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Support-free perforated metal film preparation method

A porous metal and support type technology, applied in the field of porous material processing, can solve the problems of high cost, complicated process, etc., and achieve the effect of solving stress release cracking, difficult forming and uncontrollable, and uniform pore size distribution.

Active Publication Date: 2013-11-13
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Compared with the symmetrical porous metal element, the asymmetric porous element significantly improves the filtration accuracy while ensuring a high flux, but due to the difference in powder particle size during the sintering process, the support and the The sintering stress between the film layers is different, resulting in different sintering shrinkage and shrinkage rate of each gradient layer, causing deformation and cracking of the material due to uneven sintering shrinkage, and the asymmetric porous metal element needs to be sintered twice, which is complex and costly. high
Due to the small particle size and mostly spherical shape of the film layer powder, the formability of the powder is poor. Conventional forming methods, such as cold isostatic pressing and molding methods, cannot realize the unsupported forming of the film layer powder. Asymmetric porous metal components Due to the limitation of the support body, it cannot be used as a catalyst carrier in the chemical industry
[0005] Up to now, there is no report on the preparation method of the unsupported porous metal membrane.

Method used

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  • Support-free perforated metal film preparation method

Examples

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Effect test

Embodiment 1

[0035] to combine figure 1 , the preparation method of the present embodiment unsupported porous metal membrane comprises the following steps:

[0036] Step 1. Put metal powder with an average particle size of 0.5 μm and 3% polyvinyl alcohol aqueous solution in a mass ratio of 1:3 into a ball mill and mix them evenly to obtain a slurry; the metal powder is preferably stainless steel powder , titanium powder, nickel powder, titanium alloy powder, nickel alloy powder or FeAl alloy powder, the metal powder that present embodiment adopts is 316L stainless steel powder;

[0037]Step 2. Use the brushing method to evenly coat the slurry described in step 1 on the surface of the substrate, and then place the substrate coated with the slurry in a drying oven to dry at a drying temperature of 60°C and a drying time of 2 hours. Cool naturally Finally, a metal film layer is formed on the surface of the substrate, and then the metal film layer is peeled off from the substrate to obtain an...

Embodiment 2

[0045] combine figure 1 , the preparation method of the present embodiment unsupported porous metal membrane comprises the following steps:

[0046] Step 1. Put metal powder with an average particle size of 0.5 μm and 3% polyvinyl alcohol aqueous solution in a mass ratio of 1:3 into a ball mill and mix them evenly to obtain a slurry; the metal powder is preferably stainless steel powder , titanium powder, nickel powder, titanium alloy powder, nickel alloy powder or FeAl alloy powder, the metal powder that present embodiment adopts is 304L stainless steel powder;

[0047] Step 2. Apply the slurry described in step 1 evenly on the surface of the substrate by casting method, and then place the substrate coated with the slurry in a drying oven to dry. The drying temperature is 70°C, the drying time is 3 hours, and it is naturally cooled. Finally, a metal film layer is formed on the surface of the substrate, and then the metal film layer is peeled off from the substrate to obtain ...

Embodiment 3

[0055] combine figure 1 , the preparation method of the present embodiment unsupported porous metal membrane comprises the following steps:

[0056] Step 1, adding metal powder with an average particle size of 12 μm and 2% polyvinyl alcohol aqueous solution in a mass ratio of 1:2 into a ball mill and ball milling to obtain a slurry; the metal powder is preferably stainless steel powder, Titanium powder, nickel powder, titanium alloy powder, nickel alloy powder or FeAl alloy powder, the metal powder that present embodiment adopts is titanium powder;

[0057] Step 2. Use the brushing method to evenly coat the slurry described in step 1 on the surface of the substrate, and then place the substrate coated with the slurry in a drying oven to dry at a drying temperature of 50°C and a drying time of 2 hours. Cool naturally Finally, a metal film layer is formed on the surface of the substrate, and then the metal film layer is peeled off from the substrate to obtain an unsupported met...

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Abstract

The invention provides a support-free perforated metal film preparation method, comprising the steps of 1, uniformly mixing metal powder and poval in a ball-milling mode to obtain slurry; 2, coating the slurry onto a basal body face, and stripping after drying to obtain a support-free metal film blank; 3, placing ceramic padding and the support-free metal film blank into a sintering die, enabling the ceramic padding to fully wrap the support-free metal film blank, and then performing processes of pre-sintering preprocessing, pre-sintering, sintering and cooling to obtain the support-free perforated metal film. The support-free perforated metal film preparation method is simple in process and low in production cost, has lower demands on production equipment, and is suitable for large-scale industrial production; and the support-free perforated metal film produced according to the preparation method is small and uniform in aperture, high in porosity, and far higher in filtering efficiency compared with a traditional metal film, and can be widely applied in industrial fields such as petroleum industry, bio-pharmaceuticals, food, beverage and water treatment.

Description

technical field [0001] The invention belongs to the technical field of porous material processing, and in particular relates to a preparation method of an unsupported porous metal membrane. Background technique [0002] Porous ceramic materials, as the earliest porous materials, have been widely used due to their good high temperature resistance and corrosion resistance. However, the thermal brittleness of ceramic materials combined with poor thermal shock resistance and pressure impact strength cannot guarantee the reliability of porous components during use, which severely limits the development of porous ceramic materials. In recent years, metal porous materials have good heat resistance and shock resistance due to their good temperature resistance and excellent mechanical properties, as well as good toughness and thermal conductivity. In addition, metal porous materials also have good processing properties and The welding performance has aroused widespread concern of do...

Claims

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Application Information

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IPC IPC(8): B22F3/11
Inventor 杨坤汤慧萍王建葛渊谈萍杨保军
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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