An integrated multi-element composite filter material and a preparation method thereof

Abstract

The application belongs to the technical field of composite filter material preparation, and mainly relates to an integrated multi-element composite filter material and a preparation method thereof. The integrated multi-element composite filter material comprises a metal wire mesh and MAX phase powder sintered and fixed on the metal wire mesh. The preparation method comprises the following steps: step one: laying the metal wire mesh and the powder on both sides of the metal wire mesh in a cold isostatic pressing mold, wherein at least one side of the powder on both sides is MAX phase powder, and forming a composite blank after cold isostatic pressing; and step two: vacuum sintering the composite blank to obtain the integrated composite filter material. By arranging the MAX phase powder, the MAX phase powder has the characteristics of corrosion resistance and wear resistance, and the problems of poor corrosion resistance and surface wear resistance of the filter material are solved.

Description

Technical Field

[0001] This invention belongs to the field of composite filter material preparation technology, and mainly relates to an integrated multi-component composite filter material and its preparation method. Background Technology

[0002] Porous metal filter materials used in the filtration and separation industry are mostly designed for harsh conditions involving high temperature, high pressure, and highly corrosive dust-laden gases. Therefore, these materials must possess high filtration accuracy and throughput, as well as certain strength, toughness, and corrosion resistance. Typically, powder is combined with metal wire mesh to achieve these requirements. Currently, powder-mesh composite preparation processes include spraying and brushing, but these methods present challenges in coating large-pore wire meshes.

[0003] Chinese patent document CN101721921B discloses a method for preparing a metal film by coating a layer of filler onto a support mesh with large pores to block the pores, then coating a layer of metal powder slurry, removing the filler through heat treatment, and finally sintering. However, this powder-mesh composite method produces a powder-mesh with poor bonding strength and low wear resistance; furthermore, the process is complex because it requires heat treatment to burn off the organic filler, and harmful gases are generated during the heat treatment process. Summary of the Invention

[0004] This invention provides an integrated multi-component composite filter material to solve the problem of wear resistance in existing composite powder meshes.

[0005] The present invention also provides a method for preparing an integrated multi-component composite filter material to solve the problem of wear resistance of composite powder mesh in the prior art.

[0006] To solve the above problems, the present invention adopts the following technical solution:

[0007] An integrated multi-component composite filter material includes a metal wire mesh and MAX phase powder sintered and fixed on the metal wire mesh.

[0008] It has the following beneficial effects: By setting MAX phase powder, which has corrosion resistance and wear resistance, the problem of poor corrosion resistance and surface wear resistance of filter materials is solved.

[0009] Furthermore, the outer surface of the MAX phase powder is provided with a Ti coating.

[0010] It has the following beneficial effects: by plating Ti on the outer surface of MAX phase powder, the bonding ability of MAX phase powder with metal mesh and metal powder can be improved; at the same time, Ti has the characteristics of corrosion resistance and wear resistance, and by plating Ti on MAX phase powder, the performance of MAX phase powder is further improved.

[0011] Furthermore, the metal mesh includes a first metal mesh and a second metal mesh. The MAX phase powder is sintered and fixed on one side of the first metal mesh, and metal powder is sintered and fixed on the other side of the first metal mesh, between one side of the second metal mesh, and on the other side of the second metal mesh.

[0012] A method for preparing the integrated multi-component composite filter material includes the following steps:

[0013] Step 1: Lay a metal wire mesh and powder on both sides of the metal wire mesh in a cold isostatic pressing mold, wherein at least one side of the powder is MAX phase powder, and a composite blank is formed after cold isostatic pressing.

[0014] Step 2: Vacuum sinter the composite preform to obtain an integrated composite filter material.

[0015] It has the following beneficial effects: By setting MAX phase powder, which has corrosion resistance and wear resistance, the problem of poor corrosion resistance and surface wear resistance of filter materials is solved.

[0016] Furthermore, in step one, the MAX phase powder is a MAX phase powder with a Ti coating on its surface.

[0017] Furthermore, before the MAX phase powder is plated with Ti, the MAX phase powder is cleaned to obtain pure MAX phase powder;

[0018] The MAX phase powder was ultrasonically cleaned with anhydrous ethanol for 30-60 minutes at a temperature of 60-70°C, and then dried in an oven at a temperature of 90-120°C for 2-3 hours. The volume purity of the anhydrous ethanol was 99.9%.

[0019] The MAX phase powder was then plated with Ti using a multi-arc ion plating process at a temperature of 200–300°C for 2–3 hours, with nitrogen as the gas.

[0020] It has the following beneficial effects: by cleaning the MAX phase powder, it prevents it from affecting the subsequent Ti plating; by plating Ti on the surface of the MAX phase powder, Ti has the characteristics of corrosion resistance and wear resistance, which solves the problem of poor corrosion resistance and surface wear resistance of filter materials.

[0021] Further, in step one, the metal mesh includes a first metal mesh and a second metal mesh. The MAX phase powder containing the Ti coating is sintered and fixed on one side of the first metal mesh, and the metal powder is sintered and fixed on the other side of the first metal mesh, between one side of the second metal mesh, and on the other side of the second metal mesh.

[0022] The first metal wire mesh is a square-hole mesh or steel plate mesh with a mesh count of 30 to 120. The second metal wire mesh is a dense mesh with a mesh count of 200 to 400. The materials of the first and second metal wire mesh are both 316L, 317L or 310S.

[0023] Before laying the first and second metal wire mesh in the cold isostatic pressing mold, the first and second metal wire meshes need to be leveled and ultrasonically cleaned with anhydrous ethanol for 1 to 2 hours. After that, they are dried in an oven at a temperature of 60 to 80°C for 30 to 90 minutes.

[0024] It has the following beneficial effects: The metal wire mesh in this application is mainly used as a skeleton support and does not have a filtering function.

[0025] Furthermore, the MAX phase powder is one of Ti3AlC2, Ti3SiC2, Ti2AlC or Cr3AlC2, and the particle size of the MAX phase powder is 38μm to 150μm;

[0026] The metal powder is made of 316L, 317L, or 310S stainless steel powder or FeAl3 or TiAl alloy powder. The particle size of the powder is 18–96 μm, and large particles are removed by sieving through a 150-mesh sieve.

[0027] It has the following beneficial effects: MAX phase is a high-hardness ternary layered conductive ceramic with good thermal shock resistance and fracture toughness, which can enhance the strength of filter materials.

[0028] Furthermore, the pressurization rate of cold isostatic pressing is 3-6 MPa / min, the pressure is 120-200 MPa, and the holding time is 10-120 s.

[0029] Furthermore, the vacuum sintering is a segmented sintering process. The sintering steps are: raising the temperature from room temperature to 400–500℃ and holding for 30–60 minutes, with a heating rate of 4–5℃ / min; raising the temperature to 800–1000℃ and holding for 30–60 minutes, with a heating rate of 5–6℃ / min; and raising the temperature to 1100–1250℃ and holding for 1–2 hours, with a heating rate of 5–6℃ / min. The vacuum degree is 2.0 × 10⁻⁶. - 3 Pa ~ 3.0 × 10 -3 Pa;

[0030] During vacuum sintering, composite green bodies are stacked and placed together, with fine oxide sand spread between adjacent composite green bodies for isolation. Attached Figure Description

[0031] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0032] Figure 1 This is a schematic diagram of the integrated multi-component composite filter material in Example 1;

[0033] Figure 2 This is a schematic diagram of the cold isostatic pressing mold in Example 2.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. MAX phase powder; 2. First metal wire mesh; 3. Metal powder; 4. Second metal wire mesh; 5. Lower mold; 6. Upper mold; 7. Through hole; 8. First film; 9. Second film; 10. Cavity seat; 11. Annular sealing gasket. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] Various non-limiting embodiments of the present invention are described in detail below. Any number of elements in the accompanying drawings is for illustrative purposes only and not for limitation, and any naming is for distinction only and has no limiting meaning. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0038] Example 1

[0039] like Figure 1As shown, an integrated multi-component composite filter material includes a first metal mesh 2 and a second metal mesh 4. A MAX phase powder 1 is sintered and fixed on one side of the first metal mesh 2. Metal powder 3 is sintered and fixed on the other side of the first metal mesh 2, between one side of the second metal mesh 4, and on the other side of the second metal mesh 4. In this embodiment, the outer surface of the MAX phase powder 1 is coated with a Ti layer. By setting the MAX phase powder 1, the MAX phase powder 1 has corrosion resistance and wear resistance, solving the problem of poor corrosion resistance and surface wear resistance of the filter material. By coating the outer surface of the Ti3AlC2 powder with Ti, the bonding ability of the Ti3AlC2 powder with 316L stainless steel powder and the fine mesh can be improved. At the same time, Ti has corrosion resistance and wear resistance. By coating Ti onto the MAX phase powder 1, the performance of the MAX phase powder 1 is further improved.

[0040] In this embodiment, the MAX phase powder 1 is one of Ti3AlC2, Ti3SiC2, Ti2AlC or Cr3AlC2; the metal powder 3 is made of one of 316L, 317L, 310S stainless steel powder or FeAl3, TiAl alloy powder; the first metal wire mesh 2 is one of square hole mesh or steel plate mesh; the second metal wire mesh 4 is a dense mesh; the square hole mesh, steel plate mesh and dense mesh are all made of one of 316L, 317L or 310S.

[0041] Example 2

[0042] Figure 2 This is a schematic diagram of the cold isostatic pressing mold in this embodiment. The cold isostatic pressing mold includes an upper mold 6 and a lower mold 5. The lower mold 5 has a first groove, and the upper mold 6 has a second groove. The first groove and the second groove are arranged opposite to each other, forming the mold space of the cold isostatic pressing mold. Each groove has multiple through holes 7 at its bottom. A first film 8 is laid on the bottom of the first groove to cover the multiple through holes 7, and a second film 9 is laid on the bottom of the second groove to cover the multiple through holes 7. A cavity seat 10 is fixedly installed at the bottom of the groove. The cavity seat 10 has an installation space that runs through the middle of the cavity seat 10. The installation space is used to lay the metal powder 3 to be pressed, the first metal wire mesh 2, the second metal wire mesh 4, and the MAX phase powder 1. An annular sealing gasket 11 is set around the perimeter of the mold space and is tightly attached to the wall of the first groove. The upper mold 6 and the lower mold 5 are fixed by bolts, and the first groove and the second groove are opposite to each other, so that the bottom of the second groove presses against the cavity seat 10 and the annular sealing gasket 11 to achieve a seal.

[0043] When laying metal powder 3, first metal wire mesh 2, second metal wire mesh 4 and MAX phase powder 1 in the installation space, metal powder 3, second metal wire mesh 4, metal powder 3, first metal wire mesh 2 and MAX phase powder 1 should be laid sequentially on the first film 8 in the installation space.

[0044] Example 3

[0045] A method for preparing an integrated multi-component composite filter material requires two powders: Ti3AlC2 powder and 316L stainless steel powder. The preparation method includes the following steps:

[0046] First, Ti3AlC2 powder with a particle size of 38μm was ultrasonically cleaned with anhydrous ethanol for 30 minutes at a temperature of 60℃, followed by oven drying at 90℃ for 2 hours. The anhydrous ethanol used had a volume purity of 99.9%. After drying, Ti3AlC2 powder was plated with Ti using a multi-arc ion plating process at 200℃ for 2 hours under nitrogen gas. Simultaneously, 316L stainless steel powder with a particle size of 18μm was sieved through a 150-mesh sieve to remove large particles. Plating Ti on the outer surface of Ti3AlC2 powder improves the bonding ability between Ti3AlC2 powder and 316L stainless steel powder and the fine-textured mesh. Furthermore, Ti's corrosion and wear resistance properties are further enhanced by plating Ti onto Ti3AlC2 powder, thus improving its corrosion and wear resistance.

[0047] Then, the 30-mesh steel mesh and the 200-mesh fine-weave wire mesh were respectively subjected to a leveling process. After leveling, the steel mesh and the fine-weave wire mesh were ultrasonically cleaned with anhydrous ethanol for 1 hour, and then dried in an oven at 60℃ for 30 minutes. Both types of wire mesh were made of 316L stainless steel.

[0048] Then, 316L stainless steel powder, expanded metal mesh, 316L stainless steel powder, fine-textured mesh, and Ti-plated Ti3AlC2 powder are sequentially assembled in a cold isostatic pressing mold. Cold isostatic pressing is then performed at a pressurization rate of 3 MPa / min, a pressure of 120 MPa, and a holding time of 10 seconds. After forming, the material is removed from the cold isostatic pressing mold to obtain a pressed composite preform. In this embodiment, the expanded metal mesh and fine-textured mesh are mainly used as a skeletal support and do not have a filtering function.

[0049] Finally, the composite preform is placed in a vacuum furnace for segmented sintering. Through vacuum sintering, an integral composite filter material is obtained. The vacuum sintering is segmented, and the sintering process is as follows: temperature rises from room temperature to 400℃ and holds for 30 minutes (heating rate 4℃ / min); temperature rises to 800℃ and holds for 30 minutes (heating rate 5℃ / min); temperature rises to 1100℃ and holds for 1 hour (heating rate 5℃ / min); the vacuum degree is 2.0 × 10⁻⁶. -3 Pa. During the vacuum sintering process, composite blanks are stacked, and fine oxide sand is spread between adjacent composite blanks for isolation. After sintering, the final plate-shaped integrated multi-component composite filter material is obtained.

[0050] Example 4

[0051] A method for preparing an integrated multi-component composite filter material requires two powders: Ti3SiC2 powder and 317L stainless steel powder. The preparation method includes the following steps:

[0052] First, Ti3SiC2 powder with a particle size of 62 μm was ultrasonically cleaned with anhydrous ethanol for 40 min at a temperature of 65 °C, and then dried in an oven at 100 °C for 2.5 h. The anhydrous ethanol used had a volume purity of 99.9%. After drying, the Ti3SiC2 powder was plated with Ti using a multi-arc ion plating process at a temperature of 250 °C for 2.5 h using nitrogen gas. Large particles of 317L stainless steel powder with a particle size of 38 μm were removed by sieving through a 150-mesh sieve.

[0053] Then, the 40-mesh square-hole mesh and the 300-mesh dense-weave mesh were respectively subjected to a flattening treatment. After the flattening treatment, the square-hole mesh and the dense-weave mesh were ultrasonically cleaned with anhydrous ethanol for 1.5 hours, and then dried in an oven at 70℃ for 50 minutes. Both types of wire mesh were made of 317L.

[0054] Then, 317L stainless steel powder, square hole mesh, 317L stainless steel powder, dense mesh, and Ti-plated Ti3SiC2 powder are sequentially assembled in a cold isostatic pressing mold. After that, cold isostatic pressing is performed. The pressurization rate of cold isostatic pressing is 4MPa / min, the pressure is 130MPa, and the holding time is 20s. After forming, it is taken out from the cold isostatic pressing mold to obtain the pressed composite blank.

[0055] Finally, the composite preform is placed in a vacuum furnace for segmented sintering. Through vacuum sintering, an integral composite filter material is obtained. The vacuum sintering is segmented, and the sintering process is as follows: temperature rises from room temperature to 450℃ and holds for 40 minutes (heating rate 4.5℃ / min); temperature rises to 900℃ and holds for 40 minutes (heating rate 5.5℃ / min); temperature rises to 1150℃ and holds for 1.5 hours (heating rate 5.5℃ / min); the vacuum degree is 2.5 × 10⁻⁶. -3 Pa. During the vacuum sintering process, composite blanks are stacked, and fine oxide sand is spread between adjacent composite blanks for isolation. After sintering, the final plate-shaped integrated multi-component composite filter material is obtained.

[0056] Example 5

[0057] A method for preparing an integrated multi-component composite filter material requires two powders: Ti2AlC powder and 310S stainless steel powder. The preparation method includes the following steps:

[0058] First, Ti2AlC powder with a particle size of 96μm was ultrasonically cleaned with anhydrous ethanol for 50 minutes at a temperature of 70℃, and then dried in an oven at 110℃ for 3 hours. The volume purity of the anhydrous ethanol used was 99.9%. After drying, Ti2AlC powder was plated with Ti using a multi-arc ion plating process at a temperature of 300℃ for 3 hours, with nitrogen gas as the gas. Large particles of 310S stainless steel powder with a particle size of 53μm were removed by sieving through a 150-mesh sieve.

[0059] Then, the 60-mesh square-hole mesh and the 400-mesh dense-weave mesh were respectively subjected to a leveling treatment. After the leveling treatment, the square-hole mesh and the dense-weave mesh were ultrasonically cleaned with anhydrous ethanol for 2 hours, and then dried in an oven at 80℃ for 60 minutes. Both types of wire mesh were made of 310S material.

[0060] Then, 310S stainless steel powder, square hole mesh, 310S stainless steel powder, dense mesh, and Ti-plated Ti2AlC powder are sequentially assembled in a cold isostatic pressing mold. After that, cold isostatic pressing is performed. The pressurization rate of cold isostatic pressing is 5MPa / min, the pressure is 150MPa, and the holding time is 50s. After forming, it is taken out from the cold isostatic pressing mold to obtain the pressed composite blank.

[0061] Finally, the composite preform is placed in a vacuum furnace for segmented sintering. Through vacuum sintering, an integral composite filter material is obtained. The vacuum sintering is segmented sintering, and the sintering process is as follows: the temperature is raised from room temperature to 500℃ and held for 50 minutes, with a heating rate of 5℃ / min for this segment; the temperature is raised to 1000℃ and held for 50 minutes, with a heating rate of 6℃ / min for this segment; the temperature is raised to 1200℃ and held for 2 hours, with a heating rate of 6℃ / min for this segment; the vacuum degree is 3.0×10⁻⁶. -3 Pa. During the vacuum sintering process, composite blanks are stacked, and fine oxide sand is spread between adjacent composite blanks for isolation. After sintering, the final plate-shaped integrated multi-component composite filter material is obtained.

[0062] Example 6

[0063] A method for preparing an integrated multi-component composite filter material requires two powders: Cr3AlC2 powder and FeAl3 alloy powder. The preparation method includes the following steps:

[0064] First, Cr3AlC2 powder with a particle size of 120μm was ultrasonically cleaned with anhydrous ethanol for 60 minutes at a temperature of 60℃, and then dried in an oven at 120℃ for 2 hours. The volume purity of the anhydrous ethanol used was 99.9%. After drying, the Cr3AlC2 powder was plated with Ti using a multi-arc ion plating process at a temperature of 200℃ for 3 hours, with nitrogen as the gas. Meanwhile, FeAl3 alloy powder with a particle size of 75μm was sieved through a 150-mesh sieve to remove large particles.

[0065] Then, the 90-mesh steel mesh and the 300-mesh fine-weave wire mesh were respectively subjected to a leveling treatment. After leveling, the steel mesh and the fine-weave wire mesh were ultrasonically cleaned with anhydrous ethanol for 1.5 hours, followed by oven drying at 60℃ for 90 minutes. Both types of wire mesh were made of 317L steel.

[0066] Then, FeAl3 alloy powder, steel mesh, FeAl3 alloy powder, fine mesh, and Ti-plated Cr3AlC2 powder are sequentially assembled in a cold isostatic pressing mold. After that, cold isostatic pressing is performed. The pressurization rate of cold isostatic pressing is 6 MPa / min, the pressure is 180 MPa, and the holding time is 80 s. After forming, it is taken out from the cold isostatic pressing mold to obtain the pressed composite blank.

[0067] Finally, the composite preform was placed in a vacuum furnace for segmented sintering. Through vacuum sintering, an integral composite filter material was obtained. The vacuum sintering was segmented, with the following steps: temperature was raised from room temperature to 450℃ and held for 60 minutes at a rate of 4℃ / min; the temperature was raised to 800℃ and held for 60 minutes at a rate of 5.5℃ / min; the temperature was raised to 1250℃ and held for 1 hour at a rate of 5℃ / min. The vacuum degree was 2.0 × 10⁻⁶. -3 Pa. During the vacuum sintering process, composite blanks are stacked, and fine oxide sand is spread between adjacent composite blanks for isolation. After sintering, the final plate-shaped integrated multi-component composite filter material is obtained.

[0068] Example 7

[0069] A method for preparing an integrated multi-component composite filter material requires two types of powder: Ti3SiC2 powder and TiAl alloy powder. The preparation method includes the following steps:

[0070] First, Ti3SiC2 powder with a particle size of 150 μm was ultrasonically cleaned with anhydrous ethanol for 40 min at a temperature of 60 °C, and then dried in an oven at 100 °C for 2.5 h. The anhydrous ethanol used had a volume purity of 99.9%. After drying, the Ti3SiC2 powder was plated with Ti using a multi-arc ion plating process at a temperature of 250 °C for 2 h using nitrogen gas. Large particles of TiAl alloy powder with a particle size of 96 μm were removed by sieving through a 150-mesh sieve.

[0071] Then, the 120-mesh square-hole mesh and the 200-mesh dense-weave mesh were respectively subjected to a flattening treatment. After the flattening treatment, the square-hole mesh and the dense-weave mesh were ultrasonically cleaned with anhydrous ethanol for 1 hour, and then dried in an oven at 70℃ for 50 minutes. Both types of wire mesh were made of 310S material.

[0072] Then, TiAl alloy powder, square hole mesh, TiAl alloy powder, dense mesh, and Ti-plated Ti3SiC2 powder are sequentially assembled in a cold isostatic pressing mold. After that, cold isostatic pressing is performed. The pressurization rate of cold isostatic pressing is 5 MPa / min, the pressure is 200 MPa, and the holding time is 120 s. After forming, it is taken out from the cold isostatic pressing mold to obtain the pressed composite blank.

[0073] Finally, the composite preform is placed in a vacuum furnace for segmented sintering. Through vacuum sintering, an integral composite filter material is obtained. The vacuum sintering is segmented, and the sintering process is as follows: room temperature is raised to 450℃ and held for 50 minutes at a heating rate of 4℃ / min; then raised to 900℃ and held for 50 minutes at a heating rate of 5℃ / min; finally, the temperature is raised to 1200℃ and held for 2 hours at a heating rate of 5℃ / min. The vacuum degree is 2.5 × 10⁻⁶. -3 Pa. During the vacuum sintering process, composite blanks are stacked, and fine oxide sand is spread between adjacent composite blanks for isolation. After sintering, the final plate-shaped integrated multi-component composite filter material is obtained.

[0074] Example 8

[0075] A method for preparing an integrated multi-component composite filter material requires two powders: Ti3AlC2 powder and 316L stainless steel powder. The preparation method includes the following steps:

[0076] First, Ti3AlC2 powder with a particle size of 96μm was ultrasonically cleaned with anhydrous ethanol for 50 minutes at a temperature of 65℃, and then dried in an oven at 110℃ for 3 hours. The volume purity of the anhydrous ethanol used was 99.9%. After drying, Ti3AlC2 powder was plated with Ti using a multi-arc ion plating process at a temperature of 250℃ for 2 hours using nitrogen gas. Large particles of 316L stainless steel powder with a particle size of 62μm were removed by sieving through a 150-mesh sieve.

[0077] Then, the 80-mesh square-hole mesh and the 300-mesh dense-weave mesh were respectively subjected to a flattening treatment. After the flattening treatment, the square-hole mesh and the dense-weave mesh were ultrasonically cleaned with anhydrous ethanol for 1 hour, and then dried in an oven at 70℃ for 70 minutes. Both types of wire mesh were made of 316L stainless steel.

[0078] Then, 316L stainless steel powder, square hole mesh, 316L stainless steel powder, dense mesh, and Ti-plated Ti3AlC2 powder are sequentially assembled in a cold isostatic pressing mold. After that, cold isostatic pressing is performed. The pressurization rate of cold isostatic pressing is 5MPa / min, the pressure is 150MPa, and the holding time is 60s. After forming, it is taken out from the cold isostatic pressing mold to obtain the pressed composite blank.

[0079] Finally, the composite preform is placed in a vacuum furnace for segmented sintering. Through vacuum sintering, an integral composite filter material is obtained. The vacuum sintering is segmented, and the sintering process is as follows: temperature rises from room temperature to 400℃ and holds for 40 minutes (heating rate 5℃ / min); temperature rises to 900℃ and holds for 40 minutes (heating rate 6℃ / min); temperature rises to 1200℃ and holds for 1.5 hours (heating rate 6℃ / min); the vacuum degree is 3.0 × 10⁻⁶. -3 Pa. During the vacuum sintering process, composite blanks are stacked, and fine oxide sand is spread between adjacent composite blanks for isolation. After sintering, the final plate-shaped integrated multi-component composite filter material is obtained.

Claims

1. A method for preparing an integrated multi-component composite filter material, characterized in that, Includes a metal wire mesh and MAX phase powder (1) sintered and fixed on the metal wire mesh; The process includes the following steps: Step 1: A metal wire mesh and powder on both sides of the metal wire mesh are laid in a cold isostatic pressing mold, wherein at least one side of the powder is MAX phase powder (1), and a composite blank is formed after cold isostatic pressing; the MAX phase powder (1) is MAX phase powder (1) with Ti coating on the surface. Step 2: Vacuum sinter the composite preform to obtain an integrated composite filter material; In step one, the metal mesh includes a first metal mesh (2) and a second metal mesh (4). The MAX phase powder (1) containing a Ti coating is sintered and fixed on one side of the first metal mesh (2). Metal powder (3) is sintered and fixed on the other side of the first metal mesh (2), between one side of the second metal mesh (4), and on the other side of the second metal mesh (4).

2. The method for preparing an integrated multi-component composite filter material according to claim 1, characterized in that, Before plating Ti onto the MAX phase powder (1), the MAX phase powder (1) is cleaned to obtain pure MAX phase powder (1); The MAX phase powder (1) was ultrasonically cleaned with anhydrous ethanol for 30-60 min at a temperature of 60-70°C, and then dried in an oven at a temperature of 90-120°C for 2-3 h. The volume purity of the anhydrous ethanol was 99.9%. The MAX phase powder (1) was then plated with Ti using a multi-arc ion plating process at a temperature of 200-300°C for 2-3 hours, with nitrogen as the gas.

3. The method for preparing an integrated multi-component composite filter material according to claim 2, characterized in that, The first metal wire mesh (2) is a square hole mesh or steel plate mesh with a mesh count of 30 to 120 meshes, and the second metal wire mesh (4) is a dense mesh with a mesh count of 200 to 400 meshes. The materials of the first metal wire mesh (2) and the second metal wire mesh (4) are all 316L, 317L or 310S. Before laying the first metal wire mesh (2) and the second metal wire mesh (4) in the cold isostatic pressing mold, it is necessary to flatten them and use anhydrous ethanol to ultrasonically clean the first metal wire mesh (2) and the second metal wire mesh (4) for 1 to 2 hours. After that, they are dried in an oven at a temperature of 60 to 80°C for 30 to 90 minutes.

4. The method for preparing an integrated multi-component composite filter material according to claim 3, characterized in that, The MAX phase powder (1) is one of Ti3AlC2, Ti3SiC2, Ti2AlC or Cr3AlC2, and the particle size of the MAX phase powder (1) is 38μm to 150μm. The metal powder (3) is made of 316L, 317L, 310S stainless steel powder or FeAl3, TiAl alloy powder, and the particle size of the powder is 18-96μm. Large particles are removed by sieving through a 150-mesh sieve.

5. A method for preparing an integrated multi-component composite filter material according to any one of claims 1-4, characterized in that, The pressurization rate of cold isostatic pressing is 3-6 MPa / min, the pressure is 120-200 MPa, and the holding time is 10-120 s.

6. A method for preparing an integrated multi-component composite filter material according to any one of claims 1-4, characterized in that, Vacuum sintering is a segmented sintering process. The sintering steps are: raising the temperature from room temperature to 400–500℃ and holding for 30–60 minutes (heating rate 4–5℃ / min); raising the temperature to 800–1000℃ and holding for 30–60 minutes (heating rate 5–6℃ / min); raising the temperature to 1100–1250℃ and holding for 1–2 hours (heating rate 5–6℃ / min); the vacuum degree is 2.0 × 10⁻⁶. -3 Pa ~ 3.0 × 10 - 3 Pa; During vacuum sintering, composite green bodies are stacked and placed together, with fine oxide sand spread between adjacent composite green bodies for isolation.

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