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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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  • Summary
  • Abstract
  • Description
  • Claims
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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, Publication No. CN1414891, Publication Date 2003.04.30) discloses a kind of open porosity prepared from a mixture containing sinterable powder In this method, a certain proportion of pore-forming agent is added in the process of making the mixed liquid. Although it is removed during the sintering process, the anti-corrosion and anti-oxidation capabilities of the porous thin layer are reduced. And there is no clear expression in the patent text on the air permeability corresponding to the filtration accuracy of the material

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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preparation example Construction

[0019] The preparation method of porous composite filter tube of the present invention, specifically carries out according to the following steps:

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

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

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

Embodiment 1

[0036] Prepare a stainless steel filter tube with a pore diameter of 20 μm and a thickness of 10 mm, mix 60 parts by weight of iron-aluminum powder with an average particle size of 3 μm and 40 parts by weight of ethanol, put it into an air distribution mixing tank, and prepare a suspension liquid. The suspension was deposited layer by layer on the outer surface of the stainless steel filter tube under the atomization pressure by the gas atomization equipment, with a thickness of 200 μm. Then under a hydrogen atmosphere, the sintering temperature is 600°C, and the temperature is kept for 1 hour, which is obtained.

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

Embodiment 2

[0039]Prepare a stainless steel filter tube with a pore diameter of 150 μm and a thickness of 2 mm, mix 50 parts by weight of stainless steel powder with an average particle size of 5 μm and 50 parts by weight of ethanol, put it into an air distribution mixing tank, and prepare a suspension . The suspension was deposited layer by layer on the outer surface of the stainless steel filter tube by centrifugal spraying, 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 to obtain the composite filter tube.

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

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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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