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Method of manufacturing FeAl intermetallic compound filter material

An intermetallic compound and filter material technology is applied in the field of filter material preparation to achieve the effects of expanding the field of use, reducing pollution 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

[0003] The technical problem to be solved by the present invention is to introduce FeAl intermetallic compounds into inorganic filter materials, and provide a new process for preparing FeAl intermetallic compound filter materials by reaction synthesis of Fe and Al element powders, so as to greatly improve the resistance of inorganic filter materials. High temperature oxidation performance and anti-corrosion performance, expand the application field of filter materials, reduce energy consumption and reduce pollution at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The mixed powder of Fe powder with an average particle size of 5 μm and Al powder with a particle size of 50 μm or less is used for mixing according to the composition ratio of Fe-40at.% Al, and then molded under a pressure of 220 MPa to make a diameter of 32 mm. A sheet-shaped filter blank with a thickness of 1-2mm. 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 1000°C at a rate of 5°C / min, and the hold is held for 60 minutes; the sintering atmosphere is hydrogen; in the cooling stage, the cooling rate is controlled at 50°C / min min. The FeAl intermetallic compound sheet filter material thus prepared has a porosity of 31% and a maximum pore diameter of 1.7 μm.

Embodiment 2

[0013] Use the mixed powder of Fe powder with an average particle size of 3 μm and Al powder with a particle size of 20 μm or less, mix the ingredients according to the proportion of Fe-30at.% Al, and then use cold isostatic pressing to form a tubular billet with an isostatic pressure of 150 MPa , the outer diameter is 30mm, the inner diameter is 28-29mm, and the tubular shaped blank is 200mm high. The reaction synthesis adopts a pressureless sintering process. First, the temperature is kept at 140°C for 60 minutes, and then the temperature is raised to 1200°C at a rate of 8°C / min, and the hold is kept for 30 minutes; the sintering atmosphere is vacuum, and the vacuum degree is 1×10 -1 ~1×10 -3 Pa; in the cooling stage, the cooling rate is controlled at 20°C / min. The FeAl intermetallic compound tubular filter material thus prepared has a porosity of 35% and a maximum pore diameter of 1.1 μm.

Embodiment 3

[0015] The mixed powder of Fe powder with an average particle size of 1 μm and Al powder with a particle size of 50 μm or less is used, mixed according to the composition ratio of Fe-25at.% Al, and then molded under a pressure of 100 MPa to make a diameter of 32 mm. A sheet-shaped filter blank with a thickness of 1-2mm. The reaction synthesis adopts the pressureless sintering process. First, the temperature is kept at 120°C for 30 minutes, and then the temperature is raised to 1000°C at a rate of 1°C / min, and the hold is held for 60 minutes; the sintering atmosphere is hydrogen; in the cooling stage, the cooling rate is controlled at 50°C / min min. The FeAl intermetallic compound sheet filter material thus prepared has a porosity of 31% and a maximum pore size of 0.9 μm.

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Abstract

The invention discloses the preparation method of a FeAl IMC filtering material.A. Select the Fe powder and Al powder with grain diameter of 100 to 1Mu m, the component match is 75 to 25at per cent Fe and 25 to 75at per cent Al; B. Adopt press forming to prepare platy forming adobe, the press forming pressure is controlled between 100 to 300 Mpa, or adopt isostatic cool pressing to prepare tubular forming adobe, the isostatic pressure is controlled between 50 to 200Mpa; C. the reaction forming adopts non pressure sintering technics, firstly keep heat for 30 to 60 minutes under the temperature of 120 to 150 DEG C., then rises to 1000 to 1200 DEG C. at the rate of 1 to 10 DEG C. and keep heat for 30 to 60 minutes; the sintering atmosphere is hydrogen and cracked ammonium, or adopts vacuum sintering, the vacuum degree is 1 multiply 10 minus 1 to 1 multiply 10 to 3Pa; the cooling stage, the control cooling rate is 10 to 50 DEG C. / min. With adopting the element powder reaction forming technics to prepare filtering material, which is beneficial for controlling the pore structure performance of the filtering material, the prepare process doesn't need adding pore former and lowers energy consumption almost without pollution.

Description

technical field [0001] The invention relates to a preparation technology of a filter material, in particular to a preparation method for synthesizing a FeAl intermetallic compound filter material by reaction of Fe and Al element powders. Background technique [0002] With the help of its porous structure, the filter material separates the dispersed particles from the dispersed fluid, so as to achieve the purposes of solid-liquid separation, solid-gas separation, purification and purification, etc., and is widely used in chemical industry, metallurgy, medicine and environmental protection and other fields . Filter materials can be divided into inorganic materials and organic materials according to the preparation materials. Among them, inorganic materials are getting more and more attention because of their high thermal stability, chemical stability and mechanical stability. At present, the inorganic materials used mainly include ceramic bodies, such as alumina and glass, an...

Claims

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Application Information

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IPC IPC(8): B01D39/20C22C1/04C22C21/00C22C33/02C22C38/06B22F3/16
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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