CN113181782A - Preparation method of powder mesh composite porous metal film - Google Patents

Preparation method of powder mesh composite porous metal film Download PDF

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CN113181782A
CN113181782A CN202110386194.3A CN202110386194A CN113181782A CN 113181782 A CN113181782 A CN 113181782A CN 202110386194 A CN202110386194 A CN 202110386194A CN 113181782 A CN113181782 A CN 113181782A
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powder
metal film
composite porous
porous metal
mesh composite
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CN113181782B (en
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王耀辉
曹卜元
成凯
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Western Baode Technologies Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/02—Inorganic material
    • B01D71/022—Metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0001—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
    • B01D46/543—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms using membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
    • B01D67/0039—Inorganic membrane manufacture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
    • B01D67/0039—Inorganic membrane manufacture
    • B01D67/0041—Inorganic membrane manufacture by agglomeration of particles in the dry state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
    • B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis

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  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
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  • Powder Metallurgy (AREA)
  • Filtering Materials (AREA)

Abstract

The invention discloses a preparation method of a powder mesh composite porous metal film, which comprises the following steps: firstly, uniformly mixing metal powder, a plasticizer, a thickening agent and an organic solvent or deionized water according to a certain proportion to prepare high-viscosity slurry; secondly, extruding the high-viscosity slurry into a strip-shaped film blank through a slit-shaped die opening by using an extruder, conveying the strip-shaped film blank to a two-roll mill through a conveying belt, and rolling the strip-shaped powder mesh composite porous metal film blank through composite film blanks at two sides and a single-layer metal wire mesh in the middle; thirdly, laying the strip-shaped powder mesh composite porous metal film blank with alumina powder to form an isolation layer, degreasing and sintering in a hydrogen sintering furnace to obtain the powder mesh composite porous metal film. The preparation method has the advantages of simple preparation process, low cost and high efficiency, and the prepared powder mesh composite porous metal film has uniform pore size distribution, small maximum pore size and high permeability coefficient, and can be widely applied to the fields of flue gas dust removal, water body purification and the like.

Description

Preparation method of powder mesh composite porous metal film
Technical Field
The invention belongs to the technical field of filter materials, and particularly relates to a preparation method of a powder mesh composite porous metal film.
Background
The bag type flue gas dust removal filter, in particular to a high temperature resistant and corrosion resistant dust removal filter bag, is widely applied in the fields of environmental protection, thermal power plants, cement plants, metallurgical plants and the like. The current main materials of the dust-removing filter bag, such as glass fiber, Polytetrafluoroethylene and Polyphenylene Sulfide (PPS), have the highest service temperature of only 200 ℃, and cannot be applied to higher-temperature and corrosive environments. However, metal materials, especially nickel-based high-temperature alloy, Fe-Al intermetallic compound, iron-based high-temperature alloy and other materials have high temperature resistance and corrosion resistance, but the forming method of the porous metal powder generally cannot prepare the ultrathin membrane separation material, or the prepared ultrathin porous metal membrane separation material has poor toughness and is easy to break. Therefore, it is necessary to prepare a porous metal film which has high temperature resistance, corrosion resistance, certain toughness and foldable bending property.
Disclosure of Invention
The invention aims to provide a preparation method of a powder mesh composite porous metal film, which solves the problems of temperature difference resistance and easy corrosion of the existing organic film dust removal filter bag.
The technical scheme adopted by the invention is as follows: a preparation method of a powder mesh composite porous metal film comprises the following steps:
step 1, uniformly mixing a thickening agent and an organic solution or deionized water according to a mass ratio of 1: 9-20, and completely dissolving to obtain a mixed solution A;
step 2, uniformly mixing a plasticizer and the mixed solution A obtained in the step 1 according to a mass ratio of 1: 8-20 to obtain a mixed solution B;
step 3, mixing and stirring metal powder and the mixed liquid B obtained in the step 2 according to the mass ratio of 3-8: 1 to obtain a high-viscosity slurry system;
step 4, pouring the high-viscosity thick paste system obtained in the step 3 into an extruder, extruding a metal film blank with the width of 100-800 mm and the thickness of 50-500 mu m from a slit-shaped die opening, conveying the metal film blank to two roll mills, compounding a single-layer metal wire mesh with matched width between every two layers of metal film blanks, and rolling to obtain a powder mesh composite porous metal film blank;
step 5, flatly paving the powder mesh composite porous metal film blanks obtained in the step 4, putting the powder mesh composite porous metal film blanks into a hydrogen atmosphere sintering furnace to be sequentially stacked for sintering, and arranging Al between two adjacent layers of powder mesh composite porous metal film blanks through a screen mesh2O3Protecting and isolating the powder, then carrying out temperature programming, and sequentially carrying out organic matter removal and high-temperature sintering to prepare the powder mesh composite porous metal film.
The present invention is also characterized in that,
the thickening agent in the step 1 is one of polyvinyl butyral, polyvinyl alcohol or carboxymethyl cellulose, and the organic solution is one of ethanol, isopropanol, butanol or butanone.
The plasticizer in the step 2 is one of dibutyl phthalate, glycerol or dioctyl phthalate.
The metal powder in step 3 is made of 304 stainless steel, 316L stainless steel, 310s stainless steel and Fe3One of Al alloy powder, nickel-based high-temperature alloy, iron-based high-temperature alloy, copper powder, nickel powder or titanium powder, wherein the granularity of the metal powder is less than or equal to 25 mu m.
The specification size of the slit-type die opening in step 4 is 100mm × 50 μm, 300mm × 200 μm, 800mm × 500 μm, 800mm × 200 μm, or 500mm × 500 μm.
In step 4, the material of the single-layer wire mesh is one of 304 stainless steel, 316L stainless steel, Cu, FeCrAl or 310S stainless steel.
And 4, the mesh number of the single-layer wire mesh in the step 4 is 20-300 meshes.
And (4) controlling the rolling force of the two rolling mills to be 30-100T in the step 4.
Al in step 52O3The mesh number of (2) is 60 meshes.
In the step 5, the temperature for removing the organic matters is 500-550 ℃, and the temperature is kept for 120-180 min; the temperature of high-temperature sintering is 980-1150 ℃, and the temperature is kept for 40-60 min.
The invention has the beneficial effects that:
1. the powder mesh composite porous metal film prepared by compositely sintering the single-layer metal wire mesh and the metal powder has higher filtering precision and stronger tensile strength, and can be processed into a tubular or plate-shaped structure according to the working condition requirement;
2. the powder mesh composite porous metal film prepared by the method has the advantages of uniform and complete surface, low defect rate and good product performance;
3. the powder mesh composite porous metal film prepared by the invention has uniform aperture and good air permeability, and is far superior to the traditional porous metal material;
4. the porous metal membrane separation material has low production cost, can be used for large-scale mass production, replaces the traditional multilayer metal wire mesh composite filter material, and can be widely applied to the industrial fields of flue gas dust removal, water body purification and the like.
Drawings
FIG. 1 is a process flow diagram of a method for preparing a powder mesh composite porous metal film according to the present invention;
FIG. 2 shows Al in the method for preparing a powder mesh composite porous metal film according to the present invention2O3Schematic diagram of laying mode of the isolation layer;
FIG. 3 is a surface partial magnified electron microscope photograph of a powder mesh composite porous metal film prepared by a method of preparing a powder mesh composite porous metal film according to the present invention;
FIG. 4 is a sectional partial electron microscope photomicrograph of the powder mesh composite porous metal film prepared by the method of the present invention.
In the figure, 1, an extruder, 2, a conveyor belt, 3, a two-roll mill, 4, a single-layer wire mesh, 5, a powder mesh composite porous metal film blank, 6, Al2O3An isolation layer.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a preparation method of a powder mesh composite porous metal film, as shown in figure 1, metal powder is added into a mixture added with a plasticizer, a thickening agent, an organic solution or deionized water, and is stirred and dispersed to prepare a high-viscosity slurry system. Pouring the prepared high-viscosity slurry system into an extruder 1 with a slit die opening arranged at the head, extruding a film from the head, transferring the film to a two-roll mill 3 through a conveyor belt 2, compounding two metal film blanks into a single-layer metal wire mesh 4 through compounding the films at two sides, compounding the film blanks and the metal wire mesh through compounding rolling to form an integral symmetrical film structure, namely a powder mesh composite porous metal film blank 5, and degreasing and sintering to prepare the powder mesh composite porous metal film with uniform aperture and controllable thickness. The method specifically comprises the following steps:
step 1, uniformly mixing a thickening agent and an organic solution or deionized water according to a mass ratio of 1: 9-20, and completely dissolving to obtain a mixed solution A; wherein, the thickening agent is preferably one of polyvinyl butyral, polyvinyl alcohol or carboxymethyl cellulose, and the organic solution is preferably one of ethanol, isopropanol, butanol or butanone;
step 2, uniformly mixing a plasticizer and the mixed solution A obtained in the step 1 according to a mass ratio of 1: 8-20 to obtain a mixed solution B; wherein, the plasticizer is preferably one of dibutyl phthalate, glycerol or dioctyl phthalate;
step 3, mixing and stirring metal powder and the mixed liquid B obtained in the step 2 according to the mass ratio of 3-8: 1 to obtain a high-viscosity slurry system; the material of the metal powder is preferably 304 stainless steel, 316L stainless steel, 310s stainless steel, or Fe3One of Al alloy powder, nickel-based high-temperature alloy, iron-based high-temperature alloy, copper powder, nickel powder or titanium powder, wherein the granularity of the metal powder is less than or equal to 25 mu m;
step 4, pouring the high-viscosity thick slurry system obtained in the step 3 into an extruder, extruding a metal film blank with the width of 100-800 mm and the thickness of 50-500 microns from a slit-shaped die opening, wherein the slit-shaped knife opening is provided with a plurality of dies with different sizes, such as 100mm multiplied by 50 microns, 300mm multiplied by 200 microns, 800mm multiplied by 500 microns, 800mm multiplied by 200 microns, 500mm multiplied by 500 microns and other dies with various specifications, conveying the dies to a two-roll mill, controlling the rolling force to be 30-100T, compounding a single-layer metal wire mesh with the matched width between each two layers of metal film blanks, wherein the single-layer metal wire mesh is made of one of 304 stainless steel, 316L stainless steel, Cu, FeCrAl or 310S stainless steel, and the mesh number of the single-layer metal wire mesh is 20-300 meshes, and rolling to prepare a powder mesh compound porous metal film blank;
step 5, as shown in fig. 2, flatly laying the powder mesh composite porous metal film blanks obtained in the step 4, putting the powder mesh composite porous metal film blanks into a hydrogen atmosphere sintering furnace to be sequentially stacked for sintering, and arranging 60-mesh Al between two adjacent layers of powder mesh composite porous metal film blanks through a screen mesh2O3Powder to protect the insulation, i.e. Al2O3Carrying out temperature programming on the isolating layer 6, and sequentially carrying out organic matter removal and high-temperature sintering to prepare the powder mesh composite porous metal film, wherein the temperature for removing the organic matters is 500-550 ℃, and the temperature is kept for 120-180 min; the temperature of high-temperature sintering is 980-1150 ℃, and the temperature is kept for 40-60 min.
Through the mode, the preparation method of the powder mesh composite porous metal film is low in manufacturing cost, and the prepared powder mesh composite porous metal film is large in permeation flux, flexible, foldable and high in tensile strength.
Example 1
1. Preparing a PVB ethanol solution according to the mass ratio of 1:15, aging for 24h, and stirring and mixing glycerol and the PVB ethanol solution according to the mass ratio of 1:20 to obtain a mixed liquid.
2. Fe with an average particle size of 15 μm3Mixing Al alloy powder and the mixed liquid according to the mass ratio of 5:1, slowly adding metal powder, and stirring to obtain a viscous slurry system;
3. pouring the viscous slurry system into two extruders, extruding a film blank from a slit die orifice with the size of 300mm multiplied by 200 mu m under the pushing of a screw rod, and slowly conveying a conveyor belt to two roll mills; placing a 60-mesh FeCrAl single-layer silk screen with the width of 350mm from the top of the middle part, compounding film blanks at two sides under the action of a rolling force of 30T, and accurately matching the rotating speed of a roller with a conveyor belt to prepare a powder mesh composite porous metal film blank;
4. cutting the powder mesh composite porous metal film blank into strips of 2000mm multiplied by 300mm, laying the film blank on a plate-type material rack, and arranging 60-mesh Al on a screen mesh2O3Powder isolating layer, spreading film blank, and circulating spreading in sequence;
5. and (3) loading the material frame of the laid film blank into a hydrogen atmosphere sintering furnace, heating to 500 ℃ at the speed of 5 ℃/min, preserving heat for 180min to remove organic matters, heating to 1000 ℃ at the speed of 10 ℃/min, preserving heat for 50min to form a sintering trap among the metal powder, and preserving heat to obtain the powder mesh composite porous metal film.
As shown in fig. 3 and 4, the enlarged photographs of the surface and the cross-section of the powder mesh composite porous metal thin film prepared in this example 1 measured by an electron microscope show that the pore size distribution is uniform and the porosity is high. The maximum pore diameter of the powder-mesh composite porous metal film of the embodiment is 9 μm, the average pore diameter is 5 μm, and the permeability coefficient is 490m measured according to the national standard GB/T5429-1985' determination of pore diameters of permeable sintered metal materials and bubble samples2.kPa.h。
Example 2
1. Preparing a PVB isopropanol solution according to the mass ratio of 1:20, aging for 24h, and stirring and mixing glycerol and the PVB isopropanol solution according to the mass ratio of 1:15 to obtain a mixed liquid.
2. Mixing 316L stainless steel powder with the average particle size of 20 mu m and the mixed liquid according to the mass ratio of 6:1, slowly adding the metal powder, and stirring to obtain a viscous slurry system;
3. pouring the viscous slurry system into two extruders, extruding a film blank from a slit die orifice with the size of 800mm multiplied by 500 mu m under the pushing of a screw rod, and slowly conveying a conveyor belt to two roll mills; placing a 316L stainless steel single-layer silk screen with the width of 900mm and the size of 40 meshes from the top of the middle part, compounding film blanks at two sides under the action of a rolling force of 100T, and accurately matching the rotating speed of a roller with a conveyor belt to prepare a powder mesh composite porous metal film blank;
4. cutting the powder mesh composite porous metal film blank into strips of 2000mm multiplied by 800mm, laying the film blank on a plate-type material rack, and arranging 60-mesh Al on a screen mesh2O3Powder isolating layer, spreading film blank, and circulating spreading in sequence;
5. and (3) loading the material frame of the laid film blank into a hydrogen atmosphere sintering furnace, heating to 530 ℃ at the speed of 5 ℃/min, preserving heat for 150min to remove organic matters, heating to 1080 ℃ at the speed of 10 ℃/min, preserving heat for 50min to form a sintering trap among metal powder, and preserving heat to obtain the powder mesh composite porous metal film.
The maximum pore diameter of the powder-mesh composite porous metal film of the embodiment is 12 μm, the average pore diameter is 6 μm, and the permeability coefficient is 540m measured according to the national standard GB/T5429-1985' determination of pore diameters of permeable sintered metal materials and bubble samples2kPa.h。
Example 3
1. Preparing a PVA aqueous solution according to the mass ratio of 1:20, aging for 24h, and stirring and mixing glycerol and the PVA aqueous solution according to the mass ratio of 1:8 to obtain a mixed liquid.
2. Mixing 316L stainless steel powder with the average particle size of 10 mu m and the mixed liquid according to the mass ratio of 5:1, slowly adding the metal powder, and stirring to obtain a viscous slurry system;
3. pouring the viscous slurry system into two extruders, extruding a film blank from a slit die orifice with the size of 100mm multiplied by 50 mu m under the pushing of a screw rod, and slowly conveying a conveyor belt to two roll mills; placing a 316L stainless steel single-layer wire mesh with the width of 120mm and the mesh of 300 at the top of the middle part, compounding film blanks at two sides under the action of a rolling force of 80T, and accurately matching the rotating speed of a roller with a conveyor belt to prepare a powder mesh composite porous metal film blank;
4. cutting the powder mesh composite porous metal film blank into strips of 2000mm multiplied by 100mm, laying the film blank on a plate-type material rack, and arranging 60-mesh Al on a screen mesh2O3Powder isolating layer, spreading film blank, and circulating spreading in sequence;
5. and (3) loading the material frame of the laid film blank into a hydrogen atmosphere sintering furnace, heating to 550 ℃ at the speed of 5 ℃/min, preserving heat for 120min to remove organic matters, heating to 980 ℃ at the speed of 10 ℃/min, preserving heat for 60min to form a sintering trap among the metal powder, and preserving heat to obtain the powder mesh composite porous metal film.
The maximum pore diameter of the powder-mesh composite porous metal film of the embodiment is 6 μm, the average pore diameter is 3 μm, and the permeability coefficient is 320m measured according to the national standard GB/T5429-1985' determination of pore diameters of permeable sintered metal materials and bubble samples2kPa.h。
Example 4
1. Preparing a CMC aqueous solution according to the mass ratio of 1:9, aging for 24h, and stirring and mixing glycerol and the CMC aqueous solution according to the mass ratio of 1:15 to obtain a mixed liquid.
2. Mixing 316L powder with the average particle size of 20 mu m and the mixed liquid according to the mass ratio of 3:1, slowly adding metal powder, and stirring to obtain a viscous slurry system;
3. pouring the viscous slurry system into two extruders, extruding a film blank from a slit die orifice with the size of 800mm multiplied by 500 mu m under the pushing of a screw rod, and slowly conveying a conveyor belt to a two-roller mill; placing a 316L stainless steel single-layer wire mesh with the width of 900mm and the mesh of 40 from the top of the middle part, compounding film blanks on two sides under the action of a rolling force of 100T, and accurately matching the rotating speed of a roller with a conveyor belt to prepare a powder mesh composite porous metal film blank;
4. cutting the powder mesh composite porous metal film blank into strips of 2000mm multiplied by 800mm, laying the film blank on a plate-type material rack, and arranging 60-mesh Al on a screen mesh2O3Powder isolating layer, spreading film blank, and circulating spreading in sequence;
5. and (3) loading the material frame of the film blank laid in the fourth step into a hydrogen atmosphere sintering furnace, heating to 500 ℃ at the speed of 5 ℃/min, preserving the temperature for 180min to remove organic matters, heating to 1080 ℃ at the speed of 10 ℃/min, preserving the temperature for 60min to form a sintering trap among metal powder, and preserving the temperature to obtain the powder mesh composite porous metal film.
The maximum pore diameter of the powder-mesh composite porous metal film of the embodiment is 12 μm, the average pore diameter is 6 μm, and the permeability coefficient is 540m measured according to the national standard GB/T5429-1985' determination of pore diameters of permeable sintered metal materials and bubble samples2.kPa.h。
Example 5
1. Preparing a PVB butanone solution according to the mass ratio of 1:16, aging for 24 hours, and stirring and mixing dioctyl phthalate and the PVB butanone solution according to the mass ratio of 1:10 to obtain a mixed liquid.
2. Mixing 316L stainless steel powder with the average particle size of 25 mu m and the mixed liquid according to the mass ratio of 8:1, slowly adding the metal powder, and stirring to obtain a viscous slurry system;
3. pouring the viscous slurry system into two extruders, extruding a film blank from a slit die orifice with the size of 500mm multiplied by 500 mu m under the pushing of a screw rod, and slowly conveying a conveyor belt to two roll mills; placing a 316L stainless steel single-layer wire mesh with the width of 600mm and the mesh of 20 from the top of the middle part, compounding film blanks at two sides under the action of a rolling force of 80T, and accurately matching the rotating speed of a roller with a conveyor belt to prepare a powder mesh composite porous metal film blank;
4. cutting the powder net composite porous metal film blank into strips of 2000mm multiplied by 500mm, laying the film blank on a plate-type material rack, and arranging 60-mesh Al on a screen mesh2O3Powder isolating layer, spreading film blank, and circulating spreading in sequence;
5. and (3) loading the material frame of the laid film blank into a hydrogen atmosphere sintering furnace, heating to 500 ℃ at the speed of 5 ℃/min, preserving heat for 180min to remove organic matters, heating to 1150 ℃ at the speed of 10 ℃/min, preserving heat for 40min to form a sintering trap among metal powder, and preserving heat to obtain the powder mesh composite porous metal film.
The maximum pore diameter of the powder-mesh composite porous metal film of the embodiment is 15 μm, the average pore diameter is 8 μm, and the permeability coefficient is 890m measured according to the national standard GB/T5429-1985' determination of pore diameters of permeable sintered metal materials and bubble samples2.kPa.h。
Example 6
1. Preparing a PVB butanol solution according to the mass ratio of 1:10, aging for 24 hours, and stirring and mixing dibutyl phthalate and the PVB butanol solution according to the mass ratio of 1:9 to obtain a mixed liquid.
2. Mixing 316L stainless steel powder with the average particle size of 10 mu m and the mixed liquid according to the mass ratio of 8:1, slowly adding the metal powder, and stirring to obtain a viscous slurry system;
3. pouring the viscous slurry system into two extruders, extruding a film blank from a slit die orifice with the size of 800mm multiplied by 200 mu m under the pushing of a screw rod, and slowly conveying a conveyor belt to two roll mills; placing a 316L stainless steel single-layer silk screen with the width of 900mm and the size of 40 meshes from the top of the middle part, compounding film blanks at two sides under the action of a rolling force of 100T, and accurately matching the rotating speed of a roller with a conveyor belt to prepare a powder mesh composite porous metal film blank;
4. cutting the powder mesh composite porous metal film blank into strips of 2000mm multiplied by 800mm, laying the film blank on a plate-type material rack, and arranging 60-mesh Al on a screen mesh2O3Powder isolating layer, spreading film blank, and circulating spreading in sequence;
5. and (3) loading the material frame of the laid film blank into a hydrogen atmosphere sintering furnace, heating to 550 ℃ at the speed of 5 ℃/min, preserving heat for 120min to remove organic matters, heating to 1150 ℃ at the speed of 10 ℃/min, preserving heat for 40min to form a sintering trap among metal powder, and preserving heat to obtain the powder mesh composite porous metal film.
The maximum pore diameter of the powder-mesh composite porous metal film of the embodiment is 10 μm, the average pore diameter is 5 μm, and the permeability coefficient is 430m measured according to the national standard GB/T5429-1985' determination of pore diameters of permeable sintered metal materials and bubble samples2.kPa.h。

Claims (10)

1. The preparation method of the powder mesh composite porous metal film is characterized by comprising the following steps of:
step 1, uniformly mixing a thickening agent and an organic solution or deionized water according to a mass ratio of 1: 9-20, and completely dissolving to obtain a mixed solution A;
step 2, uniformly mixing a plasticizer and the mixed solution A obtained in the step 1 according to a mass ratio of 1: 8-20 to obtain a mixed solution B;
step 3, mixing and stirring metal powder and the mixed liquid B obtained in the step 2 according to the mass ratio of 3-8: 1 to obtain a high-viscosity slurry system;
step 4, pouring the high-viscosity thick paste system obtained in the step 3 into an extruder, extruding a metal film blank with the width of 100-800 mm and the thickness of 50-500 mu m from a slit-shaped die opening, conveying the metal film blank to two roll mills, compounding a single-layer metal wire mesh with matched width between every two layers of metal film blanks, and rolling to obtain a powder mesh composite porous metal film blank;
step 5, flatly paving the powder mesh composite porous metal film blanks obtained in the step 4, putting the powder mesh composite porous metal film blanks into a hydrogen atmosphere sintering furnace to be sequentially stacked for sintering, and arranging Al between two adjacent layers of powder mesh composite porous metal film blanks through a screen mesh2O3Powder ofProtecting and isolating, then carrying out temperature programming, and sequentially carrying out organic matter removal and high-temperature sintering to prepare the powder mesh composite porous metal film.
2. The method for preparing a powder net composite porous metal film as claimed in claim 1, wherein the thickener in step 1 is one of polyvinyl butyral, polyvinyl alcohol or carboxymethyl cellulose, and the organic solution is one of ethanol, isopropanol, butanol or butanone.
3. The method for preparing a powder mesh composite porous metal film according to claim 1, wherein the plasticizer in step 2 is one of dibutyl phthalate, glycerol or dioctyl phthalate.
4. The method for preparing a powder mesh composite porous metal film as claimed in claim 1, wherein the metal powder in step 3 is 304 stainless steel, 316L stainless steel, 310s stainless steel, Fe3One of Al alloy powder, nickel-based high-temperature alloy, iron-based high-temperature alloy, copper powder, nickel powder or titanium powder, wherein the granularity of the metal powder is less than or equal to 25 mu m.
5. The method for preparing a powder mesh composite porous metal film as claimed in claim 1, wherein the size of the slit type die opening in the step 4 is 100mm x 50 μm, 300mm x 200 μm, 800mm x 500 μm, 800mm x 200 μm or 500mm x 500 μm.
6. The method for preparing a powder mesh composite porous metal film as claimed in claim 1, wherein the material of the single-layer wire mesh in step 4 is one of 304 stainless steel, 316L stainless steel, Cu, FeCrAl or 310S stainless steel.
7. The method for preparing a powder mesh composite porous metal film as claimed in claim 1, wherein the mesh number of the single-layer wire mesh in the step 4 is 20-300 meshes.
8. The method for preparing a powder mesh composite porous metal film according to claim 1, wherein the rolling force of the two-roll mill in the step 4 is controlled to be 30-100T.
9. The method for preparing a powder mesh composite porous metal film as claimed in claim 1, wherein Al in the step 52O3The mesh number of (2) is 60 meshes.
10. The preparation method of the powder mesh composite porous metal film according to claim 1, wherein the temperature for removing the organic matters in the step 5 is 500-550 ℃, and the temperature is kept for 120-180 min; the temperature of high-temperature sintering is 980-1150 ℃, and the temperature is kept for 40-60 min.
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