Metal polyporous material with gradient pore structure and preparation thereof

A technology of metal porous and porous materials, which is applied in the field of metal porous materials and their preparation, can solve the problems of decreased permeability and pore diameter reduction, and achieves the effect of simple process

Inactive Publication Date: 2009-04-22
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The pore size of traditional metal porous materials is generally between 1 μm and 200 μm, and the pore size is uniformly distributed in the thickness direction (such as figure 1 and figure 2 As shown), its permeability decreases greatly with the increase of thickness, and the decrease of pore diameter also decreases greatly

Method used

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  • Metal polyporous material with gradient pore structure and preparation thereof
  • Metal polyporous material with gradient pore structure and preparation thereof
  • Metal polyporous material with gradient pore structure and preparation thereof

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Experimental program
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Effect test

Embodiment 1

[0019] Gradient porous materials consist of two layers (see image 3 ), the pore diameter of the macroporous layer is 20 μm, and the pore diameter of the finely porous layer is 1 μm. The production process is to select 100-200 mesh stainless steel powder, and form it into a metal porous tube green body with a pore size of 20 μm and a diameter of Φ50×500 mm by cold isostatic pressing. The green body is sintered in a hydrogen atmosphere at 1350 ° C to obtain a sintered metal porous material as The support body is then sprayed, dipped, or centrifugally coated to form a fine-pore layer on the inner or outer wall of the support, with a pore size of 1 μm, and the fine-pore layer is composed of powder with an average particle size of 1 μm. its microstructure see Figure 6 , and its air permeability coefficient is shown in Table 1.

Embodiment 2

[0021] Gradient porous materials consist of multilayer structures (see Figure 5 ), the pore diameter of the macroporous layer is 20 μm, and the pore diameter of the finely porous layer is 1 μm. The production process is to select 100-200 mesh stainless steel powder, and form it into a metal porous tube green body with a pore size of 20 μm and a diameter of Φ50×500 mm by cold isostatic pressing. The green body is sintered in a hydrogen atmosphere at 1350 ° C to obtain a sintered metal porous material as Support body, and then use the method of spraying or dipping, or centrifugal coating to make multi-layer fine-pore layer successively on the inner wall or outer wall of the support. 10μm, 5μm, 1μm, 0.5μm powder composition. its microstructure see Figure 7 , the properties are shown in Table 1.

Embodiment 3

[0023] Gradient porous materials consist of two layers (see image 3 ), the pore diameter of the macroporous layer is 20 μm, and the pore diameter of the finely porous layer is 1 μm. The production process is to select a five-layer composite wire mesh metal porous material with a pore size of 20 μm (for its microstructure, see Figure 6 ), its shape can be pipe, plate or sheet, etc., and then use the method of spraying or dipping, or centrifugal coating to make a layer of fine-pored layer on the outer surface of the five-layer composite screen, the aperture is 1 μm, and the fine-pored layer is Composed of powder with an average particle size of 1 μm.

[0024] Table 1 Performance comparison between traditional metal porous materials and gradient metal porous materials

[0025]

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Abstract

The invention provides a metal porous material with a gradient pore structure, which is formed by at least two porous layers with different pore diameter. The pore diameter of the metal porous material gradually decreases or gradually increases with the thickness direction of the material; a bottom layer of the porous layers is a macropore layer used as a support body; a surface layer of the porous layers is a pore layer used as a filtering precision control layer; the material of the macropore layer is a composite wire gauze, a metal fiber felt or a powder sintered metal porous material; and the material of the pore layer is superfine metal powder or superfine metal fiber. A method for preparing the metal porous material comprises a step of using spraying, dipping or centrifugal coating method to manufacture at least one pore layer on the surface of the support body. Compared with the prior metal porous material in the same grade, the metal porous material with the gradient pore structure has the advantages of obviously raising permeability coefficient, well solving the contradiction between the pore diameter and relative permeability coefficient of the metal porous material and having a simple process.

Description

technical field [0001] The invention relates to a porous metal material and a preparation method thereof, in particular to a porous metal material with a gradient pore structure and a preparation method thereof. Background technique [0002] Metal porous materials are a class of metal functional materials with obvious pore characteristics. Due to the existence of pores, they have functions such as separation and filtration, fluid penetration and distribution control, fluidization, high-efficiency combustion, enhanced mass and heat transfer, flame retardancy and explosion protection. It has been widely used in industrial processes such as metallurgical machinery, petrochemical industry, energy and environmental protection, national defense, nuclear technology, food engineering and biopharmaceuticals, and is an indispensable key material for the development of the national economy. [0003] The pore size of traditional metal porous materials is generally between 1 μm and 200 μ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C1/04
Inventor 汪强兵汤慧萍奚正平杨保军谈萍张文彦
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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