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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 materials, and the cost of thin film deposition and sol-gel method is too high , it is difficult to achieve industrial application, and the anodic oxidation method is limited to metal oxide coating

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

Embodiment 1

[0023] (1) According to the mass ratio of silicon carbide powder, ceramic binder, pore-forming agent and sodium carboxymethylcellulose (CMC) solution as 10:1.1:0.4:1.4, the required amount of each raw material was weighed respectively, and It is mixed and stirred evenly and then dry-pressed to form a support body with a pressure of 5 MPa to prepare a green body with a diameter of 50 mm and a thickness of about 5 mm. The average particle size of silicon carbide particles is 150 μm, the mass concentration of sodium carboxymethylcellulose (CMC) solution is 1.5wt%, the pore-forming agent is graphite, and the binder is 65wt% potassium feldspar, 12wt% kaolin and 23wt% quartz sand ball mill mixture.

[0024] (2) The support was sintered, and the prepared green body was dried in an oven at 110 °C for 24 h, with a heating rate of 20 o C / min sintering to 1200°C, holding time is 1h.

[0025] (3) Weigh 2g of mullite fiber with a length of 1~2cm, 1.8g of aluminum silicate fiber, 2g of so...

Embodiment 2

[0033] (1) Same as steps (1) to (6) of Example 1

[0034] (2) The solvent of the coating solution is 15:35:50 according to the volume ratio of propylene glycol, ethanol, and ethylene glycol;

[0035] (3) Using 300 mesh chromatographic alumina as a binder;

[0036] (4) According to the mass ratio of silicon carbide powder, ceramic binder, and coating solution as 10:3:40, weigh the required amount of each raw material respectively, first add the coating solution into the beaker, and then add silicon carbide in turn The powder and the ceramic binder utilize magnetic stirring to obtain a uniform filter membrane slurry; in the preparation of the filter membrane slurry, the particle size of the silicon carbide powder is 23.1 μm, and the particle size of the chromatographic alumina binder is 0.1~19μm;

[0037] (5) with the step (8) of embodiment 1

[0038] (6) Dry the prepared filter material in an oven at 110°C for 12 hours, then dry it at 200°C for 10 hours, and calcinate the co...

Embodiment 3

[0041] (1) with the step (1)~(6) of embodiment 1;

[0042] (2) The solvent of the coating solution is 10:10:20:60 according to the volume ratio of triethylene glycol, glycerin, ethanol, and ethylene glycol;

[0043] (3) Aluminum hydroxide is used as a binder;

[0044] (4) According to the mass ratio of silicon carbide powder, ceramic binder, and coating liquid as 10:3:50, weigh the required amount of each raw material respectively, first add the coating liquid into the beaker, and then add silicon carbide in turn The powder and the ceramic binder are stirred by magnetic force to obtain a uniform filter membrane slurry; in the preparation of the filter membrane slurry, the particle size of the silicon carbide powder is 7.6 μm, and the particle size of the aluminum hydroxide binder is 0.1 μm. ~11μm;

[0045] (5) with the step (8) of embodiment 1

[0046] (6) Dry the prepared filter material in an oven at 110°C for 12 hours, then dry it at 200°C for 12 hours, and calcinate the...

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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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