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Preparation method for high-gradient porous metal film

A porous metal, high gradient technology, applied in the field of metal film materials, can solve the problems of insufficient sintering, low pore gradient, easy collapse of the film layer, etc., and achieve the effect of improving the efficiency and effect of pore blocking and narrowing the particle size distribution.

Active Publication Date: 2015-04-29
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a method for preparing a high-gradient porous metal membrane in order to improve the problems that the membrane layer is prone to collapse, cracking, insufficient sintering, low pore gradient, and large mass transfer resistance in the current production process of the gradient porous metal membrane.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0019] 1) The substrate is a porous stainless steel disc with a diameter of 2 cm, a thickness of 0.15 cm, and an average pore size of 500 μm. The raw material is CaCO with an average particle size of 50 μm 3 Powder, use 6wt% polyvinyl butyral (PVB) ethanol solution as granulation binder, control gas velocity 2.0m / s, bed temperature 20°C, nozzle atomization pressure 0.2MPa, prefabrication by fluidization method Pore ​​blocking material with an average particle size of about 500 μm. Dilute HNO with pH ≥ 4 is selected as the opening reagent 3 .

[0020] 2) Combine water with preformed CaCO 3 The plugging material is mixed in a certain proportion to make a paste (absolute viscosity value is 1000-2000cP), and then the paste is brushed onto the surface of the substrate, and repeatedly applied to plug the hole, then rinse the surface with water, repeat 3 times and then bake Dry it for later use, and then spray a small amount of PVB ethanol solution to fix it

[0021] 3) Grinding...

Embodiment 2

[0027] 1) A porous stainless steel tube is used as the substrate, with an inner diameter of 8 mm, an outer diameter of 12 mm, a length of 100 mm, and an average pore diameter of the substrate of 5 μm. The raw material is Al(OH) with an average particle size of 0.5 μm 3 Powder, use 6wt% polyvinyl butyral (PVB) ethanol solution as granulation binder, control gas velocity 2.0m / s, bed temperature 20°C, nozzle atomization pressure 0.2MPa, prefabrication by fluidization method Pore ​​blocking material with an average particle size of about 5 μm. The opening reagent is NaOH solution with pH ≥ 12.

[0028] 2) Connect the porous stainless steel substrate with a vacuum pump to form a negative pressure component, place it in a fluidized pore-plugging material system for pore-plugging operation, and spray a certain amount of PVB ethanol solution to fix it.

[0029] 3) Polish the surface of the substrate with 1000-grit sandpaper to remove the plugging material on the surface.

[0030] 4...

Embodiment 3

[0035] 1) The selected substrate is a porous copper tube with an inner diameter of 10 mm, an outer diameter of 13 mm, a length of 100 mm, and an average pore diameter of the substrate of 20 μm. The selected raw material powder is 2μm ZnO, and 6wt% polyvinyl butyral (PVB) ethanol solution is used as the granulation binder, the gas velocity is controlled at 2.0m / s, the bed temperature is 20°C, and the nozzle atomization pressure is 0.2MPa, prefabricated pore blocking material with an average particle size of about 20μm by fluidization method. The reagent for opening the pores is H 2 SO 4 solution.

[0036] 2) Disperse 5g of prefabricated ZnO pore blocking material into 50ml of PVA aqueous solution, then use a circulating water pump to perform suction plugging operation on the substrate, control the suction pressure to -0.1MPa, then rinse with clean water to remove the ZnO on the surface, repeat the above operation 2 times, spray a certain amount of PVB ethanol solution on the...

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Abstract

The invention relates to a preparation method for a high-gradient porous metal film. The preparation method is characterized by comprising the steps of firstly, carrying out hole blocking treatment on a porous metal matrix by using prepared inorganic powder; then, carrying out metal powder coating; carrying out high temperature sintering under a hydrogen or inert atmosphere to obtain an impurity-containing gradient porous metal film; finally, flushing (carrying out vacuum soaking on) residual impurities in a film matrix by using a chemical reagent or removing the residual impurities in the film matrix by using an ultrasonic technology to obtain the high-gradient porous metal film. According to the high-gradient porous metal film prepared by the preparation method, the powder coating quality is good, the operation is simple and convenient, the residual impurities in a matrix pore passage is easy to be completely removed, and the obtained metal film is good in integrality, high in gradient and low in mass transfer resistance.

Description

technical field [0001] The invention relates to a preparation method of a high-gradient porous metal membrane, in particular to a metal membrane material with large pore diameter span and excellent filtering performance. Background technique [0002] Porous metal materials are widely used in petroleum, chemical, food, pharmaceutical, environmental protection, automobile, noise reduction and other fields. In particular, considering that metal materials are significantly superior to ceramic materials in terms of mechanical strength and welding performance, they are widely used in the filtration section of chemical and pharmaceutical industries. In the process of industrial application of porous metal materials, it is necessary to focus on parameters such as filtration accuracy, mass transfer resistance, and mechanical strength of the material. Ordinary porous metal materials (symmetrical porous metal materials) are greatly limited in scope of application because they cannot t...

Claims

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Application Information

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IPC IPC(8): B22F7/04
Inventor 俞健谌洪图刘强蔡毅杨佳辉黄彦
Owner NANJING UNIV OF TECH
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