CN115028366B

CN115028366B - Atomizing core, preparation method thereof and electronic atomizing device

Info

Publication number: CN115028366B
Application number: CN202110250683.6A
Authority: CN
Inventors: 江品颐; 杨伟强; 刘双任; 吴学通; 林信平
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2021-03-08
Filing date: 2021-03-08
Publication date: 2023-12-12
Anticipated expiration: 2041-03-08
Also published as: CN115028366A

Abstract

The application provides a preparation method of an atomization core, which comprises the following steps: preparing a mixed material containing inorganic hollow microspheres with the particle size distribution range of 40-120 mu m, a pore-forming agent and a binder; the mixed material and the heating body are integrally formed into an atomization core green compact, and then sintered to obtain an atomization core; or after the mixed material is molded into a ceramic matrix green body, silk-screen printing a heating body pattern on the ceramic matrix green body, and sintering to obtain the atomization core. The inorganic hollow microspheres with regular shapes are introduced, so that the mechanical strength of the obtained atomization core is improved, and meanwhile, the atomization core has a good and stable atomization effect. The application also provides the atomizing core and an electronic atomizing device.

Description

Atomizing core, preparation method thereof and electronic atomizing device

Technical Field

The application relates to the technical field of ceramic atomizing cores, in particular to an atomizing core, a preparation method thereof and an electronic atomizing device.

Background

The atomizing core is an important component in the electronic cigarette product and mainly comprises a porous ceramic matrix and a heating body arranged on the porous ceramic matrix, and the porous ceramic matrix is utilized to adsorb tobacco tar to the heating body, so that the tobacco tar can be heated and atomized under the electric heating effect of the heating body. Currently, a porous ceramic matrix is generally obtained by sintering a solid inorganic powder as an aggregate, and a slurry formed by the solid inorganic powder, a binder, a pore-forming agent, and the like. However, most of the existing solid inorganic powder is irregular particles, and when the porous ceramic matrix bears load, cracks are easily generated due to stress concentration, so that the strength of the porous ceramic matrix is low, and the phenomenon of powder and slag falling easily occurs; in addition, the uniformity of the particle size of the irregular solid inorganic powder is poor, the gaps are irregular, and the pore diameters of the porous ceramic matrix are not uniform, so that the atomization effect is not improved.

Disclosure of Invention

In view of the above, the application provides a preparation method of an atomization core, which is characterized in that inorganic hollow microspheres with regular shapes and uniform particle sizes are introduced as aggregate to prepare the atomization core, so that the mechanical strength of the obtained atomization core is improved, and meanwhile, the obtained atomization core has a good and stable atomization effect.

In a first aspect, the present application provides a method of preparing an atomizing core, comprising the steps of:

preparing a mixed material containing inorganic hollow microspheres, a pore-forming agent and a binder; wherein the particle size of the inorganic hollow microspheres is 40-120 mu m;

the mixed material and the heating body are integrally formed into an atomization core green compact, and then sintered to obtain an atomization core; or after the mixed material is molded into a ceramic matrix green body, silk-screen printing a heating body pattern on the ceramic matrix green body, and sintering to obtain the atomization core.

According to the preparation method of the atomization core, the inorganic hollow microspheres are used as ceramic aggregate to prepare the ceramic atomization core, the risks of cracks of the atomization core caused by stress concentration can be reduced by means of the regular shape, smooth surface, uniform particle size and the like of the inorganic hollow microspheres, the mechanical properties (such as crushing resistance and bending resistance) of the atomization core are improved, the uniformity of the pore diameter of the atomization core can be improved by means of the uniformity of the particle size of the inorganic hollow microspheres and the regular gaps with proper size brought by proper particle size range, the fineness of atomized smoke is improved, and the atomization core is not easy to generate the conditions of paste core, oil leakage and the like, so that the atomization core has good and stable atomization effect. In addition, the atomization core prepared by using the hollow microspheres as aggregate has lower heat conductivity than the atomization core prepared by using the solid particles/microspheres, and is more beneficial to concentrating the heat generated by the heating element, so that the response speed of the smoke and oil atomization can be improved.

In the application, the mixed material can be specifically mixed powder containing inorganic hollow microspheres, pore-forming agent and binder or mixed slurry formed by heating the mixed powder. The molding mode of the mixed material can be slip casting or powder pressing. The slip casting may be performed by injecting the mixed slurry into a mold at a predetermined temperature and pressure or into a mold in which a heating element is placed. The powder pressing is to press the mixed powder under a certain pressure. The mixed powder can be feeding particles of inorganic hollow microspheres, pore formers and binders.

In an embodiment of the present application, the inorganic hollow microspheres are regular spheres, the interiors of which are substantially hollow, and the surfaces of which do not have micropores. The inorganic hollow microspheres are regular in shape, and gaps among the inorganic hollow microspheres are also regular in the porous ceramic matrix prepared from the inorganic hollow microspheres, so that the pore diameter uniformity of the porous ceramic matrix is improved; and the porous ceramic matrix has low heat conductivity, so that the atomization speed and the atomization fineness of the atomization core to tobacco tar can be improved.

Specifically, the inorganic hollow microspheres may be made of one or more of alumina, silica, titania, silicon carbide, aluminosilicate, glass, and the like. In an embodiment of the present application, the particle size distribution of the inorganic hollow microspheres is in the range of 40 μm to 120 μm. The particle size of the inorganic hollow microsphere is in the range, the stress concentration is not easy to occur, the shock resistance is strong, and the mechanical properties (such as crushing resistance) of the atomization core can be better improved. In addition, by adopting the inorganic hollow microspheres with the particle size in the range, the porous ceramic matrix of the atomization core obtained after sintering can have a proper number of hollow microsphere gaps with proper size, so that the smoke oil can be ensured to have proper conduction speed in the porous ceramic matrix and atomized to be finer.

If the particle size of the inorganic hollow microspheres is too large, the contact area between the microspheres in the porous ceramic matrix of the atomizing core is small, the cohesion is weak, and the gaps between the inorganic hollow microspheres are too large, so that the improvement of the smoke atomization fineness is not facilitated, and the capillary force of the pores is reduced, so that the oil locking capacity is reduced, and the atomizing core is easier to leak oil when in use. If the particle size of the inorganic hollow microspheres is too small, the number of gaps among the inorganic hollow microspheres is too large and the gaps are too small, so that the conduction speed of tobacco tar is not improved, when the conduction speed of the tobacco tar is lower than the atomization speed of the tobacco tar, the atomized smoke is more easy to be burnt when the atomized smoke is used, and the atomized smoke has burnt taste.

The particle size of the inorganic hollow microspheres may be, for example, 45 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm or 110 μm. In some embodiments of the application, the inorganic hollow microspheres have a particle size distribution ranging from 45 μm to 90 μm. At this time, the atomizing core can better give consideration to high mechanical strength and good atomizing effect. In other embodiments, the inorganic hollow microspheres have a particle size distribution ranging from 45 μm to 65 μm, from 50 μm to 60 μm, or from 60 μm to 80 μm.

Optionally, the inorganic hollow microspheres have a D50 particle size in the range of 50 μm to 80 μm. Alternatively, the inorganic hollow microspheres have a D90 particle size in the range of 80-120 μm. The D10 particle size of the inorganic hollow microsphere is 10-40 μm.

Further, the particle size of the inorganic hollow microspheres satisfies the following conditions: (D90 particle diameter-D10 particle diameter)/D50 particle diameter is less than or equal to 1.5. At this time, the size concentration degree of the inorganic hollow microspheres is higher, the atomization core prepared from the inorganic hollow microspheres is less prone to the condition of stress concentration, the aperture is more uniform, and the mechanical property of the atomization core is better and the atomization effect is better.

The pore former may leave voids during sintering of the green body. Alternatively, the pore-forming agent includes one or more of high-temperature decomposable salts, inorganic carbon materials, natural organic particles, organic microspheres, and the like, but is not limited thereto. Wherein, inorganic carbon materials, natural organic particles, organic microspheres and the like can be removed during sintering to leave voids/holes, and the high-temperature decomposable salt can be decomposed to generate overflowable gas during sintering, and the voids/holes can be generated in the material after sintering. Specifically, the inorganic carbon material may include one or more of graphite, carbon black, carbon fiber, and the like. The high temperature decomposable salts may include bicarbonate salts (e.g., ammonium bicarbonate, sodium bicarbonate, etc.), ammonium carbonate, ammonium chloride, and the like. The natural organic particles may include starch particles, plant material (e.g., sawdust, rice hulls), and the like. The organic microspheres may include polymethyl methacrylate (PMMA) microspheres, polystyrene (PS) microspheres, polyvinyl alcohol (PVA) microspheres, and the like, and may also be referred to as "high molecular polymer microspheres". In some embodiments of the application, the pore-forming agent comprises one or more of sodium bicarbonate, graphite powder, carbon black powder, starch. In some embodiments, the pore former is a spherical pore former. The spherical pore-forming agent has regular appearance and easily controlled particle size. Alternatively, the pore former may have a particle size of 10 μm to 100 μm, which may allow the atomizing core to have a pore size of a suitable size. In some embodiments of the application, the pore former may have a particle size of 10 μm to 90 μm or 20 μm to 80 μm. In some embodiments, the pore former has a particle size of 10 μm to 30 μm. In this case, the pore-forming agent having a particle diameter in this range may be incorporated into the inorganic hollow microspheres to form a porous ceramic matrix having a suitable pore diameter. Optionally, the pore-forming agent has a particle size that: the (D90 particle size-D10 particle size)/D50 particle size is less than or equal to 1.5, so that the pore diameter uniformity generated by the pore-forming agent is higher.

In the embodiment of the application, the binder is an organic binder, can be melted into a liquid phase at a certain temperature, is favorable for improving the binding force among particles (such as among inorganic hollow microspheres, pore-forming agents and among inorganic hollow microspheres and pore-forming agents) in the mixed material, is convenient for forming a green body with a certain shape, can also improve the grouting fluidity of the mixed material, can well fill a die cavity with a complex shape under the action of pressure, and improves the forming effect. Wherein the organic binder is at least one selected from Paraffin wax (Paraffin wax), microcrystalline wax (CW), palm wax, sodium alginate, gelatin, polyvinyl alcohol (PVA), ethylene-vinyl acetate copolymer (ethylene vinyl acetate, EVA), polystyrene, polyethylene, polypropylene, etc., but is not limited thereto. In particular, when the mixture is formed by dry pressing, the organic binder is preferably at least one organic polymer compound such as PVA, EVA, polystyrene, polyethylene, polypropylene, etc.; when the mixture is molded by slip casting, the organic binder is preferably wax such as paraffin wax, microcrystalline wax, or the like.

In the embodiment of the application, the mixed material comprises the following components in percentage by mass: 40% -80% of inorganic hollow microspheres, 10% -30% of pore-forming agent, 4% -30% of binder, 0-20% of sintering aid and 0-5% of surfactant. In some embodiments, the inorganic hollow microspheres are 40%, 45%, 50%, 60%, 70%, 75% or 80% by mass of the mixture. Wherein, the inorganic hollow microsphere is controlled in the above range, so that the porous ceramic matrix sintered by the mixed material has proper mechanical strength and a certain pore space.

Optionally, the mass percentage of the sintering aid in the mixed material is 5% -20%. The proper amount of sintering aid can generate proper liquid phase in the ceramic sintering process, bond the framework phases, promote sintering densification and improve the strength of the obtained ceramic. Wherein the sintering aid is selected from one or more of glass powder, kaolin, feldspar, quartz, alumina, sodium silicate and the like, but is not limited thereto.

Optionally, the mass percentage of the surfactant in the mixed material is 0.1% -5%. The appropriate amount of surfactant can improve the dispersibility of the components in the mixture. The surfactant is one or more selected from stearic acid, silane coupling agent, oleic acid, ethyl cellulose and the like.

In some embodiments of the present application, the mixture comprises the following components in percentage by mass: 40% -80% of inorganic hollow microspheres, 10% -30% of pore-forming agent, 4% -30% of binder, 5% -20% of sintering aid and 0.1% -5% of surfactant. The proportion can lead the porous ceramic matrix sintered by the mixture to have good mechanical strength and proper porosity. In some embodiments, the sintering aid is present in the mixture in an amount of 10% to 30% by mass. Specifically, the mass percentage of the sintering aid in the mixed material is 10%, 12%, 15%, 20%, 25%, 28% or 30%.

In some embodiments of the application, the sintering aid is 10% -30% of the mass of the inorganic hollow microspheres. The sintering aid can better improve the density and cohesion of the porous ceramic matrix obtained by sintering in the range, and further can improve the mechanical strength of the porous ceramic matrix. In some embodiments, the mass of the sintering aid is 17% -28% of the mass of the inorganic hollow microspheres.

In the application, the heating element has a certain resistance, and can generate heat under the condition of electrifying, so that the tobacco tar is heated and atomized. The heating element may have a porous structure, and the material may be metal, conductive ceramic, or the like. Wherein the metal heat generating sheet having a porous structure may be perforated by at least one means of laser drilling, mechanical punching, mechanical drilling, chemical etching, etc. on the metal sheet to prepare holes of a certain size and interval thereon. In some embodiments of the present application, the heating element integrally formed with the above-mentioned mixed material may be a metal heating sheet having a porous structure, or a conductive ceramic having a porous structure obtained by sintering ceramic powder or slurry. When the ceramic matrix green body is sintered after silk-screen printing the pattern of the heating body, the obtained atomized core is still integrally formed, and no other connecting component between the porous ceramic matrix and the heating body is needed.

The sintering temperature at the time of sintering is, for example, 800-1200 ℃. The heat preservation duration at the sintering temperature can be 20min-2h.

The preparation method of the atomizing core provided by the first aspect of the application has the advantages of simple and controllable process, easiness in operation and capability of obtaining the atomizing core with good mechanical strength and atomizing effect.

In a second aspect, the application provides an atomization core, which comprises a porous ceramic matrix and a heating body arranged on the porous ceramic matrix, wherein the atomization core is prepared by adopting the preparation method of the first aspect.

In an embodiment of the present application, the porous ceramic substrate and the heating element are integrally formed. The problem of stress concentration at the joint caused by split molding can be avoided.

In an embodiment of the present application, the porous ceramic matrix has a porosity of 30% to 60%. The pore diameter of the porous ceramic matrix is in the range of 10-100 mu m. The pore diameter and the porosity of the porous ceramic matrix prepared by the preparation method are in the ranges, so that the porous ceramic matrix has proper smoke oil conduction rate and atomization effect under the condition of proper mechanical strength.

In some embodiments, the pore size of the porous ceramic matrix is in the range of 10-30 μm. The porosity of the porous ceramic matrix is 40% -60%. At this time, the porous ceramic matrix can better give consideration to good mechanical properties, proper tobacco tar conduction rate and atomization rate and good atomization effect.

Optionally, the pore size distribution of the porous ceramic matrix satisfies: (D90 pore size-D10 pore size)/D50 pore size < 1.

In an embodiment of the present application, the crush strength of the atomizing core is 75MPa or more. In some embodiments, the crush strength of the atomizing core is from 75MPa to 130MPa.

In an embodiment of the present application, the flexural strength of the atomizing core is 13MPa or more.

According to the atomization core provided by the second aspect of the application, the inorganic hollow microspheres are introduced to serve as ceramic aggregate of the porous ceramic matrix, so that the mechanical property of the atomization core can be better improved, and the atomization core has uniform particle size and proper pore diameter, so that a good and stable atomization effect is achieved.

In a third aspect, the present application provides an electronic atomising device comprising an atomising core as described above. The electronic atomizing device may be an electronic smoking article.

In particular, the atomizing core may be located within a cartridge of the electronic smoking article. The atomization core can guide tobacco tar in the tobacco tar bullet oil bin onto the heating body, and the smoke can be evaporated when the heating body is heated.

Due to the adoption of the atomization core, the smoke produced by the electronic atomization device is good in taste, high in plumpness, high in reduction degree of tobacco tar taste, capable of bringing better user experience to a user, good in smoke replacement effect, good in mechanical performance and long in service life.

Drawings

Fig. 1 is a schematic structural view of a atomizing core in an embodiment of the present application.

Detailed Description

The application is further illustrated by the following specific examples.

Example 1

A method of making an atomizing core comprising:

(1) Mixing hollow glass microspheres with the particle size range of 40-70 mu m and the D50 particle size of 50 mu m ((D90 particle size-D10 particle size)/D50 particle size=1.4) with a pore-forming agent, a binder, a sintering aid and a surfactant at 90 ℃ (the binder is in a liquid state at the temperature) to obtain mixed slurry; wherein the mixed slurry comprises the following components in percentage by mass: 43wt% of hollow glass microspheres, 12wt% of a pore-forming agent (specifically graphite powder with a particle size ranging from 10 μm to 30 μm, (D90 particle size-D10 particle size)/d50 particle size=0.5), 25wt% of a binder (specifically paraffin wax), 19wt% of a sintering aid (specifically solid glass powder) and 1wt% of a surfactant (specifically stearic acid);

(2) Placing a heating element (specifically a metal sheet with a plurality of holes) with a certain resistance into a mould and fixing, transferring the mixed slurry into a forming machine, and injecting the mixed slurry into the mould at a certain temperature and pressure to prepare an atomized core green body embedded with the heating element;

(3) And (3) placing the atomized core green body into a sintering boat, performing heat preservation and sintering for 2 hours at 900 ℃, cooling to room temperature along with a furnace to obtain an atomized core crude product, and polishing, cleaning and drying to obtain an atomized core finished product.

A schematic structural view of the atomizing core obtained in example 1 is shown in fig. 1, wherein a ceramic atomizing core 100 provided in example 1 includes a porous ceramic substrate 10 and a heat generating body 20 integrally formed on the porous ceramic substrate 10.

Example 2

A method of making an atomizing core comprising:

(1) Mixing hollow silicon carbide microspheres with the particle size range of 60-90 mu m and the D50 particle size of 70 mu m ((D90 particle size-D10 particle size)/D50 particle size=1) with a pore-forming agent, a binder and a sintering aid, and granulating the obtained mixed powder to obtain feed particles; wherein the feed particles comprise the following components in percentage by mass: 61wt% hollow silicon carbide microspheres, 13wt% pore-forming agent (particle size in the range of 10 μm-40 μm, specifically a mixture of carbon black powder and starch particles), 12wt% binder (specifically a mixture of polyvinyl alcohol and polystyrene), and 14wt% sintering aid (specifically solid spherical alumina powder);

(2) Placing the feeding particles into a die for dry pressing under 120MPa to obtain a ceramic matrix green body;

(3) And (3) silk-screen printing a heating body pattern on the ceramic matrix green body, sintering at 1200 ℃ for 1.5 hours to obtain an atomized core crude product, and polishing, cleaning and drying to obtain an atomized core finished product, wherein the atomized core finished product is shown in figure 1.

Example 3

A method of preparing an atomized core, differing from example 1 in that: the hollow glass microspheres of example 1 were replaced with hollow alumina microspheres having a particle size in the range of 47 μm to 62 μm and a D50 particle size of 50. Mu.m.

Example 4

A method of preparing an atomized core, differing from example 1 in that: the hollow glass microspheres of example 1 were replaced with hollow aluminum silicate microspheres having a particle size in the range of 90 μm to 120 μm and a D50 particle size of 100. Mu.m.

Example 5

A method of preparing an atomized core which differs from example 3 in that: (D90 particle size-D10 particle size)/D50 particle size=2 of the hollow alumina microspheres.

To highlight the beneficial effects of the present application, the following comparative examples 1 to 3 are now provided

Comparative example 1

An irregular solid alumina powder (particle size distribution range of 47 μm-62 μm, D50 particle size of 50 μm) was selected as a ceramic aggregate, and an atomized core was prepared according to the method described in example 1.

Comparative example 2

Hollow alumina microspheres with the particle size ranging from 10 mu m to 35 mu m are selected as ceramic aggregate, and an atomization core is prepared according to the method described in the example 1.

Comparative example 3

Hollow alumina microspheres with particle size ranging from 150 μm to 200 μm are selected as ceramic aggregate, and an atomized core is prepared according to the method described in example 1.

In order to further embody the beneficial effects of the present application, pore size distribution range, porosity and other pore characteristics of the porous ceramic matrix in the atomizing core provided in the above examples and comparative examples were tested, and mechanical properties such as crushing strength and bending strength of the atomizing core were tested. In addition, the atomization cores provided in the above examples and comparative examples were respectively loaded into cartridges of electronic cigarettes, and atomization effect on tobacco tar was observed and the corresponding oil guiding rate was recorded. The correlation results are summarized in Table 1.

The method for testing the aperture range comprises the following steps: the mercury porosimetry is adopted to test by mercury porosimetry, and the aperture range takes the minimum 10% as the lower limit and the maximum 90% as the upper limit. The porosity test method comprises the following steps: calculating the volume V of the atomizing core, and weighing the weight m of the atomizing core ₁ Placing the atomized core into pure water, vacuumizing, maintaining the vacuum state for 2min, taking out the excessive water on the surface of the sample, and weighing the weight m ₂ The porosity ρ is calculated by the following formula: ρ= (m ₂ -m ₁ ) V. The crush strength was measured using a universal mechanical tester and the load applied to the atomized core in the event of a crack was recorded (GB/T11837-2009). The flexural strength is obtained by hot-die casting the ceramic into a strip sample, sintering the sample, and then using a universal mechanical tester to record the load applied by the ceramic sample strip during fracture (GB/T6569-2006).

TABLE 1 test results for different atomizing cores

Furthermore, each cartridge is responsive to the rate of smoke generation: example 3, example 5 > example 1 > example 2 > example 4 > comparative example 2 > comparative example 1 > comparative example 3; smoke fineness: example 1, example 3 > example 5 > example 2 > example 4 > comparative example 2 > comparative example 1 > comparative example 3.

From table 1 and the above atomization results, it can be known that the oil guiding rate of the atomization core prepared by the preparation method provided by the embodiment of the application is suitable, the response speed of the atomization core for generating smoke is also suitable, and the atomization is finer; the atomizing core has high crushing strength and high bending strength.

As can be seen from the comparison between the embodiment 3 and the comparative examples 1 to 3, the atomization core according to the embodiment 3 of the present application can well satisfy all the performances, and has the advantages of fast response speed of generating smoke by heating, high smoke fineness, and almost no occurrence of frying oil and sticking core. In addition, because the solid ceramic aggregate has higher thermal conductivity and irregular morphology than the inorganic hollow microspheres, the response speed of smoke generated by the smoke bullet of the comparative example 1 is slower, the smoke fineness is deviated, and the mechanical property of the atomization core is deviated. When the particle size of the inorganic hollow microspheres is too small, the porosity of the porous ceramic matrix of comparative example 2 is too high, the mechanical properties are worst, the oil guiding speed of comparative example 2 is lower than that of example 3, but the atomization fineness is higher than that of other comparative examples. When the particle size of the inorganic hollow microspheres is too large, the pore diameter of the porous ceramic matrix of the comparative example 3 is also maximized, the oil guiding speed of the atomization core is too high, the smoke oil can not reach the required atomization temperature, and the response speed and the smoke fineness of smoke generation are worst.

The results show that the atomization core prepared by using the inorganic hollow microspheres with the particle size within the range of 40-120 μm provided by the application as ceramic aggregate can well give consideration to various atomization performances under the condition of good mechanical performance.

The above examples merely represent a few exemplary embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. A method of preparing an atomizing core, comprising the steps of:

preparing a mixed material containing inorganic hollow microspheres, a pore-forming agent and a binder; wherein, the inorganic hollow microsphere is regular sphere, has uniform particle size, basically hollow inside and no micropores on the surface; the particle size distribution range of the inorganic hollow microspheres is 40-120 mu m, and the mass percentage of the inorganic hollow microspheres in the mixed material is 40-80%;

2. The method of claim 1, wherein the inorganic hollow microspheres have a D50 particle size of 50 μm to 80 μm.

3. The method of claim 2, wherein the inorganic hollow microspheres have a particle size that: (D90 particle diameter-D10 particle diameter)/D50 particle diameter is less than or equal to 1.5.

4. The method of claim 1, wherein the inorganic hollow microspheres comprise one or more of alumina, silica, titania, silicon carbide, aluminosilicate, glass.

5. The preparation method as claimed in claim 1, wherein the mixture comprises the following components in percentage by mass: 40% -80% of the inorganic hollow microspheres, 10% -30% of the pore-forming agent, 4% -30% of the binder, 0-20% of the sintering aid and 0-5% of the surfactant.

6. The method of claim 5, wherein the sintering aid is present in the mixture in an amount of 5% to 20% by mass; the mass percentage of the surfactant in the mixed material is 0.1% -5%.

7. The method of claim 6, wherein the sintering aid is 10% -30% of the inorganic hollow microsphere by mass.

8. The method of claim 5, wherein the pore-forming agent is selected from one or more of high temperature decomposable salts, inorganic carbon materials, natural organic particles, organic microspheres;

the binder is an organic binder, and the organic binder is one or more selected from paraffin, microcrystalline wax, palm wax, sodium alginate, gelatin, polyvinyl alcohol, ethylene-vinyl acetate copolymer, polystyrene, polyethylene and polypropylene;

the sintering aid is one or more selected from glass powder, kaolin, feldspar, quartz and sodium silicate;

the surfactant is one or more selected from stearic acid, silane coupling agent, oleic acid and ethyl cellulose.

9. An atomizing core comprising a porous ceramic substrate and a heating element provided on the porous ceramic substrate, the atomizing core being produced by the production method according to any one of claims 1 to 8.

10. The atomizing core of claim 9, wherein the porous ceramic matrix has a porosity of 30% -60% and a pore size in the range of 10-100 μm.

11. An atomising core according to claim 9 or 10 wherein the crush strength of the atomising core is above 75 MPa.

12. An electronic atomizing device comprising an atomizing core as set forth in any one of claims 9-11.