Powder porous and silk screen laminated composite wick and preparation method thereof

Abstract

The invention discloses a powder porous and silk screen laminated composite wick, which is formed by laminating a powder porous matrix and a metal silk screen made of the same material, sintering and compounding, and the surface of the powder porous matrix is provided with a nano bulge structure; the metal wire mesh is a single-layer wire mesh composite wire mesh; the preparation method comprises the following steps: 1, treating the surface of the powder porous matrix; 2, processing nano-particle slurry and spraying the nano-particle slurry to the surface of the powder porous matrix; 3, designing and processing a laminated composite structure; 4, sintering the laminated composite structure; and 5, post-processing treatment. The composite liquid absorption core is formed by stacking, sintering and compositing the powder porous matrix and the metal wire mesh, the composite liquid absorption core has a powder porous and wire mesh composite structure, regulation and control of a cooling working medium in the using process are achieved through the pore characteristics of the powder porous matrix, meanwhile, the mechanical property of the composite liquid absorption core is improved through the high strength of the metal wire mesh, and the service life of the composite liquid absorption core is prolonged. Therefore, the performance of two porous materials with different structures is synergistically enhanced, the heat dissipation efficiency of the heat pipe is improved, and the heat pipe is suitable for the field of heat management.

Description

Technical Field

[0001] This invention belongs to the field of micro-nano fabrication technology of multilayer composite structures and porous metal materials, specifically relating to a powder porous and wire mesh stacked composite liquid absorbent core and its preparation method. Background Technology

[0002] New energy vehicle chips, generator set heat dissipation, and various high-power LED appliances are all developing towards miniaturization, lightweighting, high frequency, and high speed, i.e., high power and hyper-integration. The special operating environment of these electronic or power supply devices, and the increasingly stringent requirements on their size, weight, and lifespan, make heat dissipation increasingly severe, highlighting the importance of thermal management for power electronic devices. Phase change boiling cooling shows promising practical application prospects for heat dissipation in electronic devices with high surface heat flux densities. Heat pipes, as highly efficient heat transfer elements, possess advantages such as high thermal conductivity, good temperature uniformity, and high reliability, and have been widely used in intelligent devices, aerospace, and other fields.

[0003] As the core component of a heat pipe, the performance of the wick directly determines the capillary limit of the heat pipe, playing a decisive role in the overall performance. The selection of the wick structure typically considers the following three criteria: equivalent thermal conductivity, which indicates the radial thermal resistance of the ultra-thin heat pipe; permeability, which determines the pressure drop of the working fluid within the wick; and effective capillary radius, which determines whether the wick can provide a greater backflow driving force. Furthermore, the mechanical properties of the wick are also important indicators in heat pipe design and fabrication, depending on the specific application environment.

[0004] Generally, increasing the capillary radius to reduce flow resistance will decrease the permeability and capillary force of the wick. Similarly, increasing the cross-sectional area of ​​the wick can reduce flow resistance but also increase radial thermal resistance; therefore, the synergistic effect between these parameters should be considered. According to heat pipe principles, when the wick pore size decreases, the capillary force of a porous wick heat pipe increases while the permeability decreases; conversely, when the wick pore size increases, the capillary force decreases while the permeability increases. In other words, in ordinary single-pore porous wick heat pipes, there is an inverse relationship between capillary force and permeability, which limits the heat transfer capacity of ordinary single-pore porous wick heat pipes. Considering the characteristics of each part of the heat pipe, a composite wick consisting of powder porous and wire mesh layers needs to be constructed to balance the contradiction between the heat transfer requirements and mechanical properties of the porous wick, thereby improving the heat pipe's performance. Summary of the Invention

[0005] The technical problem to be solved by this invention is to address the shortcomings of the prior art by providing a composite liquid wick composed of a porous powder matrix and a metal wire mesh. This composite liquid wick is formed by sintering a porous powder matrix and a metal wire mesh, combining the properties of both porous powder and wire mesh structures. It effectively integrates the high capillary force of the porous powder matrix with the high mechanical properties of the wire mesh structure, achieving synergistic enhancement of the properties of these two different porous materials. This solves the contradiction between heat exchange requirements and mechanical properties in existing porous liquid wicks.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a composite liquid-absorbing core made of powder porous matrix and wire mesh, characterized in that the composite liquid-absorbing core is formed by sintering together a powder porous matrix and a metal wire mesh of the same material, wherein the thickness of the powder porous matrix is ​​0.15mm~2mm, the porosity is 10%~55%, the maximum pore size is 1.5μm~50μm, and the surface of the powder porous matrix has a nano-protrusion structure formed by spraying nanoparticle slurry onto the powder porous matrix, with a thickness of 50nm~300nm; the metal wire mesh is a single-layer wire mesh or a composite wire mesh formed by rolling 2~5 layers of wire mesh, and the pore size of the single-layer wire mesh is 20μm~100μm, and the pore size of the composite wire mesh is 2μm~30μm; the thickness of the composite liquid-absorbing core is 0.4mm~10mm, and the porosity is 15%~65%.

[0007] The above-mentioned powder porous and wire mesh laminated composite liquid absorbent core is characterized in that the raw material metal powder for preparing the powder porous matrix is ​​nickel powder, Inconel 625 nickel alloy powder, Inconel 718 nickel alloy powder, 316L stainless steel powder or titanium powder.

[0008] The aforementioned composite liquid absorbent core consisting of porous powder and wire mesh is characterized in that the porous powder matrix is ​​obtained by sintering after powder rolling, or by directly obtaining it by loose-fitting sintering using a mold, and is dimensionally processed before use.

[0009] The aforementioned composite wicking core made of porous powder and wire mesh is characterized in that, when the raw material for preparing the porous powder matrix is ​​nickel powder, Inconel 625 nickel alloy powder, or Inconel 718 nickel alloy powder, the composite wicking core is sintered in a hydrogen atmosphere with a hydrogen flow rate of 0.25 m³ / h; when the raw material for preparing the porous powder matrix is ​​316L stainless steel powder or titanium powder, the composite wicking core is sintered under vacuum conditions with a vacuum degree not exceeding 9.0 × 10⁻⁶ m³ / h. -2 Pa.

[0010] The aforementioned composite wicking core consisting of porous powder and wire mesh is characterized in that the nanoparticle slurry is composed of titanium carbide, titanium tungstenide, titanium oxide, nickel, or copper, and has a particle size of 20 nm to 70 nm. The nanoparticle slurry of this invention exhibits good sintering properties, which can reduce the sintering temperature of the composite wicking core. Furthermore, the nano-protrusion structure subsequently formed on the porous powder matrix enhances the capillary action of the composite wicking core, improves the working fluid reflux efficiency, and optimizes heat transfer performance, thereby enhancing its heat dissipation effect when applied in heat pipes.

[0011] Meanwhile, this invention also discloses a method for preparing the above-mentioned powder porous and wire mesh laminated composite liquid absorbent core, characterized in that the method includes the following steps: Step 1: Surface treatment of porous powder substrate The porous powder matrix is ​​surface-treated with a treatment solution, then removed and cleaned with deionized water, then cleaned with anhydrous ethanol and dried to obtain the treated porous powder matrix. The composition of the treatment solution by volume percentage is: 1%~3% HF acid with a mass concentration of 40%, 2%~6% HNO3 with a mass concentration of 68%, 5%~10% ethylene glycol, and the balance is water. Step 2: Pre-processing of the surface structure of the powder porous matrix Nanoparticles are dispersed in an ethanol solution of polyvinyl butyral with a mass fraction of 3% to 7% to obtain a slurry with a solid content of 8% to 15%. The slurry is then sprayed onto the surface of the powder porous matrix treated in step one to obtain a pre-processed powder porous matrix. Step 3: Design and fabrication of the powder porous matrix and wire mesh laminated composite structure The CAXA software was used to design the powder porous matrix and the wire mesh laminated composite structure. Then, the powder porous matrix and the wire mesh laminated composite structure were processed according to the model obtained from the design to obtain the laminated composite structure. Step 4: Sintering of the laminated composite structure The multilayer composite structure obtained in step three is sintered to obtain a sintered multilayer composite structure; the sintering temperature is 950℃~1250℃, and the holding time is 1.5h~3.5h. Step 5: Post-processing The sintered composite structure obtained in step four is precisely machined to the target size according to the design drawings, cleaned with deionized water and anhydrous ethanol in sequence, and then treated at 80℃~500℃ to obtain a powder porous and wire mesh multilayer composite liquid absorption core.

[0012] The above-mentioned preparation method is characterized in that the processing of the powder porous matrix and wire mesh laminated composite structure in step three is as follows: one, two or three layers of the same pre-processed powder porous matrix from step two are selected and laminated to form the first layer. Then, a metal wire mesh of the same material as the pre-processed powder porous matrix in step two is laid on the first layer to form the second layer. Then, the same number of pre-processed powder porous matrix layers as the first layer are laid on the second layer to form the third layer. And so on, the laying process of pre-processed powder porous matrix and metal wire mesh is repeated alternately, and the last layer is pre-processed powder porous matrix, until the laminated composite structure of the designed size is obtained.

[0013] The layered composite structure of this invention is a biomimetic structure with the effect of a shell-like structure. It can effectively combine the high capillary force of porous powder with the high mechanical properties of wire mesh structure, thereby achieving synergistic enhancement of the properties of two different types of porous materials and providing a new material for the field of thermal management.

[0014] Compared with the prior art, the present invention has the following advantages: 1. The composite liquid-absorbing core of the present invention is formed by sintering a porous powder matrix and a metal wire mesh, combining the properties of both porous powder and wire mesh composite structures. The porosity characteristics of the porous powder matrix enable the control of the cooling medium during use, while the high strength of the metal wire mesh improves the mechanical properties of the composite liquid-absorbing core. This achieves synergistic enhancement of the properties of two different types of porous materials, meeting the comprehensive application performance requirements of the composite liquid-absorbing core, including heat exchange and mechanical properties.

[0015] 2. The powder porous and wire mesh laminated composite liquid wick of the present invention not only improves the problems of high thermal resistance and poor permeability of metal wire mesh liquid wicks, but also greatly improves the volumetric flow rate and capillary performance of powder porous liquid wicks, effectively realizing the separation of heat and working fluid transfer, improving the heat dissipation efficiency of heat pipes, that is, having high efficiency and stability in heat and mass transfer, while also improving the vibration resistance of powder porous liquid wicks, and within a certain range, preventing damage to powder porous liquid wicks caused by severe vibration.

[0016] 3. The powder porous and wire mesh stacked composite liquid absorbent core of the present invention has a simple preparation process, controllable pore characteristics, low cost and easy operation. It can be used as a metal functional material in the fields of high heat flux density, high power heat dissipation and thermal management of aerospace equipment as well as direct alcohol fuel cells. It can also be used as a new functional material in multiple fields such as vibration reduction and precision filtration.

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the structure of the powder porous and wire mesh laminated composite liquid absorbent core prepared in Example 1 of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of the powder porous and wire mesh stacked composite liquid absorbent core prepared in Example 3 of the present invention. Detailed Implementation

[0020] Example 1 The powder porous and wire mesh laminated composite liquid absorbent core of this embodiment is formed by sintering a titanium powder porous matrix and a titanium wire mesh. The titanium powder porous matrix has a diameter of 33 mm, a thickness of 0.15 mm, a porosity of 10%, and a maximum pore size of 1.5 μm. The surface of the titanium powder porous matrix has a nano-protrusion structure formed by spraying titanium oxide nanoparticle slurry onto the titanium powder porous matrix, with a thickness of 50 nm. The titanium wire mesh is a single-layer titanium wire mesh with a pore size of 20 μm.

[0021] The preparation method of the powder porous and wire mesh laminated composite liquid absorbent core in this embodiment includes the following steps: Step 1: Surface treatment of porous powder substrate A porous titanium powder matrix obtained by powder rolling, sintering, and dimensional machining is surface-treated using a treatment solution. After removal, it is cleaned with deionized water, then cleaned with anhydrous ethanol, and dried to obtain the treated porous titanium powder matrix. The composition of the treatment solution, by volume percentage, is: 1% HF acid (40% by mass), 2% HNO3 (68% by mass), 5% ethylene glycol, and the balance being water. Step 2: Pre-processing of the surface structure of the powder porous matrix 20g of titanium oxide particles with a particle size of 50nm were dispersed in an ethanol solution of polyvinyl butyral with a mass fraction of 3% to obtain a slurry with a solid content of 8%. The slurry was then sprayed onto the surface of the porous titanium powder matrix treated in step one to obtain a pre-processed porous titanium powder matrix. Step 3: Design and fabrication of the powder porous matrix and wire mesh laminated composite structure The CAXA software was used to design the composite structure of porous titanium powder matrix and titanium wire mesh. Then, the composite structure of porous titanium powder matrix and titanium wire mesh was processed according to the design model: a layer of pre-processed porous titanium powder matrix from step two was laid to form the first layer, a layer of titanium single-layer wire mesh was laid on the first layer to form the second layer, and a layer of pre-processed porous titanium powder matrix was laid on the second layer to form the third layer, resulting in a composite structure consisting of two layers of porous titanium powder matrix and one layer of titanium single-layer wire mesh stacked alternately. Step 4: Sintering of the laminated composite structure The multilayer composite structure obtained in step three is subjected to a vacuum degree not exceeding 9.0 × 10⁻⁶.-2 Sintering was carried out under the condition of Pa, the sintering temperature was 1250℃, and the holding time was 1.5h, to obtain a sintered body with a multilayer composite structure; Step 5: Post-processing The sintered multilayer composite structure obtained in step four is precisely machined to the target size according to the design drawings. It is then cleaned sequentially with deionized water and anhydrous ethanol, followed by treatment at 150℃ to remove organic contaminants and other impurities introduced during processing. This yields a powder porous and wire mesh multilayer composite liquid absorbent core, the structure of which is as follows: Figure 1 As shown.

[0022] Testing revealed that the thickness of the powder porous and wire mesh laminated composite liquid absorbent core obtained in this embodiment was 0.4 mm, and the porosity was 15%.

[0023] In step two of this embodiment, the composition of the nanoparticle slurry can also be replaced with titanium carbide, titanium tungstenide, or nickel.

[0024] Example 2 The difference between this embodiment and Embodiment 1 is as follows: the processing of the titanium powder porous matrix and titanium wire mesh laminated composite structure in step three is as follows: two identical pre-processed titanium powder porous matrix layers from step two are laminated to form the first layer, then a titanium single-layer wire mesh is laid on the first layer to form the second layer, and then two identical pre-processed titanium powder porous matrix layers from step two are laid on the second layer to form the third layer, and so on, alternatingly repeating the laying process of pre-processed titanium powder porous matrix and titanium single-layer wire mesh, with the last layer being a pre-processed titanium powder porous matrix, resulting in a laminated composite structure composed of 8 layers of titanium powder porous matrix and 7 layers of titanium single-layer wire mesh alternately stacked.

[0025] Testing revealed that the thickness of the powder porous and wire mesh laminated composite liquid absorbent core obtained in this embodiment was 1.6 mm, and the porosity was 25%.

[0026] Example 3 In this embodiment, the powder porous and wire mesh laminated composite liquid absorbent core is formed by sintering a 316L stainless steel powder porous matrix and a 316L stainless steel wire mesh. The 316L stainless steel powder porous matrix has a diameter of 13mm, a thickness of 2mm, a porosity of 55%, and a maximum pore size of 50μm. The surface of the 316L stainless steel powder porous matrix has a nano-protrusion structure formed by spraying copper nanoparticle slurry onto the 316L stainless steel powder porous matrix, with a thickness of 150nm. The 316L stainless steel wire mesh is a 316L stainless steel composite wire mesh with a pore size of 2μm obtained by rolling three layers of 316L stainless steel wire mesh with a pore size of 10μm.

[0027] The preparation method of the powder porous and wire mesh laminated composite liquid absorbent core in this embodiment includes the following steps: Step 1: Surface treatment of porous powder substrate A surface treatment solution was used to treat a porous matrix of 316L stainless steel powder obtained by direct sintering and dimensional processing of 316L stainless steel powder through a mold. After removal, the matrix was cleaned with deionized water, then cleaned with anhydrous ethanol, and dried to obtain the treated porous matrix of 316L stainless steel powder. The composition of the treatment solution, by volume percentage, was: 3% HF acid (40% by mass), 36% HNO3 (68% by mass), 10% ethylene glycol, and the balance being water. Step 2: Pre-processing of the surface structure of the powder porous matrix 50g of copper particles with a particle size of 30nm were dispersed in an ethanol solution of polyvinyl butyral with a mass fraction of 3% to obtain a slurry with a solid content of 15%. The slurry was then sprayed onto the surface of the 316L stainless steel powder porous matrix treated in step one to obtain a pre-processed 316L stainless steel powder porous matrix. Step 3: Design and fabrication of the powder porous matrix and wire mesh laminated composite structure The CAXA software was used to design a composite structure of 316L stainless steel powder porous matrix and 316L stainless steel wire mesh. Then, based on the model obtained from the design, the composite structure of 316L stainless steel powder porous matrix and 316L stainless steel wire mesh was processed: a layer of pre-processed 316L stainless steel powder porous matrix from step two was laid to form the first layer, then a layer of 316L stainless steel composite wire mesh was laid on the first layer to form the second layer, then a layer of pre-processed 316L stainless steel powder porous matrix was laid on the second layer to form the third layer, and so on, alternating the laying process of pre-processed 316L stainless steel powder porous matrix and 316L stainless steel composite wire mesh, with the last layer being pre-processed 316L stainless steel powder porous matrix, resulting in a composite structure consisting of 5 layers of 316L stainless steel powder porous matrix and 4 layers of 316L stainless steel composite wire mesh. Step 4: Sintering of the laminated composite structure The multilayer composite structure obtained in step three is subjected to a vacuum degree not exceeding 9.0 × 10⁻⁶. -2 Sintering was carried out under the condition of Pa, the sintering temperature was 950℃, and the holding time was 3.5h, to obtain a sintered body with a multilayer composite structure; Step 5: Post-processing The sintered multilayer composite structure obtained in step four is precisely machined to the target size according to the design drawings. It is then cleaned sequentially with deionized water and anhydrous ethanol, followed by treatment at 80℃ to remove organic contaminants and other impurities introduced during processing. This yields a powder porous and wire mesh multilayer composite liquid absorbent core, the structure of which is as follows: Figure 2 As shown.

[0028] Testing revealed that the thickness of the powder porous and wire mesh laminated composite liquid absorbent core obtained in this embodiment was 10 mm, and the porosity was 65%.

[0029] Example 4 In this embodiment, the powder porous and wire mesh laminated composite liquid absorbent core is formed by sintering an Inconel 625 nickel alloy powder porous matrix and an Inconel 625 nickel alloy wire mesh. The Inconel 625 nickel alloy powder porous matrix has a diameter of 13 mm, a thickness of 1 mm, a porosity of 35%, and a maximum pore size of 22 μm. The surface of the Inconel 625 nickel alloy powder porous matrix has a nano-protrusion structure formed by spraying nickel nanoparticle slurry onto the Inconel 625 nickel alloy powder porous matrix, with a thickness of 150 nm. The Inconel 625 nickel alloy wire mesh is an Inconel 625 nickel alloy composite wire mesh with a pore size of 15 μm formed by rolling four layers of single-layer Inconel 625 nickel alloy wire mesh with a pore size of 60 μm.

[0030] The preparation method of the powder porous and wire mesh laminated composite liquid absorbent core in this embodiment includes the following steps: Step 1: Surface treatment of porous powder substrate A surface treatment solution was used to treat a porous Inconel 625 nickel alloy powder matrix obtained by loosely sintering and dimensional machining of Inconel 625 nickel alloy powder using a treatment solution. After removal, the matrix was cleaned with deionized water, then cleaned with anhydrous ethanol, and dried to obtain the treated porous Inconel 625 nickel alloy powder matrix. The composition of the treatment solution, by volume percentage, was: 1.5% HF acid (40% mass concentration), 4.5% HNO3 (68% mass concentration), 8% ethylene glycol, and the balance being water. Step 2: Pre-processing of the surface structure of the powder porous matrix 30g of nickel particles with a particle size of 70nm were dispersed in an ethanol solution of polyvinyl butyral with a mass fraction of 5% to obtain a slurry with a solid content of 12%. The slurry was then sprayed onto the surface of the porous Inconel 625 nickel alloy powder matrix treated in step one to obtain a pre-processed porous Inconel 625 nickel alloy powder matrix. Step 3: Design and fabrication of the powder porous matrix and wire mesh laminated composite structure The Inconel 625 nickel alloy powder porous matrix and Inconel 625 nickel alloy wire mesh laminated composite structure were designed using CAXA software. Then, based on the designed model, the Inconel 625 nickel alloy powder porous matrix and Inconel 625 nickel alloy wire mesh laminated composite structure were fabricated: a layer of pre-fabricated Inconel 625 nickel alloy powder porous matrix from step two was laid to form the first layer, and then an Inconel 625 nickel alloy composite layer was laid on top of the first layer. The second layer is formed by the wire mesh, and then a layer of pre-processed Inconel 625 nickel alloy powder porous matrix is ​​laid on the second layer to form the third layer. This process is repeated alternately, with the last layer being the pre-processed Inconel 625 nickel alloy powder porous matrix. This results in a multilayered composite structure consisting of three layers of Inconel 625 powder porous matrix and two layers of Inconel 625 composite wire mesh. Step 4: Sintering of the laminated composite structure The multilayer composite structure obtained in step three was sintered in a hydrogen atmosphere with a hydrogen flow rate of 0.25 m³ / h. 3 / h, the sintering temperature is 1150℃, the holding time is 2h, and a layered composite structure sintered body is obtained; Step 5: Post-processing The sintered composite structure obtained in step four is precisely processed to the target size according to the design drawings. It is then cleaned with deionized water and anhydrous ethanol in sequence, and then treated at 220°C to remove organic pollutants and other impurities introduced during the processing, resulting in a powder porous and wire mesh multilayer composite liquid absorbent core.

[0031] Testing revealed that the thickness of the powder porous and wire mesh laminated composite liquid absorbent core obtained in this embodiment was 5 mm, and the porosity was 42%.

[0032] In this embodiment, the raw material metal powder for preparing the porous powder matrix can also be replaced with nickel powder or Inconel 718 nickel alloy powder.

[0033] Example 5 The difference between this embodiment and embodiment 4 is that the Inconel 625 nickel alloy wire mesh is an Inconel 625 nickel alloy composite wire mesh with a pore size of 30μm formed by rolling 5 layers of single-layer Inconel 625 nickel alloy wire mesh with a pore size of 100μm.

[0034] Testing revealed that the thickness of the powder porous and wire mesh laminated composite liquid absorbent core obtained in this embodiment was 8 mm, and the porosity was 48%.

[0035] Example 6 The powder porous and wire mesh laminated composite liquid absorbent core of this embodiment is formed by sintering a titanium powder porous matrix and a titanium wire mesh. The titanium powder porous matrix has a diameter of 33 mm, a thickness of 0.15 mm, a porosity of 10%, and a maximum pore size of 1.5 μm. The surface of the titanium powder porous matrix has a nano-protrusion structure formed by spraying titanium oxide nanoparticle slurry onto the titanium powder porous matrix, with a thickness of 300 nm. The titanium wire mesh is a single-layer titanium wire mesh with a pore size of 20 μm.

[0036] The preparation method of the powder porous and wire mesh laminated composite liquid absorbent core in this embodiment includes the following steps: Step 1: Surface treatment of porous powder substrate A porous titanium powder matrix, obtained by powder rolling, sintering, and dimensional machining, is surface-treated using a treatment solution. After removal, it is cleaned with deionized water, then cleaned with anhydrous ethanol, and dried to obtain the treated porous titanium powder matrix. The composition of the treatment solution, by volume percentage, is: 1% HF acid (40% by mass), 2% HNO3 (68% by mass), 5% ethylene glycol, and the balance being water. Step 2: Pre-processing of the surface structure of the powder porous matrix 20g of titanium oxide particles with a particle size of 20nm were dispersed in an ethanol solution of polyvinyl butyral with a mass fraction of 7% to obtain a slurry with a solid content of 8%. The slurry was then sprayed onto the surface of the porous titanium powder matrix treated in step one to obtain a pre-processed porous titanium powder matrix. Step 3: Design and fabrication of the powder porous matrix and wire mesh laminated composite structure The CAXA software was used to design the composite structure of porous titanium powder matrix and titanium wire mesh. Then, the composite structure of porous titanium powder matrix and titanium wire mesh was processed according to the design model: a layer of pre-processed porous titanium powder matrix from step two was laid to form the first layer, a layer of titanium wire mesh was laid on the first layer to form the second layer, and a layer of pre-processed porous titanium powder matrix was laid on the second layer to form the third layer, resulting in a composite structure consisting of two layers of porous titanium powder matrix and one layer of titanium wire mesh stacked alternately. Step 4: Sintering of the laminated composite structure The multilayer composite structure obtained in step three is subjected to a vacuum degree not exceeding 9.0 × 10⁻⁶. -2 Sintering was carried out under the condition of Pa, the sintering temperature was 1250℃, and the holding time was 1.5h, to obtain a sintered body with a multilayer composite structure; Step 5: Post-processing The sintered composite structure obtained in step four is precisely machined to the target size according to the design drawings. It is then cleaned with deionized water and anhydrous ethanol in sequence, and then treated at 500℃ to remove organic pollutants and other impurities introduced during the processing, resulting in a powder porous and wire mesh multilayer composite liquid absorbent core.

[0037] Testing revealed that the thickness of the powder porous and wire mesh laminated composite liquid absorbent core obtained in this embodiment was 0.4 mm, and the porosity was 15%.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the inventive essence shall still fall within the protection scope of the present invention.

Claims

1. A powder porous and wire mesh laminated composite wick, characterized in that, The composite wick is formed by sintering a powder porous substrate and a metal wire mesh of the same material after being stacked, wherein the powder porous substrate has a thickness of 0.15mm to 2mm, a porosity of 10% to 55%, and a maximum pore diameter of 1.5μm to 50μm, and the surface of the powder porous substrate has a nano-protrusion structure formed by spraying a nano-particle slurry onto the powder porous substrate, with a thickness of 50nm to 300nm; the metal wire mesh is a single-layer wire mesh or a composite wire mesh formed by rolling 2 to 5 layers of wire mesh, and the single-layer wire mesh has a pore diameter of 20μm to 100μm, and the composite wire mesh has a pore diameter of 2μm to 30μm; and the composite wick has a thickness of 0.4mm to 10mm and a porosity of 15% to 65%.

2. The powder-porous and wire mesh laminated composite wick of claim 1, wherein, The raw material metal powder for preparing the powder porous substrate is nickel powder, Inconel 625 nickel alloy powder, Inconel 718 nickel alloy powder, 316L stainless steel powder, or titanium powder.

3. The powder-porous and wire mesh laminated composite wick of claim 1, wherein, The powder porous substrate is obtained by sintering after powder rolling or directly obtained by loose sintering with a mold, and is subjected to size processing before use.

4. The powder-porous and wire mesh laminated composite wick of claim 2, wherein, When the raw material metal powder for preparing the powder porous substrate is nickel powder, Inconel 625 nickel alloy powder or Inconel 718 nickel alloy powder, the sintering is carried out in a hydrogen atmosphere when preparing the composite wick, and the hydrogen flow is 0.25 m 3 / h; when the raw material metal powder for preparing the powder porous substrate is 316L stainless steel powder or titanium powder, the sintering is carried out under vacuum when preparing the composite wick, and the vacuum degree is not more than 9.0 x 10 -2 Pa.

5. The powder-porous and wire mesh laminated composite wick of claim 1 wherein, The nano-particle slurry has a composition of titanium carbide, titanium tungsten, titanium oxide, nickel, or copper, and a particle size of 20nm to 70nm.

6. A method of making a powder-porous and wire mesh laminated composite wick according to any one of claims 1-5, characterized in that, The method comprises the following steps: Step one, surface treatment of the powder porous substrate The powder porous substrate is subjected to surface treatment with a treatment liquid, and after being taken out, is cleaned with deionized water, then cleaned with anhydrous ethanol and dried, to obtain a treated powder porous substrate; the treatment liquid has a composition of HF acid with a mass concentration of 40% of 1% to 3%, HNO3 with a mass concentration of 68% of 2% to 6%, ethylene glycol of 5% to 10%, and the balance being water; Step two, surface structure pre-processing of the powder porous substrate Nano-particles are dispersed into a polyvinyl butyl alcohol ethanol solution with a mass fraction of 3% to 7% to obtain a slurry with a solid content of 8% to 15%, and then the slurry is sprayed onto the surface of the treated powder porous substrate in step one to obtain a pre-processed powder porous substrate; Step three, design and processing of the powder porous substrate and wire mesh stacked composite structure CAXA software is used to design the powder porous substrate and wire mesh stacked composite structure, and then the powder porous substrate and wire mesh stacked composite structure is processed according to the model obtained by the design, to obtain a stacked composite structure; Step four, sintering of the stacked composite structure The stacked composite structure obtained in step three is sintered to obtain a sintered stacked composite structure; the sintering temperature is 950℃ to 1250℃, and the holding time is 1.5h to 3.5h; Step five, post-processing The sintered stacked composite structure obtained in step four is accurately processed to the target size according to the design drawing, and then cleaned with deionized water and anhydrous ethanol, and then treated at 80℃ to 500℃, to obtain a powder porous and wire mesh stacked composite wick.

7. The production method according to claim 6, wherein The processing procedure of the powder porous matrix and wire screen laminated composite structure in step three is as follows: one, two or three layers of the pre-processed powder porous matrix in step two are selected to form the first layer, then one layer of the metal wire screen with the same material as the pre-processed powder porous matrix in step two is laid on the first layer to form the second layer, and the same number of layers of the pre-processed powder porous matrix as the first layer is laid on the second layer to form the third layer, and so on, the laying process of the pre-processed powder porous matrix and the metal wire screen is repeated alternately, and the last layer is the pre-processed powder porous matrix, until the laminated composite structure with the designed size is obtained.

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