WO2024000915A1 - Porous ceramic atomizing core and preparation method therefor, and aerosol generating device - Google Patents

Abstract

Embodiments of the present application disclose a porous ceramic atomizing core and a preparation method therefor, and an aerosol generating device. The method comprises: mixing and grinding ceramic powder, a sintering aid, and a pore forming agent to obtain ceramic composite powder, wherein the ceramic powder comprises wollastonite, diatomite, and glass powder; carrying out internal mixing on the ceramic composite powder and a binder to obtain a ceramic material block; granulating the ceramic material block to obtain ceramic particles; inlaying and injection molding the ceramic particles and a metal felt to obtain a ceramic body having a heating film; and sintering the ceramic body to obtain a porous ceramic atomizing core. The present application has the advantages of low sintering temperature, small shrinkage, high strength, high porosity, and uniform pore diameter.

Description

Porous ceramic atomizing core and its preparation method and aerosol generating device Technical field

The present application relates to an aerosol generating device, and more specifically to a porous ceramic atomizing core and its preparation method and aerosol generating device.

Background technique

At present, the heating film of the common ceramic atomizing core is prepared through a thick film printing process. The thick film printing process can only be performed on a flat surface. However, the resistance of the heating film is affected by factors such as electronic paste and sintering temperature, and the fluctuation range is relatively large. , which will affect the product yield and the atomization effect of the aerosol-generating matrix. In addition, common porous ceramics are prepared by high-temperature sintering, which consumes a lot of energy and has a large shrinkage rate. The product size is difficult to control and the yield rate is low, resulting in Increased costs.

Contents of the invention

The purpose of this application is to overcome the shortcomings of the existing technology and provide a porous ceramic atomizing core, its preparation method and an aerosol generating device, which have the advantages of low sintering temperature, small shrinkage, high strength, high porosity and uniform pore size.

In order to achieve the above purpose, this application adopts the following technical solutions:

The above description is only an overview of the technical solutions of the present application. In order to have a clearer understanding of the technical solutions of the present application, they can be implemented in accordance with the contents of the description. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following A preferred embodiment is specifically cited to describe the first aspect, the preparation method of the porous ceramic atomizing core, including the following steps:

Mixing and grinding ceramic powder, sintering aid and pore-forming agent to obtain ceramic composite powder, wherein the ceramic powder includes wollastonite, diatomite and glass powder;

The ceramic composite powder and the binder are subjected to an internal mixing process to obtain a ceramic block;

Granulating the ceramic material blocks to obtain ceramic particles;

The ceramic particles and metal felt are inlaid and injection molded to obtain a ceramic body with a heating film;

The ceramic body is sintered to obtain a porous ceramic atomizing core.

The further technical solution is: the conditions for the mixture grinding treatment are: adding zirconia balls and grinding for 1-3 hours.

The further technical solution is to carry out the internal mixing process of the ceramic composite powder and the binder to obtain the ceramic block, which includes the following processing steps:

Stir the binder for half an hour until it is completely melted;

Add the ceramic composite powder to the completely melted binder in multiple batches, stir for 6-8 hours and then collect for later use.

A further technical solution is that the binder is two or more of paraffin, beeswax, polyethylene and stearic acid.

A further technical solution is that the ceramic particles are uniform particles of 2-3 microns.

The further technical solution is: the conditions for the sintering treatment are: heating to 80°C at a heating rate of 60-100°C/h, holding for 0.5-1h, and then heating to 130°C at a heating rate of 30-60°C/h. Keep it warm for 1-3h, then raise it to 240°C at a heating rate of 10-50°C/h, keep it warm for 2-4h, then raise it to 310°C at a heating rate of 10-30°C/h, keep it warm for 1-2 hours, and then keep it warm for 1-2 hours. Raise the temperature to 390℃ at a heating rate of 10-30℃/h, keep it warm for 1-2h, and then raise it to 500℃ at a heating rate of 30-50℃/h, keep it warm for 1-2h, and then heat it up at a temperature of 60-100℃/h. Raise the temperature to 600-800℃ at a high heating rate, keep it warm for 1-2h, and finally cool to room temperature.

The further technical solution is to mix and grind ceramic powder, sintering aid and pore-forming agent to obtain ceramic composite powder, wherein the ceramic powder includes wollastonite, diatomite and glass. In the step of adding powder, in terms of mass percentage, the wollastonite is 5%-20%, the diatomite is 10%-40%, the glass powder is 10%-25%, and the sintering aid The content of the pore-forming agent is 3%-15%, and the pore-forming agent is 10%-30%.

The further technical solution is to mix and grind ceramic powder, sintering aid and pore-forming agent to obtain ceramic composite powder, wherein the ceramic powder includes wollastonite, diatomite and glass. In the step of powdering, the particle size of the wollastonite is one or more of 325 mesh, 600 mesh, and 900 mesh, and the particle size of the diatomite is one of 200 mesh, 500 mesh, and 700 mesh. One or two types, the particle size of the glass powder is one or two of 325 mesh and 600 mesh, the sintering aid is kaolin, white clay, titanium oxide, cordierite, potassium feldspar, perlite, One or more bauxite, and the pore-forming agent is one or two of starch, polystyrene microspheres, and polymethylmethacrylate.

In the second aspect, a porous ceramic atomizing core is prepared using the above preparation method.

In a third aspect, an aerosol generating device includes a main machine and the above-mentioned porous ceramic atomizing core; the porous ceramic atomizing core is installed on the main machine.

The beneficial effects of this application compared with the existing technology are: this application uses metal felt as the heating film of the atomization core. The resistance of the metal felt is controllable, and the sintering shrinkage of the metal felt is small, thereby improving the atomization effect and yield rate. , In addition, wollastonite and diatomite are used as base materials. Since wollastonite has good thermal expansion, the drying shrinkage and firing shrinkage of the ceramic material are very small. Glass powder, titanium oxide, boron nitride, Kaolin, feldspar, cordierite, etc. are used as sintering aids, which can increase strength and reduce sintering temperature. Polymethyl methacrylate, polystyrene microspheres, starch, etc. are used as pore-forming agents. The selected pore-forming agents The agent particles are uniform and the porosity and pore size can be well controlled. Detailed description is as follows.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, which are of great significance to this field. Ordinary technicians can also obtain other drawings based on these drawings without exerting creative work.

Figure 1 is an experimental data table of the embodiment of the present application.

Detailed ways

The technical solution of the present application will be clearly and completely described below with reference to specific embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

It should be understood that, when used in this specification and claims, the terms "comprising" and "comprising" indicate the presence of described features, integers, steps, operations, elements and/or components but do not exclude the presence of one or more The presence or addition of other features, integers, steps, operations, elements, components and/or collections thereof.

It should also be understood that the terminology used in the specification of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly dictates otherwise.

It will be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items. .

The embodiment of the present application discloses a method for preparing a porous ceramic atomizing core, which includes the following steps: step 1 to step 4.

Step 1: Mix and grind ceramic powder, sintering aid and pore-forming agent to obtain ceramic composite powder, where the ceramic powder includes wollastonite, diatomite and glass powder.

Put wollastonite, diatomaceous earth, glass powder sintering aid and pore-forming agent into a ball mill in a proportion, add zirconia balls with a mass ratio of 1:2, and collect after ball milling for 1-3 hours for later use.

By using wollastonite and diatomite as base materials, wollastonite has good thermal expansion, which makes the drying shrinkage and firing shrinkage of the ceramic material very small, thus making the ceramic atomizer core produced with a small shrinkage rate. .

In one embodiment, in step 1, in terms of mass percentage, wollastonite is 5%-20%, diatomite is 10%-40%, glass powder is 10%-25%, and sintering aid is 3% -15%, pore-forming agent is 10%-30%.

In one embodiment, in step 1, the particle size of wollastonite is one or more of 325 mesh, 600 mesh, and 900 mesh, and the particle size of diatomite is 200 mesh, 500 mesh, or 700 mesh. One or two types, the particle size of the glass powder is one or two of 325 mesh and 600 mesh, and the sintering aid is kaolin, white clay, titanium oxide, cordierite, potassium feldspar, perlite, bauxite One or more of them, the pore-forming agent is one or two of starch, polystyrene microspheres, and polymethylmethacrylate.

Using glass powder, titanium oxide, boron nitride, kaolin, feldspar, cordierite, etc. as sintering aids can increase strength and reduce sintering temperature.

Polymethyl methacrylate, polystyrene microspheres, starch, etc. are used as pore-forming agents. The selected pore-forming agent particles are uniform and can well control the porosity and pore size.

Step 2: Mix the ceramic composite powder and the binder to obtain a ceramic block.

In one embodiment, step 2 specifically includes the following sub-steps: step 21 and step 22.

Step 21: Stir the adhesive for half an hour until it is completely melted.

Step 22: Add the ceramic composite powder into the completely melted binder in multiple batches, stir for 6-8 hours, and collect for later use.

For steps 21 and 22, weigh the adhesive in a certain proportion and put it into the internal mixer, set the appropriate temperature and rotation speed, and stir for half an hour until it is completely melted and turned into a clear liquid. Add the mixed ceramic composite powder to the internal mixer in multiple batches, stir for 6-8 hours and then collect it for later use to obtain a stable ceramic mass.

In one embodiment, the binder is two or more of paraffin, beeswax, polyethylene, and stearic acid.

In one embodiment, the binder is composed of 30%-70% paraffin, 15%-40% beeswax, 0-7% polyethylene, and 0-10% stearic acid in terms of mass percentage.

Step 3: Granulate the ceramic blocks. Preferably, the ceramic particles are uniform particles of 2-3 microns.

Step 4: The ceramic particles and metal felt are inlaid and injection molded to obtain a ceramic body with a heating film.

Put the granulated material into the barrel of the injection molding machine, put the metal felt into the mold, and obtain a regular-shaped ceramic body with a heating film through the inlay process and injection molding process. Since metal felt is used as the heating film of the atomizing core, the resistance of the metal felt is controllable, and the sintering shrinkage of the metal felt is small, thus improving the atomization effect and yield rate.

Step 5: Sintering the ceramic body to obtain a porous ceramic atomizing core.

The ceramic body is placed in a sintering furnace and cooled to obtain a porous ceramic atomizing core.

The conditions for sintering treatment are: heating to 80℃ at a heating rate of 60-100℃/h, holding for 0.5-1h, then heating to 130℃ at a heating rate of 30-60℃/h, holding for 1-3h, and then holding for 10 Heating to 240℃ at a heating rate of -50℃/h, holding for 2-4h, then heating to 310℃ at a heating rate of 10-30℃/h, holding for 1-2h, and then heating at a heating rate of 10-30℃/h The temperature is increased to 390℃, maintained for 1-2h, then heated to 500℃ at a heating rate of 30-50℃/h, kept for 1-2h, and then heated to 600-800℃ at a heating rate of 60-100℃/h. ℃, keep warm for 1-2h, and finally cool to room temperature.

The embodiment of the present application also discloses a porous ceramic atomizing core produced by the above preparation method. The porous ceramic atomizing core has the advantages of low sintering temperature, small shrinkage, high strength, high porosity and uniform pore size.

The embodiment of the present application also discloses an aerosol generating device, which includes a host machine and the above-mentioned porous ceramic atomizing core. The porous ceramic atomizing core is installed on the host machine, and the host machine provides power and atomization control for the atomizing core.

In order to enable those skilled in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be described more clearly and completely below in conjunction with the accompanying drawings.

Example 1

The preparation method of porous ceramic atomizing core includes the following steps:

(1) Calculate based on mass percentage, weigh 15% of 325 mesh wollastonite, weigh 30% of 500 mesh diatomite, weigh 15% of glass powder, weigh 3% of kaolin, weigh 1% of For titanium oxide, weigh 3% cordierite, weigh 3% perlite, weigh 30% polystyrene microspheres, put them into a ball mill, add zirconia balls with a mass ratio of 1:2, and ball mill for 3 hours. Collect for later use.

(2) Calculate based on mass percentage, weigh 70% of the paraffin wax, weigh 30% of the beeswax, put it into the internal mixer, set the temperature to 90°C, and the rotation speed to 100r/min. After half an hour, the binder has completely melted. At this time, add the weighed ceramic powder, continue to mix for 8 hours, and then collect it for later use.

(3) Put the internally mixed ceramic blocks into the granulator for granulation, and then collect them for later use.

(4) Put the granulated material into the barrel of the injection molding machine, put the metal felt into the mold, and combine the inlay process with injection molding to prepare a ceramic green body.

(5) Put the ceramic body into the sintering furnace, raise the temperature to 80°C at 60°C/h, keep it warm for 1 hour, raise the temperature to 130°C at 30°C/h, keep it warm for 3 hours, raise the temperature to 240°C at 25°C/h, and keep it warm. 4h, heat up to 310℃ at 20℃/h, hold for 2h, heat up to 390℃ at 10℃/h, hold for 1h, heat up to 500℃ at 30℃/h, hold for 2h, heat up to 720℃ at 60℃/h , keep warm for 2h, and cool to room temperature. That is, the prepared porous ceramic atomizing core is obtained.

Example 2

The preparation method of porous ceramic atomizing core includes the following steps:

(1) Calculate based on mass percentage, weigh 5% of 325 mesh wollastonite, weigh 10% of 600 mesh wollastonite, weigh 30% of 200 mesh diatomite, weigh 20% of glass powder, weigh Weigh 2% kaolin, 1% titanium oxide, 3% cordierite, 30% polystyrene microspheres, put them into a ball mill, and add zirconia balls with a mass ratio of 1:2. After ball milling for 3 hours, collect and set aside.

(2) Calculate based on mass percentage, weigh 50% paraffin, weigh 35% beeswax, weigh 6% polyethylene, weigh 9% polyethylene, put it into the internal mixer, and set the temperature to 120 ℃, the rotation speed is 150r/min, and after half an hour, the binder has completely melted. Set the temperature to 90°C and the rotation speed to 100r/min. When the temperature reaches the set temperature, add the weighed ceramic powder and continue mixing for 8 hours, then collect it for later use.

(3) Put the internally mixed ceramic blocks into the granulator for granulation, and then collect them for later use.

(4) Put the granulated material into the barrel of the injection molding machine, put the metal felt into the mold, and combine the inlay process with injection molding to prepare a ceramic green body.

(5) Put the ceramic body into the sintering furnace, raise the temperature to 80°C at 80°C/h, keep it warm for 1 hour, raise the temperature to 130°C at 40°C/h, keep it warm for 3 hours, raise the temperature to 240°C at 30°C/h, and keep it warm 4h, heat up to 310℃ at 20℃/h, hold for 2h, heat up to 390℃ at 13℃/h, hold for 1h, heat up to 500℃ at 30℃/h, hold for 2h, heat up to 670℃ at 60℃/h , keep warm for 2h, and cool to room temperature. That is, the prepared porous ceramic atomizing core is obtained.

Example 3

The preparation method of porous ceramic atomizing core includes the following steps:

(1) Calculate based on mass percentage, weigh 15% of 325 mesh wollastonite, weigh 5% of 600 mesh wollastonite, weigh 15% of 200 mesh diatomaceous earth, weigh 10% of 500 mesh diatomaceous earth Soil, weigh 17% glass powder, weigh 5% kaolin, weigh 1% titanium oxide, weigh 2% white clay, weigh 4% cordierite, weigh 26% polystyrene micro Put the balls into the ball mill, add zirconia balls with a mass ratio of 1:2, and collect them after ball milling for 3 hours.

(2) Calculate based on mass percentage, weigh 50% paraffin, weigh 35% beeswax, weigh 6% polyethylene, weigh 9% polyethylene, put it into the internal mixer, and set the temperature to 120 ℃, the rotation speed is 150r/min, and after half an hour, the binder has completely melted. Set the temperature to 90°C and the rotation speed to 100r/min. When the temperature reaches the set temperature, add the weighed ceramic powder and continue mixing for 8 hours, then collect it for later use.

(3) Put the internally mixed ceramic blocks into the granulator for granulation, and then collect them for later use.

(4) Put the granulated material into the barrel of the injection molding machine, put the metal felt into the mold, and combine the inlay process with injection molding to prepare a ceramic green body.

(5) Put the ceramic body into the sintering furnace, raise the temperature to 80°C at 70°C/h, keep it warm for 1 hour, raise the temperature to 130°C at 30°C/h, keep it warm for 3 hours, raise the temperature to 240°C at 10°C/h, and keep it warm. 4h, heat up to 310℃ at 20℃/h, hold for 2h, heat up to 390℃ at 15℃/h, hold for 1h, heat up to 500℃ at 30℃/h, hold for 2h, heat up to 750℃ at 60℃/h , keep warm for 2h, and cool to room temperature. That is, the prepared porous ceramic atomizing core is obtained.

Please refer to Figure 1. From the experimental data of the three examples given in the table of Figure 1, it can be seen that while the sintering temperature is kept low, the prepared porous ceramic atomizing core can still be guaranteed to have low shrinkage and high strength. It has the characteristics of high porosity and uniform pore size.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of various equivalent methods within the technical scope disclosed in the present application. Modification or replacement, these modifications or replacements shall be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims (20)

1. A method for preparing a porous ceramic atomizing core, which includes the following steps:

   Mixing and grinding ceramic powder, sintering aid and pore-forming agent to obtain ceramic composite powder, wherein the ceramic powder includes wollastonite, diatomite and glass powder;

   The ceramic composite powder and the binder are subjected to an internal mixing process to obtain a ceramic block;

   Granulating the ceramic material blocks to obtain ceramic particles;

   The ceramic particles and metal felt are inlaid and injection molded to obtain a ceramic body with a heating film;

   The ceramic body is sintered to obtain a porous ceramic atomizing core.
2. The method for preparing a porous ceramic atomizing core according to claim 1, wherein the conditions for the mixing and grinding treatment are: adding zirconia balls and grinding for 1-3 hours.
3. The method for preparing a porous ceramic atomizing core according to claim 1, wherein the internal mixing process of the ceramic composite powder and the binder to obtain the ceramic block includes the following processing steps:

   Stir the binder for half an hour until it is completely melted;

   Add the ceramic composite powder to the completely melted binder in multiple batches, stir for 6-8 hours and then collect for later use.
4. The method for preparing a porous ceramic atomizing core according to claim 3, wherein the binder is two or more of paraffin, beeswax, polyethylene, and stearic acid.
5. The method for preparing a porous ceramic atomizing core according to claim 1, wherein the ceramic particles are uniform particles of 2-3 microns.
6. The method for preparing a porous ceramic atomizing core according to claim 1, wherein the sintering treatment conditions are: heating to 80°C at a heating rate of 60-100°C/h, maintaining the temperature for 0.5-1h, and then proceeding to 30-100°C. Heating to 130℃ at a heating rate of 60℃/h, holding for 1-3h, then heating to 240℃ at a heating rate of 10-50℃/h, holding for 2-4h, and then heating at a heating rate of 10-30℃/h to 310℃, keep for 1-2h, then raise the temperature to 390℃ at a heating rate of 10-30℃/h, keep for 1-2h, then raise the temperature to 500℃ at a heating rate of 30-50℃/h, and keep for 1 -2h, then raise the temperature to 600-800℃ at a heating rate of 60-100℃/h, keep it warm for 1-2h, and finally cool to room temperature.
7. The method for preparing a porous ceramic atomizing core according to claim 1, wherein the ceramic powder, sintering aid and pore-forming agent are mixed and ground to obtain ceramic composite powder, wherein the ceramic In the step where the powder includes wollastonite, diatomite and glass powder, in terms of mass percentage, the wollastonite is 5%-20%, the diatomite is 10%-40%, and the glass powder is The content of the burning aid is 10%-25%, the burning aid is 3%-15%, and the pore-forming agent is 10%-30%.
8. The method for preparing a porous ceramic atomizing core according to claim 1, wherein the ceramic powder, sintering aid and pore-forming agent are mixed and ground to obtain ceramic composite powder, wherein the ceramic In the step where the powder includes wollastonite, diatomite and glass powder, the particle size of the wollastonite is one or more of 325 mesh, 600 mesh, and 900 mesh, and the particle size of the diatomite is It is one or both of 200 mesh, 500 mesh, and 700 mesh. The particle size of the glass powder is one or two of 325 mesh and 600 mesh. The sintering aid is kaolin, white clay, oxidized clay, etc. One or more of titanium, cordierite, potassium feldspar, perlite, and bauxite, and the pore-forming agent is one or two of starch, polystyrene microspheres, and polymethyl methacrylate. .
9. A porous ceramic atomizing core, wherein the preparation method of the porous ceramic atomizing core includes the following steps:

   Mixing and grinding ceramic powder, sintering aid and pore-forming agent to obtain ceramic composite powder, wherein the ceramic powder includes wollastonite, diatomite and glass powder;

   The ceramic composite powder and the binder are subjected to an internal mixing process to obtain a ceramic block;

   Granulating the ceramic material blocks to obtain ceramic particles;

   The ceramic particles and metal felt are inlaid and injection molded to obtain a ceramic body with a heating film;

   The ceramic body is sintered to obtain a porous ceramic atomizing core.
10. The porous ceramic atomization core according to claim 9, wherein the conditions for the mixing and grinding treatment are: adding zirconia balls and grinding for 1-3 hours.
11. The porous ceramic atomizing core according to claim 9, wherein the internal mixing process of the ceramic composite powder and the binder to obtain the ceramic block includes the following processing steps:

    Stir the binder for half an hour until it is completely melted;

    Add the ceramic composite powder to the completely melted binder in multiple batches, stir for 6-8 hours and then collect for later use.
12. The porous ceramic atomization core according to claim 11, wherein the binder is two or more of paraffin, beeswax, polyethylene, and stearic acid.
13. The porous ceramic atomization core according to claim 9, wherein the ceramic particles are uniform particles of 2-3 microns.
14. The porous ceramic atomization core according to claim 9, wherein the sintering treatment conditions are: heating to 80°C at a heating rate of 60-100°C/h, maintaining the temperature for 0.5-1h, and then heating to 30-60°C/h. The temperature is raised to 130℃ at a heating rate of h, maintained for 1-3h, then heated to 240℃ at a heating rate of 10-50℃/h, kept for 2-4h, and then heated to 310℃ at a heating rate of 10-30℃/h. , keep warm for 1-2h, then raise the temperature to 390℃ at a heating rate of 10-30℃/h, keep warm for 1-2h, then raise the temperature to 500℃ at a heating rate of 30-50℃/h, and keep warm for 1-2h. Then raise the temperature to 600-800°C at a heating rate of 60-100°C/h, keep it warm for 1-2 hours, and finally cool to room temperature.
15. The porous ceramic atomizing core according to claim 9, wherein the ceramic powder, sintering aid and pore-forming agent are mixed and ground to obtain ceramic composite powder, wherein the ceramic powder includes In the steps of wollastonite, diatomite and glass powder, in terms of mass percentage, the wollastonite is 5%-20%, the diatomite is 10%-40%, and the glass powder is 10% -25%, the burning aid is 3%-15%, and the pore-forming agent is 10%-30%.
16. The porous ceramic atomizing core according to claim 9, wherein the ceramic powder, sintering aid and pore-forming agent are mixed and ground to obtain ceramic composite powder, wherein the ceramic powder includes In the steps of wollastonite, diatomite and glass powder, the particle size of the wollastonite is one or more of 325 mesh, 600 mesh, and 900 mesh, and the particle size of the diatomite is 200 mesh. , one or both of 500 mesh and 700 mesh, the particle size of the glass powder is one or both of 325 mesh and 600 mesh, the sintering aid is kaolin, white clay, titanium oxide, cordyle One or more of bluestone, potassium feldspar, perlite, and bauxite, and the pore-forming agent is one or two of starch, polystyrene microspheres, and polymethylmethacrylate.
17. An aerosol generating device, which includes a host and a porous ceramic atomizing core; the porous ceramic atomizing core is installed on the host; the preparation method of the porous ceramic atomizing core includes the following steps:

    Mixing and grinding ceramic powder, sintering aid and pore-forming agent to obtain ceramic composite powder, wherein the ceramic powder includes wollastonite, diatomite and glass powder;

    The ceramic composite powder and the binder are subjected to an internal mixing process to obtain a ceramic block;

    Granulating the ceramic material blocks to obtain ceramic particles;

    The ceramic particles and metal felt are inlaid and injection molded to obtain a ceramic body with a heating film;

    The ceramic body is sintered to obtain a porous ceramic atomizing core.
18. The aerosol generating device according to claim 17, wherein the conditions for the mixing and grinding treatment are: adding zirconia balls and grinding for 1-3 hours.
19. The aerosol generating device according to claim 17, wherein the internal mixing process of the ceramic composite powder and the binder to obtain the ceramic block includes the following processing steps:

    Stir the binder for half an hour until it is completely melted;

    Add the ceramic composite powder to the completely melted binder in multiple batches, stir for 6-8 hours and then collect for later use.
20. The aerosol generating device according to claim 19, wherein the binder is two or more of paraffin, beeswax, polyethylene, and stearic acid.

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