Method for coating surface of porous metal with film

A porous metal and membrane-coated technology, which is applied in the direction of separation methods, metal processing equipment, chemical instruments and methods, etc., can solve the problems affecting the performance of porous metal membranes, increasing procedures, and residual plugs, etc., and achieves a simple and feasible process. The effect of improving filtration precision and uniform pore distribution

Active Publication Date: 2021-04-09
WESTERN BAODE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The Chinese patents with application numbers 201410834347.6 and 200910264172.9 proposed a method of sealing the surface pores of the porous metal substrate with organic or inorganic substances, and then spraying, brushing, and suction filtering the slurry containing the metal powder of the film layer. The material is coated on the surface of the substrate, and then sintered, and finally the plugging is removed by physical or chemical means, but this method introduces impurities, which not only increases the process, but also the plugging will remain, which will affect the performance of the porous metal membrane.

Method used

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  • Method for coating surface of porous metal with film

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Experimental program
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Effect test

Embodiment 1

[0040] 1. Prepare 8% PVB ethanol solution, heat and stir until completely dissolved. Then add 8% PVB solution, plasticizer, and 316L stainless steel powder with an average particle size of 10 um into the mixing tank according to the mass ratio of 10:1:15 and stir for 30 minutes to obtain a slurry A. Then heat and dissolve PVA and water at a ratio of 1:10 and stir evenly, and add polysiloxane defoamer at a ratio of 0.05ml / L to obtain slurry B.

[0041] 2. Spray the slurry A obtained in step 1 evenly on the PP base tape coated with silicone oil through an atomizer, scrape off the excess slurry with a scraper, and then put it in an oven for drying. The drying temperature is set at 80°C. Dry for 10 minutes; then use an atomizer to evenly spray the PVA solution obtained in step 1 on the film, control the thickness to 50um, and scrape off the excess PVA solution with a scraper.

[0042] 3. Put the film blank obtained in step 2 into the oven and start heating, set the heating rate t...

Embodiment 2-4

[0045] Embodiments 2-4 are described in conjunction with a porous metal surface coating device.

Embodiment 2

[0047] 1. In a water bath at 50°C, prepare 5% PVB ethanol solution, stir evenly until completely dissolved. Then PVB solution and plasticizer were mixed in a stirring tank for 5 minutes, and finally 316L stainless steel powder with an average particle diameter of 14um was added to continue stirring for 30 minutes, wherein the ratio of PVB solution, plasticizer and powder was 10:1:13, and finally Slurry A was obtained. Then heat and dissolve PVA and water at a ratio of 1:15 and stir evenly, and add polysiloxane defoamer at a ratio of 0.06ml / L to obtain slurry B.

[0048] 2. Pour the slurry A obtained in step 1 into figure 2 In the trough A of the tooling, pour the slurry B into the trough B of the tooling. Set the speed of the base belt to 0.2m / min, open the opening in the trough A, apply the slurry evenly on the PP base belt under the action of the coating roller, scrape off the excess slurry with the scraper A; then, the film enters the first Dry in an oven, and set the o...

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Abstract

The invention discloses a method for coating the surface of porous metal with film. The method for coating the surface of the porous metal with the film comprises the following steps that 1, metal powder is mixed with a solvent, a plasticizer and a binder to form slurry A, and slurry B is prepared by using water and PVA (Polyvinyl Acetate); 2, a base band is coated with the slurry A, and after drying, the surface of the base band is coated with the slurry B; 3, a film blank is formed on the surface of the porous matrix through a cold isostatic press; and 4, demolding is conducted by using water-soluble treatment, and after drying, the porous metal film is prepared by adopting a vacuum degreasing-sintering process. According to the method for coating the surface of the porous metal with the film, the surface of a support body is directly coated with the film, the preparation process of a transition layer is omitted, the production cost is reduced, and the prepared porous film has consistent permeability with the support body, has the advantages of high precision, large flux and controllable film thickness, and can be widely applied to the fields of smoke dust removal, fine filtration and the like.

Description

technical field [0001] The invention belongs to the technical field of filtration and separation materials, and relates to a method for covering a porous metal surface with a film. Background technique [0002] Porous metal material is a structure-functional integrated material with a large number of pores inside the metal. Due to its porosity and metal structure, porous metal material has large specific surface area, excellent permeability, low density, strong damping performance, and With the advantages of mechanical processing and good conductivity, it has been widely used in the fields of separation, filtration, air distribution, noise reduction, electrochemistry, heat exchange, etc. At present, the development and application of porous metal materials at home and abroad have developed from the traditional uniform porous to porous metal membranes, especially membrane materials with a filtration accuracy of 0.1-2 μm. Compared with traditional metal porous materials, poro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/04B22F3/11B22F7/08B22F5/12B01D39/10
CPCB22F3/04B22F3/1121B22F7/08B22F5/106B01D39/10B22F1/10
Inventor 成凯王耀辉曹卜元李永利郑新立田斌
Owner WESTERN BAODE TECH CO LTD
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