method. The tape casting method can only coat small-sized flat support

Method used

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  • Coating method of silicon carbide ceramic membrane for high-temperature filtration
  • Coating method of silicon carbide ceramic membrane for high-temperature filtration
  • Coating method of silicon carbide ceramic membrane for high-temperature filtration

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[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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Abstract

The invention discloses a coating method of a silicon carbide ceramic membrane for high-temperature filtration. The method comprises the following steps: preparing an inorganic silicon carbide membrane slurry material which is stable, good in dispersibility and excellent in membrane-forming property by utilizing one or multiple solvents of glycerol, propylene glycol, ethanol, ethylene glycol and triethylene glycol; coating the filtering membrane by utilizing the air spraying technology; and performing heat treatment, thereby preparing the silicon carbide ceramic membrane which is uniform and integrated, controllable in thickness and large in size. Based on the reasonable design of a ceramic bonding agent for the filtering membrane, the chemical stability and the bonding strength of the filtering membrane are improved. The prepared silicon carbide ceramic membrane is simple in preparation process and easy in membrane-forming condition control, realizes reduction in cost and is convenient for industrialized production. The composite filtering material obtained by sintering at high temperature is suitable for the filtration purification of high-temperature fluids such as molten metal, high-temperature flue gas and the like.

Description

technical field [0001] The invention relates to a method for preparing an inorganic filter membrane, and more specifically relates to a coating method for preparing a composite silicon carbide porous ceramic filter membrane by using air spraying technology, which belongs to the field of porous ceramics. Background technique [0002] The research and application of inorganic membranes began during World War II. Countries such as Europe and the United States used inorganic membranes to enrich uranium in uranium ore. In the 1990s, the research on inorganic membranes entered the stage of mainly using gas separation and the combination of inorganic membrane separators and reactors, which brought great benefits to the traditional chemical industry, petrochemical industry, biochemical industry, pharmaceutical industry, food industry and other fields. Revolutionary change. [0003] Inorganic membranes have some advantages that traditional separation membranes cannot match: good the...

Claims

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Application Information

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IPC IPC(8): C04B41/87B01D67/00
Inventor 邓湘云白成英李建保冯家迪景亚妮李玉萍杨杰刘张敏李誉朱飘
Owner HAINAN UNIVERSITY
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