Gradient composite Fe-Al intermetallic compound microporous filter material and preparation method thereof

Abstract

The invention discloses a gradient composite Fe-Al intermetallic compound microporous filter material and a preparation method thereof, and relates to the field of powder metallurgy preparation. Aiming at the problem that a Fe-Al filter material with high temperature corrosion resistance is difficult to prepare due to process limitation in the prior art, the invention provides the gradient composite Fe-Al intermetallic compound microporous filter material. The gradient composite Fe-Al intermetallic compound microporous filter material is characterized by comprising a matrix framework and a surface filter membrane outside the matrix framework, wherein the matrix framework is pressed and sintered prealloyed Fe-Al intermetallic compound powder; and the surface filter membrane is a mixture ofa binder, water and the prealloyed Fe-Al intermetallic compound powder which are coated on the outer surface of the matrix framework and then sintered for the second time. Therefore, the gradient composite Fe-Al intermetallic compound microporous filter material with high precision, large flux, low resistance drop, good back flushing regeneration characteristic, high strength and high temperaturecorrosion resistance is realized.

Description

technical field

[0001] The present invention relates to the field of powder metallurgy preparation, in particular to a gradient composite iron-aluminum base (hereinafter referred to as Fe-Al) intermetallic compound microporous filter material and the field of preparation thereof, and in particular to a filter material used in high temperature, high pressure and corrosive environments Gradient composite Fe-Al intermetallic compound microporous filter material and its preparation field under the working conditions of precision filtration and gas-solid separation. Background technique

[0002] High-temperature gas dust removal technology involves many industrial fields such as coal chemical industry, petrochemical industry, electric power, metallurgy, energy, etc. One of the key technologies is the development and development of new high-temperature dust removal medium materials. The research on high-temperature gas dust removal and filter materials will promote the development...

Examples

preparation example Construction

[0027] refer to figure 2 The flow chart of the present invention describes the preparation method of the gradient composite Fe-Al intermetallic compound microporous filter material of the present invention, and the concrete steps of the preparation method of the present invention include as follows:

[0028] S1. Isostatic pressing of prealloyed Fe-Al intermetallic powder

[0029] Fe-Al powder prepared from pre-alloyed Fe-Al intermetallic compound powder is filled in a mold and vibrated evenly on a vibrating platform, and then the mold is placed in a cold isostatic press for compression molding. Among them, the sieving particle size range of Fe-Al powder is -50+150 mesh, the vibration powder loading time is 30-60s (preferably 60s), the molding pressure is 150-250MPa (preferably 200MPa), and the holding time is 3-15min (preferably 5min ).

[0030] S2. Vacuum sintering the green compact formed by isostatic pressing to prepare the filter matrix

[0031] Load the furnace. Put ...

example 1

[0044] 1) Isostatic pressing. Choose -50+100 mesh pre-alloyed water atomized Fe 3 Al powder is the raw material. In order to ensure that the powder is evenly loaded, the powder is loaded and vibrated for 60S, and put into a cold isostatic press at 180MP for 5 minutes. Filter base size φ60*2000*5mm.

[0045] 2) Vacuum-confined sintering. Put the pressed tube blank filter element into the sintering boat. In order to prevent the tube blank from bending and deforming vertically, the tube blank is vertically placed in the sintering boat and flexible constraints are buried around it for vacuum high-temperature constrained sintering. The sintering process is 1h-600°C (that is, temperature rises from room temperature to 600°C within 1h), heat preservation for 0.5h, 1.5h-900°C (that is, continue to heat up to 900°C within 1.5h), heat preservation for 0.5h, 3h -1260°C (that is, continue to heat up to 1260°C within 3h), keep warm for 3h. Cool in the furnace to 500°C and then air coo...

example 2

[0049] 1) Isostatic pressing. Choose -50+100 mesh pre-alloyed water atomized Fe 3 Al powder is the raw material. In order to ensure that the powder is evenly loaded, the powder is loaded and vibrated for 30 seconds, and placed in a cold isostatic press at 150 MP for 15 minutes. Filter base size φ60*2000*5mm.

[0050] 2) Vacuum-confined sintering. Put the pressed tube blank filter element into the sintering boat. In order to prevent the tube blank from bending and deforming vertically, the tube blank is vertically placed in the sintering boat and flexible constraints are buried around it for vacuum high-temperature constrained sintering. The sintering process is 2h-500℃, heat preservation for 0.5h, 1h-800℃, heat preservation for 1h, 3h-1300℃, heat preservation for 1h. Cool in the furnace to 600°C and then air cool to room temperature to prepare the filter element matrix.

[0051]3) Coating the surface filter membrane. Choose -500 mesh pre-alloyed gas atomized Fe 3 Al pow...

technical field

[0001] The present invention relates to the field of powder metallurgy preparation, in particular to a gradient composite iron-aluminum base (hereinafter referred to as Fe-Al) intermetallic compound microporous filter material and the field of preparation thereof, and in particular to a filter material used in high temperature, high pressure and corrosive environments Gradient composite Fe-Al intermetallic compound microporous filter material and its preparation field under the working conditions of precision filtration and gas-solid separation. Background technique

[0002] High-temperature gas dust removal technology involves many industrial fields such as coal chemical industry, petrochemical industry, electric power, metallurgy, energy, etc. One of the key technologies is the development and development of new high-temperature dust removal medium materials. The research on high-temperature gas dust removal and filter materials will promote the development...

Examples

preparation example Construction

[0027] refer to figure 2 The flow chart of the present invention describes the preparation method of the gradient composite Fe-Al intermetallic compound microporous filter material of the present invention, and the concrete steps of the preparation method of the present invention include as follows:

[0028] S1. Isostatic pressing of prealloyed Fe-Al intermetallic powder

[0029] Fe-Al powder prepared from pre-alloyed Fe-Al intermetallic compound powder is filled in a mold and vibrated evenly on a vibrating platform, and then the mold is placed in a cold isostatic press for compression molding. Among them, the sieving particle size range of Fe-Al powder is -50+150 mesh, the vibration powder loading time is 30-60s (preferably 60s), the molding pressure is 150-250MPa (preferably 200MPa), and the holding time is 3-15min (preferably 5min ).

[0030] S2. Vacuum sintering the green compact formed by isostatic pressing to prepare the filter matrix

[0031] Load the furnace. Put ...

example 1

[0044] 1) Isostatic pressing. Choose -50+100 mesh pre-alloyed water atomized Fe 3 Al powder is the raw material. In order to ensure that the powder is evenly loaded, the powder is loaded and vibrated for 60S, and put into a cold isostatic press at 180MP for 5 minutes. Filter base size φ60*2000*5mm.

[0045] 2) Vacuum-confined sintering. Put the pressed tube blank filter element into the sintering boat. In order to prevent the tube blank from bending and deforming vertically, the tube blank is vertically placed in the sintering boat and flexible constraints are buried around it for vacuum high-temperature constrained sintering. The sintering process is 1h-600°C (that is, temperature rises from room temperature to 600°C within 1h), heat preservation for 0.5h, 1.5h-900°C (that is, continue to heat up to 900°C within 1.5h), heat preservation for 0.5h, 3h -1260°C (that is, continue to heat up to 1260°C within 3h), keep warm for 3h. Cool in the furnace to 500°C and then air coo...

example 2

[0049] 1) Isostatic pressing. Choose -50+100 mesh pre-alloyed water atomized Fe 3 Al powder is the raw material. In order to ensure that the powder is evenly loaded, the powder is loaded and vibrated for 30 seconds, and placed in a cold isostatic press at 150 MP for 15 minutes. Filter base size φ60*2000*5mm.

[0050] 2) Vacuum-confined sintering. Put the pressed tube blank filter element into the sintering boat. In order to prevent the tube blank from bending and deforming vertically, the tube blank is vertically placed in the sintering boat and flexible constraints are buried around it for vacuum high-temperature constrained sintering. The sintering process is 2h-500℃, heat preservation for 0.5h, 1h-800℃, heat preservation for 1h, 3h-1300℃, heat preservation for 1h. Cool in the furnace to 600°C and then air cool to room temperature to prepare the filter element matrix.

[0051]3) Coating the surface filter membrane. Choose -500 mesh pre-alloyed gas atomized Fe 3 Al pow...

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