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Method of preparing bore diameter gradient FeAl intermetallic compound homogeneity filtering membrane

A technology of intermetallic compounds and filtration membranes, applied in chemical instruments and methods, filtration separation, separation methods, etc., can solve problems such as poor structural stability of metal materials, environmental restrictions on the use of filtration membranes, poor formability and sintering performance of ceramic particles, etc. , to achieve the effect of improving anti-oxidation performance, excellent anti-oxidation performance, and improving anti-oxidation performance

Inactive Publication Date: 2008-01-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These preparation technologies often have disadvantages such as complex process, high cost, and difficulty in controlling the pore size of the filter membrane.
Compared with the preparation process, the quality of inorganic membranes is limited by the materials used to a greater extent
For metal materials, their oxidation resistance and acid and alkali corrosion resistance are often poor, which greatly restricts the use environment of the filter membrane, and the structure stability of metal materials is poor, and the service life is short. At the same time, due to hydrogen embrittlement Difficult to compound with other dense membranes
For ceramic materials, since the ceramic is a hard and brittle phase, the solid particle sintering method is used to prepare the filter membrane. The formability and sintering performance of the ceramic particles are often poor, and the energy consumption in the production process is high. At the same time, the ceramic is brittle and difficult to weld and assemble. Disadvantages limit the application of ceramic membranes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The mixed powder of Fe powder with an average particle size of 6 μm and Al powder with a particle size of 60 μm or less is used for mixing according to the composition ratio of Fe-40at.% Al, and molded under a pressure of 300 MPa to make a diameter of 32 mm and a thickness of 1 ~ 2mm sheet filter blank. Subsequently, a metal Al film and a metal Fe film were evenly plated on one side of the filter blank by magnetron sputtering, and the thicknesses of the metal Al film and the Fe film were both controlled at 4 μm. The reaction synthesis adopts a pressureless sintering process. First, the temperature is kept at 130°C for 40 minutes, and then the temperature is raised to 1000°C at a rate of 6°C / min, and the hold is held for 50 minutes; the sintering atmosphere is hydrogen; in the cooling stage, the cooling rate is controlled at 40°C / min min. The pore size gradient FeAl intermetallic compound homogeneous sheet filter membrane thus prepared has a porosity of 33% and a maximu...

Embodiment 2

[0014] The mixed powder of Fe powder with an average particle size of 10 μm and Al powder with a particle size of 20 μm or less is used for mixing according to the composition ratio of Fe-30at.% Al, and cold isostatic pressing is used to form a tubular billet with an isostatic pressure of 100 MPa. A tubular shaped filter blank with an outer diameter of 30 mm, an inner diameter of 28-29 mm and a height of 200 mm was prepared. Subsequently, a layer of metal Al film and a layer of metal Fe film were evenly plated on the outer surface of the tubular filter blank by means of ion plating, and the thicknesses of the metal Al film and the Fe film were both controlled at 10 μm. The reaction synthesis adopts a pressureless sintering process. First, the temperature is kept at 120°C for 30 minutes, and then the temperature is raised to 1300°C at a rate of 2°C / min, and the hold is kept for 40 minutes; the sintering atmosphere is vacuum, and the vacuum degree is 1×10 -1 ~1×10 -3 Pa; in the...

Embodiment 3

[0016] The mixed powder of Fe powder with an average particle size of 20 μm and Al powder with a particle size of 10 μm or less is used for mixing according to the composition ratio of Fe-35at.% Al, and cold isostatic pressing is used to form a tubular billet with an isostatic pressure of 100 MPa. A tubular shaped filter blank with an outer diameter of 30 mm, an inner diameter of 28-29 mm and a height of 200 mm was prepared. Subsequently, a layer of metal Al film and a layer of metal Fe film were uniformly coated on the outer surface of the tubular filter blank by means of thermal evaporation, and the thicknesses of the metal Al film and the Fe film were both controlled at 6 μm. The reaction synthesis adopts a pressureless sintering process. First, the temperature is kept at 120°C for 30 minutes, and then the temperature is raised to 1300°C at a rate of 2°C / min, and the hold is kept for 40 minutes; the sintering atmosphere is vacuum, and the vacuum degree is 1×10 -1 ~1×10 -3 ...

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PUM

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Abstract

The invention discloses a method for preparing aperture grads FeAl metal intermetallic compound Homogeneous filtering membrane, which adopts Fe and Al element powder of component matching and particle size matching. By the way of die pressing and isostatic cool pressing, make out platy or tubular filtering adobe, then adopts the way of magnetron sputtering, ion plating or vacuum evaporation to plate a layer of metal Al membrane and a layer of metal Fe membraqne on one surface of the filtering adobe evenly, and also adopts the way of non pressure sintering, prepare FeAl metal intermetallic compound homogeneous filtering membrane finally. The method doesn't need adding pore former during preparing process, lowers energy consumption almost without pollution. The prepared filtering membrane has good antioxidation performance, antisulfuration performance and anticorrosion performance, which increase the service life of inorganic membrane and can be widely used in strict environment field, in particular the filtering, separating, purifying and contracting in high temperature, strong corrosion and sulfuration environment filed.

Description

technical field [0001] The invention relates to a production technology for preparing filter membrane materials, in particular to a technical method for preparing a pore size gradient FeAl intermetallic compound homogeneous filter membrane through composite forming and reaction synthesis of Fe and Al element powders. Background technique [0002] The filter membrane is driven by external energy or chemical potential difference to separate, classify, purify and enrich the gas or liquid mixed with two or more components. Most of the process has no phase change, and it has high efficiency, energy saving and simple process. , less investment, less pollution and other advantages, it is widely used in various production and research departments of the national economy and the field of national defense construction. Separation membranes can be divided into inorganic membranes and organic polymer membranes according to the preparation materials. Among them, inorganic membranes have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D39/20C22C1/04B22F3/16
Inventor 贺跃辉江垚高海燕沈培智徐南平黄伯云
Owner CENT SOUTH UNIV
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