Porous ceramic matrix, preparation method, atomization core, and atomizer

Abstract

A porous ceramic matrix, a preparation method, an atomization core, and an atomizer. The porous ceramic matrix comprises a plurality of ceramic layers (a, c), and a bonding layer (b) for bonding adjacent ceramic layers (a, c). The bonding layer (b) is used to bond the adjacent ceramic layers (a, c), so that untight interlayer connection or even interlayer cracking caused by directly stacking the plurality of ceramic layers (a, c) can be avoided, thus effectively improving the strength of the porous ceramic matrix. In addition, the ceramic layers (a, c) and the bonding layer (b) in the porous ceramic matrix each have a certain porosity, and the porosities of the layers are arranged in a gradient manner in a stacking direction, so that the conduction rate of an atomization core to an atomization medium can be improved by means of the porosities in gradient arrangement and the atomization performance of the atomization core is improved, the propagation of fracture cracks can be resisted by means of a gradient structure having different porosities, and the strength of the porous ceramic matrix is further improved.

Description

A porous ceramic substrate, preparation method, atomizing core and atomizer

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to a Chinese patent application entitled “A porous ceramic substrate, preparation method, atomizer core and atomizer,” application number CN202311373574.9, filed on October 20, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field of porous ceramics, and in particular to a porous ceramic substrate, a preparation method, an atomizer core, and an atomizer. Background Art

[0004] The atomizer core is the core component of an atomizer device, used in medical atomization therapy and gas atomization technology. The most representative atomizer cores are cotton and ceramic. The main advantage of cotton cores is their high conduction rate to the medium to be atomized, rapid atomization, and ability to produce large amounts of mist in a short period of time. However, under uncertain power and atomization conditions, the core may become burnt, resulting in a relatively short lifespan. In contrast, ceramic cores produce finer atomized mist, a longer lifespan, and a more stable service life.

[0005] At present, the ceramic matrix used in the ceramic core is limited by the equipment, injection mold and slurry stability. A single ceramic matrix has only one porosity, which limits the ability of the ceramic to conduct the atomized medium. Although the porosity of the multilayer ceramic green body prepared in the prior art is no longer single, the multilayer ceramic green body is mainly prepared by cold isostatic pressing or hot pressing. This method easily makes the connection between the layers of the ceramic green body loose, and may even leave voids, thereby reducing the strength of the sintered ceramic matrix.

[0006] Summary of the Invention

[0007] The purpose of the present application is to solve at least one of the above-mentioned technical deficiencies, particularly the technical defect that the ceramic matrix in the prior art cannot improve the conduction rate of the atomized medium while taking into account the strength performance.

[0008] The present application provides a porous ceramic substrate, which includes a plurality of ceramic layers and a bonding layer for bonding adjacent ceramic layers, wherein the porosity of each layer is arranged in a gradient in the stacking direction.

[0009] Optionally, the slurry used to prepare each layer of the porous ceramic matrix includes a pore-forming agent, and the mass fraction of the pore-forming agent in the slurry used to prepare each layer of the porous ceramic matrix is ​​different.

[0010] Optionally, the slurry used to prepare each layer of the porous ceramic matrix includes a pore-forming agent, which is one or more of edible starch, carbon powder, sawdust, and microspheres. The types of pore-forming agents in the slurry used to prepare each layer of the porous ceramic matrix are different.

[0011] Optionally, the slurry used to prepare each layer of the porous ceramic matrix includes a pore-forming agent, and the pore-forming agent is one or more of edible starch, carbon powder, sawdust, and microspheres. The content and type of the pore-forming agent in the slurry used to prepare each layer of the porous ceramic matrix are different.

[0012] Optionally, the slurries used to prepare the various layers of the porous ceramic substrate have the same composition.

[0013] Optionally, the slurry used to prepare each layer of the porous ceramic substrate comprises, by mass fraction:

[0014] 30-60 parts by weight of ceramic powder;

[0015] 10 to 30 parts by weight of a sintering aid;

[0016] 10 to 30 parts by weight of a pore-forming agent;

[0017] 2 to 5 parts by weight of a dispersant;

[0018] 10 to 30 parts by weight of plasticizer;

[0019] 5 to 30 parts by weight of a binder;

[0020] 10 to 30 parts by weight of defoaming agent;

[0021] The balance is solvent.

[0022] Optionally, the ceramic powder is silicon dioxide;

[0023] And / or, the sintering aid is glass powder;

[0024] and / or, the solvent is ethanol;

[0025] And / or, the defoaming agent is n-butanol.

[0026] Optionally, the dispersant is ammonium polyacrylate, the plasticizer is dibutyl phthalate, and the binder is polyvinyl butyral.

[0027] Optionally, the shrinkage rates of the layers of the porous ceramic matrix are different, and the difference in shrinkage rates between two adjacent layers is within 2%.

[0028] The present application also provides a method for preparing a porous ceramic substrate as described in any one of the above embodiments, comprising:

[0029] Prepare at least two ceramic layer slurries and at least one bonding layer slurry having different mass fractions and / or types of pore-forming agents; wherein the total number of the bonding layer slurries is less than the total number of the ceramic layer slurries, and the difference is 1;

[0030] Forming each ceramic layer slurry into a plurality of ceramic green sheets;

[0031] stacking a plurality of the ceramic green sheets and applying a portion of bonding layer slurry between adjacent ceramic green sheets to obtain a ceramic green body;

[0032] sintering the ceramic green body to obtain a porous ceramic matrix;

[0033] The porous ceramic matrix includes a plurality of ceramic layers and a bonding layer for bonding adjacent ceramic layers, and the porosity of each layer is arranged in a gradient in the stacking direction.

[0034] Optionally, the step of preparing the ceramic layer slurry or the bonding layer slurry includes:

[0035] 30 to 60 parts by weight of ceramic powder, 10 to 30 parts by weight of a sintering aid, 10 to 30 parts by weight of a pore former, and 2 to 5 parts by weight of a dispersant are mixed with a solvent, and then ball milled for the first time to obtain a mixture;

[0036] 10 to 30 parts by weight of a plasticizer, 5 to 30 parts by weight of a binder, and 10 to 30 parts by weight of a defoamer are added to the mixture, followed by secondary ball milling to obtain a ceramic layer slurry or a bonding layer slurry.

[0037] Optionally, before the first ball milling, the method further comprises:

[0038] Zirconia ceramic balls are added in a mass ratio of 2:1 to the ceramic powder.

[0039] Optionally, forming each ceramic layer slurry into a plurality of ceramic green sheets comprises:

[0040] Each portion of ceramic layer slurry is introduced into a tape casting machine for tape casting; wherein the height adjustment range of the tape casting scraper in the tape casting machine is 0.5 mm to 2 mm;

[0041] Drying the cast ceramic layer slurry to obtain a plurality of cast green sheets;

[0042] A plurality of ceramic green sheets are obtained by punching each of the cast green sheets.

[0043] Optionally, before introducing each portion of ceramic layer slurry into a tape casting machine for tape casting, the method further comprises:

[0044] The rheological properties of each ceramic layer slurry were tested separately.

[0045] Optionally, sintering the ceramic green body to obtain a porous ceramic matrix comprises:

[0046] The ceramic green body is heated to 250-400° C. at a rate of 1-10° C. / min, kept warm for 30-60 minutes, and then heated again to 650-750° C. at a rate of 1-10° C. / min, kept warm for 60-120 minutes to obtain a porous ceramic matrix.

[0047] The present application also provides an atomizing core, comprising the porous ceramic substrate according to any one of the above embodiments, and metal slurry printed on the low-porosity surface of the porous ceramic substrate.

[0048] The present application also provides an atomizer, comprising the atomizing core described in the above embodiment.

[0049] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0050] The present application provides a porous ceramic substrate, a preparation method, an atomizer core and an atomizer, wherein the porous ceramic substrate includes a plurality of ceramic layers and a bonding layer for bonding adjacent ceramic layers. The present application uses an adhesive layer to bond adjacent ceramic layers, which can avoid directly stacking multiple ceramic layers, resulting in loose connections between the layers, or even interlayer cracking, thereby effectively improving the strength of the porous ceramic substrate. In addition, the present application uses an adhesive layer to bond the layers to prepare the porous ceramic substrate, without the need for hot pressing or cold isostatic pressing processes, thereby quickly improving the preparation efficiency of the porous ceramic substrate. In addition, the ceramic layer and the bonding layer in the porous ceramic substrate of the present application have a certain porosity, and the porosity of each layer is arranged in a gradient in the stacking direction. This can not only improve the conduction rate of the atomizer core to the atomization medium by the porosity arranged in a gradient, improve the atomization performance of the atomizer core, but also resist the extension of the fracture cracks by the gradient structure of different porosities, and further improve the strength of the porous ceramic substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0052] FIG1 is a schematic structural diagram of a porous ceramic substrate provided in an embodiment of the present application;

[0053] FIG2 is a schematic flow chart of a method for preparing a porous ceramic substrate provided in an embodiment of the present application;

[0054] FIG3 is a SEM image of a cross section of a porous ceramic substrate provided in an embodiment of the present application at a sintering rate of 50;

[0055] FIG4 is a SEM image of a sintered cross section of a porous ceramic substrate provided in an embodiment of the present application at a sintering rate of 100. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0057] At present, the ceramic matrix used in the ceramic core is limited by the equipment, injection mold and slurry stability. A single ceramic matrix has only one porosity, which limits the ability of the ceramic to conduct the atomized medium. Although the porosity of the multilayer ceramic green body prepared in the prior art is no longer single, the multilayer ceramic green body is mainly prepared by cold isostatic pressing or hot pressing. This method easily makes the connection between the layers of the ceramic green body loose, and may even leave voids, thereby reducing the strength of the sintered ceramic matrix.

[0058] Based on this, the present application proposes the following technical solutions to address the technical defects of the existing ceramic matrix in that it is unable to improve the conduction rate of the atomized medium while also taking into account the strength performance. Specifically, it includes the following:

[0059] In one embodiment, the present application provides a porous ceramic substrate, which includes a plurality of ceramic layers and a bonding layer for bonding adjacent ceramic layers, wherein the porosity of each layer is arranged in a gradient in the stacking direction.

[0060] In the present embodiment, the porous ceramic matrix is ​​a multilayer structure, which includes a plurality of ceramic layers and a bonding layer for bonding adjacent ceramic layers, so that the respective ceramic layers can be bonded by the bonding layer so that there are no cracks and pores between the adjacent ceramic layers, thereby improving the strength of the porous ceramic matrix. In addition, when the present application uses a bonding layer to bond the laminated layer to prepare the porous ceramic matrix, there is no need to consider how to stack the multiple ceramic layers, thereby reducing the use of processes such as hot pressing or cold isostatic pressing when preparing the porous ceramic matrix, thereby quickly improving the preparation efficiency of the porous ceramic matrix.

[0061] Among them, the ceramic layer of the present application is formed by sintering a ceramic green sheet with a certain thickness, and the bonding layer is formed by sintering the bonding layer slurry used to bond adjacent ceramic green sheets. The components between the two can be the same or different, and can be configured according to actual conditions, which is not limited here. In addition, when preparing the porous ceramic matrix, the present application can also reduce the organic content in the slurry used in each layer of the porous ceramic matrix according to actual conditions, so as to further improve the strength of the porous ceramic matrix.

[0062] It should be noted that the number of ceramic layers and the number of bonding layers in this application can be set according to the size of the product to be designed and the thickness of the ceramic layer. For example, when the size of the product after sintering is designed to be a sample with a thickness of 4.5mm * 2mm width * 2mm length, if the thickness of the ceramic layer is 0.45mm, then ten ceramic layers need to be superimposed and the length and width need to be cut into 2.23mm, so that the sample size of 4.5mm * 2mm * 2mm can be obtained after sintering. Therefore, when the required product size is smaller, fewer ceramic layers and bonding layers can be used. When the required product size is larger, more ceramic layers and bonding layers need to be used. Since the bonding layer is located between two adjacent ceramic layers, the total number of bonding layers is one less than the total number of ceramic layers.

[0063] Schematically, as shown in Figure 1, Figure 1 is a schematic structural diagram of the porous ceramic matrix provided in an embodiment of the present application; it can be seen from Figure 1 that the present application can construct a porous ceramic matrix through at least two ceramic layers and one bonding layer, such as a structure of ceramic layer (a)-bonding layer (b)-ceramic layer (c), and the three layers have different porosities, and the porosity of each layer is arranged in a gradient in the overlapping direction, which can not only improve the conduction speed of the porous ceramic matrix to the atomized medium, but also improve the strength of the porous ceramic matrix.

[0064] It should be noted that in this application, the porosity of each layer of the porous ceramic substrate is arranged in a gradient in the stacking direction, which means that the porosity of each layer is arranged in an increasing or decreasing trend in the stacking direction. The porosity difference between two adjacent layers can be the same or different, and the stacking direction of each layer when stacked can be horizontal, vertical, or other directions. The specific setting can be based on the equipment used to prepare the porous ceramic and is not limited here.

[0065] It is understandable that, in order to ensure the atomization performance of the porous ceramic matrix, the present application needs to prepare a ceramic layer or bonding layer with a certain porosity when preparing the ceramic layer and the bonding layer. In addition, since the porosity of each ceramic layer and the porosity of the ceramic layer and the bonding layer are different in the present application, when there are multiple bonding layers, the porosity between each bonding layer is also different, and thus when the present application prepares the ceramic layer slurry and the bonding layer slurry, the mass fraction and / or type of the pore former in the ceramic layer slurry and the bonding layer slurry can be adjusted to prepare ceramic layers and bonding layers with different porosities. Of course, the present application can also prepare ceramic layers and bonding layers with different porosities by other means, which are not limited here.

[0066] In the above embodiment, the porous ceramic matrix includes a plurality of ceramic layers and a bonding layer for bonding adjacent ceramic layers. The present application uses an adhesive layer to bond adjacent ceramic layers, which can avoid directly stacking multiple ceramic layers, resulting in loose connections between the layers, and even interlayer cracking, thereby effectively improving the strength of the porous ceramic matrix. In addition, the present application uses an adhesive layer to bond the laminated layers to prepare the porous ceramic matrix, without the need for hot pressing or cold isostatic pressing and other processes, thereby quickly improving the preparation efficiency of the porous ceramic matrix. In addition, the ceramic layer and the bonding layer in the porous ceramic matrix of the present application have a certain porosity, and the porosity of each layer is arranged in a gradient in the direction of superposition. This can not only improve the conduction rate of the atomizer core to the atomizing medium by the porosity arranged in a gradient, improve the atomization performance of the atomizer core, but also resist the extension of the fracture cracks by the gradient structure of different porosities, and further improve the strength of the porous ceramic matrix.

[0067] In one embodiment, the slurry used to prepare each layer of the porous ceramic substrate includes a pore former, and the mass fraction of the pore former in the slurry used to prepare each layer of the porous ceramic substrate is different.

[0068] In this embodiment, when preparing the porous ceramic substrate, in order to ensure the atomization performance of the porous ceramic substrate and improve the conduction rate of the atomization medium, it is necessary to prepare ceramic layers and bonding layers with different porosities, and arrange the porosity of each layer in a gradient in the overlapping direction.

[0069] Based on this, when preparing the slurry used for each layer of the porous ceramic matrix, the present application can appropriately add a certain mass fraction of pore-forming agent, and ensure that the mass fraction of the pore-forming agent in the slurry for preparing each layer of the porous ceramic matrix is ​​different, so as to ensure that the porosity of each layer in the prepared porous ceramic matrix is ​​different.

[0070] In one embodiment, the slurry used to prepare each layer of the porous ceramic matrix includes a pore-forming agent, which is one or more of edible starch, carbon powder, sawdust, and microspheres. The types of pore-forming agents in the slurry used to prepare each layer of the porous ceramic matrix are different.

[0071] In this embodiment, when preparing the slurry used for each layer of the porous ceramic substrate, a pore-forming agent may be appropriately added in a certain mass fraction, so that the prepared ceramic layer or bonding layer has a certain porosity.

[0072] Furthermore, since there are many types of pore-forming agents, such as edible starch, carbon powder, sawdust, PMMA microspheres, PS microspheres, etc., when using pore-forming agents to prepare the slurry used for each layer of the porous ceramic matrix, this application can select one or more of edible starch, carbon powder, sawdust, and microspheres as pore-forming agents. Of course, other types of pore-forming agents can also be selected, and this application does not limit this.

[0073] When the present application selects one or more types of pore-forming agents to prepare the slurry used for each layer of the porous ceramic matrix, the present application can ensure that the content of the pore-forming agent in the slurry used in each layer is the same, while making the types of pore-forming agents in the slurry of each layer different, so that a porous ceramic matrix with different porosities can be obtained; the present application can also ensure that the content of the pore-forming agent in the slurry used in each layer is different, while making the types of pore-forming agents in the slurry of each layer different, so that a porous ceramic matrix with different porosities can be obtained. The specific configuration can be made according to actual conditions and is not limited here.

[0074] In addition, since the present application can select one or more types of pore-forming agents to prepare the slurry used for each layer of the porous ceramic matrix, when the types of pore-forming agents of each layer of slurry in the present application are different, the types of pore-forming agents of each layer of slurry can be completely different, or the types of pore-forming agents of each layer of slurry can be the same type or different types, and it is just that the combination of different types leads to different types of pore-forming agents in each layer of slurry.

[0075] It is understandable that when different types of pore-forming agents are used, the shapes of the pores created are also different. For example, sawdust and edible starch are both relatively common pore-forming agents. The pores created by sawdust are fibrous, while the pores created by edible starch are spherical. The pores created by carbon powder are also spherical, but the particle sizes are different, so the porosity of the pores created will also be different. Of course, the oil conductivity of the mixed pore diameters created by mixing different types of pore-forming agents will also be higher. This application can be configured according to actual conditions and will not be elaborated here.

[0076] In one embodiment, the slurry used to prepare each layer of the porous ceramic matrix includes a pore-forming agent, and the pore-forming agent is one or more of edible starch, carbon powder, sawdust, and microspheres. The content and type of the pore-forming agent in the slurry used to prepare each layer of the porous ceramic matrix are different.

[0077] In this embodiment, when preparing a porous ceramic matrix, the slurry used for each layer thereof may include a pore former, which may be one or more of edible starch, carbon powder, sawdust, and microspheres. In order to obtain a porous ceramic matrix having different porosities, the present application may configure the pore former in the slurry of each layer of the porous ceramic matrix to have different contents and types of pore formers, thereby preparing ceramic layers and bonding layers with different porosities. After arranging the ceramic layers and bonding layers with different porosities in a gradient in the superposition direction, the porous ceramic matrix of the present application may be obtained.

[0078] In one embodiment, the composition of the slurry used to prepare each layer of the porous ceramic substrate is the same.

[0079] In this embodiment, the composition of the slurry used to prepare each layer of the porous ceramic substrate can be the same, so that the bonding layer for bonding adjacent ceramic layers can be better combined with the ceramic layer and prevent the generation of internal defects.

[0080] It can be understood that the composition of the slurry used to prepare each layer of the porous ceramic matrix in this application is the same, which means that the type of slurry used in each layer is the same, such as ceramic powder, sintering aid, pore-forming agent, dispersant, etc., but the mass fraction and / or type of the pore-forming agent in the slurry used in each layer is different, and the mass fractions of other types can be the same or different. In this way, porous ceramic matrices with different porosities can be obtained, and the quality and strength of the porous ceramic matrix can be guaranteed.

[0081] In one embodiment, the slurry used to prepare each layer of the porous ceramic substrate may include, by mass fraction:

[0082] 30 to 60 parts by weight of ceramic powder.

[0083] 10 to 30 parts by weight of sintering aid.

[0084] 10 to 30 parts by weight of pore-forming agent.

[0085] 2 to 5 parts by weight of dispersant.

[0086] 10 to 30 parts by weight of plasticizer.

[0087] 5 to 30 parts by weight of binder

[0088] 10 to 30 parts by weight of defoaming agent.

[0089] The balance is solvent.

[0090] In this embodiment, the slurry used to prepare each layer of the porous ceramic substrate includes but is not limited to ceramic powder, sintering aid, pore former, dispersant, plasticizer, binder, defoamer and solvent.

[0091] Among them, this application has no special restrictions on ceramic powders, and the types and models of ceramic powders familiar to those skilled in the art can be used. Those skilled in the art can select and adjust according to actual application conditions, product requirements and quality requirements. The ceramic powder of this application can be silicon dioxide or aluminum oxide, etc. In addition, this application has no special restrictions on other parameters of ceramic powders, and the parameters of conventional ceramic powders familiar to those skilled in the art can be used. Those skilled in the art can select and adjust according to actual application conditions, product requirements and quality requirements. The amount of ceramic powder added in this application can be 30 to 60 parts by weight.

[0092] Similarly, the present application does not particularly limit the sintering aids, pore formers, dispersants, plasticizers, binders, defoamers and solvents. The types, models and parameters familiar to those skilled in the art can be used. Those skilled in the art can select and adjust them according to actual application conditions, product requirements and quality requirements.

[0093] Specifically, the sintering aid of the present application can be a single additive or a composite additive composed of multiple different additives, such as CaO-MgO-SiO2 system, MnO2-TiO2-MgO system, CuO-TiO2 system, glass powder, etc., and the amount of the sintering aid added can be 10 to 30 parts by weight; the pore-forming agent of the present application can be one or more of edible starch, carbon powder, sawdust, and microspheres, and the amount of the pore-forming agent added can be 10 to 30 parts by weight; the dispersant of the present application can be an inorganic dispersant or an organic dispersant. Commonly used inorganic dispersants include silicates (such as water glass) and alkali metal phosphates (such as sodium tripolyphosphate, sodium hexametaphosphate and sodium pyrophosphate, etc.), and organic dispersants can include triethylhexyl phosphate, sodium lauryl sulfate, methyl amyl alcohol, cellulose derivatives, polyacrylamide, gum guar, fatty acid polyethylene glycol esters, etc., and the amount of the dispersant added can be 10 to 30 parts by weight. It can be 2 to 5 parts by weight; the plasticizer of the present application can be dibutyl phthalate (DBP), dioctyl phthalate (DOP), epoxy soybean oil, tricresyl phosphate, triphenyl phosphate, dioctyl sebacate, chlorinated paraffin, etc., and the added amount of the plasticizer can be 10 to 30 parts by weight; the binder of the present application can include starch, paraffin, carboxymethyl cellulose, polyvinyl alcohol, etc., and the added amount of the binder can be 5 to 30 parts by weight; the defoamer of the present application can include natural oils and modified products thereof, alcohols, synthetic fatty acids and fatty acid esters, amides, phosphates, organosilicon compounds, etc., and the added amount of the defoamer can be 10 to 30 parts by weight; the balance of the present application is a solvent, which can be one or more of water, acetone, ethanol, isopropanol, butanone, 2-pyrrolidone, xylene, n-butanol, propylene carbonate, propylene glycol methyl ether and butyl acetate, without limitation herein.

[0094] In addition, when preparing the porous ceramic matrix, the present application can reduce the organic matter content in the slurry used in each layer of the porous ceramic matrix according to actual conditions, such as by matching the composition of the slurry to a combination of inorganic substances as much as possible, or reducing the mass fraction of organic matter, etc., which can further improve the strength of the porous ceramic matrix.

[0095] In one embodiment, the ceramic powder is silicon dioxide.

[0096] And / or, the sintering aid is glass powder.

[0097] And / or, the solvent is ethanol.

[0098] And / or, the defoaming agent is n-butanol.

[0099] In this embodiment, the ceramic powder can be silicon dioxide. When the ceramic powder of this application is silicon dioxide, the sintering aid of this application can be glass powder or other types of sintering aids. The solvent of this application can be ethanol or other types of solvents. The defoaming agent of this application can also be n-butanol or other types of defoaming agents. The specific selection and adjustment can be made according to the actual application, product requirements and quality requirements, and there is no limitation here.

[0100] In one embodiment, the dispersant is ammonium polyacrylate, the plasticizer is dibutyl phthalate, and the binder is polyvinyl butyral.

[0101] In this application, since different dispersants, plasticizers, and binders are matched with each other, when a type of dispersant is selected, the types of plasticizer and binder are also fixed. For example, when ammonium polyacrylate is selected as the dispersant, the plasticizer used is dibutyl phthalate, and the binder is polyvinyl butyral, which can play a good auxiliary role in the preparation of the porous ceramic matrix.

[0102] In one embodiment, the shrinkage rates of the layers of the porous ceramic substrate are different, and the difference in shrinkage rates between two adjacent layers is within 2%.

[0103] In this embodiment, in order to ensure that the porous ceramic matrix obtained by sintering will not be deformed due to excessive difference in shrinkage rate between layers when preparing the porous ceramic matrix, the shrinkage rate of each layer of the porous ceramic matrix can be set to different values, and the difference in shrinkage rate between two adjacent layers is within 2%. In this way, a porous ceramic matrix that meets product requirements can be prepared.

[0104] In a specific example, as shown in Table 1, the present application can select a porous ceramic matrix with a three-layer structure (ceramic layer-bonding layer-ceramic layer) for experimentation, wherein the porosity of each layer is different. When one of the ceramic layers is a high-porosity layer, the other ceramic layer is a low-porosity layer, and the porosity of the bonding layer that bonds the two ceramic layers is between the two. When the difference in shrinkage between two adjacent layers is set to be within 2%, the porous ceramic matrix obtained after sintering does not warp. However, when the difference in shrinkage between two adjacent layers is set to be above 2%, the porous ceramic matrix obtained after sintering warps in the direction of high shrinkage. Because, in order to avoid the porous ceramic matrix from warping in the direction of high shrinkage, the present application controls the difference in shrinkage between two adjacent layers in the porous ceramic matrix to be within 2%. The specific contents of Table 1 are shown as follows:

[0105] Table 1 shows the effect of the shrinkage rate difference between layers on product deformation

[0106] In one embodiment, as shown in FIG2 , FIG2 is a schematic flow chart of a method for preparing a porous ceramic substrate provided in an embodiment of the present application; the present application also provides a method for preparing a porous ceramic substrate as described in any one of the above embodiments, which may include:

[0107] S110: preparing at least two ceramic layer slurries and at least one bonding layer slurry having different mass fractions of pore formers and / or different types of pore formers.

[0108] S120: Molding each portion of the ceramic layer slurry to obtain a plurality of ceramic green sheets.

[0109] S130: stacking a plurality of ceramic green sheets and applying a bonding layer slurry between adjacent ceramic green sheets to obtain a ceramic green body.

[0110] S140: Sintering the ceramic green body to obtain a porous ceramic matrix; wherein the porous ceramic matrix includes a plurality of ceramic layers and a bonding layer for bonding adjacent ceramic layers, and the porosity of each layer is arranged in a gradient in the stacking direction.

[0111] In this embodiment, when preparing a porous ceramic matrix, since the porous ceramic matrix of the present application has a variety of different porosities, and the bonding layer in the porous ceramic matrix is ​​used to bond two adjacent ceramic layers. Therefore, when preparing the ceramic layer slurry and the bonding layer slurry, the present application can prepare at least two ceramic layer slurries and at least one bonding layer slurry with different mass fractions of pore-forming agents and / or types of pore-forming agents, and the total number of bonding layer slurries is one less than the total number of ceramic layer slurries. In this way, a porous ceramic matrix containing a variety of different porosities can be prepared by using pore-forming agents of different mass fractions and / or types, and it can be ensured that each ceramic layer can be bonded by the bonding layer, thereby avoiding the use of hot pressing, cold treatment, etc. to stack the various ceramic layers.

[0112] Furthermore, after preparing at least two ceramic layer slurries and at least one bonding layer slurry, the present application can mold each ceramic layer slurry. The molding process includes but is not limited to dry pressing, cold isostatic pressing, slip casting, tape casting, gel molding, injection molding, etc. The specific molding process can be set according to the actual situation. For example, when considering the preparation cost issue, dry pressing, slip casting, gel molding, etc. can be preferably used; when considering the molding efficiency issue, dry pressing, tape casting, injection molding, etc. can be preferably used; when considering the molding uniformity issue, cold isostatic pressing, slip casting, tape casting, gel molding, etc. can be preferably used. Of course, when choosing which molding process to use, the influence of various factors can also be comprehensively considered to select the final molding process.

[0113] Furthermore, after preparing a plurality of ceramic green sheets, the present application can obtain a ceramic green body of the desired thickness by stacking each ceramic green sheet multiple times, and sintering the ceramic green body to obtain a porous ceramic matrix. During the stacking process, the present application can apply a bonding layer slurry between adjacent ceramic green sheets to ensure that there are no cracks and pores between adjacent ceramic layers, thereby improving the strength of the porous ceramic matrix. In addition, in order to improve the conduction rate of the porous ceramic matrix to the atomized medium, the present application can arrange the porosity of each ceramic green sheet from high to low or from low to high when stacking, and apply a layer of bonding layer slurry between adjacent ceramic green sheets. When preparing the bonding layer slurry, the mass fraction and / or type of the pore-forming agent in the ceramic layer slurry used for the adjacent ceramic green sheets can be set to be different, and the porosity of the prepared bonding layer is located between the adjacent ceramic green sheets, so that the porosity of each layer in the prepared porous ceramic matrix can be arranged in a gradient in the stacking direction.

[0114] Schematically, as shown in Figures 3 and 4, Figure 3 is a SEM image of the sintered cross-section of the porous ceramic matrix provided in an embodiment of the present application at a magnification of 50, and Figure 4 is a SEM image of the sintered cross-section of the porous ceramic matrix provided in an embodiment of the present application at a magnification of 100; it can be seen from Figures 3 and 4 that the porous ceramic matrix prepared by the preparation method of the present application can be observed to have a layered structure with different porosities between layers at a small magnification in Figure 3, and at a high magnification in Figure 4, it can be observed that the ceramic matrix of the present application is indeed a porous ceramic matrix.

[0115] In one embodiment, the step of preparing the ceramic layer slurry or the bonding layer slurry in S110 may include:

[0116] S111: 30 to 60 parts by weight of ceramic powder, 10 to 30 parts by weight of a sintering aid, 10 to 30 parts by weight of a pore former, and 2 to 5 parts by weight of a dispersant are mixed with a solvent, and then ball milled for the first time to obtain a mixture.

[0117] S112: adding 10 to 30 parts by weight of a plasticizer, 5 to 30 parts by weight of a binder, and 10 to 30 parts by weight of a defoamer to the mixture, and then performing secondary ball milling to obtain a ceramic layer slurry or a bonding layer slurry.

[0118] In this embodiment, when preparing the ceramic layer slurry or the bonding layer slurry, 30 to 60 parts by weight of ceramic powder, 10 to 30 parts by weight of a sintering aid, 10 to 30 parts by weight of a pore-forming agent, and 2 to 5 parts by weight of a dispersant can be mixed with a solvent, and then ball milled for the first time to obtain a mixture. Then, 10 to 30 parts by weight of a plasticizer, 5 to 30 parts by weight of a binder, and 10 to 30 parts by weight of a defoaming agent are added to the mixture, and then ball milled for a second time to obtain the ceramic layer slurry or the bonding layer slurry.

[0119] Furthermore, in the present application, a planetary ball mill can be used for both the first and second ball milling, and the speed during ball milling is 400-600 rad / min. The time range of the first and second ball milling is 2-5 hours. Preferably, the present application can set the first ball milling time to 4 hours and the second ball milling time to 3 hours. The ball milling speed is 500 rad / min.

[0120] The following application will use several specific examples to illustrate how to prepare ceramic layer slurry and bonding layer slurry, as follows:

[0121] Example 1: ① Preparation of a low-porosity ceramic layer slurry: 45 wt% SiO2, 17 wt% glass powder, 10 wt% edible starch, 2% sawdust, and 2% ammonium polyacrylate were placed in a ball mill, mixed with alcohol, and then ball milled for the first time. After the first ball milling, 15 wt% PVB (polyvinyl butyral) as a binder and 9 wt% DBP (dibutyl phthalate) as a plasticizer were added, and n-butanol was added as a defoaming agent before a second ball milling to obtain a low-porosity ceramic layer slurry a.

[0122] ② Preparation of high-porosity ceramic layer slurry: 40wt% SiO2, 15wt% glass powder, 15wt% edible starch, 4% sawdust, and 2% ammonium polyacrylate were placed in a ball mill, mixed with alcohol, and then ball milled for the first time. After the first ball milling, 15wt% PVB as a binder and 9wt% DBP as a plasticizer were added, and n-butanol was added as a defoaming agent, followed by a second ball milling to obtain high-porosity ceramic layer slurry c;

[0123] ③ Preparation of bonding layer slurry: 42wt% SiO2, 16wt% glass powder, 13wt% edible starch, 3% sawdust, and 2% ammonium polyacrylate were placed in a ball mill, and after adding alcohol and mixing, the first ball milling was performed. After the first ball milling, 15wt% PVB was added as a binder and 9wt% DBP was added as a plasticizer. In addition, n-butanol was added as a defoaming agent and then a second ball milling was performed to obtain bonding layer slurry b.

[0124] Example 2: ① Preparation of a low-porosity ceramic layer slurry: 45 wt% SiO2, 17 wt% glass powder, 10 wt% PMMA microspheres, and 2% ammonium polyacrylate were placed in a ball mill, mixed with alcohol, and then ball milled for the first time. After the first ball milling, 15 wt% PVB as a binder and 11 wt% DBP as a plasticizer were added, and n-butanol was added as a defoaming agent, followed by a second ball milling to obtain a low-porosity ceramic layer slurry a.

[0125] ② Preparation of high-porosity ceramic layer slurry: 42wt% SiO2, 15wt% glass powder, 15wt% PMMA microspheres, and 2% ammonium polyacrylate were placed in a ball mill, mixed with alcohol, and then ball milled for the first time. After the first ball milling, 15wt% PVB as a binder and 11wt% DBP as a plasticizer were added, and n-butanol was added as a defoaming agent before a second ball milling to obtain high-porosity ceramic layer slurry c;

[0126] ③ Preparation of bonding layer slurry: 43wt% SiO2, 16wt% glass powder, 13wt% PMMA microspheres, and 2% ammonium polyacrylate are placed in a ball mill, and after adding alcohol and mixing, the first ball milling is performed. After the first ball milling, 15wt% PVB as a binder and 11wt% DBP as a plasticizer are added. In addition, n-butanol is added as a defoaming agent and then a second ball milling is performed to obtain bonding layer slurry b.

[0127] Example 3: ① Preparation of a low-porosity ceramic layer slurry: 45 wt% SiO2, 17 wt% glass powder, 10 wt% PS microspheres, and 2% ammonium polyacrylate were placed in a ball mill, mixed with alcohol, and then ball milled for the first time. After the first ball milling, 15 wt% PVB as a binder and 11 wt% DBP as a plasticizer were added, and n-butanol was added as a defoaming agent, followed by a second ball milling to obtain a low-porosity ceramic layer slurry a.

[0128] ② Preparation of high-porosity ceramic layer slurry: 42 wt% SiO2, 15 wt% glass powder, 15 wt% PS microspheres, and 2% ammonium polyacrylate were placed in a ball mill, mixed with alcohol, and then ball milled for the first time. After the first ball milling, 15 wt% PVB as a binder and 11 wt% DBP as a plasticizer were added, and n-butanol was added as a defoaming agent before a second ball milling to obtain high-porosity ceramic layer slurry c;

[0129] ③ Preparation of bonding layer slurry: (b) 43wt% SiO2, 16wt% glass powder, 13wt% PS microspheres, and 2% ammonium polyacrylate were placed in a ball mill, and after adding alcohol and mixing, the mixture was ball milled for the first time. After the first ball milling, 15wt% PVB as a binder and 11wt% DBP as a plasticizer were added, and n-butanol was added as a defoaming agent, followed by a second ball milling to obtain bonding layer slurry b.

[0130] Through the above examples, the present application can obtain ceramic layers and bonding layers with different porosities. Of course, the above examples only take two ceramic layers and one bonding layer as an example. In actual applications, the required number of ceramic layers and bonding layers can be determined according to the product size, and then the above preparation method can be followed, and the type and / or mass fraction of the pore-forming agent in each slurry can be appropriately adjusted to obtain a porous ceramic matrix with different porosities.

[0131] Furthermore, the porous ceramic matrix prepared by different combinations of components in the present application has different average porosity, average compressive strength, and average pore size, as shown schematically in Table 2:

[0132] Table 2 shows the effects of the porous ceramic substrates prepared in various examples in various aspects.

[0133] In one embodiment, before the first ball milling, the following steps may also be included:

[0134] Zirconia ceramic balls are added in a mass ratio of 2:1 to the ceramic powder.

[0135] In this embodiment, when the ceramic powder is ball-milled for the first time, zirconia ceramic balls can be added for ball-milling. The mass ratio of zirconia ceramic balls to ceramic powder can be 2:1, which can achieve the effect of grinding, dispersion and homogenization, thereby improving the quality of the porous ceramic matrix.

[0136] In one embodiment, forming each ceramic layer slurry into a plurality of ceramic green sheets in S120 may include:

[0137] S121: introducing each portion of ceramic layer slurry into a tape casting machine for tape casting; wherein the height adjustment range of the tape casting scraper in the tape casting machine is 0.5 mm to 2 mm.

[0138] S122: Drying the cast ceramic layer slurry to obtain a plurality of cast green sheets.

[0139] S123: Punching each tape-cast green sheet to obtain a plurality of ceramic green sheets.

[0140] In this embodiment, for each portion of prepared ceramic layer slurry, the present application can introduce it into a casting machine for casting, and dry the cast ceramic layer slurry to obtain a cast green sheet, and then punch the cast green sheet to obtain a ceramic green sheet.

[0141] In a specific embodiment, the present application can introduce the ceramic layer slurry into the casting machine for casting, and the casting thickness can be adjusted by adjusting the position of the casting scraper, wherein the height adjustment range is 0.5mm~2mm. This can not only prevent the casting slurry from being too thin, resulting in too many layers required for subsequent lamination, but also avoid the collapse of the casting slurry after excessive casting under the equipment accuracy requirements. In addition, it can also avoid the uneven casting green sheet obtained by casting due to the difficulty in volatilization of organic matter.

[0142] Furthermore, in the present application, after the casting slurry is dried, a casting green sheet can be obtained, and the casting green sheet can be punched according to different structural designs to obtain ceramic green sheets with different structures.

[0143] The average strength of the ceramic green sheet prepared by the tape casting method of the present application is relatively high, as specifically illustrated in Table 3 below:

[0144] Table 3 is the comparison of compressive strength under different forming methods

[0145] It can be seen from Table 3 that when different molding methods are used to prepare compressive strength cylindrical samples with a diameter of 4 mm and a height of 6 mm, and the compressive strength is compared, the hot die casting strength can reach 26 MPa, the conventional flow through hot pressing or cold isostatic pressing lamination strength is 20 MPa, and the final average strength of the molding method of the present application is 33 MPa.

[0146] In addition, before each portion of the ceramic layer slurry is introduced into the tape casting machine for tape casting, the present application may further introduce each portion of the ceramic layer slurry into a vacuum degassing machine for degassing. The degassing time is set to 20-60 minutes, preferably 30 minutes, and the specific setting can be based on actual conditions and is not limited here. After the ceramic layer slurry is introduced into the vacuum degassing machine for degassing, a finer ceramic layer slurry can be obtained, which not only facilitates subsequent tape casting but also improves the quality of the porous ceramic substrate.

[0147] In one embodiment, before introducing each portion of ceramic layer slurry into a tape casting machine for tape casting, the following steps may also be performed:

[0148] The rheological properties of each ceramic layer slurry were tested separately.

[0149] In this embodiment, before each portion of ceramic layer slurry is introduced into the tape casting machine for tape casting, the present application can also test the rheological properties of each portion of ceramic layer slurry. For example, the present application can test the rheological characteristic parameters of the prepared ceramic layer slurry according to the conventional tape casting process to ensure that the viscosity of the ceramic layer slurry used during molding is between 1 and 3P·s, which will help with the subsequent tape casting molding.

[0150] In one embodiment, sintering the ceramic green body to obtain a porous ceramic matrix in S140 may include:

[0151] The ceramic green body is heated to 250-400° C. at a rate of 1-10° C. / min, kept warm for 30-60 minutes, and then heated again to 650-750° C. at a rate of 1-10° C. / min, kept warm for 60-120 minutes to obtain a porous ceramic matrix.

[0152] In this embodiment, when the ceramic green body is sintered into the porous ceramic matrix, it can be placed in a muffle furnace for sintering, and debinding is performed according to the debinding and sintering curve before sintering to obtain the final porous ceramic matrix.

[0153] Specifically, when the ceramic green body is placed in a muffle furnace for sintering, the muffle furnace can be heated to 250°C to 400°C at a rate of 1 to 10°C / min, kept warm for 30 to 60 minutes, and then heated to 650°C to 750°C at a rate of 1 to 10°C / min again, kept warm for 60 to 120 minutes, and then sintered to obtain a porous ceramic matrix. In a specific embodiment, the ceramic green body can be placed in a muffle furnace for sintering, and the temperature can be increased to 300°C at a rate of 5°C / min and kept warm for 40 minutes, and then continued to be heated to 670°C at a rate of 10°C / min and kept warm for 90 minutes, thereby obtaining the final gradient porous ceramic matrix.

[0154] In one embodiment, the present application further provides an atomizing core, comprising the porous ceramic substrate according to any one of the above embodiments, and metal slurry printed on a low-porosity surface of the porous ceramic substrate.

[0155] In this embodiment, during the process of preparing a porous ceramic matrix, the present application can print metal slurry, such as an Ag / Pd slurry resistance pattern, on the surface of a low-porosity ceramic green body. This method can prevent the porosity of the ceramic green body surface from being too high, resulting in defects such as short circuits or uneven lines in the printed pattern after sintering, thereby reducing the life of the ceramic core, while also ensuring the quality of the ceramic core.

[0156] In one embodiment, the present application further provides an atomizer, comprising the atomizing core described in the above embodiment.

[0157] In this embodiment, the atomizer may include an atomizing core, which includes the porous ceramic substrate described in any one of the above embodiments, and a metal slurry printed on the low-porosity surface of the porous ceramic substrate. The porous ceramic substrate includes multiple ceramic layers and a bonding layer for bonding adjacent ceramic layers. The present application uses an adhesive layer to bond adjacent ceramic layers, which can avoid the situation where the multiple ceramic layers are directly stacked, resulting in loose connections between the layers, or even interlayer cracks, thereby effectively improving the strength of the porous ceramic matrix. In addition, the present application uses an adhesive layer to bond the layers to prepare the porous ceramic matrix, without the need for hot pressing or cold isostatic pressing and other processes, thereby quickly improving the preparation efficiency of the porous ceramic matrix. In addition, the ceramic layer and the adhesive layer in the porous ceramic matrix of the present application have a certain porosity, and the porosity of each layer is arranged in a gradient in the stacking direction. This can not only improve the conduction rate of the atomizing core to the atomizing medium through the gradient arrangement of the porosity, thereby improving the atomization performance of the atomizing core, but also resist the extension of fracture cracks through the gradient structure of different porosities, and further improve the strength of the porous ceramic matrix.

[0158] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0159] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can be referenced to each other.

[0160] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A porous ceramic substrate, characterized in that: The porous ceramic matrix includes a plurality of ceramic layers and a bonding layer for bonding adjacent ceramic layers, and the porosity of each layer is arranged in a gradient manner in the stacking direction.

2. The porous ceramic substrate according to claim 1, characterized in that The slurry used to prepare each layer of the porous ceramic matrix includes a pore former, and the mass fraction of the pore former in the slurry used to prepare each layer of the porous ceramic matrix is ​​different.

3. A porous ceramic substrate according to any one of the preceding claims, characterized in that The slurry used to prepare each layer of the porous ceramic matrix includes a pore former, which is one or more of edible starch, carbon powder, sawdust, and microspheres. The types of pore formers in the slurry used to prepare each layer of the porous ceramic matrix are different.

4. A porous ceramic substrate according to any one of the preceding claims, characterised in that The slurry used to prepare each layer of the porous ceramic matrix includes a pore former, which is one or more of edible starch, carbon powder, sawdust, and microspheres. The content and type of the pore former in the slurry used to prepare each layer in the porous ceramic matrix are different.

5. A porous ceramic substrate according to any one of the preceding claims, characterised in that The composition of the slurry used to prepare each layer of the porous ceramic substrate is the same.

6. The porous ceramic substrate according to claim 5, characterized in that: The slurry used to prepare each layer of the porous ceramic substrate includes, by mass fraction: 30-60 parts by weight of ceramic powder; 10 to 30 parts by weight of sintering aid; 10 to 30 parts by weight of pore-forming agent; 2 to 5 parts by weight of dispersant; 10 to 30 parts by weight of plasticizer; 5 to 30 parts by weight of binder; 10 to 30 parts by weight of defoaming agent; The balance is solvent.

7. The porous ceramic substrate according to claim 6, characterized in that: The ceramic powder is silicon dioxide; And / or, the sintering aid is glass powder; And / or, the solvent is ethanol; And / or, the defoaming agent is n-butanol.

8. The porous ceramic substrate according to claim 6, characterized in that: The dispersant is ammonium polyacrylate, the plasticizer is dibutyl phthalate, and the binder is polyvinyl butyral.

9. A porous ceramic substrate according to any one of the preceding claims, characterised in that The shrinkage rates of the various layers of the porous ceramic matrix are different, and the difference in shrinkage rates between two adjacent layers is within 2%.

10. A method for preparing a porous ceramic substrate according to any one of the preceding claims, characterized in that: include: Prepare at least two ceramic layer slurries and at least one bonding layer slurry with different mass fractions of pore formers and / or types of pore formers; wherein the total number of the bonding layer slurries is less than the total number of the ceramic layer slurries, and the difference is 1; After each ceramic layer slurry is formed, a plurality of ceramic green sheets are obtained; Stacking a plurality of the ceramic green sheets and applying a portion of bonding layer slurry between adjacent ceramic green sheets to obtain a ceramic green body; Sintering the ceramic green body to obtain a porous ceramic matrix; The porous ceramic matrix includes a plurality of ceramic layers and a bonding layer for bonding adjacent ceramic layers, and the porosity of each layer is arranged in a gradient manner in the stacking direction.

11. The preparation method according to claim 10, characterized in that: The step of preparing the ceramic layer slurry or the bonding layer slurry comprises: By weight, 30 to 60 parts by weight of ceramic powder, 10 to 30 parts by weight of a sintering aid, 10 to 30 parts by weight of a pore former, and 2 to 5 parts by weight of a dispersant are mixed with a solvent, and then ball milled for the first time to obtain a mixture; 10 to 30 parts by weight of a plasticizer, 5 to 30 parts by weight of a binder, and 10 to 30 parts by weight of a defoamer are added to the mixture, followed by secondary ball milling to obtain a ceramic layer slurry or a bonding layer slurry.

12. The preparation method according to claim 11, characterized in that: Before the first ball milling, the method further comprises: Zirconia ceramic balls are added in a mass ratio of 2:1 to the ceramic powder.

13. The preparation method according to any one of claims 10 to 12, characterized in that: The method of molding each ceramic layer slurry to obtain a plurality of ceramic green sheets comprises: Each portion of the ceramic layer slurry is introduced into a tape casting machine for tape casting; wherein the height adjustment range of the tape casting scraper in the tape casting machine is 0.5 mm to 2 mm; Drying the cast ceramic layer slurry to obtain a plurality of cast green sheets; Each of the cast green sheets is punched to obtain a plurality of ceramic green sheets.

14. The preparation method according to claim 13, characterized in that: Before each portion of the ceramic layer slurry is introduced into the tape casting machine for tape casting, the method further comprises: The rheological properties of each ceramic layer slurry were tested separately.

15. The preparation method according to any one of claims 10 to 14, characterized in that: The method of sintering the ceramic green body to obtain a porous ceramic matrix comprises: The ceramic green body is heated to 250°C-400°C at 1-10°C / min, kept warm for 30-60min, and then heated to 650°C-750°C at 1-10°C / min again, kept warm for 60-120min to obtain a porous ceramic matrix.

16. An atomizer core, characterized in that: The porous ceramic substrate comprises the porous ceramic substrate according to any one of claims 1 to 9, and metal paste printed on the low-porosity surface of the porous ceramic substrate.

17. An atomizer, characterized in that: Comprising the atomizer core as described in claim 16.

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