WO2023065702A1

WO2023065702A1 - Porous ceramic atomizing core and preparation method therefor, and electronic cigarette

Info

Publication number: WO2023065702A1
Application number: PCT/CN2022/100427
Authority: WO
Inventors: 李俊辉; 齐会龙; 聂革; 胡勇齐; 宋文正
Original assignee: 深圳市吉迩科技有限公司
Priority date: 2021-10-22
Filing date: 2022-06-22
Publication date: 2023-04-27
Also published as: CN113912412A

Abstract

A porous ceramic atomizing core and a preparation method therefor, and an electronic cigarette. The preparation method comprises the following process: providing raw materials, the raw materials comprising a ceramic aggregate, a binder, a fluxing agent, and a pore-forming agent, wherein the pore-forming agent is selected from one or two of graphite powder and carbon powder; performing wet mixing on the ceramic aggregate, the binder, the fluxing agent, and the pore-forming agent to obtain a mixture; molding the mixture to obtain a green body; degreasing the green body, and removing the binder to obtain a degreased green body; placing the degreased green body in a vacuum or oxygen-free atmosphere for sintering, the temperature of the sintering being 1100°C-1500°C, and thus obtaining a sintered green body; placing the sintered green body in an oxygen-containing atmosphere for heating reaction, the temperature of the heating reaction being 400°C-800°C, the pore-forming agent reacting with oxygen in the oxygen-containing atmosphere, and removing the pore-forming agent to obtain the porous ceramic atomizing core. According to the preparation method, the porous ceramic atomizing core having high strength and high porosity can be obtained.

Description

Porous ceramic atomizing core, preparation method thereof, and electronic cigarette

technical field

The present application relates to the technical field of ceramic materials, and more specifically, to a porous ceramic atomizing core, a preparation method thereof, and an electronic cigarette.

Background technique

The raw materials of the existing porous ceramic atomizing core mainly include ceramic aggregate, binder, flux and pore-forming agent. The preparation method usually includes four steps: mixing, molding, degreasing and sintering. Among them, degreasing is used to remove the pore-forming agent and binder to form a porous structure. Sintering mainly improves the strength of porous ceramics through high temperature. As the sintering temperature increases, the texture of ceramics becomes more and more dense, thereby increasing the strength. However, in order to maintain the porosity of the porous structure, and The sintering temperature is not allowed to be too high, otherwise, with the increase of the sintering temperature, the porous structure will shrink more and more, and the porosity will become smaller. In addition, the porous structure is prone to collapse during the shrinkage process. Therefore, the existing porous ceramic atomization It is difficult for the core to meet high strength under the condition of high porosity, and the strength is low. The atomizing core is not only easy to drop powder, which affects the taste of the suction, but also easy to be damaged during assembly, which affects the product yield.

Contents of the invention

The purpose of the present application is to overcome the above-mentioned defects in the prior art, and provide a high-strength and high-porosity porous ceramic atomizing core, a preparation method thereof, and an electronic cigarette.

In order to achieve the above object, the technical scheme of the present application is as follows:

A method for preparing a porous ceramic atomizing core, comprising the following processes:

Provide raw materials, the raw materials include: ceramic aggregate, binder, flux and pore-forming agent, wherein the pore-forming agent is selected from one or both of graphite powder and carbon powder;

wet mixing the ceramic aggregate, the binder, the flux and the pore-forming agent to obtain a mixture;

molding the mixture to obtain a green body;

Degreasing the green body, removing the binder, and obtaining a degreased green body;

Sintering the degreased green body in a vacuum or an oxygen-free atmosphere at a temperature of 1100°C to 1500°C to obtain a sintered green body;

The sintered green body is placed in an oxygen-containing atmosphere for a heating reaction, the temperature of the heating reaction is 400°C to 800°C, the pore-forming agent reacts with the oxygen in the oxygen-containing atmosphere, and the A pore-forming agent to obtain the porous ceramic atomizing core.

The present application also provides a porous ceramic atomizing core prepared by the above preparation method.

The present application also provides an electronic cigarette, including a main body and the above-mentioned porous ceramic atomizing core, and the porous ceramic atomizing core is installed on the main body.

Implementing the embodiment of the present application will have the following beneficial effects:

In the embodiment of the present application, graphite and/or carbon powder are used as pore-forming agents. The pore-forming agents are resistant to high temperatures and cannot be removed during degreasing and sintering, so that the strength of ceramics can be improved by setting a higher sintering temperature; Heating reaction after sintering, the pore-forming agent graphite and/or carbon powder can react with oxygen in the oxygen-containing atmosphere at a lower temperature of 400 ° C to 800 ° C lower than the sintering temperature, and remove the gas that generates carbon oxides , since the step of removing the pore-forming agent is arranged after the sintering step, and the heating temperature is lower than the sintering temperature, the texture of the ceramic will no longer shrink during the process of removing the pore-forming agent, and the resulting porosity and pore size will basically not change. The porosity and pore size are easy to control, so the present application can obtain a porous ceramic atomizing core with high strength and high porosity.

The ultra-high temperature sintering process of the present application can effectively remove the residual organic matter of the binder in the porous ceramic, so that the obtained porous ceramic atomizing core is purer and healthier.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present application. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

in:

Fig. 1 is a SEM image of the porous ceramic atomizing core prepared in Example 1 of the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

The present application discloses a preparation method of a porous ceramic atomizing core, comprising the following steps:

Step 1: Provide raw materials, including: ceramic aggregate, binder, flux and pore-forming agent, wherein the pore-forming agent is selected from one or both of graphite powder and carbon powder.

Step 2: wet mixing the ceramic aggregate, binder, flux and pore forming agent to obtain a mixture.

Step 3: molding the mixture to obtain a green body.

Step 4: degreasing the green body, removing the binder, and obtaining a degreased green body.

Step 5: Put the degreased green body in a vacuum or an oxygen-free atmosphere for sintering. The sintering temperature is 1100°C-1500°C. The pore-forming agent is sintered at this temperature without melting to obtain a sintered green body.

Step 6: Put the sintered body in an oxygen-containing atmosphere for heating reaction, the temperature of the heating reaction is 400°C-800°C, the pore-forming agent reacts with the oxygen in the oxygen-containing atmosphere, removes the pore-forming agent, and obtains porous ceramics atomizing core.

The present application uses graphite and/or carbon powder as a pore-forming agent, which is resistant to high temperatures and cannot be removed during degreasing and sintering, so that the strength of ceramics can be improved by setting a higher sintering temperature; through sintering After the heating reaction, the pore-forming agent graphite and/or carbon powder can react with the oxygen in the oxygen-containing atmosphere at a lower temperature of 400 ° C to 800 ° C lower than the sintering temperature, and the gas that generates carbon oxides is removed. The step of removing the pore-forming agent is set after the sintering step, and the heating temperature is lower than the sintering temperature. Therefore, during the process of removing the pore-forming agent, the ceramic texture will no longer shrink, and the resulting porosity and pore size will basically not change. The porosity And the pore size is easy to control, so the present application can obtain a porous ceramic atomizing core with high strength and high porosity.

In a specific embodiment, the average particle size of the pore-forming agent is 10 μm to 50 μm, specifically 20 μm, 30 μm or 40 μm, etc. Since the preparation method of the present application is to sinter first and then create pores, the size of the ceramic shrinks when creating pores Therefore, the obtained pore size is basically about the size of the pore-forming agent, that is, pores with a pore size of 10 μm to 50 μm can be obtained. Therefore, the particle size of the pore-forming agent determines the pore size of the porous ceramic atomizing core. By controlling the particle size of the pore-forming agent, the pore size can be controlled, which facilitates mass production and obtains a consistent atomizing core.

Further, in a specific embodiment, the quality of the pore-forming agent: the sum of the quality of the ceramic aggregate and the flux = 0.6-0.8, so that the porosity can reach a high porosity of 60%-80%. The reason why the porosity can be passed by controlling the mass ratio of the pore-forming agent to the ceramic aggregate and the flux is that in the preparation method of sintering first and then pore-forming in the present application, the removal of the pore-forming agent will not cause Variations in ceramic volume and morphology, therefore, porosity can be controlled by the aforementioned mass ratios. High porosity can increase the amount of smoke and the degree of reduction of the atomizing core to the atomization of e-liquid, and improve the taste of smoking.

In step 1, the ceramic aggregate, pore forming agent, flux and strength enhancer are all dried raw materials. Conditions for drying the ceramic aggregate, pore forming agent, flux and strength enhancer may be as follows: the drying temperature is 80°C-120°C, and the drying time is 8h-24h.

In step 2, all components can be mixed together at the same time, or some components can be mixed first to form a uniform premix, and then the premix can be mixed with the remaining components to obtain the final mixture. The method of grinding and mixing can also be used to grind and mix the components with the same particle size together to make the powder particle size more uniform.

In a preferred embodiment, molding includes the following steps:

Step 31: Banbury or knead the mixed material to obtain banbury/kneaded material.

In this step, the mixed material can be placed in a banbury mixer for banburying to obtain a banbury, or the mixed material can be placed in a kneader for kneading to obtain a kneaded material. Specifically, the conditions for banburying or kneading can be: The rotation speed is 200 rpm to 1500 rpm, the temperature is 70 ° C to 150 ° C, and the time is 1 h to 10 h, in order to make the mixture soft, dense, uniform, smooth and tough, easy to shape, and make the final product The resulting ceramics are of better quality.

Step 32: Granulate or crush the banburying/kneading material to obtain granules.

Step 33: Injection molding the pellets to obtain a green body.

The main purpose of step 4 is to remove the binder. The removal mentioned here can be incomplete removal with a small amount of residue, because the binder is mainly an organic solvent with a low boiling point, and it can also be used in the subsequent sintering and pore-making processes. It is further removed by heating and volatilization.

Specifically, in a specific embodiment, the process of degreasing is: heating up to 150°C-190°C at a heating rate of 0.01°C/min-5°C/min, keeping it warm for 1h-10h, and then heating at a rate of 0.05°C/min-2°C Raise the temperature to 200°C-240°C at a heating rate of /min, keep it warm for 1h-10h, and obtain a degreased green body after cooling. Different temperature sections adopt different heating rates, so that different binder components can be completely decomposed and volatilized at different temperature sections.

In step 5, the degreased body obtained in step 4 can be placed in a vacuum sintering furnace for sintering, or placed in an atmosphere sintering furnace for sintering under the protection of an oxygen-free atmosphere. It is worth noting that, during the whole sintering process, it should be carried out under vacuum conditions or under the protection of an oxygen-free atmosphere.

When under vacuum conditions, the vacuum degree should always be kept below 10Pa. When under the protection of an oxygen-free atmosphere, the oxygen-free atmosphere can specifically be argon, nitrogen or argon-hydrogen mixed gas.

Specifically, in a specific embodiment, the sintering process may be as follows: heating up to 1100°C-1500°C at a heating rate of 1°C/min-20°C/min, keeping the temperature for 1h-10h, and cooling to obtain a sintered green body .

In step 6, specifically, in a preferred embodiment, the heating reaction process can be as follows: heating up to 400°C-800°C at a heating rate of 1°C/min-5°C/min, keeping the temperature for 1h-5h, cooling Finally, a porous ceramic atomizing core is obtained.

In a specific embodiment, the raw materials of the porous ceramic atomizing core include 10%-60% ceramic aggregate, 2%-40% flux, 5%-40% binder and 10% ~70% pore former.

In order to further enhance the strength of the porous ceramic atomizing core in the present application, in a specific embodiment, the raw material also includes a strength enhancer, and the strength enhancer can be selected from one of aluminum oxide, zinc oxide, magnesium oxide, calcium carbonate and calcium oxide. The strength enhancer is mainly used to form a porous ceramic atomizing core together with ceramic aggregate and flux to enhance the strength of the porous ceramic atomizing core material itself.

In a specific embodiment, the average particle size of the strength enhancer is 1 nm to 10 μm. More preferably, the strength enhancer is a nanoscale powder, that is, the average particle size is 1 nm to 100 nm. In addition to the properties of the material itself, it also has The activity, large specific surface area, and strong adsorption brought by the nanoscale size can further enhance the strength of the porous ceramic atomizing core material itself. In addition, the nano-scale powder also has the function of fluxing. The smaller the particle size, the lower the melting point and the greater the fluidity, which can make the component distribution of each raw material more uniform during the sintering process, the texture is tighter, and the strength is higher. In addition, nano-scale powder also has bonding properties. Ceramic aggregates are usually micron-scale powders, and nano-scale powders are dispersed in micron-scale powders, which can make the bonding performance between components stronger and make the texture tighter. .

In a preferred embodiment, the raw materials of the porous ceramic atomizing core include 10% to 60% of ceramic aggregate, 2% to 40% of flux, 5% to 40% of binder, 10% %-70% pore forming agent and 0.1%-5% strength enhancer, using the raw materials of this embodiment, combined with the preparation method of this application, can greatly increase the compressive strength of the porous ceramic atomizing core.

In each of the above-mentioned embodiments, the ceramic aggregate can be selected from aluminum oxide powder, sepiolite powder, cordierite powder, diatomaceous earth, feldspar (such as potassium feldspar, albite), quartz powder and andalusite powder, etc. One or more than two. Among them, diatomite is porous, high temperature resistant, strong and wear-resistant, which can ensure the strength, toughness and adsorption of the porous ceramic atomizing core, and is a porous ceramic atomizing core aggregate with excellent performance.

The fluxing agent can be selected from one or both of low-temperature glass powder and clay, wherein the clay can be kaolin, tourmaline, vermiculite, etc. The function of the fluxing agent is mainly to reduce the sintering temperature of the ceramic aggregate, so that the green body The texture is tighter during sintering.

The binder can be selected from one or more of paraffin wax, polyethylene or ethylene-vinyl acetate copolymer and stearic acid. The binder is mainly used for wet mixing and is easy to shape into a green body.

In a specific embodiment, the average particle size of the fluxing agent is 1 nm-1 μm, more preferably 1 nm-100 nm, and the nano-scale powder has greater fluidity and can have a more significant fluxing effect.

In a specific embodiment, the average particle diameter of the ceramic aggregate is 10 μm˜100 μm.

The present application also discloses a porous ceramic atomizing core prepared by the above preparation method. The porosity of the porous ceramic atomizing core can be 60% to 75%, the average pore size can be 10 μm to 30 μm, and the compressive strength can be compared with the existing Technology can be improved by 1 to 2 times.

The present application also discloses an electronic cigarette, which includes a host and the above-mentioned porous ceramic atomizing core. The porous ceramic atomizing core is installed on the host, and the host provides power and atomization control for the atomizing core.

The following are specific examples.

Example 1

Put the diatomaceous earth powder in a drying oven for drying, set the temperature at 100° C., and dry for 12 hours. Use high precision balance to weigh this diatomite 480g. Then weigh 480g graphite powder, 100g low-temperature glass powder, 10g magnesium oxide powder, 10g zinc oxide powder and 120g kaolin. Among them, the particle size of diatomite is 30 μm, the particle size of graphite powder is 30 μm, the particle size of low-temperature glass powder, magnesium oxide, and zinc oxide is nanoscale, and the particle size of kaolin is 10 μm. Place the above-weighed powder in a three-dimensional mixer and mix it uniformly for 4 hours to obtain a premix. Weigh 600g paraffin, 100g polyethylene and 100g stearic acid as binder. The binder and the premix are put together in an internal mixer for internal mixing, the speed is set at 500 rpm, the temperature is 130° C., and the time is 6 hours to obtain the internal mixing material. The prepared banburying material is cooled to room temperature and then poured into a granulator for granulation to obtain uniform granules. Then the pellets are used for injection molding to obtain green bodies. Place the green body in a straw-burning crucible, and place it together in a degreasing furnace for degreasing. The furnace temperature is raised to 160°C at a rate of 0.05°C/min, and kept for 5 hours. Then increase the temperature to 210°C at a rate of 1°C/min, keep it warm for 5 hours, cool down to room temperature, and take it out. The obtained degreased green body was placed in a vacuum sintering furnace to keep the vacuum below 10Pa throughout the process, and the temperature was raised to 1400°C at a heating rate of 5°C/min, kept for 2h, and then lowered to room temperature. Put the sintered green body in an atmospheric sintering furnace, raise the temperature to 600°C at a rate of 1°C/min, keep it warm for 3 hours, cool to room temperature and take it out to obtain a high-strength porous ceramic atomizing core. The strength, porosity and pore size of the obtained porous ceramic atomizing core are shown in Table 2. Finally, the obtained ceramic body is combined with heating resistance wire or resistance slurry, and after sintering, a ceramic atomizing core for electronic cigarette field is obtained.

Embodiment 2-8

Compared with Example 1, the difference between Examples 2-8 is that the percentages of each component are different. The components and the parameters of each step are the same as in Example 1. The percentages of each component are shown in Table 1. The obtained porous ceramic atomized The strength, porosity and pore size of the core are shown in Table 2.

Table 1: each component percentage/% of embodiment 1～8

Example 9

The only difference between Example 9 and Example 2 is that the particle size of the graphite in Example 9 is 20 μm, which is smaller than that of Example 2, 30 μm, and the rest are the same. The strength, porosity and pore size of the porous ceramic atomizing core obtained are As shown in table 2.

As can be seen from Table 2: comparing Example 9 with Example 2, the pore diameter of Example 9 is 15 ± 5 μm, which is less than 18 ± 5 μm of Example 2, and the porosity of Example 9 is approximately equal to the porosity of Example 2 ratio, are 70 ± 2%, it can be seen that the pore diameter of the pores in the porous ceramic structure obtained in Example 9 is small, and the number is large. Compared with Example 9, the pore diameter of the pores in the porous ceramic structure obtained in Example 2 is large, and the number is small. . In addition, it can also be seen from Table 2 that the compressive strength of Example 9 is 530±50N/mm ² , which is greater than 500±50N/mm ² of Example 2. It can be seen that the porosity is close, and the smaller the pore diameter, the higher the compressive strength. bigger.

Experimental example 1

Referring to Figure 1, Figure 1 shows the SEM image of the porous ceramic atomizing core prepared in Example 1. From the image in Figure 1, it can be seen that after high-temperature sintering, a complete skeleton is formed between the ceramic particles, which greatly improves the ceramic overall strength.

Comparative example 1

Put the diatomaceous earth powder in a drying oven for drying, set the temperature at 100° C., and dry for 12 hours. Use high precision balance to weigh this diatomite 480g. Then weigh 480g graphite powder, 100g low-temperature glass powder, 10g magnesium oxide powder, 10g zinc oxide powder and 120g kaolin. Among them, the particle size of diatomite is 30 μm, the particle size of graphite powder is 30 μm, the particle size of low-temperature glass powder, magnesium oxide, and zinc oxide is nanoscale, and the particle size of kaolin is 10 μm. Place the above-weighed powder in a three-dimensional mixer and mix it uniformly for 4 hours to obtain a premix. Weigh 600g paraffin, 100g polyethylene and 100g stearic acid as binder. The binder and the premix are put together in an internal mixer for internal mixing, the speed is set at 500 rpm, the temperature is 130° C., and the time is 6 hours to obtain the internal mixing material. The prepared banburying material is cooled to room temperature and then poured into a granulator for granulation to obtain uniform granules. Then the pellets are used for injection molding to obtain green bodies. Place the green body in a straw-burning crucible, and place it together in a degreasing furnace for degreasing. The furnace temperature is raised to 160°C at a rate of 0.05°C/min, and kept for 5 hours. Then increase the temperature to 210°C at a rate of 1°C/min, keep it warm for 5 hours, cool down to room temperature, and take it out. The degreased green body obtained was placed in an atmospheric sintering furnace, and the temperature was raised to 800°C at a heating rate of 1°C/min, and kept for 2 hours, and then continued to be heated at a heating rate of 1°C/min to 1200°C, and kept for 2 hours. Cool to room temperature and take out to obtain a porous ceramic atomizing core. The strength, porosity and pore size of the obtained porous ceramic atomizing core are shown in Table 2.

Compared with Example 1, Comparative Example 1 differs in that the degreased green body obtained in Comparative Example 1 is not sintered at a high temperature in a vacuum or an oxygen-free atmosphere, but is directly placed in the atmosphere for sintering, that is, sintering and pore making At the same time, referring to Table 2, comparing Example 1 and Comparative Example 1, the compressive strength of the porous ceramic atomizing core prepared in Comparative Example 1 was reduced to 260±40N/mm ² , compared to 550±40N/mm 2 in Example 1. 50N/mm ² , almost a 50% drop.

Comparative example 2

Put the diatomaceous earth powder in a drying oven for drying, set the temperature at 100° C., and dry for 12 hours. Use high precision balance to weigh this diatomite 480g. Then weigh 480g graphite powder, 100g low-temperature glass powder, 10g magnesium oxide powder, 10g zinc oxide powder and 120g kaolin. Among them, the particle size of diatomite is 30 μm, the particle size of graphite powder is 30 μm, the particle size of low-temperature glass powder, magnesium oxide, and zinc oxide is nanoscale, and the particle size of kaolin is 10 μm. Place the above-weighed powder in a three-dimensional mixer and mix it uniformly for 4 hours to obtain a premix. Weigh 600g paraffin, 100g polyethylene and 100g stearic acid as binder. The binder and the premix are put together in an internal mixer for internal mixing, the speed is set at 500 rpm, the temperature is 130° C., and the time is 6 hours to obtain the internal mixing material. The prepared banburying material is cooled to room temperature and then poured into a granulator for granulation to obtain uniform granules. Then the pellets are used for injection molding to obtain green bodies. Place the green body in a straw-burning crucible, and place it together in a degreasing furnace for degreasing. The furnace temperature is raised to 160°C at a rate of 0.05°C/min, and kept for 5 hours. Then increase the temperature to 210°C at a rate of 1°C/min, keep it warm for 5 hours, cool down to room temperature, and take it out. The degreased green body obtained was placed in an atmospheric sintering furnace, and the temperature was raised to 1400° C. at a heating rate of 5° C./min, kept for 2 hours, and then lowered to room temperature to obtain a porous ceramic atomizing core.

Compared with Example 1, Comparative Example 2 differs in that the degreased green body obtained in Comparative Example 2 is not sintered at a high temperature in a vacuum or an oxygen-free atmosphere, but is directly placed in the atmosphere for sintering, and the sintering conditions are different from Compared with the staged temperature rise and lower sintering temperature (1200°C) of Example 1, the faster heating rate and higher sintering temperature (1500°C) in the vacuum sintering step of Example 1 were adopted, and the sintering and pore formation also At the same time, however, part of the porous ceramic atomizing core produced in Comparative Example 2 collapsed, and the product was scrapped. The reason may be that the heating rate was too fast, or the sintering temperature was too high, which caused the ceramic volume to shrink too much, resulting in collapse. Visible , sintering and pore making are carried out at the same time, the heating rate cannot be too fast, and the sintering temperature cannot be too high.

Table 2: Strength, porosity and pore diameter of porous ceramic atomizing cores obtained in various examples and comparative examples

the	平均抗压强度/N/mm ² Average compressive strength/N/mm ²	平均孔径/μmAverage pore size/μm	平均孔隙率/％Average porosity/%
实施例1Example 1	550550	2020	6868
实施例2Example 2	500500	1818	7070
实施例3Example 3	620620	1818	6363
实施例4Example 4	600600	1616	6565
实施例5Example 5	600600	1515	6262
实施例6Example 6	500500	1818	6060
实施例7Example 7	470470	1515	6060
实施例8Example 8	420420	1515	5858
实施例9Example 9	530530	1515	7070
对比例1Comparative example 1	260260	2020	6060
对比例2Comparative example 2	————	————	————

The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is relatively specific and detailed, but should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of protection of the patent application should be based on the appended claims.

Claims

A method for preparing a porous ceramic atomizing core, which includes the following process:

Provide raw materials, the raw materials include: ceramic aggregates, binders, fluxes and pore-forming agents, wherein the pore-forming agents are selected from one or both of graphite powder and carbon powder;

wet mixing the ceramic aggregate, the binder, the flux and the pore-forming agent to obtain a mixture;

molding the mixture to obtain a green body;

Degreasing the green body, removing the binder, and obtaining a degreased green body;

Sintering the degreased green body in a vacuum or an oxygen-free atmosphere at a temperature of 1100°C to 1500°C to obtain a sintered green body;

The sintered green body is placed in an oxygen-containing atmosphere for a heating reaction, the temperature of the heating reaction is 400°C to 800°C, the pore-forming agent reacts with the oxygen in the oxygen-containing atmosphere, and the A pore-forming agent to obtain the porous ceramic atomizing core.
The method for preparing a porous ceramic atomizing core according to claim 1, wherein the average particle diameter of the pore-forming agent is 10 μm-50 μm.
The method for preparing a porous ceramic atomizing core according to claim 2, wherein the mass of the pore forming agent: the mass sum of the ceramic aggregate and the flux = 0.6-0.8.
The preparation method of the porous ceramic atomizing core according to claim 1, wherein, the sintering process is: heating up to 1100°C-1500°C at a heating rate of 1°C/min-20°C/min, and holding the temperature for 1h-10h , to obtain the sintered green body after cooling;

The process of the heating reaction is: heating up to 400-800°C at a heating rate of 1°C/min-5°C/min, keeping the temperature for 1h-5h, and obtaining the porous ceramic atomizing core after cooling;

The degreasing process is as follows: heat up to 150°C-190°C at a heating rate of 0.01°C/min-5°C/min, keep warm for 1h-10h, and then heat up to 200°C at a heating rate of 0.05°C/min-2°C/min ℃～240℃, heat preservation for 1h～10h, and obtain the degreased green body after cooling.
The method for preparing a porous ceramic atomizing core according to claim 2, wherein the sintering process is: heating up to 1100°C-1500°C at a heating rate of 1°C/min-20°C/min, and holding the temperature for 1h-10h , to obtain the sintered green body after cooling;

The process of the heating reaction is: heating up to 400-800°C at a heating rate of 1°C/min-5°C/min, keeping the temperature for 1h-5h, and obtaining the porous ceramic atomizing core after cooling;

The degreasing process is as follows: heat up to 150°C-190°C at a heating rate of 0.01°C/min-5°C/min, keep warm for 1h-10h, and then heat up to 200°C at a heating rate of 0.05°C/min-2°C/min ℃～240℃, heat preservation for 1h～10h, and obtain the degreased green body after cooling.
The preparation method of the porous ceramic atomizing core according to claim 3, wherein the sintering process is: raising the temperature to 1100°C-1500°C at a heating rate of 1°C/min-20°C/min, and holding the temperature for 1h-10h , to obtain the sintered green body after cooling;

The process of the heating reaction is as follows: heating up to 400°C-800°C at a heating rate of 1°C/min-5°C/min, keeping the temperature for 1h-5h, and obtaining the porous ceramic atomizing core after cooling;

The degreasing process is as follows: heat up to 150°C-190°C at a heating rate of 0.01°C/min-5°C/min, keep warm for 1h-10h, and then heat up to 200°C at a heating rate of 0.05°C/min-2°C/min ℃～240℃, heat preservation for 1h～10h, and obtain the degreased green body after cooling.
The preparation method of the porous ceramic atomizing core according to claim 1, wherein, the raw material also includes a strength enhancer, and the strength enhancer is selected from aluminum oxide, zinc oxide, magnesium oxide, calcium carbonate and calcium oxide one or more;

In terms of mass percentage, the mass percentage of the ceramic aggregate is 10% to 60%, the mass percentage of the flux is 2% to 40%, and the mass percentage of the binder is 5% to 40%. The mass percentage of the pore forming agent is 10%-70%, and the mass percentage of the strength enhancer is 0.1%-5%.
The preparation method of the porous ceramic atomizing core according to claim 2, wherein, the raw material also includes a strength enhancer, and the strength enhancer is selected from aluminum oxide, zinc oxide, magnesium oxide, calcium carbonate and calcium oxide one or more;

In terms of mass percentage, the mass percentage of the ceramic aggregate is 10% to 60%, the mass percentage of the flux is 2% to 40%, and the mass percentage of the binder is 5% to 40%. The mass percentage of the pore forming agent is 10%-70%, and the mass percentage of the strength enhancer is 0.1%-5%.
The preparation method of the porous ceramic atomizing core according to claim 3, wherein, the raw material also includes a strength enhancer, and the strength enhancer is selected from aluminum oxide, zinc oxide, magnesium oxide, calcium carbonate and calcium oxide one or more;

In terms of mass percentage, the mass percentage of the ceramic aggregate is 10% to 60%, the mass percentage of the flux is 2% to 40%, and the mass percentage of the binder is 5% to 40%. The mass percentage of the pore forming agent is 10%-70%, and the mass percentage of the strength enhancer is 0.1%-5%.
The preparation method of the porous ceramic atomizing core according to claim 7, wherein the ceramic aggregate is selected from alumina powder, sepiolite powder, cordierite powder, diatomite, feldspar, quartz powder and andalusite powder one or more of them;

The flux is selected from one or more of low-temperature glass powder and clay;

The binder is selected from one or more of paraffin wax, polyethylene or ethylene-vinyl acetate copolymer and stearic acid.
The preparation method of the porous ceramic atomizing core according to claim 8, wherein the ceramic aggregate is selected from alumina powder, sepiolite powder, cordierite powder, diatomite, feldspar, quartz powder and andalusite powder one or more of them;

The flux is selected from one or more of low-temperature glass powder and clay;

The binder is selected from one or more of paraffin wax, polyethylene or ethylene-vinyl acetate copolymer and stearic acid.
The preparation method of the porous ceramic atomizing core according to claim 9, wherein the ceramic aggregate is selected from alumina powder, sepiolite powder, cordierite powder, diatomite, feldspar, quartz powder and andalusite powder one or more of them;

The flux is selected from one or more of low-temperature glass powder and clay;

The binder is selected from one or more of paraffin wax, polyethylene or ethylene-vinyl acetate copolymer and stearic acid.
The method for preparing a porous ceramic atomizing core according to claim 7, wherein the average particle size of the ceramic aggregate is 10 μm to 100 μm;

The average particle diameter of the strength enhancer is 1 nm to 10 μm;

The average particle diameter of the flux is 1 nm˜1 μm.
The preparation method of the porous ceramic atomizing core according to claim 8, wherein the average particle diameter of the ceramic aggregate is 10 μm to 100 μm;

The average particle diameter of the strength enhancer is 1 nm to 10 μm;

The average particle diameter of the flux is 1 nm˜1 μm.
The method for preparing a porous ceramic atomizing core according to claim 9, wherein the average particle size of the ceramic aggregate is 10 μm to 100 μm;

The average particle diameter of the strength enhancer is 1 nm to 10 μm;

The average particle diameter of the flux is 1 nm˜1 μm.
The preparation method of the porous ceramic atomizing core according to claim 1, wherein said molding comprises the following process:

Banburying or kneading the mixture to obtain banburying/kneading;

Granulating or crushing the banburying/kneading material to obtain granules;

The pellets are injection molded to obtain the green body.
The preparation method of the porous ceramic atomizing core according to claim 2, wherein said forming comprises the following process:

Banburying or kneading the mixture to obtain banburying/kneading;

Granulating or crushing the banburying/kneading material to obtain granules;

The pellets are injection molded to obtain the green body.
The preparation method of the porous ceramic atomizing core according to claim 3, wherein said forming comprises the following process:

Banburying or kneading the mixture to obtain banburying/kneading;

Granulating or crushing the banburying/kneading material to obtain granules;

The pellets are injection molded to obtain the green body.
A porous ceramic atomizing core, which is produced by the preparation method as claimed in claim 1.
An electronic cigarette, comprising a host and the porous ceramic atomizing core according to claim 19, the porous ceramic atomizing core is installed on the host.