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Porous thin film and preparation method for porous thin film

A porous film and porous technology, which is applied in the field of porous metal film and porous inorganic film, can solve the problems of reducing the formability of porous film, product defect rate and improving the product strength of porous film.

Active Publication Date: 2015-09-02
CHENGDU INTERMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the applicant has found in practice that no matter which process is used to prepare the above-mentioned unsupported porous film, the porosity of the porous film and the formability of the material and the strength of the porous film after forming are often contradictory.
In order to pursue better filtration performance, it is required to increase the porosity of the porous film, but increasing the porosity of the porous film will reduce the formability of the porous film (mainly reflected in the cracking and deformation of the material during the preparation process, and the product defect rate. Lift) and the strength of porous film products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The step of preparing porous film comprises: (1) adopting Cu net to be supporting membrane (purchasing red copper mesh), the thickness of described supporting membrane is set to 0.08 millimeter, and mesh size is set to 200 orders; (2) Particle diameter is -400 order Ni powder (purity 99.7%) with ethanol as dispersant, PVB as binding agent by adding the ratio of 3 gram PVB, 70 gram Ni powder in every 100 milliliters of ethanols to be configured into slurry; (3) The slurry is sprayed on the supporting film (the spraying amount of the slurry is to spray 500g of slurry per square meter of the supporting film) and dried at 60°C for 4 hours to make a green body; (4) segmenting the green body Type sintering, the first stage is raised from room temperature to 220°C and held for 150 minutes. The main function of this stage is to remove the residual moisture and impurities in the green body, so as to ensure that there are no other unfavorable factors causing cracking of the film d...

Embodiment 2

[0023] The preparation steps of the porous film in Example 2 and Example 1 are roughly the same, but the difference is that the third stage of sintering is heated to 1000° C. and then only kept warm for 120 minutes, so that all Cu elements in the support film do not react with Ni; Thereafter, with a concentration of 0.5mol / L FeCl 3 The solution soaks the porous film obtained in step (5) for 35 minutes so as to selectively dissolve Cu on the porous film to form three pores, and then dry the porous film to obtain a finished product. The final porous film has a thickness of 0.12mm, an average pore diameter of 17μm, a porosity of 63%, and an air permeability of 1820m 3 / m 2 ·h·kpa.

Embodiment 3

[0025] The step of preparing porous film comprises: (1) adopting 304 stainless steel nets as support film (purchase 304 stainless steel mesh), the thickness of support film is set to 0.08 millimeter, and mesh size is set to 250 orders; (2) Ni powder with a particle size of 3-5 μm and Cu powder with a particle size of -400 mesh are prepared as a mixed powder with a weight percentage of Cu of 30%, and then ethanol is used as a dispersant and PVB is used as a binder. The ratio of 3 grams of PVB and 70 grams of mixed powder is configured into a slurry; (3) the slurry is sprayed on the supporting film (the spraying amount of the slurry is to spray 400g of slurry per square meter of the supporting film) and at 60°C After drying for 4 hours, the green body is made (4). The green body is sintered in sections. The first stage is raised from room temperature to 220°C and kept for 150 minutes. The main function of this stage is to remove the residual moisture and Impurities, to ensure th...

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Abstract

The invention discloses a porous thin film and a preparation method for the porous thin film which are easy to achieve the high porosity, guarantee the possible formability in preparation and are simple and practical in preparation technology. The thickness of the porous thin film is 5-200Mum, the average pore size is 0.05-100Mum, and the porosity is 25-75%. The preparation method comprises the steps that 1, a support film is obtained, the support film is provided with a porous-shaped first material, and preliminary pores are formed in the first material; 2, a slurry is prepared, and the slurry contains a powdered second material; 3, the support film is coated with the slurry and then made into a rough-body; 4, the rough-body is sintered, reaction happens between the first material and the second material in sintering, a porous third material is generated, and meanwhile secondary pores communicated with the preliminary pores are generated; 5, the porous thin film is obtained by cooling after the sintering. Due to the fact that at least the preliminary pores and the secondary pores are contained, and therefore the high porosity of the porous thin film is each to be achieve.

Description

technical field [0001] The invention relates to a porous film and the preparation of the porous film, in particular to a porous inorganic film, especially a porous metal film. Background technique [0002] Sintered inorganic porous materials such as sintered metal porous materials and sintered ceramic porous materials are mainly used as filter materials. In a specific application, it needs to be made into a filter element of a certain shape and configuration, and then the filter element is installed in the filter device. The existing sintered inorganic porous material filter elements are basically rigid tube or plate structures. Their preparation principles are similar, that is, roughly: firstly, the raw material powder is pressed into a tube-shaped or plate-shaped green compact through a special molding die (generally using isostatic pressing technology), and then the green compact is sintered. get the product. [0003] The aforementioned tube-type or plate-type filter e...

Claims

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Application Information

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IPC IPC(8): B22F3/22B22F3/11
Inventor 高麟汪涛李波王韬
Owner CHENGDU INTERMENT TECH
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