Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Pure silicon carbide filtering membrane and preparation method thereof

A technology for filtering membrane layer and silicon carbide membrane, which is applied in chemical instruments and methods, membrane technology, ceramic products, etc., can solve problems such as limiting the application process of silicon carbide filter materials, difficult pore structure for backflushing and cleaning, and filter damage and failure. , to achieve the effect of easy regeneration, low cost and long service life

Active Publication Date: 2012-09-12
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
View PDF3 Cites 31 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, the most widely used silicon carbide filter materials in high-temperature gas filtration are clay and other oxides combined with SiC ceramics. The disadvantage is that the thermal conductivity is low, resulting in poor thermal shock resistance, which makes it difficult for ceramic filter materials to withstand large thermal load fluctuations; especially In the high-temperature coal gasification power generation technology (such as IGCC, PFBC), because the coal contains sodium silicate and NaCl components, the Na 2 Si 2 o 5 It will seriously corrode the oxide combined with silicon carbide filter material, resulting in the failure of the filter, but the research shows that the pure SiC ceramic material is not subject to the above corrosion, and the pure silicon carbide material can be used under high temperature oxidation and reduction atmosphere, but At present, there is little technology in the development of pure silicon carbide filter materials, and the shortcomings of the obtained products are low strength, uneven pore size distribution, low filtration efficiency, large filtration pressure drop, and difficult backflushing cleaning of the pore structure, which limits the application of silicon carbide filter materials. process

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Pure silicon carbide filtering membrane and preparation method thereof
  • Pure silicon carbide filtering membrane and preparation method thereof
  • Pure silicon carbide filtering membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 300 μm silicon carbide particles, 5 μm silicon powder, phenolic resin, and p-toluenesulfonic acid were blended in ethanol at a mass percentage ratio of 80:20:15:1, and the ethanol content accounted for 20wt% of the total amount. After mechanical stirring, ball milled for 1.5 hour to obtain a slurry, and then dry and pulverize at 80° C. to obtain a raw material composite powder. Put the above composite powder in the isostatic pressing sheath, and use mechanical vibration during filling. The isostatic pressing sheath is designed to be 2000mm long, with an inner diameter of 40mm and an outer diameter of 60mm, and then put it into a cold isostatic press. The pressurized pressure is 150MPa, the pressure is maintained for 5 minutes, and then the jacket is removed to obtain a prefabricated support body.

[0059] Blend 1.5 μm silicon carbide powder, 1.5 μm silicon powder, epoxy resin, cellulose, and p-toluenesulfonic acid in ethanol at a mass ratio of 70:15:20:10:2, and the eth...

Embodiment 2

[0066] The difference from Example 1 is:

[0067] Blend 25 μm silicon carbide particles, 10 μm silicon oxide powder, furfural resin, and p-toluenesulfonic acid in ethanol at a mass percentage ratio of 70:15:20:2. The ethanol content accounts for 30wt% of the total amount, and ball mill after mechanical stirring The slurry was obtained for 2 hours, and then dried and pulverized at 80° C. to obtain the raw material composite powder. Put the above-mentioned composite powder in the isostatic pressing sheath, and use mechanical vibration during the filling. The isostatic pressing sheath is designed to have a tube blank size of 1000mm long, 80mm inner diameter, and 100mm outer diameter, and then put it into the cold isostatic pressing machine. The pressurized pressure is 100 MPa, and the pressure is maintained for 12 minutes, and then the jacket is removed to obtain a prefabricated support body.

[0068] 0.5 μm silicon carbide powder, 0.5 μm silicon powder, phenolic resin, polyviny...

Embodiment 3

[0072] The difference from Example 1 is:

[0073] 25 μm silicon carbide particles, 5 μm silicon powder, furfural resin, and p-toluenesulfonic acid were blended in ethanol at a mass percentage ratio of 70:15:20:2, and the ethanol content accounted for 30wt% of the total amount, and ball milled for 2 hour to obtain a slurry, and then dry and pulverize at 80° C. to obtain a raw material composite powder. Put the above-mentioned composite powder in the isostatic pressing sheath, and use mechanical vibration during the filling. The isostatic pressing sheath is designed to have a tube blank size of 1000mm long, 20mm inner diameter, and 30mm outer diameter, and then put it into the cold isostatic pressing machine. The pressurized pressure is 100 MPa, and the pressure is maintained for 12 minutes, and then the jacket is removed to obtain a prefabricated support body.

[0074] 0.5 μm silicon carbide powder, 0.5 μm silicon powder, phenolic resin, polyvinyl alcohol, and oxalic acid were...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Average pore sizeaaaaaaaaaa
Average pore sizeaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of porous ceramic materials and their preparation and especially discloses a pure silicon carbide filtering membrane and a preparation method thereof. The pure silicon carbide filtering membrane has a high porosity, a low pressure drop, high strength, good thermal shock resistance and a high use temperature. The preparation method can be realized easily and can guarantee product performances. The pure silicon carbide filtering membrane comprises pure SiC, is a surface membrane layer obtained by pile-up and binding of fine SiC particles and has aperture sizes of 0.1 to 20 microns and membrane porosity of 25 to 50%. Fine SiC particles, silicon powder, a pore-forming additive and one or more organic resins as raw materials are prepared into a surface membrane layer by spraying or dipping and the surface membrane layer is dried and sintered to form the pure silicon carbide filtering membrane. The pure silicon carbide filtering membrane can be used in an oxidation atmosphere and in a reducing atmosphere, has strong acid corrosion and alkaline corrosion resistance, and can be used for various high / low temperature fluid filtering purification fields such as coal gasification chemical engineering, integrated gasification combined cycle (IGCC) and pressurized fluidized bed combustion (PFBC) coal gasification power generation, and high temperature flue gas, automobile exhaust and water purification.

Description

technical field [0001] The invention belongs to the technical field of porous ceramic materials and their preparation, and specifically relates to a pure silicon carbide filter membrane layer and a preparation method thereof. phase, has the characteristics of high porosity, low pressure drop, high strength, good thermal shock resistance, and high service temperature. The preparation method is easy to implement and can guarantee product performance. Background technique [0002] High-temperature ceramic filter materials generally work under various harsh environmental conditions. As a high-temperature ceramic filter material for gas purification, it is usually required to have: (1) High mechanical strength, high temperature resistance (300-900°C) and excellent medium corrosion resistance Performance; (2) High filtration accuracy, filtration gas velocity and low pressure drop; (3) Easy to blow back, stable operation, high filtration efficiency; (4) Good thermal stability, able...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C04B38/06C04B35/565B01D71/02B01D67/00
Inventor 张劲松田冲曹小明杨振明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products