CN217791478U - Atomizing core, atomizer and electronic atomization device - Google Patents

Abstract

The application discloses atomizing core, atomizer and electron atomizing device. The atomizing core comprises a porous matrix, a heating layer and a protective layer; the porous base member has the atomizing face, and the layer that generates heat sets up in the atomizing face of porous base member, and the protective layer sets up in the surface that the porous base member was kept away from on the layer that generates heat, and the protective layer includes metallic aluminum and aluminium oxide, and aluminium oxide at least part covers in metallic aluminum surface and forms the aluminium oxide layer. Through set up the protective layer on the surface that porous base member was kept away from on the layer that generates heat, can avoid the layer that generates heat on the atomizing core direct with the air contact and the oxidation inefficacy in atomizing process, influence the stability and the life of atomizing core.

Description

Atomizing core, atomizer and electronic atomization device

Technical Field

The application relates to the technical field of atomizers, in particular to an atomizing core, an atomizer and an electronic atomizing device.

Background

An electronic atomizer generally comprises an atomizer and a power supply assembly for supplying power to the atomizer, wherein the atomizer heats an aerosol-generating substrate in an energized state to generate an aerosol for a user to inhale. The atomizing core comprises a porous matrix and a heating element. Wherein, the heating atomization process of atomizer mainly generates heat under the on-state through the heating element of atomizing core to realize the heating atomization to aerosol generation substrate.

Generally, the heating element of the atomizing core is a metal heating film layer, but in the atomizing process, the heating element is easily oxidized and loses efficacy when the oil supply is insufficient, so that the stability and the service life of a product are influenced.

SUMMERY OF THE UTILITY MODEL

The application mainly provides an atomizing core, atomizer and electron atomizing device to solve the metal on the atomizing core and generate heat the rete and lose the technical problem of effect, short-lived in the atomizing in-process.

In order to solve the above technical problem, the first technical solution adopted by the present application is: an atomizing core is provided, which comprises a porous base body, a heating layer and a protective layer. The porous matrix has an atomizing surface; the heating layer is arranged on the atomizing surface of the porous matrix; the protective layer is arranged on the surface of the heating layer far away from the porous matrix; the protective layer comprises metal aluminum and aluminum oxide, wherein at least part of the aluminum oxide covers the surface of the metal aluminum and forms an aluminum oxide layer.

Wherein the metallic aluminum comprises an aluminum film layer and/or an aluminum particle morphology.

Wherein the aluminum oxide is filled between the adjacent aluminum particles, and the aluminum particles and the aluminum oxide are both in contact with the heat generating layer.

Wherein the aluminum oxide completely covers a surface of the plurality of aluminum particles not in contact with the heat generating layer.

The atomizing core further comprises two electrodes, the electrodes are arranged on the heating layer and far away from the surface of the porous base body, and the protective layer and the two electrodes jointly cover the heating layer.

Wherein the thickness of the aluminum oxide layer is 100nm-600nm;

and/or the particle size of the aluminum particles is 100nm-3 μm;

and/or the thickness of the aluminum film layer is 100nm-1 μm.

In order to solve the above technical problem, the second technical solution adopted by the present application is: there is provided a nebuliser comprising a reservoir for storing an aerosol-generating substrate and an atomising core as described in any one of the above for heat atomising the aerosol-generating substrate.

In order to solve the above technical problem, the third technical solution adopted by the present application is: there is provided an electronic atomising device comprising a power supply assembly and an atomiser as described above, the power supply assembly being arranged to provide energy to the atomiser.

The beneficial effect of this application is: be different from prior art's condition, this application discloses an atomizing core, atomizer and electronic atomization device. The atomizing core comprises a porous matrix, a heating layer and a protective layer; the porous base member has the atomizing face, and the layer that generates heat sets up in the atomizing face of porous base member, and the protective layer sets up in the surface that the porous base member was kept away from on the layer that generates heat, and the protective layer includes metallic aluminum and aluminium oxide, and aluminium oxide at least part covers in metallic aluminum surface and forms the aluminium oxide layer. The surface of keeping away from porous base member through generating heat the layer sets up the protective layer, and in the heating atomization process, the protective layer protects the layer that generates heat, avoids generating heat the layer and inefficacy because of the oxidation in the atomization process, has improved the stability on layer that generates heat, and then has improved the life on layer that generates heat.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts, wherein:

fig. 1 is a schematic structural diagram of an electronic atomization device provided in the present application;

FIG. 2 is a schematic view showing the structure of an atomizer in the electronic atomizer provided in FIG. 1;

FIG. 3 is a schematic view of the construction of a first embodiment of the atomizing core of FIG. 2;

FIG. 4 is a schematic top view of the atomizing core of FIG. 3;

FIG. 5 is a schematic view of a second embodiment of the atomizing core of FIG. 2;

FIG. 6 is a schematic structural view of another embodiment of the atomizing core of FIG. 5;

FIG. 7 is a schematic structural view of yet another embodiment of the atomizing core of FIG. 5;

FIG. 8 is a schematic flow chart diagram illustrating one embodiment of a method of making an atomizing core provided herein;

FIG. 9 is a schematic surface structure view of step S3 of the method of making an atomizing core as provided in FIG. 8;

FIG. 10 is a schematic flow chart diagram of another embodiment of a method of making an atomizing core provided herein;

fig. 11 is a schematic surface structure diagram of step S4 in the method of making an atomizing core as provided in fig. 10.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

The terms "first", "second" and "third" in the embodiments of the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to imply that the number of indicated technical features is significant. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.

Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of an electronic atomization device provided in the present application, and fig. 2 is a schematic structural diagram of an atomizer in the electronic atomization device provided in fig. 1.

Referring to fig. 1, the present application provides an electronic atomisation device 300 comprising an atomiser 100 and a power supply assembly 200, the power supply assembly 200 being arranged to provide power to the atomiser 100, the atomiser 100 being arranged to heat atomise an aerosol-generating substrate in an energised state to generate an aerosol for inhalation by a user.

Alternatively, the atomizer 100 and the power supply module 200 of the electronic atomizer 300 may be integrated into a single structure, or may be detachably connected to each other, and may be designed according to specific needs.

As shown in fig. 2, the atomizer 100 includes a liquid storage cavity 90, an air outlet pipe 30, an atomizing core 10 and an atomizing cavity 20 formed in the atomizer 100, wherein the liquid storage cavity 90 is used for storing an aerosol-generating substrate, the atomizing core 10 is used for absorbing the aerosol-generating substrate in the liquid storage cavity 90 and heating and atomizing the absorbed aerosol-generating substrate to finally generate an aerosol, and the aerosol generated by atomization flows through the air outlet pipe 30 in the atomizing cavity 20 and finally flows out of the atomizer 100 along with an external airflow to be inhaled by a user.

The heating element of the atomizing core is usually a metal heating film layer. The nano particles of the metal heating film layer are easy to oxidize and lose efficacy in the sintering and atomizing processes, and especially easy to oxidize and lose efficacy when the oil supply is insufficient. For the problem that the metal heating film layer is easy to be oxidized and failed, the technical problem is generally solved by arranging a protective layer formed by precious metals such as gold and platinum on the surface of the metal heating film layer in the prior art. However, particles of gold, platinum and the like are easy to over-burn when the aerosol generating substrate is less, so that precious metal particles are agglomerated, and the metal heating film layer is exposed to air and is oxidized and failed; moreover, the cost of the noble metal protective layer is high. In view of this, the present application provides an atomizing core 10, which is described in detail below.

Referring to fig. 3 and 4, fig. 3 is a schematic structural view of a first embodiment of the atomizing core of fig. 2, and fig. 4 is a schematic top structural view of the atomizing core of fig. 3.

The atomizing core 10 includes a porous base 11, a heat generating layer 12 and a protective layer 13, wherein the porous base 11 has an atomizing surface 111, the heat generating layer 12 is disposed on the atomizing surface 111 of the porous base 11, and the protective layer 13 is disposed on a surface of the heat generating layer 12 far away from one side of the porous base 11 and covers the heat generating layer 12. The passivation layer 13 comprises aluminum metal and aluminum oxide, wherein the aluminum oxide at least partially covers the surface of the aluminum metal and forms an aluminum oxide layer 132. Through keeping away from porous base member 11 one side at layer 12 that generates heat on the surface and set up protective layer 13, can avoid generating heat layer 12 in atomizing process and take place the oxidation with air direct contact, and generate heat layer 12 and take place the oxidation in electrode 14 sintering process, lead to generating heat layer 12 inefficacy scheduling problem to take place, the problem of the extremely easy oxidation inefficacy of metal heating film layer in electrode sintering and atomizing process among the prior art has been solved, when also having solved and using noble metal material to make the protective layer among the prior art simultaneously, when aerosol generated substrate was not enough, noble metal particle easily overburning reunion and lead to the problem that the atomizing core became invalid. Is beneficial to improving the stability of the atomizing core 10 and prolonging the service life of the atomizing core 10.

Referring to fig. 3, in the present embodiment, the protection layer 13 is disposed on a surface of the heat generating layer 12 on a side away from the porous substrate 11, and the protection layer 13 includes aluminum metal and aluminum oxide, where the aluminum metal is an aluminum film layer 130, and the aluminum film layer 130 is a continuous porous structure or a mesh structure. The aluminum oxide covers the surface of the metal aluminum and forms an aluminum oxide layer 132, the aluminum oxide layer 132 is located on the surface of the aluminum film layer 130 far away from one side of the porous matrix 11, the aluminum oxide layer 132 is high in stability and stable in chemical property, the melting point and the boiling point of the aluminum oxide layer are high, and high-temperature resistance performance is high. Meanwhile, compared with the prior art in which the protective layer 13 is made of precious metal materials such as gold and platinum, the protective layer 13 is made of metal aluminum and aluminum oxide, so that the manufacturing cost is lower, and the manufacturing cost of the atomizer 100 is effectively saved.

Specifically, the protection layer 13 is formed by oxidizing the metal aluminum deposited on the surface of the heat generating layer 12, the oxidized portion of the deposited metal aluminum forms the aluminum oxide layer 132, and the unoxidized portion forms the aluminum film layer 130. The thickness of the alumina layer 132 is in the range of 100nm-600nm, preferably 100nm-300nm, and more preferably 180nm-220nm, and in this embodiment, the thickness of the alumina layer 132 is 200nm. It can be understood that if the thickness of the aluminum oxide layer 132 is too small, the structural strength of the aluminum oxide layer will be lower, which easily results in the stability of the atomizing core 10 being reduced, and at the same time, the blocking capability of the aluminum oxide layer 132 to air or aerosol will also be weakened, i.e. the protective performance of the aluminum oxide layer 132 to the heat generating layer 12 will be weakened, and there is still a risk that the air contacts the heat generating layer 12 to cause the oxidation failure of the heat generating layer 12, and further, the stability and the service life of the atomizing core 10 will be affected. If the thickness of the alumina layer 132 is too large, the electrical resistance of the entire atomizing core 10 is greatly reduced, and the heat generation efficiency of the atomizing core 10 is affected. The thickness of the aluminum film layer 130 is 100nm-1 μm, and the thickness is related to the oxidation degree and inversely related to the thickness of the formed aluminum oxide layer 132, i.e., the thicker the aluminum oxide layer 132, the thinner the aluminum film layer 130.

The shape and size of the porous substrate 11 are not limited. The porous substrate 11 is made of a material having a porous structure, and for example, the porous substrate 11 may be made of porous ceramic, porous glass, porous plastic, porous metal, or the like. In this embodiment, the material of the porous substrate 11 is a porous ceramic substrate. The porous ceramic has pores, has the functions of guiding and storing liquid, and can enable the aerosol generating substrate in the liquid storage cavity 90 to permeate the atomizing surface 111 after being absorbed by the porous substrate 11 for heating and atomizing. Meanwhile, the porous ceramic is stable in chemical property, does not chemically react with the aerosol generating substrate, is high-temperature resistant, and cannot deform due to overhigh heating temperature in the atomization process. The porous ceramic is an insulator, and the atomizing core 10 cannot be failed due to short circuit caused by the electrical connection with the heating layer 12 on the surface of the porous ceramic, and the porous ceramic is convenient to manufacture and low in cost. In this embodiment, the porous substrate 11 is a rectangular parallelepiped porous ceramic.

In some embodiments, the porosity of the porous ceramic may be 30% to 70%. Porosity refers to the ratio of the total volume of micro-voids within a porous medium to the total volume of the porous medium. The porosity can be adjusted according to the composition of the aerosol-generating substrate, for example, when the aerosol-generating substrate has a high viscosity, a high porosity is selected to ensure drainage.

In other embodiments, the porosity of the porous ceramic may be 50% to 60%. The porosity of the porous ceramic is 50% -60%, so that on one hand, the porous ceramic has good liquid guiding efficiency, and the phenomenon that the aerosol generating substrate is not smooth to circulate and is dried is prevented, so that the atomization effect of the atomizer 100 is improved; on the other hand, the problem that the porous ceramic has too high porosity, too fast liquid guiding and difficult liquid locking, which causes great increase of liquid leakage probability and influences on the performance of the atomizer 100 can be avoided.

In other embodiments, when the porous substrate 11 is made of other materials with porous structures, the arrangement of the porosity ratio in the porous substrate 11 may be set by referring to the arrangement form on the porous ceramic, and the details are not repeated herein.

It is understood that when the porous substrate 11 is porous glass, porous plastic or porous metal, the porous glass, porous plastic or porous metal may be formed by opening pores on a dense glass substrate, plastic substrate or metal substrate.

When the porous matrix 11 is made of porous metal, an insulating layer is arranged between the porous matrix 11 and the heating layer 12, and the insulating layer is used for insulating the porous matrix 11 and the heating layer 12, so that short circuit caused by electric connection between the porous matrix 11 and the heating layer 12 is avoided.

The heat generating layer 12 is provided on the atomizing surface 111 of the porous base 11, and generates heat in an energized state to heat and atomize the aerosol-generating substrate. Alternatively, the heat generating layer 12 may be at least one of a heat generating film, a heat generating coating, a heat generating circuit, a heat generating sheet, or a heat generating mesh. In this embodiment, the layer 12 that generates heat is porous heating film structure, can understand, and the porous structure on the layer 12 that generates heat can let the more efficient surface that generates heat layer 12 or atomizing face 111 of permeating of liquid aerosol generation matrix, and then improves the drain, the heat conduction efficiency on layer 12 that generates heat, promotes the atomization effect of atomizing core 10.

The material of the heat generating layer 12 can be selected to combine with the porous substrate 11 stably, for example, the heat generating layer 12 can be made of titanium, zirconium, titanium-aluminum alloy, titanium-zirconium alloy, titanium-molybdenum alloy, titanium-niobium alloy, iron-aluminum alloy or tantalum-aluminum alloy, stainless steel, etc.

Titanium and zirconium have the following characteristics: titanium and zirconium are metals with good biocompatibility, particularly titanium is also an element which is a biological-philic metal, and the titanium and the zirconium have higher safety; titanium and zirconium have larger resistivity in metal materials, have three times of the original resistivity after being alloyed according to a certain proportion at normal temperature, and are more suitable to be materials of the heating layer 12; the titanium and zirconium have small thermal expansion coefficients, and have lower thermal expansion coefficients after alloying and better thermal matching with the porous ceramic; after alloying according to a certain proportion, the melting point of the alloy is lower, and the film forming property of the magnetron sputtering coating is better; after the metal is coated, microscopic particles of the titanium zirconium alloy are spherical through electron microscope analysis, the particles are gathered together to form a microscopic shape similar to cauliflower, and a film formed by the titanium zirconium alloy is flaky through electron microscope analysis, partial crystal boundaries among the particles disappear, and the continuity is better; the titanium and the zirconium have good plasticity and elongation, and the titanium-zirconium alloy film has better thermal cycle resistance and current impact resistance; titanium is often used as a stress buffer layer of metal and ceramic and an activating element for ceramic metallization, and titanium reacts with a ceramic interface to form a relatively strong chemical bond, so that the adhesion of the film can be improved. Based on the above characteristics of titanium and zirconium, in this embodiment, the heating layer 12 may be made of a titanium-zirconium alloy.

The thickness of the heat generating layer 12 is 0.1 μm to 10 μm. Specifically, the thickness of the heat generating layer 12 may be any one specific thickness value of 0.1 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, or 10 μm. Preferably, the thickness of the heating layer 12 is 2 μm to 5 μm, which can ensure that the thickness of the heating layer 12 matches the pore diameter of the porous matrix 11, prevent the heating layer 12 from blocking micropores for guiding and storing liquid in the porous matrix 11, improve the stability of the liquid supply in the atomization process of the atomization core 10, and prolong the service life of the atomization core.

Alternatively, the heat generating layer 12 may be prepared on the atomizing surface 111 of the porous substrate 11 by using a physical vapor deposition or chemical vapor deposition process, for example, the heat generating layer 12 may be prepared by a sputtering process, an evaporation coating process, an atomic layer deposition process, or the like. In this embodiment, the heat generating layer 12 is formed by a sputtering process.

In the present embodiment, the titanium-zirconium alloy film itself made of a titanium-zirconium alloy is a partially dense film, but since the porous substrate 11 itself has a porous structure, the titanium-zirconium alloy film formed on the surface of the porous substrate 11 also has a porous continuous structure, and the pore size distribution of the titanium-zirconium alloy film is slightly smaller than the pore size of the micropores on the surface of the porous substrate 11.

In this embodiment, as shown in fig. 3 and 4, the atomizing core 10 further includes two electrodes 14, and the two electrodes 14 are electrically connected to the power supply component 200 in the electronic atomizing device 300 respectively and are used for supplying power to the heat generating layer 12 in the atomizing core 10, so that the heat generating layer 12 generates heat in an energized state, and further heats the aerosol-generating substrate absorbed in the atomizing porous substrate 11 to generate aerosol.

Specifically, two electrodes 14 all set up in the layer 12 that generates heat and keep away from on the surface of porous base member 11 one side, and be located protective layer 13's both sides respectively, and protective layer 13 covers in the part that generates heat layer 12 is not covered by two electrodes 14, in order to guarantee that layer 12 generates heat is covered by protective layer 13 and two electrodes 14 completely, can't take place the oxidation with the air contact in atomizing process, avoided generating heat layer 12 and take place because the problem that the oxidation became invalid, thereby the stability of atomizing core 10 has been promoted, the life of atomizing core 10 has been prolonged.

Referring to fig. 5 to 7, fig. 5 is a schematic structural view of a second embodiment of the atomizing core of fig. 2, fig. 6 is a schematic structural view of another embodiment of the atomizing core of fig. 5, and fig. 7 is a schematic structural view of another embodiment of the atomizing core of fig. 5.

Referring to fig. 5, in the present embodiment, the structure of the protective layer 13 in the atomizing core 10 is different from the structure of the protective layer 13 in the first embodiment of the atomizing core 10, and the rest of the structures are the same as those in the first embodiment of the atomizing core 10, and are not described again here.

In the present embodiment, the protective layer 13 includes metallic aluminum and aluminum oxide, wherein the metallic aluminum includes a plurality of aluminum particles 131; that is, the protective layer 13 includes a plurality of aluminum particles 131 and an aluminum oxide layer 132. Specifically, the plurality of aluminum particles 131 may be a plurality of granular structures formed by agglomeration of the aluminum film layer 130 in fig. 3 after a high-temperature annealing process, and the aluminum oxide layer 132 is located on a side of the plurality of aluminum particles 131 away from the porous substrate 11. The aluminum particles 131 have a particle size ranging from 100nm to 3 μm. It is understood that the aluminum film layer 130 is agglomerated during the annealing process to form a plurality of aluminum particles 131, and the particle size of the aluminum particles 131 is larger than the thickness of the aluminum film layer 130. The aluminum particles 131 are arranged at intervals, and the aluminum oxide is filled between two adjacent aluminum particles 131, and completely covers and wraps the surfaces of the aluminum particles 131 not in contact with the heat generating layer 12, that is, the aluminum oxide layer 132 and the heat generating layer 12 wrap the aluminum particles 131 together. It can be understood that the material of the alumina layer 132 is an oxide, which has a strong oxidation resistance, and the alumina layer 132 is not easily oxidized to change its performance when contacting with air during the atomization process, thereby ensuring the stability of the atomizing core 10. Meanwhile, the compactness of the alumina layer 132 is higher, the blocking capability to the air is stronger, the alumina layer 132 completely covers and wraps the plurality of aluminum particles 131, the alumina layer 132 is filled between the two adjacent aluminum particles 131, the compactness of the protective layer 13 can be prevented from being influenced by mutual contact between the plurality of aluminum particles 131, the blocking capability of the protective layer 13 to the air is further influenced, the protective effect of the protective layer 13 to the heating layer 12 is weakened, and the risk of oxidation failure of the heating layer 12 caused by the contact of the air and the heating layer 12 still exists.

The aluminum particles 131 have good heat conductivity, and further promote the electric conductivity and the heat conductivity of the atomization core 10, so that the aluminum oxide layer 132 can also exert a certain atomization effect, and the electric conductivity and the heat conductivity of the heating layer 12 in the atomization process are also stronger, and further the atomization efficiency of the atomization core 10 is higher. A plurality of aluminium granule 131 all with the layer 12 contact that generates heat with aluminium oxide layer 132 for the associativity of layer 12 and aluminium oxide layer 132 that generates heat is better, and simultaneously, a plurality of aluminium granule 131 are the graininess, have improved the area covered of aluminium oxide layer 132 on layer 12 that generates heat, make protective layer 13 stronger to the protective effect of layer 12 that generates heat.

In addition, the aluminum particles 131 are disposed on the surface of the heat generating layer 12 and sintered with the heat generating layer 12, which is equivalent to providing spaced protrusions on the surface of the heat generating layer 12, and thus the surface area of the heat generating layer 12 and the surface area of the aluminum oxide layer 132 close to the heat generating layer 12 are increased. Simultaneously, a plurality of aluminium granule 131 protrusion in the surface of layer 12 that generates heat are favorable to promoting atomization effect, have also reduced plane stress simultaneously, have eliminated protective layer 13 cracked possibility in atomizing core 10 use, have effectively promoted atomizing core 10's life.

It can be understood that when the metallic aluminum in fig. 3 is not completely converted into the aluminum particles 131 during the high temperature annealing process, the protective layer 13 includes the aluminum film layer 130 (continuous porous structure or mesh structure) and the plurality of aluminum particles 131.

With continued reference to fig. 5, in this embodiment, the structure of the electrodes 14 is the same as that of the electrodes 14 in the first embodiment of the atomizing core 10, and the description thereof is omitted.

In another embodiment, as shown in fig. 6, the protection layer 13 is disposed on the surface of the heat generating layer 12 on the side away from the porous substrate 11, the two electrodes 14 are disposed on the surface of the protection layer 13 on the side away from the porous substrate 11 at intervals, the two electrodes 14 cover the portion of the heat generating layer 12 not covered by the protection layer 13, the two electrodes 14 are both in contact with the protection layer 13, the heat generating layer 12 and the porous substrate 11, and the two electrodes 14 are both covered on the protection layer 13 and the side of the heat generating layer 12, so as to prevent the electrodes 14 from being disposed on both sides of the protection layer 13, and a gap exists between the electrodes 14 and the protection layer 13, which cannot completely isolate the contact between air and the heat generating layer 12, resulting in failure of the atomizing core 10.

In another embodiment, as shown in fig. 7, the protection layer 13 may completely cover the surface of the heat generating layer 12 away from the porous substrate 11 and the side surface of the heat generating layer 12, that is, the protection layer 13 completely covers the heat generating layer 12 to completely isolate the heat generating layer 12 from air, two through holes (not shown) spaced from each other are formed in the protection layer 13 by opening, and the two electrodes 14 are electrically connected to the heat generating layer 12 through the two through holes in the protection layer 13, and the two electrodes 14 are exposed on the surface of the protection layer 13 away from the porous substrate 11 and electrically connected to the power module 200.

Referring to fig. 8 and 9, fig. 8 is a schematic flow chart of an embodiment of a method for manufacturing an atomizing core provided in the present application, and fig. 9 is a schematic surface structure diagram of step S3 in the method for manufacturing an atomizing core provided in fig. 8.

The preparation method of the atomizing core 10 in the present application specifically includes the following steps:

s1: and obtaining the porous matrix deposited with the heating layer.

Specifically, the porous substrate 11 is made of a material with a porous structure, and in this embodiment, the material of the porous substrate 11 is a porous ceramic substrate. In other embodiments, the porous substrate 11 may also be made of porous glass, porous plastic, porous metal, or the like.

The porous base body 11 has an atomized face 111, and the heat generating layer 12 is deposited on the atomized face 111 of the porous base body 11 to obtain the porous base body 11 on which the heat generating layer 12 is deposited. The heating layer 12 can be made of a material that is stable in combination with the porous substrate 11, for example, the heating layer 12 can be made of titanium, zirconium, titanium-aluminum alloy, titanium-zirconium alloy, titanium-molybdenum alloy, titanium-niobium alloy, iron-aluminum alloy or tantalum-aluminum alloy, stainless steel, and the like. In this embodiment, the heating layer 12 is made of a titanium-zirconium alloy. The heat generating layer 12 is prepared on the atomizing surface 111 of the porous substrate 11 by a deposition method, and can be prepared by processes such as physical vapor deposition or chemical vapor deposition, for example, the heat generating layer 12 can be prepared by process technologies such as sputtering, evaporation coating, atomic layer deposition, and the like, in this embodiment, the heat generating layer 12 is formed on the atomizing surface 111 of the porous substrate 11 by a sputtering process, and then on the surface of the heat generating layer 12 away from one side of the porous substrate 11, two electrodes 14 are respectively arranged at two ends of the heat generating layer 12, and the two electrodes 14 are arranged at intervals for electrically connecting the heat generating layer 12 and the power supply assembly 200, so as to provide energy for the atomizing core 10 formed by manufacturing.

S2: and depositing metal aluminum on the surface of the heating layer far away from the porous matrix.

Specifically, the step of depositing the metal aluminum on the surface of the heat generating layer 12 far away from the porous matrix 11 is as follows:

s21: and depositing metal aluminum with the thickness of 100nm-1 mu m on the surface of the heat generating layer 12 far away from the porous matrix 11.

The surface of the heat generating layer 12 away from the porous substrate 11 is prepared by deposition, and may be prepared by physical vapor deposition or chemical vapor deposition, for example, by sputtering, evaporation coating, atomic layer deposition, or other process techniques.

In this embodiment, the metal aluminum is prepared on the surface of the heat generating layer 12 on the side away from the porous substrate 11 by a sputtering process, before the sputtering process is performed on the heat generating layer 12, a mask is disposed on the surfaces of the two electrodes 14 away from the heat generating layer 12 to prevent the metal aluminum from being sputtered on the two electrodes 14, and after the sputtering process is completed, the mask on the two electrodes 14 is removed. After the sputtering process, on the surface of the heat generating layer 12 on the side away from the porous base 11, metallic aluminum and two electrodes 14 completely cover the surface of the heat generating layer 12 on the side away from the porous base 11, wherein the thickness of the sputtered metallic aluminum is 100nm to 1 μm.

S3: the metallic aluminum is oxidized.

Specifically, the metal aluminum is oxidized for 50min to 70min in the air atmosphere at the temperature of 400 ℃ to 700 ℃.

The metal aluminum is oxidized in an air atmosphere and in a high-temperature environment to form an aluminum film layer 130 and an aluminum oxide layer 132, and the protective layer 13 of the atomizing core 10 shown in fig. 3 is formed. Since the metallic aluminum is oxidized from the side away from the porous base 11 toward the side close to the porous base 11, the aluminum oxide layer 132 is located on the side of the aluminum membrane layer 130 away from the porous base 11. The oxidation process is carried out at the temperature of 400-700 ℃, wherein the high-temperature time in the whole oxidation process is about 50-70 min, and the overall temperature rise time and temperature reduction time is about 50-70 min. It is understood that the thickness of the aluminum oxide layer 132 generated on the surface of the metal aluminum deposited on the surface of the heat generation layer 12 is significantly related to the time of the oxidation process and the temperature of the oxidation, and specifically, the longer the oxidation time, the higher the sintering temperature, the more aluminum oxide is generated, and the greater the thickness of the aluminum oxide layer 132 is. After the oxidation process, the thickness of the aluminum oxide layer 132 is in the range of 100nm to 600nm, preferably, the thickness of the aluminum oxide layer 132 is 100nm to 300nm; more preferably, the thickness of the alumina layer 132 is between 180nm and 200nm, the atomization effect of the atomizing core 10 is stronger. In this embodiment, the thickness of the alumina layer 132 is 200nm to better protect the heat generating layer 12.

Referring to fig. 10 and 11, fig. 10 is a schematic flow chart of another embodiment of the method for manufacturing an atomizing core provided in the present application, and fig. 11 is a schematic surface structure diagram of step S4 in the method for manufacturing an atomizing core provided in fig. 10.

The method of manufacturing the atomizing core 10 provided in fig. 10 differs from the method of manufacturing the atomizing core 10 provided in fig. 8 in that: step S4 is also included after step S3.

S4: and annealing the oxidized metal aluminum.

Specifically, the oxidized metal aluminum is annealed for 6 to 24 hours at a vacuum degree of 0.01 to 100pa and a temperature of 650 to 900 ℃.

After the metal aluminum deposited on the surface of the heat generating layer 12 is oxidized, the generated aluminum oxide layer 132 and the aluminum film layer 130 are annealed in a high vacuum environment, so that the heat generating layer 12 and the aluminum oxide layer 132 can be better bonded. Specifically, the annealing process is carried out in a vacuum degree of 0.01pa to 100pa, the annealing temperature is 650 ℃ to 900 ℃, and the annealing time is 6h to 24h. After the aluminum film layer 130 and the aluminum oxide layer 132 are annealed, the aluminum film layer 130 is agglomerated at a high temperature to form a plurality of spaced aluminum particles 131, and the aluminum particles 131 have a particle size of 100nm to 3 μm, so as to form the protective layer 13 of the atomizing core 10 as shown in fig. 5. Wherein the aluminum oxide layer 132 completely covers the plurality of aluminum particles 131, and the aluminum oxide layer 132 is filled between adjacent aluminum particles 131, and both the aluminum oxide layer 132 and the plurality of aluminum particles 131 are in contact with the heat generating layer 12. The aluminum oxide layer 132 has better bonding property with the heating layer 12 after annealing, and simultaneously improves the electrical conductivity and the thermal conductivity of the heating layer 12, and the heating efficiency of the atomizing core 10. The aluminium oxide layer 132 and a plurality of aluminium granule 131 on the layer 12 surface that generates heat have constituted protective layer 13, and protective layer 13 is used for protecting layer 12 that generates heat, avoids generating heat layer 12 and air contact oxidation and inefficacy, influences atomizing core 10's stability and life. Meanwhile, the crystallinity of the heating layer 12 after annealing is higher, so that atomization is more uniform, aerosol generated by atomization is obviously increased, and the atomization efficiency of the atomization core 10 is higher. Since the metallic aluminum is converted into the aluminum oxide layer 132 and the aluminum particles 131 during the oxidation and annealing, the bonding between the aluminum oxide layer 132 and the aluminum particles 131 is stronger. Compare fig. 9 and 11, after annealing process, the crystallization degree that generates heat layer 12 is higher, and the associativity that generates heat layer 12 and protective layer 13 is better simultaneously, and atomizing core 10 atomizes more evenly, and the aerosol that generates is more, and atomization efficiency is higher.

It will be appreciated that the two electrodes 14 may also be provided after the oxidation and annealing process of the metallic aluminium. For example, two masks spaced apart from each other may be disposed on the surface of the heat generating layer 12 remote from the porous base 11 at positions at both ends before depositing aluminum metal on the surface of the heat generating layer 12 remote from the porous base 11, aluminum metal may be deposited on the portion of the surface of the heat generating layer 12 where no mask is disposed, the masks may then be removed, and after subjecting the aluminum metal to the oxidation and annealing processes, the two electrodes 14 may be disposed at the positions where the masks are removed to be electrically connected to the heat generating layer 12 and the power supply module 200. Alternatively, instead of providing a mask on the surface of the heat generating layer 12, metal aluminum may be directly deposited on the surface of the heat generating layer 12 away from the porous substrate 11, so that the metal aluminum completely covers the surface of the heat generating layer 12, and then the metal aluminum is oxidized and annealed to form a stable protection layer 13, and then two through holes spaced from each other are provided on the protection layer 13 in an open manner, the two electrodes 14 penetrate through the through holes in the protection layer 13 to be electrically connected with the heat generating layer 12, and the two electrodes 14 are both exposed on the surface of the protection layer 13 away from the porous substrate 11, so as to ensure stable electrical connection with the power module 200.

In this embodiment, by the above preparation method of the atomizing core 10, the problem that the atomizing core 10 fails due to oxidation failure of the atomizing core 10 and agglomeration of noble metal particles can be effectively avoided, which is beneficial to improving the stability and the service life of the atomizing core 10.

Be different from prior art's condition, this application discloses an atomizing core, atomizer and electronic atomization device. The atomizing core comprises a porous matrix, a heating layer and a protective layer; the porous base member has the atomizing face, and the layer that generates heat sets up in the atomizing face of porous base member, and the protective layer sets up in the surface that the porous base member was kept away from on the layer that generates heat, and the protective layer includes metallic aluminum and aluminium oxide, and aluminium oxide at least part covers in metallic aluminum surface and forms the aluminium oxide layer. Through the protective layer that the porous base member was kept away from on the surface to the layer that generates heat and constitute by metallic aluminum and aluminium oxide, can avoid the layer that generates heat on the atomizing core direct and air contact and oxidation inefficacy in atomizing process, influence the stability and the life of atomizing core, and simultaneously, when also having solved among the prior art with the protective layer on noble metal material as the layer that generates heat, when aerosol generation matrix is not enough in the atomizing core, the problem that the atomizing core that leads to is lost efficacy is got together in the overburning of noble metal particle, the manufacturing cost of atomizing core has been reduced.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings, or which are directly or indirectly applied to other related technical fields, are intended to be included within the scope of the present application.

Claims (8)

1. An atomizing core, comprising:

a porous matrix having an atomizing surface;

the heating layer is arranged on the atomizing surface of the porous matrix;

the protective layer is arranged on the surface of the heating layer, which is far away from the porous matrix; the protective layer comprises metal aluminum and aluminum oxide, wherein at least part of the aluminum oxide covers the surface of the metal aluminum and forms an aluminum oxide layer.

2. The atomizing core of claim 1, wherein the metallic aluminum comprises an aluminum film layer and/or an aluminum particle morphology.

3. The atomizing core according to claim 2, wherein the aluminum oxide is filled between the adjacent aluminum particles, and the plurality of aluminum particles and the aluminum oxide are both in contact with the heat generating layer.

4. The atomizing core of claim 2, wherein the aluminum oxide completely covers a surface of the plurality of aluminum particles that is not in contact with the heat-generating layer.

5. The atomizing core according to claim 1, characterized in that, the atomizing core further includes two electrodes, the electrodes are arranged on the surface of the heat-generating layer far away from the porous base body, and the protective layer and the two electrodes jointly cover the heat-generating layer.

6. The atomizing core of claim 2, wherein the aluminum oxide layer has a thickness of 100nm to 600nm;

and/or the particle size of the aluminum particles is 100nm-3 μm;

and/or the thickness of the aluminum film layer is 100nm-1 μm.

7. A nebulizer comprising a reservoir for storing an aerosol-generating substrate and a nebulizing cartridge according to any of claims 1 to 6 for heated nebulization of the aerosol-generating substrate.

8. An electronic atomisation device comprising a power supply and an atomiser as claimed in claim 7, the power supply being arranged to provide power to the atomiser.

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