Porous composite filter tube and preparation method thereof

A technology for filter tubes and porous materials, which is applied in the field of porous composite filter tubes. The preparation field of the porous composite filter tubes can solve the problem of reducing the anti-corrosion and anti-oxidation capabilities of porous thin layers, affecting the development and promotion of composite filter tubes, and the lack of air permeability. Clear expression and other issues to achieve the effect of convenient operation and maintenance, low resistance and high permeation flux

Inactive Publication Date: 2010-06-09
WESTERN BAODE TECH CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently developed composite metal filter tube generally adopts a multi-layer asymmetric structure, that is, there is one or more intermediate transition layers between the structural layer and the functional layer, so that the composite filter tube will undergo multiple sintering process, increase the cost of preparation, and affect the development and promotion of composite filter tubes
The invention patent of "Porous Thin Layer with Open Porosity and Its Preparation Method" (Patent No. ZL00818015.6, Publicat

Method used

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  • Porous composite filter tube and preparation method thereof
  • Porous composite filter tube and preparation method thereof
  • Porous composite filter tube and preparation method thereof

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Example Embodiment

[0019] The preparation method of the porous composite filter tube of the present invention is specifically carried out in the following steps:

[0020] Step 1: According to the powder metallurgy method, prepare a porous material matrix with a pore size of 20-150μm, with a thickness of 2-10mm, and any length and diameter;

[0021] Powder metallurgy is the process of using metal powder or alloy powder as a raw material, which is well known to those in the art, to produce metal materials, composite materials and various types of products through molding and sintering;

[0022] Step 2: According to mass percentage, weigh 30%-60% of the multi-layer powder, 70%-40% of the carrier, and 100% of the above components. Among them, the multi-layer powder is one of metal, alloy or ceramic. One or more combinations, the average particle size of the multi-layer powder is 3 μm-10 μm; the carrier is an organic solvent, such as ethanol, carbon tetrachloride, etc., and the weighed multi-layer powder is...

Example Embodiment

[0035] Example 1:

[0036] Prepare a stainless steel filter tube with a pore size of 20μm and a thickness of 10mm. Mix 60 parts by weight of iron-aluminum powder with an average particle size of 3μm and 40 parts by weight of ethanol. liquid. The suspension is deposited layer by layer on the outer surface of the stainless steel filter tube with a thickness of 200 μm under the atomization pressure through a gas atomization device. Then, in a hydrogen atmosphere, the sintering temperature is 600 DEG C, and the temperature is kept for 1 hour, and it is prepared.

[0037] After testing, the composite filter tube has a functional layer thickness of 200μm, the composite filter tube has a porosity of 40%, a filtration accuracy of 0.1μm, and a relative air permeability coefficient of 100m3 / h.m2.kPa. It can be widely used in pipeline high-temperature gas purification, coal-fired boilers, nuclear waste gas treatment, calcium carbide gas furnaces, garbage incinerators, high-temperature catal...

Example Embodiment

[0038] Example 2:

[0039] Prepare a stainless steel filter tube with a pore size of 150μm and a thickness of 2mm. Mix 50 parts by weight of stainless steel powder with an average particle size of 5μm and 50 parts by weight of ethanol, and put them into a gas mixing tank to prepare a suspension . The suspension is deposited on the outer surface of the stainless steel filter tube layer by layer through centrifugal spray, with a thickness of 100 μm. In a hydrogen atmosphere, the composite filter tube is sintered at a temperature of 1400°C and kept for 3 hours, and it is prepared.

[0040] After testing, the composite filter tube has a functional layer thickness of 100μm, the composite filter tube has a porosity of 42%, a filtration accuracy of 1μm, and a relative air permeability coefficient of 120m3 / h.m2.kPa. It can be used for liquid and gas microfiltration.

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Abstract

The invention discloses a porous composite filter tube. The filter tube comprises a tube-shaped structural layer with the thickness of 2-10mm, wherein the surface of the structural layer is provided with a functional layer with the thickness of 50-200mu m, the aperture of the structural layer is 20-150mu m, and the aperture ratio of the structural layer to the functional layer is 2.5-5. The invention also discloses a preparation method of the porous composite filter tube and the method comprises the following steps: weighting composite layer powder and carrier to prepare suspension liquid, adopting fluidization technology to distribute air and stir, then adopting heterogeneous atomization technology to ensure that the suspension liquid to perform atomization deposition or be coated on the outer surface of the matrix of porous material, sintering at 600-1400 DEG C under vacuum or hydrogen atmosphere, and keeping temperature for 1-3 hours to prepare the porous composite filter tube. The invention increases the filtration precision and permeation flux of the filtering element, overcomes the defects of ceramic porous materials and metal porous materials prepared by conventional sintering, has high strength and good filterability and breathability, has corrosion resistance, oxidation resistance and high temperature resistant, and is not easy to break.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a porous composite filter tube used in gas or liquid purification and filtration, dust removal process or dust removal system, and also relates to a preparation method of the porous composite filter tube. Background technique [0002] Filter materials mainly include sintered metal porous materials and ceramic porous materials. Among them, porous ceramics are currently the main materials for high-temperature filter elements due to their advantages of high temperature resistance and corrosion resistance. However, due to the brittleness of the product itself, poor thermal shock resistance, manufacturing level and application technology limitations, porous ceramics are installed and used under high temperature cyclic loads. It is often broken during use; the application of conventional sintered metal porous materials is greatly limited due to its susceptibility to H2S corro...

Claims

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Application Information

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IPC IPC(8): B01D39/20
Inventor 吴引江南海娟周济段庆文杨团委赵长兴宫亚红王贤青刘高建李荣
Owner WESTERN BAODE TECH CO LTD
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