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Silicon carbide ceramic membrane and preparation method thereof

A technology of silicon carbide ceramics and silicon carbide, applied in chemical instruments and methods, separation methods, and separation of dispersed particles, can solve the problems of high sintering temperature, poor toughness, and low operating temperature, and achieve low sintering temperature and large porosity , the effect of toughness enhancement

Active Publication Date: 2015-12-09
JIANGSU JIUWU HITECH
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Problems solved by technology

[0003] To solve the problem of excessive dust emission in high-temperature flue gas, gas-solid separation equipment is required. Traditional gas-solid separation processes, such as electrostatic precipitators, bag dust collectors, and cyclone dust collectors, generally have low operating temperatures, low separation efficiency, and secondary pollution. And other shortcomings, can not meet the requirements of industrialization, with the emergence of high-performance gas-solid separation ceramic membrane, to provide a feasible new technical route to solve this problem
[0004] The preparation of silicon carbide porous materials generally has a high sintering temperature, usually above 1800 ° C, and silicon carbide materials are easily oxidized. Silicon carbide ceramics are prepared without atmosphere protection. The higher the sintering temperature, the easier it is for silicon carbide ceramic materials to be oxidized. Oxidation and high sintering temperature lead to high direct energy consumption in the production process. In addition, in some flue gas filtration processes with harsh working conditions, the silicon carbide ceramic membrane support and membrane layer will suffer from brittle fracture due to the poor toughness of the material. Phenomenon resulting in lower service life of silicon carbide ceramics

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  • Silicon carbide ceramic membrane and preparation method thereof

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preparation example Construction

[0038] Preparation of gas-solid separation membrane

[0039] The gas-solid separation membrane of this embodiment can be manufactured through the following steps: Step 1: Mix SiC aggregates, sintering aids, toughening aids, and polymer binders in a certain proportion, and then stir, ball mill, shape and heat After sintering, a silicon carbide support body is obtained; the second step is to coat the surface of the silicon carbide support body with a coating solution, and then dry and sinter to obtain a silicon carbide ceramic film.

[0040]In the first step, the polymer binder can be polyvinyl alcohol, which can be mixed with other powders to make the mixture easier to extrude. During the sintering process, the polymer binder is removed from the film The molding method is selected from extrusion molding or isostatic pressing molding. The function of stirring is to mix the SiC aggregate, sintering aid, toughening aid and binder relatively uniformly. If the stirring time is too...

Embodiment 1

[0050] Mix SiC aggregate, titanium dioxide, silicon micropowder, aluminum silicate fiber and calcium carbonate, wherein the particle size of SiC aggregate is 60 μm, and the weight in the mixed powder is 80g, titanium dioxide 4g, silicon micropowder 7g, calcium carbonate 4g, toughening aid aluminum silicate fiber 5g, also add polymer binder polyvinyl alcohol 20g in addition, after mixing powder body and stirring 0.5h, after ball milling 8h, extrusion molding obtains silicon carbide support body, carries out sintering, with Raise to 300°C at a heating rate of 2°C / min, and then rise to 600°C at a heating rate of 3°C / min. After holding for 2 hours, raise the heating rate to 1400°C at a heating rate of 4°C / min. After holding for 3 hours, cool with the furnace. Mix silicon carbide micropowder with alumina and dispersant methylcellulose binder polyvinyl alcohol and deionized water, wherein silicon carbide micropowder accounts for 15wt%, alumina accounts for 5wt%, dispersant methylcell...

Embodiment 2

[0052] Mix SiC aggregate, titanium dioxide, silicon micropowder and calcium carbonate, wherein the SiC aggregate particle size is 80 μm, and the weight in the mixed powder is 78g, titanium dioxide 5g, silicon micropowder 7g, calcium carbonate 5g, toughening aid 5g of mullite fiber, and 20g of polymer binder polyvinyl alcohol was added, and the mixed powder was stirred for 0.5h, ball milled for 6h, extruded to obtain a silicon carbide support, and sintered at a temperature of 2°C / min. The heating rate was increased to 300°C, and then raised to 600°C at a heating rate of 3°C / min. After holding for 2 hours, the heating rate was raised to 1450°C at a heating rate of 4°C / min. After holding for 3 hours, it was cooled with the furnace. Mix silicon carbide micropowder with alumina, dispersant methylcellulose, binder polyvinyl alcohol, and deionized water, wherein silicon carbide micropowder accounts for 13%, alumina accounts for 3%, and dispersant methylcellulose accounts for 3%. %, t...

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Abstract

The invention relates to a silicon carbide ceramic membrane and a preparation method thereof, belonging to the field of preparation of porous ceramic materials. The preparation method comprises the following steps: mixing SiC aggregate, a sintering aid, a toughening aid and a high-molecular binder in proportion; and then successively carrying out stirring and ball milling, molding, high temperature sintering, coating and sintering so as to obtain the porous silicon carbide ceramic membrane. The silicon carbide ceramic membrane prepared in the invention has the advantages of high porosity, great toughness, low sintering temperature, thermal shock resistance, etc., and can be widely applied to the field of high temperature gas-solid separation.

Description

technical field [0001] The invention discloses a silicon carbide ceramic membrane and a preparation method thereof, belonging to the technical field of ceramic membranes. Background technique [0002] At present, my country's atmospheric environment situation is very severe, with frequent occurrence of large-scale smog and severe PM2.5 in some cities. The problem of air pollution characterized by fine particles has become increasingly prominent, causing great harm to human health and environmental quality, and seriously restricting society sustainable economic development. The treatment of high-temperature flue gas discharged from industrial kilns such as steel, cement, electric power, and coal chemical industry has become one of the primary problems to be solved. [0003] To solve the problem of excessive dust emission in high-temperature flue gas, gas-solid separation equipment is required. Traditional gas-solid separation processes, such as electrostatic precipitators, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B41/87B01D46/54
Inventor 彭文博张桂花沈云进邓唯张建嵩张宏范克银
Owner JIANGSU JIUWU HITECH
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