Sintered porous metal film sintering precursor and sintered porous metal film
By coating an organic polymer layer and a metal powder layer onto a metal wire mesh, the problems of macropore defects and high cost in sintered porous metal membranes are solved, achieving cost reduction and improved filtration performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU INTERMENT TECH
- Filing Date
- 2025-06-26
- Publication Date
- 2026-07-10
AI Technical Summary
Existing methods for preparing sintered porous metal membranes suffer from problems such as the formation of large pores due to the infiltration of metal powder slurry into the metal wire mesh and high material costs.
Using a metal wire mesh with a mesh size of 80-150 mesh as the substrate, an organic polymer coating layer is coated on one side to fill the pores, and a metal powder coating layer is coated on the other side. After sintering, a sintered metal thin film layer is formed that is only connected to one side of the metal wire mesh, thus avoiding large pore defects and reducing material costs.
It effectively prevents the formation of large pore defects, reduces manufacturing costs, improves the utilization rate of metal powder, reduces filtration resistance, and improves filtration efficiency.
Smart Images
Figure CN224475606U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the structure of sintered porous metal materials, specifically to a sintering precursor for a sintered porous metal film and a sintered porous metal film. Background Technology
[0002] Sintered porous metal membranes have excellent mechanical strength, thermal stability, chemical stability and controllable pore structure, and are widely used in gas-solid separation and liquid-solid separation.
[0003] The applicant's existing method for preparing sintered porous metal membranes typically uses a metal wire mesh with a mesh size of 200 mesh or higher as the substrate. Then, a metal powder slurry is applied to both sides of the wire mesh to form a sintering precursor with a metal powder coating on both sides. Finally, the sintering precursor is sintered to form a composite sintered porous metal membrane. The use of a metal wire mesh with a mesh size of 200 mesh or higher is primarily to ensure a sufficiently high density of mesh openings on the substrate, thereby guaranteeing adequate slurry application.
[0004] The sintered porous metal membranes prepared by the above-mentioned method have the following problems: First, because the metal powder slurry can penetrate into the mesh of the metal wire mesh, large pore defects are easily formed after sintering, which also increases the amount of metal powder used. Second, metal wire meshes with a mesh size of 200 mesh or higher are relatively fine, and the cost of such metal wire meshes is relatively high, thus increasing the cost of the sintered porous metal membrane. Utility Model Content
[0005] The purpose of this invention is to provide a sintering precursor and a sintering porous metal membrane, which solves the technical problem of avoiding the formation of large pore defects, reducing manufacturing costs, and improving the filtration performance of sintering porous metal membranes.
[0006] In a first aspect, a sintering precursor for a porous metal membrane is provided, comprising: a substrate, wherein the substrate is a metal wire mesh with a mesh size of 80-150 mesh; an organic polymer coating layer, wherein the organic polymer coating layer is coated on a first side of the metal wire mesh and fills the pores of the metal wire mesh; and a metal powder coating layer, wherein the metal powder coating layer is coated on a second side of the metal wire mesh.
[0007] As an optimization and / or instantiation of the above-mentioned sintering precursor for porous metal films, further: the mesh size of the metal wire mesh is 90 mesh, 100 mesh, 110 mesh, 120 mesh or 140 mesh.
[0008] As an optimization and / or instantiation of the above-mentioned sintering precursor for porous metal membranes, the organic polymer coating layer is further composed of methylcellulose, hydroxypropyl methylcellulose, polyvinyl alcohol, acrylic polymers, carboxymethyl cellulose, hydroxyethyl cellulose, gelatin, or agar.
[0009] As an optimization and / or instantiation of the above-mentioned sintering precursor for porous metal films, further: the metal mesh is made of stainless steel or nickel-chromium alloy.
[0010] As an optimization and / or instantiation of the above-mentioned sintering precursor for porous metal films, further: the metal powder coating layer is composed of nickel metal powder or nickel alloy raw material powder.
[0011] As an optimization and / or instantiation of the above-mentioned sintering precursor for porous metal films, further: the nickel alloy raw material powder is Ni-Cr alloy powder.
[0012] In a second aspect, a sintered porous metal membrane is provided, comprising: a substrate, wherein the substrate is a metal wire mesh with a mesh size of 80-150 mesh; and a sintered metal thin film layer, wherein the sintered metal thin film layer is connected only to one side of the metal wire mesh, such that the mesh structure on the other side of the metal wire mesh protrudes from the sintered metal thin film layer.
[0013] As an optimization and / or instantiation of the above-mentioned sintered porous metal film, further: the mesh count of the metal wire mesh is 90 mesh, 100 mesh, 110 mesh, 120 mesh or 140 mesh.
[0014] As an optimization and / or instantiation of the above-mentioned sintered porous metal film, further: the average pore size of the sintered metal film layer is 0.1 micrometers to 50 micrometers, the thickness is 50 micrometers to 1500 micrometers, and the porosity is 30% to 60%.
[0015] As an optimization and / or instance of the above-mentioned sintered porous metal film, further: the metal mesh is made of stainless steel or nickel-chromium alloy; the sintered metal thin film layer is made of sintered porous nickel film or sintered porous nickel alloy film; the sintered porous nickel alloy film is a sintered porous Ni-Cr alloy film.
[0016] The sintering porous metal membrane precursor and sintering porous metal membrane provided by this utility model are achieved by coating an organic polymer coating layer on the first side of a metal wire mesh with a mesh size of 80-150 mesh, filling the pores of the metal wire mesh, and coating a metal powder coating layer on the second side of the metal wire mesh. This ensures that the sintered metal film layer formed after sintering is only connected to one side of the metal wire mesh. This structure has the following advantages: First, the organic polymer coating layer (which can completely volatilize during sintering) fills the pores of the metal wire mesh, effectively preventing the metal powder slurry from seeping into the mesh openings and avoiding the formation of large pores after sintering. The advantages of this design include: firstly, the use of 80-150 mesh metal wire as the substrate significantly reduces material costs and manufacturing costs compared to traditional 200 mesh or higher metal wire; secondly, the use of 80-150 mesh metal wire as the substrate facilitates the filling of the pores by the organic polymer coating layer; thirdly, the structural design of the sintered metal film layer being connected only to one side of the metal wire reduces the path length of the filtered material and lowers filtration resistance; and fourthly, this structure also reduces the amount of metal powder used and improves the utilization rate of metal powder.
[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Additional aspects and advantages provided by the present invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the metal mesh used in the preparation of the sintering precursor for the porous metal membrane according to an embodiment of this utility model.
[0019] Figure 2 This is a schematic diagram of the structure after an organic polymer coating layer is coated on a metal wire mesh during the preparation of the sintering precursor of the sintered porous metal membrane in an embodiment of this utility model.
[0020] Figure 3 This is a schematic diagram of the sintering precursor of the sintered porous metal film according to an embodiment of the present invention.
[0021] Figure 4 This is a schematic diagram of the structure of the sintered porous metal film according to an embodiment of the present invention.
[0022] The following are labeled in the figure: metal wire mesh 10, organic polymer coating layer 20, metal powder coating layer 30, sintered metal thin film layer 40, sintered porous metal film sintering precursor 100, and sintered porous metal film 200. Detailed Implementation
[0023] The present invention will now be clearly and completely described in conjunction with the accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly noted that:
[0024] The technical solutions and features provided in the various sections, including the following description, can be combined with each other without conflict. Furthermore, where possible, these technical solutions, features, and related combinations can be given specific technical subject matter and protected by relevant patents.
[0025] The embodiments of the present invention described below are generally only some embodiments and not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of patent protection.
[0026] The terms "comprising," "including," "having," and any variations thereof in this specification, the corresponding claims, and related sections are intended to cover non-exclusive inclusion. Other related terms and units can be reasonably interpreted based on the relevant content provided in this specification.
[0027] like Figure 1 As shown, in the preparation process of the sintering precursor for the porous metal film in this embodiment of the invention, a metal wire mesh 10 with a mesh size of 80-150 mesh is first selected as the substrate. Compared with traditional metal wire meshes with a mesh size of 200 mesh or higher, this metal wire mesh 10 has a larger pore size and lower cost. The preferred mesh size of the metal wire mesh 10 is 90 mesh, 100 mesh, 110 mesh, 120 mesh, or 140 mesh. The metal wire mesh 10 can be made of stainless steel or nickel-chromium alloy, which have good mechanical strength, corrosion resistance, and high temperature resistance.
[0028] like Figure 2 As shown, an organic polymer coating layer 20 is coated on the first side of the metal mesh 10, filling the pores of the metal mesh 10. The organic polymer coating layer 20 can be composed of methylcellulose, hydroxypropyl methylcellulose, polyvinyl alcohol, acrylic polymers, carboxymethyl cellulose, hydroxyethyl cellulose, gelatin, or agar. These organic polymer materials can completely volatilize during the sintering process and will not affect the performance of the final product. The main function of the organic polymer coating layer 20 is to fill the pores of the metal mesh 10, preventing the subsequently coated metal powder slurry from seeping into the mesh and forming large pore defects. It is worth noting that metal mesh 10 with a mesh size of 80-150 mesh has larger pores, making it easier for the organic polymer coating layer 20 to fully fill its pores.
[0029] like Figure 3As shown, the complete structure of the sintering porous metal membrane sintering precursor 100 in this embodiment of the present invention includes: a substrate, namely the metal wire mesh 10 with a mesh size of 80-150; an organic polymer coating layer 20, which is coated on the first side of the metal wire mesh 10 and fills its pores; and a metal powder coating layer 30, which is coated on the second side of the metal wire mesh 10.
[0030] The metal powder coating layer 30 can be made of nickel metal powder or nickel alloy raw material powder, with Ni-Cr alloy powder being the preferred choice. Ni-Cr alloy has excellent high-temperature strength, oxidation resistance, and corrosion resistance, making it suitable for high-temperature flue gas filtration and dust removal. Since the organic polymer coating layer 20 fills the pores of the metal mesh 10, the metal powder coating layer 30 will not penetrate the mesh, thus avoiding the formation of large pore defects, while reducing the amount of metal powder used and improving the utilization rate of metal powder.
[0031] like Figure 4 As shown, the sintered porous metal membrane 200 of this embodiment is formed by sintering the aforementioned sintered porous metal membrane precursor 100. The sintered porous metal membrane 200 includes: a substrate, namely a metal wire mesh 10 with a mesh size of 80-150 mesh; and a sintered metal thin film layer 40, which is only connected to one side of the metal wire mesh 10. During the sintering process, the organic polymer coating layer 20 completely volatilizes, while the metal powder coating layer 30 is sintered to form the sintered metal thin film layer 40, which is only connected to one side of the metal wire mesh 10. This single-sided connection structure reduces the path length of the filtered material, lowers the filtration resistance, and improves the filtration efficiency.
[0032] The sintered metal thin film layer 40 has an average pore size of 0.1 μm to 50 μm, a thickness of 50 μm to 1500 μm, and a porosity of 30% to 60%. These parameter ranges allow the sintered porous metal membrane 200 to possess both good filtration accuracy and appropriate mechanical strength and air permeability. The sintered metal thin film layer 40 can be composed of a sintered porous nickel membrane or a sintered porous nickel alloy membrane, wherein the sintered porous nickel alloy membrane can be a sintered porous Ni-Cr alloy membrane.
[0033] like Figure 4As shown, the sintered porous metal membrane 200 of this embodiment has unique surface features: the surface on one side where the sintered metal film layer 40 is located is flat and smooth (serving as a filter surface), while on the other side, the slightly protruding mesh structure of the metal mesh 10 can be clearly observed. This surface feature is determined by the unique preparation process of this invention: because the organic polymer coating layer completely volatilizes during the sintering process, and the metal powder coating layer 30 is only sintered on the second side of the metal mesh 10 to form the sintered metal film layer 40, the first side of the metal mesh 10 retains its original mesh structure. This surface feature can also serve as a direct identification feature of the sintered porous metal membrane of this invention, facilitating product quality control and market identification.
[0034] Experimental Example
[0035] The specific steps for preparing a sintered porous metal membrane are as follows: First, a 100-mesh stainless steel wire mesh is selected as the substrate (e.g., Figure 1 (As shown); Coat the first side of the stainless steel wire mesh with a 2% hydroxypropyl methylcellulose aqueous solution (2 grams of hydroxypropyl methylcellulose dissolved in 100 ml of water to form a honey- or syrup-like aqueous solution), filling the mesh pores (as shown). Figure 2 As shown); after the organic polymer coating layer dries (forming the organic polymer coating layer), a metal powder coating layer using Ni-Cr alloy powder (weight ratio Ni:Cr=80:20, this Ni-Cr alloy powder can be purchased commercially) is coated on the second side of the stainless steel wire mesh to form a sintering precursor for a sintered porous metal film (such as...). Figure 3 (As shown); the sintering precursor was heated to 950°C at a heating rate of 5°C / min under a hydrogen protective atmosphere and held at that temperature for 2 hours to form a sintered porous metal film (e.g. Figure 4 (As shown).
[0036] The resulting sintered porous metal membrane has the following characteristics: the average pore size of the sintered metal film layer is 5 micrometers, the thickness is 200 micrometers, the porosity is 45%, and it is only connected to one side of the metal mesh. Compared with traditional sintered porous metal membranes using metal mesh of 200 mesh or higher, the cost of the sintered porous metal membrane material prepared in this embodiment is reduced by about 8%, and the filtration resistance is reduced by about 10%.
[0037] The foregoing has described the relevant content of this utility model. Those skilled in the art will be able to implement this utility model based on these descriptions. All other embodiments obtained by those skilled in the art based on the foregoing content of this specification without inventive effort should fall within the scope of this utility model.
Claims
1. A sintering precursor for porous metal films, characterized in that: include: The substrate is a metal wire mesh with a mesh size of 80-150 mesh; An organic polymer coating layer is applied to the first side of the metal mesh and fills the pores of the metal mesh. And a metal powder coating layer, which is coated on the second side of the metal mesh.
2. The sintering precursor for sintered porous metal films as described in claim 1, characterized in that: The mesh count of the metal wire mesh is 90 mesh, 100 mesh, 110 mesh, 120 mesh or 140 mesh.
3. The sintering precursor for sintered porous metal films as described in claim 1, characterized in that: The organic polymer coating layer is composed of methylcellulose, hydroxypropyl methylcellulose, polyvinyl alcohol, acrylic polymers, carboxymethyl cellulose, hydroxyethyl cellulose, gelatin, or agar.
4. The sintering precursor for sintered porous metal films as described in claim 1, characterized in that: The wire mesh is made of stainless steel or nickel-chromium alloy.
5. The sintering precursor for sintered porous metal films as described in claim 1, characterized in that: The metal powder coating layer uses nickel metal powder or nickel alloy raw material powder.
6. The sintering precursor for sintered porous metal films as described in claim 5, characterized in that: The nickel alloy raw material powder used is Ni-Cr alloy powder.
7. A sintered porous metal film, characterized in that: include: The substrate is a metal wire mesh with a mesh size of 80-150 mesh; And a sintered metal thin film layer, which is connected only to one side of the metal wire mesh, such that the mesh structure on the other side of the metal wire mesh protrudes from the sintered metal thin film layer.
8. The sintered porous metal film as described in claim 7, characterized in that: The mesh count of the metal wire mesh is 90 mesh, 100 mesh, 110 mesh, 120 mesh or 140 mesh.
9. The sintered porous metal film as described in claim 7, characterized in that: The sintered metal thin film layer has an average pore size of 0.1 μm-50 μm, a thickness of 50 μm-1500 μm, and a porosity of 30%-60%.
10. The sintered porous metal film as described in claim 7, characterized in that: The metal wire mesh is made of stainless steel or nickel-chromium alloy; the sintered metal thin film layer is made of sintered porous nickel film or sintered porous nickel alloy film; the sintered porous nickel alloy film is a sintered porous Ni-Cr alloy film.