Composite atomizing core and preparation method thereof

Abstract

The invention relates to the technical field of atomization, in particular to a composite atomization core and a preparation method thereof. Comprising a porous ceramic core material and an inorganic fiber aerogel layer coating the outer side of the porous ceramic core material. The composite atomizing core has super-strong tar locking performance, tobacco tar leakage can be avoided, and the atomizing effect is improved. Meanwhile, the composite atomizing core has excellent high-temperature stability and chemical stability, is not prone to oxidation, corrosion and core pasting, and can effectively solve the problems that a traditional atomizing core is poor in heat resistance and chemical stability. Meanwhile, the composite atomizing core is high in mechanical strength and not prone to deformation.

Description

Technical Field

[0001] The present application relates to the field of atomization technology, and in particular to a composite atomization core and a preparation method thereof. Background Art

[0002] Atomizer cores have broad application prospects in many fields such as electronic cigarette atomizers, medical treatment, environmental protection engineering, chemical separation and catalytic reactions. In electronic cigarette atomizers, the atomizer core converts the smoke oil liquid into mist under heating. In medical treatment, atomizer cores are mainly used in drug delivery systems, especially in the treatment of respiratory diseases. Atomizer cores can atomize drugs into tiny particles, which can be absorbed by the respiratory tract, thereby improving the therapeutic efficiency of drugs. In environmental protection engineering, atomizer cores are mainly used in various spray systems to reduce pollutants in the air and water. In chemical separation, atomizer cores are mainly used to separate liquid or solid mixtures into different components. In catalytic reactions, atomizer cores can improve the contact efficiency between catalysts and reactants, thereby accelerating the speed of chemical reactions.

[0003] The atomizer core is usually a porous ceramic atomizer core. For example, the porous ceramic atomizer core in the electronic cigarette atomizer is responsible for converting the e-liquid liquid into mist under heat. Compared with the traditional cotton core, the porous ceramic atomizer core is widely popular due to its stable atomization effect.

[0004] However, the porous ceramic atomizer core still has defects such as oil leakage, poor heat resistance and poor chemical stability during use. Summary of the invention

[0005] Based on this, the first aspect of the present application provides a composite atomizer core, and its technical solution is as follows:

[0006] A composite atomization core comprises a porous ceramic core material and an inorganic fiber aerogel layer coated on the outer side of the porous ceramic core material.

[0007] The second aspect of the present application provides a method for preparing a composite atomizer core, and its technical solution is as follows:

[0008] A method for preparing a composite atomizer core comprises the following steps: coating the inorganic fiber aerogel layer on the outside of the porous ceramic core material.

[0009] Compared with the traditional solution, this application has the following beneficial effects:

[0010] The present application coats an inorganic fiber aerogel layer on a porous ceramic core material, and the resulting composite atomizer core has a super strong oil-locking performance, which can effectively avoid the leakage of tobacco oil and improve the atomization effect. At the same time, the holes of the porous ceramic core and the inorganic fiber aerogel are staggered, so that the atomization of the tobacco oil is more layered and the taste is improved. The composite atomizer core also has excellent high-temperature stability and excellent chemical stability, is not easy to oxidize, corrode and stick to the core, and can effectively improve the problems of poor heat resistance and poor chemical stability of traditional atomizer cores. At the same time, the composite atomizer core has high mechanical strength and is not easy to deform. The composite atomizer core of the present application can be used in multiple fields such as electronic cigarette atomizers, medical treatment, environmental protection engineering, chemical separation and catalytic reactions to meet the market's demand for high efficiency, safety and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application and to more completely understand the present application and its beneficial effects, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0012] Figure 1 It is a front view structural schematic diagram of a composite atomizer core according to one embodiment;

[0013] Figure 2 It is a schematic diagram of the side structure of a composite atomizer core according to one embodiment. DETAILED DESCRIPTION

[0014] The present application will be further described in detail below in conjunction with specific embodiments. The present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly understood.

[0015] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0016] the term

[0017] Unless otherwise specified or incompatible herewith, the terms and phrases used herein shall have the following meanings:

[0018] In the present application, the selection scope involving "and / or", "or / and", and "and / or" includes any one of two or more related listed items, and also includes any and all combinations of the related listed items, and the any and all combinations include any two related listed items, any more related listed items, or a combination of all related listed items.

[0019] In the present application, "plurality", "multiple", "multiple times", "plurality", etc., unless otherwise specified, refer to a number greater than 2 or equal to 2. For example, "one or more" means one or greater than or equal to two.

[0020] In the present application, “several” means at least one, such as one, two, etc., unless otherwise clearly defined.

[0021] In this application, "optionally", "optional" and "optional" refer to optional, that is, to any one of the two parallel schemes of "yes" or "no". If multiple "options" appear in a technical solution, unless otherwise specified and there is no contradiction or mutual restriction, each "optional" is independent.

[0022] In this application, in the "first aspect", "second aspect", "third aspect", "fourth aspect", etc., the terms "first", "second", "third", "fourth", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", "third", "fourth", etc. only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0023] In the present application, when referring to a numerical interval (i.e., a numerical range), unless otherwise specified, the optional numerical distribution within the above numerical interval is deemed to be continuous and includes the two numerical endpoints of the numerical range (i.e., the minimum value and the maximum value), and every numerical value between the two numerical endpoints.

[0024] The temperature parameters in this application, unless otherwise specified, are allowed to be either constant temperature treatment or to vary within a certain temperature range. It should be understood that the constant temperature treatment allows the temperature to fluctuate within the accuracy range controlled by the instrument. Fluctuations within the range of ±5°C, ±4°C, ±3°C, ±2°C, and ±1°C are allowed.

[0025] The atomizer core is a key component of the electronic cigarette atomizer. The atomizer core converts the smoke liquid into mist when heated. In addition, atomizers are used in many fields such as medical treatment, environmental protection engineering, chemical separation and catalytic reaction. In medical treatment, the atomizer core is mainly used in drug delivery systems, especially in the treatment of respiratory diseases. The atomizer core can atomize the drug into tiny particles, which can be absorbed by the respiratory tract, thereby improving the therapeutic efficiency of the drug. For example, in the treatment of asthma and other respiratory infections, the atomizer core can effectively deliver drugs to the patient's lungs, reduce drug waste, and reduce the required drug dosage. In environmental protection engineering, the atomizer core is mainly used in various spray systems to reduce pollutants in the air and water. For example, in urban spray dust reduction systems, the atomizer core can effectively reduce dust particles in the air and improve air quality. For another example, in sewage treatment facilities, the atomizer core can also be used to decompose and remove harmful chemicals in water. In chemical separation, the atomizer core is mainly used to separate liquid or solid mixtures into different components. For example, in the oil and gas industry, atomizers can be used to separate crude oil into different petroleum products. For example, in food processing, atomization technology can also be used to separate liquid food into solid and liquid components. In catalytic reactions, the atomizer core can improve the contact efficiency between the catalyst and the reactants, thereby accelerating the speed of the chemical reaction. For example, in the petrochemical industry, the atomizer can atomize heavy oil and mix it with the catalyst to improve the efficiency of the catalytic cracking reaction.

[0026] The atomizer core is usually a porous ceramic atomizer core. However, the porous ceramic atomizer core still has defects such as oil leakage, poor heat resistance, and easy deformation during use.

[0027] In view of the above problems, the first aspect of the present application provides a composite atomizer core. In one embodiment, see Figure 1 and Figure 2 The composite atomization core 100 includes a porous ceramic core material 11 and an inorganic fiber aerogel layer 12 coated on the outside of the porous ceramic core material 11 .

[0028] Among them, porous ceramic is a ceramic material with a large number of microporous structures, and inorganic fiber aerogel is a new type of nanoporous material. In this embodiment, the inorganic fiber aerogel layer 12 is coated on the outside of the porous ceramic core material 11, and the composite atomization core 100 has a super strong oil lock performance, which can effectively prevent the leakage of smoke oil and improve the atomization effect. At the same time, the holes of the porous ceramic core and the inorganic fiber aerogel are staggered, so that the atomization of the smoke oil is more layered and the taste is improved. The composite atomization core 100 has excellent high temperature stability and excellent chemical stability, is not easy to oxidize, corrode and stick the core, and can effectively improve the problems of poor heat resistance and poor chemical stability of traditional atomization cores. At the same time, the composite atomization core 100 has high mechanical strength and is not easy to deform. The composite atomization core 100 of this embodiment can be applied to multiple fields such as electronic cigarette atomizers, medical treatment, environmental protection engineering, chemical separation and catalytic reactions to meet the market's demand for high efficiency, safety and environmental protection.

[0029] In addition, compared with the atomizer core made of only inorganic fibers (such as silicate fibers and alumina fibers), the composite atomizer core has higher strength, which can reduce the risk of deformation or breakage of the atomizer core during use, affecting the atomization effect. In addition, the porosity and pore size distribution of the composite atomizer core are easier to control to control the oil absorption capacity and atomization effect of the atomizer core.

[0030] Optionally, the material of the porous ceramic core includes at least one of aluminum oxide, silicon dioxide, zirconium oxide, zirconium nitride, silicon carbide and silicon nitride.

[0031] Optionally, the porosity of the porous ceramic core material is 60% to 85%. For example, the porosity of the porous ceramic core material is 60%, 65%, 70%, 75%, or 80%.

[0032] Optionally, the pore size of the porous ceramic core material is 10 μm to 45 μm. For example, the pore size of the porous ceramic core material is 10 μm, 20 μm, 25 μm, 30 μm, 40 μm, or 45 μm.

[0033] Optionally, the porous ceramic core material is cylindrical, and the outer diameter is 0.01 mm to 5 mm, for example, the outer diameter is 0.01 mm, 0.1 mm, 0.5 mm, 1 mm, 3 mm, or 5 mm.

[0034] Optionally, the inorganic fiber of the inorganic fiber aerogel layer includes at least one of silicon carbide fiber, glass fiber, ceramic fiber, pre-oxidized fiber, silicate fiber and carbon fiber. Among them, the silicate fiber can be aluminum silicate fiber.

[0035] Optionally, the porosity of the inorganic fiber aerogel layer is 55% to 80%. For example, the porosity of the inorganic fiber aerogel layer is 55%, 60%, 65%, 70%, 75%, 80%. The inorganic fiber aerogel layer has the characteristics of low density, high specific surface area and high porosity.

[0036] Optionally, the pore size of the inorganic fiber aerogel layer is 0.1 μm to 15 μm. For example, the pore size of the inorganic fiber aerogel layer is 0.1 μm, 1 μm, 5 μm, 10 μm, or 15 μm.

[0037] Optionally, the thickness of the inorganic fiber aerogel layer is 0.03 mm to 1 mm. For example, the thickness of the inorganic fiber aerogel layer is 0.03 mm, 0.05 mm, 0.1 mm, 0.5 mm, or 1 mm. The thinner the inorganic aerogel layer is, the better the thickness of the composite atomizer core is. When the overall thickness of the composite atomizer core is thinner, the atomization performance of the mainstream ceramic atomizer core product can be achieved, which is beneficial to improving the portability and application range of the composite atomizer core.

[0038] To make the porous ceramic core material 11 and the inorganic fiber aerogel layer 12 fixedly connected. Optionally, the composite atomization core further includes a bonding layer 13, the bonding layer 13 is located between the porous ceramic core material 11 and the inorganic fiber aerogel layer 12, and is used to fix the porous ceramic core material 11 and the inorganic fiber aerogel layer 12.

[0039] Alternatively, the adhesive layer 13 may be formed by curing an adhesive, wherein the adhesive includes glass frit.

[0040] Optionally, the composite atomizer core further includes a heating element 14, which is located outside the inorganic fiber aerogel layer 12 and is used to heat the porous ceramic core material 11 and the inorganic fiber aerogel layer 12. In some examples, the heating element 14 can be formed by laminating a metal mesh or printing or sputtering a metal layer to the outside of the inorganic fiber aerogel layer 12. The heating element 14 heats the porous ceramic core material 11 and the inorganic fiber aerogel layer 12 to atomize the smoke liquid. Optionally, the outer diameter of the composite atomizer core 100 including the heating element is ≤2.5mm, and the portability is good.

[0041] The present application coats an inorganic fiber aerogel layer on a porous ceramic core material, and the resulting composite atomizer core has a super strong oil-locking performance, which can effectively avoid the leakage of tobacco oil and improve the atomization effect. At the same time, the holes of the porous ceramic core and the inorganic fiber aerogel are staggered, so that the atomization of the tobacco oil is more layered and the taste is improved. The composite atomizer core also has excellent high-temperature stability and excellent chemical stability, is not easy to oxidize, corrode and stick to the core, and can effectively improve the problems of poor heat resistance and poor chemical stability of traditional atomizer cores. At the same time, the composite atomizer core has high mechanical strength and is not easy to deform. The composite atomizer core of the present application can be used in multiple fields such as electronic cigarette atomizers, medical treatment, environmental protection engineering, chemical separation and catalytic reactions to meet the market's demand for high efficiency, safety and environmental protection.

[0042] The second aspect of the present application provides a method for preparing a composite atomizer core, and its technical solution is as follows:

[0043] A method for preparing a composite atomizer core comprises the following steps:

[0044] S10, obtaining a porous ceramic core material.

[0045] In some examples, a porous ceramic core material is prepared, and the method for preparing the porous ceramic core material includes the following steps:

[0046] Ceramic material, pore-forming material and bonding material are mixed to obtain ceramic slurry, which is coated on a template, hot-pressed and then sintered, and the template is removed to obtain a hollow porous ceramic core material.

[0047] Optionally, the ceramic material includes one or more of aluminum oxide, silicon dioxide, zirconium oxide, zirconium nitride, silicon carbide and silicon nitride.

[0048] Optionally, the pore-forming material is selected from one or more of polymethyl methacrylate, starch, carbon powder, carbonate, nitrate, ammonium salt, sawdust, sucrose and carbon fiber, wherein the carbon fiber can be short carbon fiber.

[0049] Optionally, the bonding material is selected from one or more of glass powder, polyvinyl alcohol, polyethylene glycol, polystyrene, polyethylene and polypropylene. Among them, the polyethylene glycol can be polyethylene glycol 4000.

[0050] It is understood that the template can be an inorganic or organic hard cylinder, and the template can be removed by sintering or dissolving with a solvent.

[0051] The preparation parameters of the porous ceramic core material are controlled to control the porosity of the porous ceramic core material to be 60% to 85% and the pore size to be 10 μm to 45 μm. By controlling the porosity and pore size of the porous ceramic core material, the oil absorption capacity and atomization effect of the composite atomization core can be adjusted, and the flexibility and adaptability of the composite atomization core can be improved. In addition, the shape of the porous ceramic core material can be controlled to be a cylinder with an outer diameter of 0.01 mm to 5 mm.

[0052] In addition to the above methods, porous ceramic core materials can be prepared by direct foaming or gel casting. Among them, the direct foaming method uses Ca(OH)2, CaO and other substances that decompose and produce gas at high temperature as foaming agents to prepare porous ceramics. The gel casting method is to achieve in-situ solidification molding by polymerizing organic monomers added to the ceramic slurry under reaction conditions such as catalysts and temperature.

[0053] S20, obtaining an inorganic fiber aerogel layer.

[0054] Optionally, the inorganic fiber includes at least one of silicon carbide fiber, glass fiber, ceramic fiber, pre-oxidized fiber, silicate fiber and carbon fiber. Among them, the silicate fiber can be aluminum silicate fiber.

[0055] In some examples, the inorganic fiber includes silicon carbide fiber, and the inorganic fiber aerogel layer is prepared. The method for preparing the inorganic fiber aerogel layer includes the following steps:

[0056] 1) Using siloxane as a raw material, anhydrous ethanol as a solvent, and water as a cross-linking agent to prepare a polysiloxane sol; 2) Using short-cut carbon fibers as the basic unit constituting a template skeleton, the short-cut carbon fibers are uniformly dispersed in the polysiloxane sol by mechanical stirring, ultrasonic treatment, or ball milling, so that the surface of the short-cut carbon fibers is covered with polysiloxane sol; 3) Residual polysiloxane sol is removed to form a three-dimensional porous carbon fiber skeleton bonded by the polysiloxane sol; 4) The three-dimensional porous carbon fiber skeleton is heated to the curing temperature of the polysiloxane sol, and the heat is maintained until a polysiloxane gel / porous carbon fiber skeleton is formed; 5) In an argon atmosphere, the polysiloxane gel / porous carbon fiber skeleton is heated to 1200°C~1700°C, and the heat is maintained for a certain period of time to obtain a silicon carbide nanowire / carbon fiber composite structure; 6) The silicon carbide nanowire / carbon fiber composite structure is heated to 400°C~1000°C in air, and the heat is maintained for a certain period of time to obtain a silicon carbide aerogel layer.

[0057] Optionally, in order to improve the strength of the inorganic fiber aerogel layer, the bonding force between the inorganic fibers can be enhanced by heat treatment or chemical treatment. For example, the inorganic fiber aerogel layer is sintered at 900°C to 1100°C for 1h to 3h or chemical vapor deposition (CVD) is used to react silane at the gas-solid interface to generate a solid deposit.

[0058] Control the preparation parameters of the inorganic fiber aerogel layer, for example, control the diameter and density of the inorganic fiber. The porosity of the inorganic fiber aerogel layer is controlled to be 55%~95%, and the pore size is 0.1μm~20μm. By controlling the porosity and pore size of the inorganic fiber aerogel layer, the oil absorption capacity and atomization effect of the composite atomization core can be adjusted, and the flexibility and adaptability of the composite atomization core can be improved. In addition, by controlling the preparation parameters of the inorganic fiber aerogel layer, the thickness of the inorganic fiber aerogel layer can also be controlled to be 0.03mm~1mm.

[0059] In addition to the above methods, the inorganic fiber aerogel layer can also be prepared by solid phase method or electrospinning method. Among them, the solid phase method is to fully mix metals or metal oxides in a certain proportion, grind them and calcine them, and directly obtain ultrafine powders through solid phase reaction, or crush them again to obtain ultrafine powders, and use ultrafine powders to form gel. The electrospinning method is to spray the solution into fibers through high voltage and gel them in the air.

[0060] S30, coating the inorganic fiber aerogel layer on the porous ceramic core material.

[0061] Optionally, the method of coating the inorganic fiber aerogel layer on the porous ceramic core material comprises the following steps: applying a binder on the surface of the porous ceramic core material and / or the inorganic fiber aerogel layer, bonding in position, coating the inorganic fiber aerogel layer on the outside of the porous ceramic core material, and forming a bonding layer between the porous ceramic core material and the inorganic fiber aerogel layer. At this time, the bonding improves the bonding strength between the inorganic fiber aerogel layer and the porous ceramic core material.

[0062] Optionally, the binder includes glass frit.

[0063] By wrapping the inorganic fiber aerogel layer on the outside of the porous ceramic core material through the above method, the composite atomization core can have high strength and high stability, and the composite method is fast and efficient.

[0064] Optionally, the method further includes the following steps: forming a heating element outside the inorganic fiber aerogel layer. For example, the heating element is formed by laminating a metal mesh or printing or sputtering a metal layer outside the inorganic fiber aerogel layer. The heating element is used to heat the porous ceramic core material and the inorganic fiber aerogel layer to atomize the cigarette oil liquid.

[0065] The preparation method of the composite atomizer core has a mature production line, a simple preparation process, and low cost, which is conducive to large-scale production and meets the market demand for high efficiency, safety, and environmental protection.

[0066] The following is further described in conjunction with specific embodiments and comparative examples. The raw materials involved in the following specific embodiments and comparative examples, unless otherwise specified, can all be commercially available, the instruments used, unless otherwise specified, can all be commercially available, and the processes involved, unless otherwise specified, are all routinely selected by those skilled in the art.

[0067] Example 1

[0068] This embodiment provides a composite atomizer core and a preparation method thereof, and the steps are as follows:

[0069] Step 1: Obtain a hollow porous ceramic core material, wherein the porous ceramic core material is a cylinder with an outer diameter of 3 mm, a porosity of 75%, and a pore size of 10 μm to 45 μm.

[0070] Step 2: Preparation of inorganic fiber aerogel layer

[0071] Polysiloxane sol is prepared with siloxane as raw material, anhydrous ethanol as solvent and water as cross-linking agent, short-cut carbon fiber is added to the polysiloxane sol, and the short-cut carbon fiber is dispersed in the polysiloxane sol by mechanical stirring, so that the surface of the short-cut carbon fiber is covered with polysiloxane sol, and then heated, cured and heat-insulated to obtain a silicon carbide aerogel layer with a porosity of 70%, a pore size of 0.1μm~15μm and a thickness of 0.5mm.

[0072] Step 3: Wrapping the inorganic fiber aerogel layer on the porous ceramic core material

[0073] The inorganic fiber aerogel layer is coated on the porous ceramic core material, a proper amount of glass powder is added between the contact surfaces of the inorganic fiber aerogel layer and the porous ceramic core material, and the inorganic fiber aerogel layer and the porous ceramic core material are bonded together by low-temperature sintering.

[0074] Step 4: forming a heating element on the inorganic fiber aerogel layer.

[0075] The heating material is printed on the surface of the inorganic fiber aerogel layer away from the porous ceramic core material, and the composite atomization core is obtained through high-temperature sintering.

[0076] Comparative Example 1

[0077] This comparative example provides an atomizer core and a preparation method thereof, which is basically the same as Example 1, except that the inorganic fiber gel layer is not coated on the porous ceramic core material. The steps are as follows:

[0078] Step 1: Obtain the same hollow porous ceramic core material as in Example 1, wherein the porous ceramic core material is a cylinder with an outer diameter of 3 mm, a porosity of 75%, and a pore size of 10 μm to 45 μm.

[0079] Step 2: forming a heating element on the porous ceramic core material.

[0080] The heating material is printed on the surface of the porous ceramic core material, and then sintered at high temperature to obtain a ceramic atomization core.

[0081] The performance of the atomizer cores of the above embodiments and comparative examples was tested according to the following method:

[0082] High temperature and high humidity stability test: Load the atomizer core into the cartridge and add e-liquid, put it in a constant temperature and humidity chamber, place three cartridges upright, upside down, and flat, set the temperature to 55℃, the humidity to 90%, leave it for 24 hours, let it stand at room temperature for 2 hours to check the sample, and observe whether the product has any leakage. If there is leakage when placed upright, upside down or flat, take another sample and repeat the above test, set the temperature to 55℃, the humidity to 90%, leave it for 5 hours, let it stand at room temperature for 2 hours to check the sample, and observe whether the product has any leakage.

[0083] Taste test: Put the atomizer core into the cartridge, add e-liquid, and inhale it artificially.

[0084] Strength test: The strength of the atomizer core is tested using the national standard "GB / T 4740-1999".

[0085] Table 1

[0086]

[0087] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A composite atomizer core, characterized in that: The invention comprises a porous ceramic core material and an inorganic fiber aerogel layer coated on the outer side of the porous ceramic core material.

2. The composite atomizer core according to claim 1, characterized in that: The inorganic fiber of the inorganic fiber aerogel layer includes at least one of silicon carbide fiber, glass fiber, ceramic fiber, pre-oxidized fiber, silicate fiber and carbon fiber.

3. The composite atomizer core according to claim 2, characterized in that: The inorganic fiber aerogel layer comprises at least one of the following features: (1) The porosity of the inorganic fiber aerogel layer is 55% to 95%; (2) The pore size of the inorganic fiber aerogel layer is 0.1 μm to 20 μm; (3) The thickness of the inorganic fiber aerogel layer is 0.03 mm to 1 mm.

4. The composite atomizer core according to claim 1, characterized in that: The material of the porous ceramic core material includes at least one of aluminum oxide, silicon dioxide, zirconium oxide, zirconium nitride, silicon carbide and silicon nitride.

5. The composite atomizer core according to claim 4, characterized in that: The porous ceramic core material comprises at least one of the following features: (1) The porosity of the porous ceramic core material is 60% to 85%; (2) The pore size of the porous ceramic core material is 10 μm to 45 μm; (3) The porous ceramic core material is cylindrical with an outer diameter of 0.01 mm to 5 mm.

6. The composite atomizer core according to any one of claims 1 to 5, characterized in that: The invention also comprises a bonding layer, wherein the bonding layer is located between the porous ceramic core material and the inorganic fiber aerogel layer.

7. The composite atomizer core according to any one of claims 1 to 5, characterized in that: It also includes a heating body, which is located outside the inorganic fiber aerogel layer.

8. A method for preparing a composite atomizer core, characterized in that: The method comprises the following steps: coating the inorganic fiber aerogel layer on the outside of the porous ceramic core material.

9. The method for preparing the composite atomizer core according to claim 8, characterized in that: The method for coating the inorganic fiber aerogel layer on the porous ceramic core material comprises the following steps: applying an adhesive on the surface of the porous ceramic core material and / or the inorganic fiber aerogel layer, bonding them in position, coating the inorganic fiber aerogel layer on the porous ceramic core material, and forming a bonding layer between the porous ceramic core material and the inorganic fiber aerogel layer.

10. The method for preparing the composite atomizer core according to claim 9, characterized in that: The following steps are also included: A heating layer is formed outside the porous ceramic core material.

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