WO2024027354A1 - 雾化芯、雾化器、气溶胶发生装置及雾化芯制备方法 - Google Patents

雾化芯、雾化器、气溶胶发生装置及雾化芯制备方法 Download PDF

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Publication number
WO2024027354A1
WO2024027354A1 PCT/CN2023/100881 CN2023100881W WO2024027354A1 WO 2024027354 A1 WO2024027354 A1 WO 2024027354A1 CN 2023100881 W CN2023100881 W CN 2023100881W WO 2024027354 A1 WO2024027354 A1 WO 2024027354A1
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WIPO (PCT)
Prior art keywords
porous
heating layer
atomization
aerosol
matrix
Prior art date
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PCT/CN2023/100881
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English (en)
French (fr)
Inventor
邱伟华
Original Assignee
常州市派腾电子技术服务有限公司
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Priority claimed from CN202222050407.8U external-priority patent/CN218681990U/zh
Priority claimed from CN202210934230.XA external-priority patent/CN117547062A/zh
Application filed by 常州市派腾电子技术服务有限公司 filed Critical 常州市派腾电子技术服务有限公司
Publication of WO2024027354A1 publication Critical patent/WO2024027354A1/zh

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Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A24F40/46—Shape or structure of electric heating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/08—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding porous substances

Definitions

  • the invention belongs to the field of atomization technology, and in particular, relates to an atomization core, an atomizer, an aerosol generating device and an atomization core preparation method.
  • the ceramic atomizing core used in the aerosol generating device usually forms a dense heating film on the atomizing surface of the porous ceramic through a thick film printing process.
  • the aerosol-forming matrix on the atomizing surface is heated through the heating film.
  • the aerosol-forming matrix is atomized to form an aerosol.
  • the thickness of the heating film in ceramic atomizer cores prepared by thick film printing technology generally does not exceed tens of microns. Not only does it have defects such as thin thickness and uneven thickness distribution, it also results in poor consistency in the resistance value of the heating film and is prone to localized The phenomenon of burning out, and the dense heating film also has the problem of small specific surface area, resulting in low atomization efficiency of the atomizing core.
  • one of the purposes of the embodiments of the present invention is to provide an atomizing core to solve the problem of atomization caused by the small specific surface area of the heating film formed by the thick film printing process in the prior art.
  • the problem of low atomization efficiency of the core is to provide an atomizing core to solve the problem of atomization caused by the small specific surface area of the heating film formed by the thick film printing process in the prior art.
  • an atomizing core including:
  • a porous matrix is used to store and transport the aerosol-forming matrix, and the surface of the porous matrix is formed with a first atomization surface for heating and atomizing the aerosol-forming matrix;
  • a heating layer used to heat and atomize the aerosol to form a substrate after being powered on, and the heating layer is provided on the surface of the porous substrate having the first atomization surface;
  • the heating layer is a porous heating layer formed on the porous substrate, the thickness of the porous heating layer is 0.2-0.8 mm, the pore diameter of the porous heating layer is 10-30 ⁇ m, and the porous heating layer
  • the aerosol-forming matrix on the porous substrate can be adsorbed, and the porous heating layer can transport the adsorbed aerosol-forming matrix to the surface of the porous heating layer, so that the surface of the porous heating layer forms a
  • the aerosol forms a second atomization surface where the matrix is heated and atomized.
  • the porous heating layer has a porosity of 40% to 60%.
  • the porous heating layer is arranged on the surface of the porous substrate in an S-shaped structure or a C-shaped structure; or, the porous heating layer is arranged on the porous substrate in a concentric annular structure or a concentric arc-shaped structure. on the surface; or, the porous heating layer is provided with at least one hollow structure among circular through holes, rectangular through holes, oval through holes, diamond through holes, pentagram through holes and hole-like patterns, So that the surface of the porous matrix can define the first atomization surface within the area defined by the hollow structure.
  • a liquid storage tank is recessed at one end of the porous substrate away from the first atomization surface, and the notch of the liquid storage tank is used to communicate with the liquid storage chamber of the atomizer.
  • the second object of the embodiments of the present invention is to provide an atomizer having the atomization core provided by any of the above-mentioned solutions.
  • the technical solution adopted by the present invention is to provide an atomizer, including the atomizing core provided by any of the above solutions.
  • the third object of the embodiments of the present invention is to provide an aerosol generating device having an atomizing core or an atomizer provided by any of the above solutions.
  • the technical solution adopted by the present invention is to provide an aerosol generating device, including the atomizing core or the atomizer provided by any of the above solutions.
  • a porous heating layer with micropores is formed on the porous substrate, and the micropores of the porous heating layer can absorb it.
  • the aerosol-forming matrix is transported to the surface of the porous heat-generating layer.
  • the outer surface of the porous heating layer can form a second atomization surface, in addition to the support for the porous heating layer.
  • Increasing the thickness of the thermal layer can effectively increase the surface area of the porous heating layer for atomizing the aerosol-forming matrix, thereby achieving the effect of increasing the atomization area of the atomizing core, which is beneficial to improving the atomization of the atomizing core. efficiency.
  • the inner surface area of the porous heating layer can be increased, so that while the micropores of the porous heating layer transmit aerosols to form the matrix, the inner wall surface of the micropores of the porous heating layer can also
  • the aerosol-forming substrate is heated and atomized to effectively increase the internal surface area of the porous heating layer for atomizing the aerosol-forming substrate, thereby increasing the specific surface area of the porous heating layer for heating and atomizing the aerosol-forming substrate, thereby effectively increasing the The atomization efficiency of the atomizer core.
  • the fourth object of the embodiments of the present invention is to provide a method for preparing an atomizing core.
  • the technical solution adopted by the present invention is to provide a method for preparing an atomizing core, which includes the following steps:
  • Step S01 Ball mill and mix metal powder, burning aid and pore-forming agent to obtain metal premix
  • Step S02 Put the metal premix and organic molding agent into an internal mixer for internal mixing to obtain internal mixing blocks;
  • Step S03 Granulate the internal mixing material block through a granulator to obtain injection molding pellets
  • Step S04 Put the injection molding pellets into an injection machine, and form a metal body on the porous matrix through a metal powder injection molding process;
  • Step S05 Pre-sinter the metal body to eliminate pore-forming agents and organic molding agents contained in the metal body;
  • Step S06 Vacuum sintering the pre-sintered metal body to obtain a finished atomization core in which the porous metal layer and the porous matrix are integrated into one body.
  • step S01 in terms of mass percentage, the mass of the metal powder is divided into 50% to 60%, the mass of the sintering aid is divided into 18% to 21%, and the mass of the pore-forming agent is Divided into 20 ⁇ 29%.
  • the metal powder is at least one of gold, silver, palladium, platinum and nickel-chromium alloy.
  • the sintering aid is at least one of glass powder, kaolin, albite and potassium feldspar.
  • the atomization core preparation method in the embodiment of the present invention adopts a metal powder injection molding process to mold the metal premix on the porous matrix, and vacuum sinters the porous matrix with the metal body to form porous heat generators on the porous matrix.
  • the porous heating layer can adsorb the aerosol on the porous substrate to form a matrix, and the porous heating layer can transport the adsorbed aerosol to form the matrix to the surface of the porous heating layer.
  • the atomization core preparation method in the embodiment of the present invention facilitates coordinated regulation of the thickness and pore size of the porous heating layer.
  • the porous heating layer While increasing the outer surface area of the porous heating layer, it can simultaneously increase the inner surface area of the porous heating layer, thereby effectively increasing the
  • the porous heating layer provides a specific surface area for the aerosol-forming matrix to be heated and atomized, thereby effectively improving the atomization efficiency of the atomizing core and increasing the amount of aerosol generated by atomizing the atomizing core.
  • Figure 1 is a schematic three-dimensional structural diagram of an atomizing core provided by an embodiment of the present invention.
  • Figure 2 is a top view of the atomizing core shown in Figure 1;
  • Figure 3 is a schematic cross-sectional structural diagram along line A-A in Figure 1;
  • Figure 4 is another three-dimensional structural schematic diagram of the atomizing core shown in Figure 1;
  • Figure 5 is an exploded view of the atomizing core shown in Figure 1
  • Figure 6 is a top view of an atomizing core provided by another embodiment of the present invention.
  • connection should be understood in a broad sense.
  • connection can be a fixed connection or a detachable connection.
  • Connection, or integral connection can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interaction between two elements.
  • connection or integral connection
  • connection, or integral connection can be a mechanical connection or an electrical connection
  • it can be a direct connection or an indirect connection through an intermediate medium
  • it can be an internal connection between two elements or an interaction between two elements.
  • the atomizing core provided by the embodiment of the present invention is used in an atomizer. It can generate heat under the electric drive of the power supply device of the aerosol generating device, and heat and atomize the aerosol-forming matrix in the liquid storage chamber of the atomizer to form aerosol. Sol, the aerosol-forming matrix is atomized to form an aerosol that can be inhaled by the user.
  • the atomization core provided by the embodiment of the present invention includes a porous substrate 1 and a heating layer 2.
  • the surface of the porous substrate 1 is formed with a first layer for heating and atomizing the aerosol-forming substrate.
  • the first atomization surface 3 is formed on the surface of the porous matrix 1, which means that the first atomization surface 3 is formed on at least part of the outer surface of the porous matrix 1, that is, one outer surface or multiple outer surfaces of the porous matrix 1.
  • a first atomization surface 3 is formed.
  • the above-mentioned at least part of the outer surface may also refer to the situation where the first atomization surface 3 is formed on part of the outer surface of one side of the porous substrate 1 , that is, the area of the first atomization surface 3 is smaller than the area of the outer surface on that side.
  • the interior of the porous matrix 1 and/or the surface of the porous matrix 1 has micropores with capillary adsorption.
  • the porous matrix 1 can adsorb and store aerosols through the micropores to form a matrix, and the aerosols adsorbed and stored by the porous matrix 1 can form a matrix through micropores.
  • the holes are continuously transmitted to the first atomization surface 3 and the heating layer 2.
  • porous substrate 1 may be, but is not limited to, porous ceramics, porous glass, porous plastics, porous fibers, or porous metals.
  • the porosity range of the porous ceramic may be, but is not limited to, 40% to 75%, and the pore size of the micropores of the porous ceramic may be, but is not limited to, 12-120 ⁇ m.
  • the heating layer 2 is disposed on the surface of the porous substrate 1 with the first atomization surface 3, and the heating layer 2 is formed on the porous substrate 1 through a metal powder injection molding process.
  • the porous heating layer can adsorb the aerosol on the porous substrate 1 to form a matrix, and the porous heating layer can transport the adsorbed aerosol to form the matrix to the surface of the porous heating layer.
  • porous heating layer The heat generated after electricity can heat and atomize the aerosol-forming substrate transferred to the surface of the porous heating layer, so that the surface of the porous heating layer forms a second atomization surface 4 for heating and atomizing the aerosol-forming substrate. .
  • the heating layer 2 is a porous heating layer, on the basis of the first atomization surface 3 formed on the surface of the porous substrate 1, the second atomization surface 4 can be formed on the surface of the porous heating layer, and the internal pore space of the porous heating layer can also be formed. It can realize heating and atomization of the aerosol-forming substrate, and increases the specific surface area of the aerosol-forming substrate that can be heated and atomized, thereby effectively improving the atomization efficiency of the atomizing core.
  • the heating layer 2 is a porous heating layer formed on the porous substrate 1 through a metal powder injection molding process, it can ensure that the pores of the porous heating layer have good uniformity, reduce production costs, and improve product yield.
  • the thickness of the porous heating layer is 0.2 to 0.8 mm, so that the thickness of the porous heating layer can be thickened, which can effectively increase the thickness of the porous heating layer.
  • the external area of the porous heating layer that atomizes the aerosol-forming matrix.
  • the thickness of the porous heating layer is 0.2 to 0.8 mm, compared to a heating film with a thin layer structure of several tens of microns, it is easier to control the uniformity and stability of the thickness distribution of the porous heating layer, making the resistance of the porous heating layer
  • the resistance value has good consistency to avoid local burning of the porous heating layer caused by poor consistency in resistance value.
  • the thickness of the porous heating layer determines the resistance value of the porous heating layer. The thinner the porous heating layer, the greater the resistance value. The thicker the porous heating layer, the greater the resistance value. Small, so the resistance value of the porous heating layer can be adjusted by adjusting and controlling the thickness of the porous heating layer.
  • the porous heating layer of the thin-layer structure is relatively loose and has poor continuity. , affecting the stability of the resistance value of the porous heating layer, which is easily oxidized or carbonized at high temperatures.
  • the thicker the porous heating layer the continuity and density of the thin-layer porous heating layer will also increase, which greatly enhances the anti-oxidation or carbonization ability of the porous heating layer, thereby enhancing the resistance of the porous heating layer. stability.
  • the thickness of the porous heating layer is too thick, that is, when the thickness of the porous heating layer is greater than 0.8mm, on the one hand, it takes a long time to form the porous heating layer, which greatly reduces the production efficiency; on the other hand, the porous heating layer The greater the stress on the layer, the microstructure of the porous heating layer will be destroyed during the use of electricity, affecting the porous heating layer. Stability of thermal layer resistance value. And considering that the resistance of the porous heating layer is too low, there is a safety risk of short circuit overload in the porous heating layer, and the resistance of the porous heating layer is too high, there is the problem of not reaching the required heating power, so the common resistance of the porous heating layer is 0.6 ⁇ 2 ⁇ .
  • the porous heating layer may be, but is not limited to, a nickel-chromium alloy layer with micropores, and the mass ratio of Ni/(Ni+Cr) in the nickel-chromium alloy layer is 0.2 to 0.9.
  • the present invention considers the influence of the thickness of the porous heating layer on the stability of the resistance of the porous heating layer and the internal and external areas of the porous heating layer, and considers the positive correlation between the thickness of the porous heating layer and the formation time, and combines the common resistance of the porous heating layer.
  • the porous heating layer is a nickel-chromium alloy layer, and the thickness of the nickel-chromium alloy layer is set to 0.2-0.8mm, so that the resistance stability of the porous heating layer is improved, and the resistance of the porous heating layer is within the common resistance Within the range, and the formation time of the porous heating layer is moderate, thereby improving the resistance stability of the atomizing core, the heating power of the atomizing core is larger, the atomizing effect of the atomizing core is good, and the manufacturing cost of the atomizing core is controllable.
  • the pore diameter of the porous heating layer is 10 to 30 ⁇ m, so that the porous heating layer has good liquid storage and liquid conduction properties, and at the same time has It is beneficial to increase the inner surface area of the heating layer 2. Since the size of the micropores of the porous heating layer determines the infusion capability of the porous heating layer, the larger the micropore diameter of the porous heating layer, the better the performance of the porous heating layer in transmitting aerosol to form a matrix.
  • the transmission speed of the porous heating layer to form a matrix will be significantly slowed down, which is not conducive to the improvement of atomization efficiency. Reducing the amount of aerosol generated.
  • the inner surface area of the porous heating layer can be increased, so that while the micropores of the porous heating layer transmit the aerosol-forming matrix, the inner wall surface of the micropores of the porous heating layer can also transmit the aerosol-forming matrix.
  • Heating and atomizing can effectively increase the internal surface area of the porous heating layer for atomizing the aerosol-forming substrate, thereby increasing the specific surface area of the porous heating layer for heating and atomizing the aerosol-forming substrate, thereby effectively improving the atomization of the atomizing core. efficiency.
  • the micropore diameter of the porous heating layer is too large, when the micropore diameter of the porous heating layer is greater than 30 ⁇ m, the transmission of aerosol-forming matrix will easily occur. If the speed is too fast, the aerosol-forming matrix cannot be fully atomized by the heat generated by the porous heating layer to form aerosol, which will cause the atomization core to explode and affect the taste of the aerosol for users.
  • the atomization core formed by the embodiment of the present invention forms a porous heating layer with micropores on the porous substrate 1.
  • the micropores of the porous heating layer can transfer the adsorbed aerosol to form a matrix.
  • the surface of the heating layer on the basis of forming the first atomization surface 3 on the surface of the porous substrate 1, the second atomization surface 4 can be formed on the outer surface of the porous heating layer.
  • the porous heating layer by increasing the thickness of the porous heating layer, it can It effectively increases the surface area of the porous heating layer that atomizes the aerosol-forming matrix, thereby achieving the effect of increasing the atomization area of the atomization core, which is beneficial to improving the atomization efficiency of the atomization core.
  • the inner surface area of the porous heating layer can be increased, so that while the micropores of the porous heating layer transmit aerosols to form the matrix, the inner wall surface of the micropores of the porous heating layer can also
  • the aerosol-forming substrate is heated and atomized to effectively increase the internal surface area of the porous heating layer for atomizing the aerosol-forming substrate, thereby increasing the specific surface area of the porous heating layer for heating and atomizing the aerosol-forming substrate, thereby effectively increasing the The atomization efficiency of the atomizer core.
  • the porosity of the porous heating layer is 40 to 60%, so that the porous heating layer has good liquid storage and liquid conduction properties. At the same time, it is beneficial to increase the specific surface area of the heating layer 2. Since the porosity of the porous heating layer determines the liquid storage and liquid conduction properties of the porous heating layer, the greater the porosity of the porous heating layer, the better the liquid storage and liquid conduction properties of the porous heating layer.
  • the porosity of the porous heating layer is less than 40%, the transmission speed of the aerosol-forming matrix of the porous heating layer will be significantly slowed down, and the amount of the aerosol-forming matrix stored in the porous heating layer is insufficient, which is not conducive to the improvement of atomization efficiency. As a result, the amount of aerosol generated by the atomization core is reduced.
  • the porosity of the porous heating layer is greater than 60%, the strength of the porous heating layer will be significantly reduced, and the density of the porous heating layer will also be reduced, thereby reducing the pressure resistance, oxidation resistance or carbonization resistance of the porous heating layer. The ability is greatly reduced, thereby easily reducing the stability of the resistance of the porous heating layer.
  • the resistance value of the porous heating layer is 0.6-1.2 ⁇ , so that the porous heating layer has appropriate atomization efficiency and good atomization effect on the aerosol-forming substrate, which can avoid excessive atomization power and The phenomenon of dry burning and carbonization can occur, and the phenomenon of insufficient atomization caused by too small atomization power can be avoided. elephant. Since the resistance value of the porous heating layer determines the heating power of the porous heating layer, the greater the resistance value of the porous heating layer, the greater the heating power of the porous heating layer.
  • the resistance value of the porous heating layer is less than 0.6 ⁇ , the heating power of the porous heating layer is too small, and the atomization power is insufficient and it is difficult to fully atomize the aerosol-forming substrate, which affects the mist effect of the porous heating layer on the aerosol-forming substrate. efficiency and atomization effect.
  • the resistance value of the porous heating layer is greater than 1.2 ⁇ , the heating power of the porous heating layer is too large and a higher temperature is generated, which easily causes dry burning and carbon deposition in the porous heating layer.
  • the porous heating layer is arranged in an S-shaped structure on the surface of the porous substrate 1.
  • it can ensure that the porous heating layer can heat the aerosol-forming matrix.
  • the larger effective area is beneficial to improving the atomization efficiency.
  • the heat generated after the porous heating layer is energized can be evenly distributed on the surface of the porous substrate 1, which is beneficial to the uniform heating of the aerosol-forming substrate and improves the atomization effect.
  • the porous heating layer can also be in a C shape.
  • the structure is arranged on the surface of the porous substrate 1, and the porous heating layer can also be arranged on the surface of the porous substrate 1 in a concentric ring-shaped structure or a concentric arc-shaped structure.
  • the porous heating layer in order to ensure that the effective area of the porous heating layer that can heat the aerosol-forming substrate is larger, and to ensure that the heat generated after the porous heating layer is energized can be evenly distributed on the surface of the porous substrate 1 , the porous heating layer can also be provided with at least one hollow structure 6 among circular through holes, rectangular through holes, oval through holes, diamond through holes, pentagram through holes and hole patterns, so that the porous substrate 1 The surface can define the first atomization surface 3 within the area defined by the hollow structure 6 .
  • the hollow structure 6 of the porous heating layer can be, but is not limited to, the above-mentioned circular through holes, rectangular through holes, oval through holes, diamond through holes, pentagram through holes and hole patterns.
  • the specific shape of the hollow structure 6 is the same as The size can be selected and set according to actual needs, and is not limited here.
  • a liquid storage tank 5 is recessed at one end of the porous substrate 1 away from the first atomization surface 3. It is only necessary to connect the slot of the liquid storage tank 5 with the atomization surface.
  • part of the aerosol-forming substrate can be stored in the liquid storage tank 5, thereby shortening the liquid conduction distance of the aerosol-forming substrate to the first atomization surface 3 and/or the porous heating layer, thereby being able to First atomization surface 3 and/ Or the porous heating layer can quickly and stably provide enough aerosol-forming matrix to prevent the atomizing core from atomizing and consuming the aerosol-forming matrix too quickly and causing dry burning and carbon deposition.
  • the atomizing core also includes two electrodes for electrically connecting an external power supply to the heating layer 2.
  • the electrodes are provided on the porous substrate 1.
  • the two electrodes are electrically connected to the heating layer 2 respectively.
  • the porous substrate 1 is also provided with blind holes 7 for storing the aerosol-forming substrate.
  • the blind holes 7 are positioned corresponding to the heating layer 2 . , so that the minimum distance from the liquid absorption surface of the porous matrix 1 to the bottom surface of the blind hole 7 is smaller than the minimum distance from the liquid absorption surface of the porous matrix 1 to the heating layer 2 .
  • the blind hole 7 may be, but is not limited to, a circular hole or a rectangular hole.
  • the surface of the porous body except the first atomization surface 3 is formed with a liquid suction surface.
  • the micropores on the liquid suction surface can transfer the aerosol-forming matrix in the liquid storage chamber of the atomizer to the internal micropores of the porous matrix 1. hole.
  • a blind hole 7 is added to the porous substrate 1 at a position corresponding to the heating layer 2, the minimum distance from the liquid absorption surface of the porous substrate 1 to the bottom surface of the blind hole 7 is smaller than the distance from the liquid absorption surface of the porous substrate 1 to the heating layer.
  • the minimum distance of layer 2, thereby making the rate at which the liquid-absorbing surface of the porous matrix 1 transmits the aerosol-forming matrix to the blind hole 7 is greater than the rate at which the liquid-absorbing surface of the porous matrix 1 transmits the aerosol-forming matrix to the heating layer 2, shortening the aerosol-forming matrix transmission.
  • the liquid conduction distance to the heating layer 2 has a relatively high liquid conduction rate relative to the area on the porous substrate 1 that is not provided with blind holes 7. At the same time, the capillary action of the blind holes 7 is used to store and transmit the aerosol-forming matrix.
  • the above-mentioned blind holes 7 are capillary structures capable of absorbing, storing, and conducting liquid, and multiple capillary structures are generally distributed in a porous structure at positions corresponding to the heating layer 2 on the porous substrate 1 and can be heating layers. 2 Provide sufficient aerosol-forming matrix quickly and stably. Please further refer to FIGS. 3 and 5 .
  • the minimum distance from the liquid storage tank 5 to the bottom surface of the blind hole 7 is less than the minimum distance from the liquid storage tank 5 to the heating layer 2 , and the blind hole 7 can be passed through.
  • the liquid conduction distance of the aerosol-forming substrate transmitted to the heating layer 2 is shortened, and the rate of transmitting the aerosol-forming substrate to the heating layer 2 can be increased through the blind holes 7 .
  • the liquid-absorbing surface of the porous matrix 1 can be any outer surface or outer side of the porous matrix 1. The outer surface or outer side does not include the first atomization surface 3 on the porous base 1 and the part of the outer surface of the porous base 1 covered by the heating layer 2 .
  • An embodiment of the present invention also provides an atomizer, which includes the atomizing core provided in any of the above embodiments. Since the atomizer has all the technical features of the atomization core provided by any of the above embodiments, it has the same technical effects as the atomization core.
  • An embodiment of the present invention also provides an aerosol generating device.
  • the aerosol generating device includes the atomizing core provided in any of the above embodiments or the atomizer provided in any of the above embodiments. Since the aerosol generating device has all the technical features of the atomizing core or atomizer provided in any of the above embodiments, it has the same technical effects as the atomizing core.
  • a method for preparing an atomizer core which is characterized by including the following steps:
  • Step S01 Ball mill and mix metal powder, burning aid and pore-forming agent to obtain metal premix
  • Step S02 Put the metal premix and organic molding agent into an internal mixer for internal mixing to obtain internal mixing blocks;
  • Step S03 Granulate the internal mixing material block through a granulator to obtain injection molding pellets
  • Step S04 Put the injection pellets into the injection machine, and form a metal body on the porous matrix 1 through a metal powder injection molding process;
  • Step S05 Pre-sinter the metal body to eliminate the pore-forming agent and organic molding agent contained in the metal body;
  • Step S06 Vacuum sintering the pre-sintered metal body to obtain a finished atomization core in which the porous metal layer and the porous matrix 1 are integrated into one body.
  • the atomization core preparation method provided by the embodiment of the present invention adopts a metal powder injection molding process to mold the metal premix on the porous matrix 1, and vacuum sinters the porous matrix 1 with the metal body.
  • a porous heating layer can be formed on the porous substrate 1.
  • the porous heating layer can absorb the aerosol on the porous substrate 1 to form a matrix, and the porous heating layer can transport the adsorbed aerosol to form a matrix to the surface of the porous heating layer.
  • the atomization core preparation method in the embodiment of the present invention facilitates coordinated regulation of the thickness and pore size of the porous heating layer. While increasing the outer surface area of the porous heating layer, it can simultaneously increase the majority of the thickness and pore size of the porous heating layer.
  • the inner surface area of the porous heating layer can effectively increase the specific surface area of the porous heating layer for the aerosol-forming matrix to be heated and atomized, thereby improving the atomization efficiency of the atomizing core and increasing the amount of aerosol generated by the atomization of the atomizing core. .
  • step S01 first, the metal powder, burning aid and pore-forming agent are dried.
  • the temperature of the drying process is controlled at 110°C, and the drying time is maintained for 6 hours to fully eliminate the contaminants in the metal powder and burning aid. Moisture.
  • the raw materials of each component are weighed. In terms of mass percentage, the mass of the metal powder is divided into 50% and 60%, the mass of the burning aid is divided into 18% and 21%, and the mass of the pore-forming agent is divided into 20% and 29%.
  • the above-mentioned weighed metal powder, burning aid and pore-forming agent are respectively put into a ball mill tank, and ball milled and mixed on a roller mill to obtain a metal premix.
  • the metal powder may include but is not limited to at least one of gold, silver, palladium, platinum and nickel-chromium alloy.
  • the burning aid may include, but is not limited to, at least one of glass powder, kaolin, albite and potash feldspar.
  • the organic molding agent is at least one of stearic acid, paraffin wax and polyethylene.
  • the above-mentioned organic molding agent used as injection molding feed based on the mass fraction of the internal mixing mass being 100%, the organic molding agent includes 5% stearic acid, 25% paraffin and 6% polyethylene. Ethylene.
  • step S03 the internally mixed mass in the above-mentioned step S02 is put into a granulator for injection molding, and is granulated by the granulator to obtain injection molding pellets.
  • the porous matrix 1 is put into the injection mold, the injection pellets are put into the injection machine, and a metal body is formed on the porous matrix 1 through a metal powder injection molding process.
  • the injection molding temperature is controlled at 100-200°C, the injection molding pressure is controlled at 30-100MPa, and the injection molding time is maintained at 3-10 seconds.
  • the metal body formed on the porous substrate 1 is pre-sintered to eliminate the pore-forming agent and organic molding agent contained in the metal body and avoid the organic mixture from contaminating the metal powder during the subsequent sintering process.
  • the temperature of the pre-sintering treatment is controlled at 500-800°C, and the time of the pre-sintering treatment is 8-20 hours.
  • the pre-sintered metal body is placed in a vacuum environment or under inert gas protection. Sintering is performed in an environment to obtain a finished atomizer core in which the porous metal layer and the porous matrix 1 are integrated into one body. Among them, the sintering temperature is 600-1200°C, and the holding time is 1-3h.
  • Drying Dry the metal powder, burning aid and pore-forming agent.
  • the temperature of the drying process is controlled at 110°C, and the drying time is maintained for 6 hours to fully eliminate the moisture in the metal powder and burning aid.
  • the metal powder may include, but is not limited to, at least one of gold, silver, palladium, platinum, and nichrome.
  • the burning aid may include, but is not limited to, at least one of glass powder, kaolin, albite and potash feldspar.
  • Injection molding Put the porous matrix 1 into the injection mold, then put the injection pellets into the injection machine, and form a metal body on the porous matrix 1 through the metal powder injection molding process.
  • the injection molding temperature is controlled at 100°C
  • the injection molding pressure is controlled at 30MPa
  • the injection molding time is maintained for 3 seconds.
  • the porous heating layer prepared in Example 1 was tested.
  • the porosity was 40%, the median pore diameter was 10um, and the thickness was 0.2mm.
  • Drying Dry the metal powder, burning aid and pore-forming agent.
  • the temperature of the drying process is controlled at 110°C, and the drying time is maintained for 6 hours to fully eliminate the moisture in the metal powder and burning aid.
  • the metal powder may include but is not limited to at least one of gold, silver, palladium, platinum and nickel-chromium alloy.
  • the burning aid may include, but is not limited to, at least one of glass powder, kaolin, albite and potash feldspar.
  • Injection molding Put the porous matrix 1 into the injection mold, then put the injection pellets into the injection machine, and form a metal body on the porous matrix 1 through the metal powder injection molding process.
  • the injection molding temperature is controlled at 150°C
  • the injection molding pressure is controlled at 75MPa
  • the injection molding time is maintained for 6 seconds.
  • the metal body formed on the porous matrix 1 is pre-sintered to eliminate the pore-forming agent and organic molding agent contained in the metal body and avoid the organic mixture from being mixed in the subsequent sintering process. Contamination of the metal powder causes the resistance value of the porous heating layer formed by the metal powder to steadily deteriorate.
  • the temperature of the pre-sintering treatment is controlled at 700°C, and the time of the pre-sintering treatment is 15 hours. Then, the pre-sintered metal body is placed in a vacuum environment or an inert gas protective environment for sintering, to obtain a finished atomization core in which the porous metal layer and the porous matrix 1 are integrated. Among them, the sintering temperature is 1000°C and the holding time is 2h.
  • the porous heating layer prepared in Example 2 was tested and found that the porosity was 49%, the median pore diameter was 22um, and the thickness was 0.5mm.
  • Drying Dry the metal powder, burning aid and pore-forming agent.
  • the temperature of the drying process is controlled at 110°C, and the drying time is maintained for 6 hours to fully eliminate the moisture in the metal powder and burning aid.
  • the mass of the metal powder is divided into 60%, the mass of the sintering aid is divided into 20%, and the mass of the pore-forming agent is divided into 20%.
  • the weighed metal powder, burning aid and pore-forming agent mentioned above are respectively put into a ball mill tank, and ball milled and mixed on a roller mill to obtain a metal premix.
  • the metal powder may include but is not limited to at least one of gold, silver, palladium, platinum and nickel-chromium alloy.
  • the burning aid may include, but is not limited to, at least one of glass powder, kaolin, albite and potash feldspar.
  • Injection molding Put the porous matrix 1 into the injection mold, then put the injection pellets into the injection machine, and form a metal body on the porous matrix 1 through the metal powder injection molding process.
  • the injection molding temperature is controlled at 100-200°C
  • the injection molding pressure is controlled at 30-100MPa
  • the injection molding time is maintained at 3-10 seconds.
  • the metal body formed on the porous matrix 1 is pre-sintered to eliminate the pore-forming agent and organic molding agent contained in the metal body and avoid the organic mixture from being mixed in the subsequent sintering process. Contamination of the metal powder causes the resistance value of the porous heating layer formed by the metal powder to steadily deteriorate.
  • the temperature of the pre-sintering treatment is controlled at 500-800°C, and the time of the pre-sintering treatment is 8-20 hours. Then, the pre-sintered metal body is placed in a vacuum environment or an inert gas protective environment for sintering, to obtain a finished atomization core in which the porous metal layer and the porous matrix 1 are integrated. Among them, the sintering temperature is 600-1200°C, and the holding time is 1-3h.
  • the porous heating layer prepared in Example 3 was tested and found that the porosity was 60%, the median pore diameter was 30um, and the thickness was 0.8mm.
  • Drying Dry the metal powder, burning aid and pore-forming agent.
  • the temperature of the drying process is controlled at 110°C, and the drying time is maintained for 6 hours to fully eliminate the moisture in the metal powder and burning aid.
  • Weighing/mixing Weigh the raw materials of each component. In terms of mass percentage, the mass of the metal powder is divided into 55%, the mass of the sintering aid is divided into 21%, and the mass of the pore-forming agent is divided into 24%.
  • the above-mentioned weighed metal powder, burning aid and pore-forming agent are respectively put into a ball mill tank, and ball milled and mixed on a roller mill to obtain a metal premix.
  • the metal powder may include but is not limited to at least one of gold, silver, palladium, platinum and nickel-chromium alloy.
  • the burning aid may include, but is not limited to, at least one of glass powder, kaolin, albite and potassium feldspar.
  • Injection molding Put the porous matrix 1 into the injection mold, then put the injection pellets into the injection machine, and form a metal body on the porous matrix 1 through the metal powder injection molding process.
  • the injection molding temperature is controlled at 150°C
  • the injection molding pressure is controlled at 75MPa
  • the injection molding time is maintained for 6 seconds.
  • the metal body formed on the porous matrix 1 is pre-sintered to eliminate the pore-forming agent and organic molding agent contained in the metal body and avoid the organic mixture from being mixed in the subsequent sintering process. Contamination of the metal powder causes the resistance value of the porous heating layer formed by the metal powder to steadily deteriorate.
  • the temperature of the pre-sintering treatment is controlled at 700°C, and the time of the pre-sintering treatment is 15 hours. Then, the pre-sintered metal body is placed in a vacuum environment or an inert gas protective environment for sintering, to obtain a finished atomization core in which the porous metal layer and the porous matrix 1 are integrated. Among them, the sintering temperature is 1000°C and the holding time is 2h.
  • the porous heating layer prepared in Example 2 was tested.
  • the porosity was 50%, the median pore diameter was 23um, and the thickness was 0.5mm.
  • the aerosol volume of the atomizing core in Examples 1 to 4 after 20 puffs, 40 puffs, 60 puffs, 80 puffs, 100 puffs, 120 puffs and 140 puffs is the same as that in the comparative example.
  • the aerosol volume has been significantly improved, indicating that the aerosol volume from Embodiment 1 to Implementation
  • the atomization efficiency of the atomizing core in Example 3 is higher than that of the conventional thick film atomizing core in the comparative example.

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Abstract

一种雾化芯、雾化器、气溶胶发生装置及雾化芯制备方法，雾化芯包括多孔基体（1）和加热层（2），加热层（2）为设置于多孔基体（1）具有第一雾化面（3）的表面上的多孔发热层。雾化芯制备方法，采用金属粉末注塑成型工艺将金属预混料成型于多孔基体（1）上，将具有金属坯体的多孔基体（1）进行真空烧结，便可在多孔基体（1）上形成多孔发热层，多孔发热层可将从多孔基体（1）上吸附的气溶胶形成基质传输至多孔发热层的表面。在雾化芯使用时，可有效增大雾化芯的雾化面积，且多孔发热层的微孔内壁面也可实现对气溶胶形成基质的加热雾化，以此使得多孔发热层可有效增大可供气溶胶形成基质加热并雾化的比表面积，有利于提高雾化芯的雾化效率。

Description

雾化芯、雾化器、气溶胶发生装置及雾化芯制备方法 技术领域
本发明属于雾化技术领域，特别地，涉及一种雾化芯、雾化器、气溶胶发生装置及雾化芯制备方法。
背景技术
气溶胶发生装置使用的陶瓷雾化芯，通常是通过厚膜印刷工艺在多孔陶瓷的雾化面上形成一层致密的发热膜，通过发热膜对雾化面上的气溶胶形成基质进行加热，使气溶胶形成基质雾化形成气溶胶。当前，采用厚膜印刷工艺制备的陶瓷雾化芯，发热膜的厚度一般不超过几十微米，不仅存在厚度较薄、厚度分布不均匀等缺陷，导致发热膜的电阻值一致性差而容易产生局部烧断的现象，而且致密的发热膜还存在比表面积较小的问题，导致雾化芯的雾化效率较低。
发明内容
基于现有技术中存在的上述问题，本发明实施例的目的之一在于提供一种雾化芯，以解决现有技术中存在的厚膜印刷工艺形成的发热膜比表面积较小，导致雾化芯的雾化效率较低的问题。
为实现上述目的，本发明采用的技术方案是：提供一种雾化芯，包括：
多孔基体，用于储存及传输气溶胶形成基质，所述多孔基体的表面形成有用于供气溶胶形成基质加热雾化的第一雾化面；以及
加热层，用于在通电后加热并雾化气溶胶形成基质，所述加热层设置于所述多孔基体具有所述第一雾化面的表面上；
其中，所述加热层为形成于所述多孔基体上的多孔发热层，所述多孔发热层的厚度为0.2～0.8㎜，所述多孔发热层的孔径为10～30μm，所述多孔发热层 可吸附所述多孔基体上的气溶胶形成基质，且所述多孔发热层可将吸附的气溶胶形成基质传输至所述多孔发热层的表面，以使所述多孔发热层的表面形成用于供气溶胶形成基质加热雾化的第二雾化面。
进一步地，所述多孔发热层的孔隙率为40～60％。
进一步地，所述多孔发热层呈S型结构或C型结构布置于所述多孔基体的表面上；或者，所述多孔发热层呈同心环状结构或同心圆弧状结构布置于所述多孔基体的表面上；亦或者，所述多孔发热层上设有圆形通孔、矩形通孔、椭圆形通孔、菱形通孔、五角星形通孔和孔状图案中的至少一种镂空结构，以使所述多孔基体的表面可在所述镂空结构所限定的区域范围内界定出所述第一雾化面。
进一步地，所述多孔基体背离所述第一雾化面的一端凹设有储液槽，所述储液槽的槽口用于与所述雾化器的储液腔连通。
基于现有技术中存在的上述问题，本发明实施例的目的之二在于提供一种具有上述任一方案提供的雾化芯的雾化器。
为实现上述目的，本发明采用的技术方案是：提供一种雾化器，包括上述任一方案提供的所述雾化芯。
基于现有技术中存在的上述问题，本发明实施例的目的之三在于提供一种具有上述任一方案提供的雾化芯或雾化器的气溶胶发生装置。
为实现上述目的，本发明采用的技术方案是：提供一种气溶胶发生装置，包括上述任一方案提供的所述雾化芯或所述雾化器。
本发明实施例中的上述一个或多个技术方案，与现有技术相比，至少具有如下有益效果之一：
本发明实施例中的雾化芯、雾化器及气溶胶发生装置，雾化芯结构中，通过在多孔基体上形成具有微孔的多孔发热层，多孔发热层的微孔可将其吸附的气溶胶形成基质传输至多孔发热层的表面。则在使用时，在多孔基体表面形成第一雾化面的基础上，多孔发热层的外表面可形成第二雾化面，加上对多孔发 热层的厚度进行增厚设置，可有效增加多孔发热层对气溶胶形成基质进行雾化的外表面积，从而达到增大雾化芯的雾化面积的效果，有利于提高雾化芯的雾化效率。此外，通过对多孔发热层厚度与孔径的协同调控，可增大多孔发热层的内表面积，使得多孔发热层的微孔在传输气溶胶形成基质的同时，多孔发热层的微孔内壁面也可对气溶胶形成基质进行加热雾化，以有效增加多孔发热层对气溶胶形成基质进行雾化的内表面积，从而增加多孔发热层可供气溶胶形成基质加热并雾化的比表面积，进而有效提高雾化芯的雾化效率。
基于现有技术中存在的上述问题，本发明实施例的目的之四在于提供一种雾化芯制备方法。
为实现上述目的，本发明采用的技术方案是：提供一种雾化芯制备方法，包括如下步骤：
步骤S01：将金属粉末、助烧剂和造孔剂球磨混合，获得金属预混料；
步骤S02：将所述金属预混料与有机成型剂放入密炼机中进行密炼，获得密炼料块；
步骤S03：将所述密炼料块通过造粒机进行造粒，获得注塑造粒料；
步骤S04：将所述注塑造粒料放入注射机中，通过金属粉末注塑成型工艺在多孔基体上形成金属坯体；
步骤S05：将所述金属坯体进行预烧处理，以排除所述金属坯体中所含的造孔剂和有机成型剂；
步骤S06：将预烧处理后的所述金属坯体进行真空烧结，获得多孔金属层与多孔基体结合为一体的雾化芯成品。
可选的，所述步骤S01中，按照质量百分比计，所述金属粉末的质量分为50％～60％，所述助烧剂的质量分为18～21％，所述造孔剂的质量分为20～29％。
可选的，所述步骤S01中，所述金属粉末为金、银、钯、铂和镍铬合金中的至少一种。
可选的，所述步骤S01中，所述助烧剂为玻璃粉、高岭土、钠长石和钾长石中的至少一种。
本发明实施例中的上述一个或多个技术方案，与现有技术相比，至少具有如下有益效果之一：
本发明实施例中的雾化芯制备方法，采用金属粉末注塑成型工艺将金属预混料成型于多孔基体上，将具有金属坯体的多孔基体进行真空烧结，便可在多孔基体上形成多孔发热层，多孔发热层可吸附多孔基体上的气溶胶形成基质，且多孔发热层可将吸附的气溶胶形成基质传输至多孔发热层的表面。本发明实施例中的雾化芯制备方法，便于对多孔发热层的厚度与孔径进行协同调控，在增加多孔发热层外表面积的同时，可同步增大多孔发热层的内表面积，从而有效增大多孔发热层可供气溶胶形成基质加热并雾化的比表面积，进而有效提高雾化芯的雾化效率，增大雾化芯雾化产生的气溶胶量。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例提供的雾化芯的立体结构示意图；
图2为图1中所示的雾化芯的俯视图；
图3为图1中沿A-A线的剖视结构示意图；
图4为图1中所示的雾化芯的另一立体结构示意图；
图5为图1中所示的雾化芯的分解视图
图6为本发明另一实施例提供的雾化芯的俯视图。
其中，图中各附图标记：
1-多孔基体；2-加热层；3-第一雾化面；
4-第二雾化面；5-储液槽；6-镂空结构；7-盲孔。
具体实施方式
为了使本发明所要解决的技术问题、技术方案及有益效果更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
需要说明的是，当元件被称为“连接于”或“设置于”另一个元件，它可以直接在另一个元件上或者间接在该另一个元件上。当一个元件被称为是“连接于”另一个元件，它可以是直接连接到另一个元件或间接连接至该另一个元件上。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本发明的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。“多个”的含义是一个或一个以上，除非另有明确具体的限定。
在本发明的描述中，需要理解的是，术语“中心”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电性连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
在整个说明书中参考“一个实施例”或“实施例”意味着结合实施例描述的特定特征，结构或特性包括在本申请的至少一个实施例中。因此，“在一个实施例中”、“在一些实施例中”或“在其中一些实施例中”的短语出现在整个说明书的各个地方，并非所有的指代都是相同的实施例。此外，在一个或多个实施例中，可以以任何合适的方式组合特定的特征，结构或特性。
请一并参阅图1至6，现对本发明实施例提供的雾化芯进行说明。本发明实施例提供的雾化芯用于雾化器，其可在气溶胶发生装置的电源装置的电驱动下发热，将雾化器的储液腔中的气溶胶形成基质加热雾化形成气溶胶，由气溶胶形成基质雾化形成气溶胶可供用户吸食。
请进一步结合参阅图1、图2和图5，本发明实施例提供的雾化芯包括多孔基体1和加热层2，多孔基体1的表面形成有用于供气溶胶形成基质加热雾化的第一雾化面3。可以理解地，多孔基体1的表面形成有第一雾化面3，是指多孔基体1的至少部分外表面形成有第一雾化面3，即多孔基体1一侧外表面或多侧外表面形成有第一雾化面3。当然，上述至少部分外表面还可以指多孔基体1一侧外表面上的部分表面形成有第一雾化面3，即第一雾化面3的面积小于该侧外表面的面积的情形。多孔基体1内部和/或多孔基体1的表面具有毛细吸附作用的微孔，多孔基体1可通过微孔吸附、存储气溶胶形成基质，且多孔基体1吸附、存储的气溶胶形成基质可经由微孔持续传输至第一雾化面3和加热层2。需要说明的是，上述多孔基体1可以是但不限于多孔陶瓷、多孔玻璃、多孔塑料、多孔纤维或多孔金属等。在多孔基体1为多孔陶瓷时，多孔陶瓷的孔隙率范围可以是但不限于40％～75％，多孔陶瓷的微孔的孔径大小可以是但不限于12～120μm。
请进一步结合参阅图1、图2和图3，加热层2设置于多孔基体1具有第一雾化面3的表面上，且加热层2为通过金属粉末注塑成型工艺形成于多孔基体1上的多孔发热层，多孔发热层可吸附多孔基体1上的气溶胶形成基质，且多孔发热层可将吸附的气溶胶形成基质传输至多孔发热层的表面。多孔发热层通 电后产生热量，可将传输至多孔发热层的表面上的气溶胶形成基质进行加热并雾化，使得多孔发热层的表面形成用于供气溶胶形成基质加热雾化的第二雾化面4。这样，由于加热层2为多孔发热层，在多孔基体1表面形成第一雾化面3的基础上，多孔发热层的表面可形成第二雾化面4，且多孔发热层的内部孔隙空间也可实现对气溶胶形成基质的加热雾化，增加了可加热并雾化气溶胶形成基质的比表面积，从而有效提高雾化芯的雾化效率。此外，由于加热层2为通过金属粉末注塑成型工艺形成于多孔基体1上的多孔发热层，可以保证多孔发热层的孔隙具有良好的均匀性，降低生产成本，提高产品良率。
在其中一些实施例中，由于多孔发热层是通过金属粉末注塑成型工艺在多孔基体1上，多孔发热层的厚度为0.2～0.8㎜，以对多孔发热层的厚度进行增厚设置，可有效增加多孔发热层对气溶胶形成基质进行雾化的外表面积。此外，由于多孔发热层的厚度为0.2～0.8㎜，相对于厚度为几十微米的薄层结构的发热膜，便于对多孔发热层厚度分布均匀性与稳定性的调控，使得多孔发热层的电阻值具有良好的一致性，避免出现电阻值一致性差而导致多孔发热层产生局部烧断的情形发生。需要注意的是，根据电阻计算公式可知，多孔发热层的厚度决定了多孔发热层的电阻值大小，多孔发热层的厚度越薄时电阻值越大，多孔发热层的厚度越厚时电阻值越小，故可通过调节与控制多孔发热层的厚度以达到调节多孔发热层电阻值的目的。同时，在研发过程中，通过大量的实验发现：当多孔发热层的厚度太薄的话，也就是在多孔发热层的厚度小于0.2㎜时，薄层结构的多孔发热层比较疏松且连续性不好，影响多孔发热层电阻值的稳定性，多孔发热层比较容易被高温氧化或碳化。多孔发热层的厚度越厚，薄层结构的多孔发热层的连续性与致密性也会随之增加，使得多孔发热层的抗氧化或抗碳化的能力大幅度增强，从而增强多孔发热层电阻的稳定性。然而，当多孔发热层的厚度太厚的话，也就是在多孔发热层的厚度大于0.8㎜时，一方面，多孔发热层所需形成时间较长，从而大幅降低生产效率；另一方面，多孔发热层的应力越大，多孔发热层在通电使用过程中微观结构遭到破坏，影响多孔发 热层电阻值的稳定性。以及考虑到多孔发热层的电阻太低存在多孔发热层短路过载的安全隐患，而多孔发热层的电阻太高存在达不到所需发热功率的问题，因此多孔发热层的常用电阻为0.6～2Ω。在其中一些更具体实施例中，多孔发热层可以是但不限于具有微孔的镍铬合金层，镍铬合金层中的Ni/(Ni+Cr)质量比例为0.2～0.9。本发明考虑多孔发热层的厚度对多孔发热层电阻的稳定性以及多孔发热层内、外表面积的影响，以及考虑多孔发热层的厚度与形成时长的正向关联，并结合多孔发热层的常用电阻为0.6～2Ω，综合上述考虑，多孔发热层为镍铬合金层，镍铬合金层的厚度设置为0.2～0.8㎜，以使得多孔发热层的电阻稳定性提高，多孔发热层的电阻处于常用电阻范围内，且多孔发热层的形成时间适中，进而使得雾化芯的电阻稳定性提高，雾化芯的发热功率较大，雾化芯的雾化效果好，雾化芯的制造成本可控。
在其中一些实施例中，由于多孔发热层是通过金属粉末注塑成型工艺在多孔基体1上，多孔发热层的孔径为10～30μm，使得多孔发热层具有良好的储液和导液性能，同时有利于增加加热层2的内表面积。由于多孔发热层的微孔孔径的大小决定了多孔发热层的输液能力，多孔发热层的微孔孔径越大，多孔发热层传输气溶胶形成基质的性能越好。当多孔发热层的微孔孔径过小，也就是在多孔发热层的微孔孔径小于10μm时，会使得多孔发热层的传输气溶胶形成基质的速度明显减慢，不利于雾化效率的提高，致使产生的气溶胶的量减少。多孔发热层的微孔孔径越大，一方面气溶胶形成基质传输所遇到的阻力也会随之减小，使得多孔发热层的传输气溶胶形成基质的速率得到大幅度增强，从而有利于雾化效率的提高；另一方面可增大多孔发热层的内表面积，使得多孔发热层的微孔在传输气溶胶形成基质的同时，多孔发热层的微孔内壁面也可对气溶胶形成基质进行加热雾化，以有效增加多孔发热层对气溶胶形成基质进行雾化的内表面积，从而增加多孔发热层可供气溶胶形成基质加热并雾化的比表面积，进而有效提高雾化芯的雾化效率。然而，当多孔发热层的微孔孔径太大的话，在多孔发热层的微孔孔径大于30μm时，容易出现气溶胶形成基质的传输 速率过快，使得气溶胶形成基质不能充分被多孔发热层产生的热量雾化形成气溶胶，从而导致雾化芯发生炸液现象，影响用户吸食气溶胶的口感。
本发明实施例提供的雾化芯，与现有技术相比，通过在多孔基体1上形成具有微孔的多孔发热层，多孔发热层的微孔可将其吸附的气溶胶形成基质传输至多孔发热层的表面。则在使用时，在多孔基体1表面形成第一雾化面3的基础上，多孔发热层的外表面可形成第二雾化面4，加上对多孔发热层的厚度进行增厚设置，可有效增加多孔发热层对气溶胶形成基质进行雾化的外表面积，从而达到增大雾化芯的雾化面积的效果，有利于提高雾化芯的雾化效率。此外，通过对多孔发热层厚度与孔径的协同调控，可增大多孔发热层的内表面积，使得多孔发热层的微孔在传输气溶胶形成基质的同时，多孔发热层的微孔内壁面也可对气溶胶形成基质进行加热雾化，以有效增加多孔发热层对气溶胶形成基质进行雾化的内表面积，从而增加多孔发热层可供气溶胶形成基质加热并雾化的比表面积，进而有效提高雾化芯的雾化效率。
在其中一些实施例中，由于多孔发热层是通过金属粉末注塑成型工艺在多孔基体1上，多孔发热层的孔隙率为40～60％，使得多孔发热层具有良好的储液和导液性能，同时有利于增加加热层2的比表面积。由于多孔发热层的孔隙率大小决定了多孔发热层的储液及导液性能，多孔发热层的孔隙率越大，多孔发热层的储液及导液性能越好。当多孔发热层的孔隙率小于40％时，会使得多孔发热层的传输气溶胶形成基质的速度明显减慢，且多孔发热层储存气溶胶形成基质的量不足，不利于雾化效率的提高，致使雾化芯雾化产生的气溶胶的量减少。当多孔发热层的孔隙率大于60％时，会使得多孔发热层的强度明显降低，多孔发热层的致密性也会随之减小，从而使得多孔发热层的抗压强、抗氧化或抗碳化的能力大幅度降低，从而容易降低多孔发热层电阻的稳定性。
在其中一些实施例中，多孔发热层的电阻值为0.6～1.2Ω，使得多孔发热层对气溶胶形成基质具有合适的雾化效率和良好的雾化效果，既可避免雾化功率过大而出现干烧碳化的现象，又可避免雾化功率过小而出现雾化不充分的现 象。由于多孔发热层的电阻值决定了多孔发热层的发热功率大小，多孔发热层的电阻值越大，多孔发热层的发热功率随之越大。当多孔发热层的电阻值小于0.6Ω时，致使多孔发热层的发热功率偏小，会出现雾化功率不足而难以将气溶胶形成基质充分雾化，影响多孔发热层对气溶胶形成基质的雾化效率和雾化效果。当多孔发热层的电阻值大于1.2Ω时，致使多孔发热层的发热功率偏大而产生较高的温度，容易造成多孔发热层发生干烧积碳现象。
请进一步结合参阅图1、图2和图5，在其中一些实施例中，多孔发热层呈S型结构布置于多孔基体1的表面上，一方面可确保多孔发热层可加热气溶胶形成基质的有效面积更大，有利于提高雾化效率，另一方面可使得多孔发热层通电后产生的热量均匀分布于多孔基体1的表面，进而有利于气溶胶形成基质的均匀受热，提高雾化效果。可以理解地，为了确保多孔发热层可加热气溶胶形成基质的有效面积更大，以及确保多孔发热层通电后产生的热量能够均匀地分布于多孔基体1的表面，多孔发热层还可以呈C型结构布置于多孔基体1的表面上，多孔发热层也可以呈同心环状结构或同心圆弧状结构布置于多孔基体1的表面上。需要注意的是，在其中另一些实施例中，为了确保多孔发热层可加热气溶胶形成基质的有效面积更大，以及确保多孔发热层通电后产生的热量能够均匀地分布于多孔基体1的表面，多孔发热层上也可设有圆形通孔、矩形通孔、椭圆形通孔、菱形通孔、五角星形通孔和孔状图案中的至少一种镂空结构6，以使多孔基体1的表面可在镂空结构6所限定的区域范围内界定出第一雾化面3。当然，多孔发热层的镂空结构6可以是但不限于上述圆形通孔、矩形通孔、椭圆形通孔、菱形通孔、五角星形通孔和孔状图案，镂空结构6的具体形状与尺寸可根据实际需要而选取设置，在此不作唯一限定。
请进一步结合参阅图3和图4，在其中一些实施例中，多孔基体1背离第一雾化面3的一端凹设有储液槽5，仅需将储液槽5的槽口与雾化器的储液腔连通，就可将部分气溶胶形成基质储存于储液槽5中，缩短气溶胶形成基质传输至第一雾化面3和/或多孔发热层的导液距离，从而能够向第一雾化面3和/ 或多孔发热层快速、稳定地提供足够的气溶胶形成基质，防止雾化芯雾化消耗气溶胶形成基质速度过快而发生干烧积碳。
请进一步结合参阅图3和图4，在其中一些实施例中，雾化芯还包括用于供外部电源与加热层2电性连接的两个电极，电极设于多孔基体1上，两个电极分别与加热层2电性连接。
请进一步结合参阅图3和图5，在其中一些实施例中，多孔基体1上还设有用于储存气溶胶形成基质的盲孔7，盲孔7的设置位置与加热层2的设置位置相对应，以使多孔基体1的吸液面至盲孔7的孔底面的最小距离小于多孔基体1的吸液面至加热层2的最小距离。可以理解地，盲孔7可以是但不限于圆形孔或矩形孔。多孔体除第一位雾化面3之外的表面形成有吸液面，吸液面上的微孔可将雾化器的储液腔中的气溶胶形成基质传输至多孔基体1的内部微孔中。该实施例中，由于在多孔基体1上对应加热层2的位置增设盲孔7，使得多孔基体1的吸液面至盲孔7的孔底面的最小距离小于多孔基体1的吸液面至加热层2的最小距离，进而使得多孔基体1的吸液面向盲孔7传输气溶胶形成基质的速率大于多孔基体1的吸液面向加热层2传输气溶胶形成基质的速率，缩短气溶胶形成基质传输至加热层2的导液距离，且相对多孔基体1上未设置盲孔7的区域部分具有相对较高的导液速率，同时利用盲孔7的毛细作用对气溶胶形成基质进行储存及传输，从而能够向加热层2快速、稳定地提供足够的气溶胶形成基质，防止加热层2雾化消耗气溶胶形成基质速度过快而发生干烧积碳。需要注意的是，上述盲孔7是能够吸液、储液及导液的毛细结构，且多个毛细结构总体呈孔状结构分布于多孔基体1上对应加热层2的位置，能够为加热层2快速、稳定地提供足够的气溶胶形成基质。请进一步结合参阅图3和图5，在其中另一些实施例中，储液槽5至盲孔7的孔底面的最小距离小于储液槽5至加热层2的最小距离，可通过盲孔7缩短气溶胶形成基质传输至加热层2的导液距离，且可通过盲孔7提高向加热层2传输气溶胶形成基质的速率。需要注意的是，多孔基体1的吸液面可以是多孔基体1的任意外表面或外侧面， 该外表面或外侧面不包括多孔基体1上的第一雾化面3及多孔基体1上被加热层2所覆盖的部分外表面。
本发明实施例还提供一种雾化器，雾化器包括上述任一实施例提供的雾化芯。因雾化器具有上述任一实施例提供的雾化芯的全部技术特征，故其具有雾化芯相同的技术效果。
本发明实施例还提供一种气溶胶发生装置，气溶胶发生装置包括上述任一实施例提供的雾化芯或上述任一实施例提供的的雾化器。因气溶胶发生装置具有上述任一实施例提供的雾化芯或雾化器的全部技术特征，故其具有雾化芯相同的技术效果。
一种雾化芯制备方法，其特征在于，包括如下步骤：
步骤S01：将金属粉末、助烧剂和造孔剂球磨混合，获得金属预混料；
步骤S02：将金属预混料与有机成型剂放入密炼机中进行密炼，获得密炼料块；
步骤S03：将密炼料块通过造粒机进行造粒，获得注塑造粒料；
步骤S04：将注塑造粒料放入注射机中，通过金属粉末注塑成型工艺在多孔基体1上形成金属坯体；
步骤S05：将金属坯体进行预烧处理，以排除金属坯体中所含的造孔剂和有机成型剂；
步骤S06：将预烧处理后的金属坯体进行真空烧结，获得多孔金属层与多孔基体1结合为一体的雾化芯成品。
本发明实施例提供的雾化芯制备方法，与现有技术相比，采用金属粉末注塑成型工艺将金属预混料成型于多孔基体1上，将具有金属坯体的多孔基体1进行真空烧结，便可在多孔基体1上形成多孔发热层，多孔发热层可吸附多孔基体1上的气溶胶形成基质，且多孔发热层可将吸附的气溶胶形成基质传输至多孔发热层的表面。本发明实施例中的雾化芯制备方法，便于对多孔发热层的厚度与孔径进行协同调控，在增加多孔发热层外表面积的同时，可同步增大多 孔发热层的内表面积，从而有效增大多孔发热层可供气溶胶形成基质加热并雾化的比表面积，进而提高雾化芯的雾化效率，增大雾化芯雾化产生的气溶胶量。
上述步骤S01中，首先，将金属粉末、助烧剂和造孔剂进行干燥处理，干燥处理的温度控制在110℃，干燥处理的时间保持6小时，以充分排除金属粉末和助烧剂中的水分。接着，称取各组分原料，按照质量百分比计，金属粉末的质量分为50％～60％，助烧剂的质量分为18～21％，造孔剂的质量分为20～29％。然后，将上述称取的金属粉末、助烧剂和造孔剂分别装入球磨罐中，在滚磨机上进行球磨混料，获得金属预混料。上述步骤S01中，金属粉末可以包括但不限于金、银、钯、铂和镍铬合金中的至少一种。助烧剂可以包括但不限于玻璃粉、高岭土、钠长石和钾长石中的至少一种。
上述步骤S02中，按照质量百分比计，将64％的上述步骤S01中的金属预混料与36％的有机成型剂，放入密炼机中进行密炼处理，密炼处理的温度控制在110℃，密炼处理的时间为4h，获得可供造粒的密炼料块。上述步骤S02中，有机成型剂为硬脂酸、石蜡和聚乙烯中的至少一种。在其中一些具体实施方式中，上述充当注塑喂料的有机成型剂，按照密炼料块质量分数为100％计，有机成型剂包括5％的硬脂酸、25％的石蜡和6％的聚乙烯。
上述步骤S03中，将上述步骤S02中的密炼料块放入注塑用的造粒机，通过造粒机进行造粒，获得注塑造粒料。
上述步骤S04中，将多孔基体1放入注塑模具中，再将注塑造粒料放入注射机中，通过金属粉末注塑成型工艺在多孔基体1上形成金属坯体。注塑的温度控制在100-200℃，注塑压力控制在30-100MPa，注塑的时间保持3-10s。
上述步骤S05中，将形成于多孔基体1上的金属坯体进行预烧处理，以排除金属坯体中所含的造孔剂和有机成型剂，避免有机混合物在后续烧结过程中污染金属粉末而导致金属粉末形成的多孔发热层电阻值稳定变差。预烧处理的温度控制在500-800℃，预烧处理的时间为8-20h。
上述步骤S06中，将预烧处理后的金属坯体置于真空环境或惰性气体保护 环境中进行烧结，获得多孔金属层与多孔基体1结合为一体的雾化芯成品。其中，烧结温度为600-1200℃，保温时间1-3h。
为使本发明上述实施细节和操作能清楚地被本领域技术人员理解，以及本发明雾化芯及其制备方法的进步性能显著地体现，以下通过实施例对本发明的实施进行举例说明。
实施例1
(1)干燥：将金属粉末、助烧剂和造孔剂进行干燥处理，干燥处理的温度控制在110℃，干燥处理的时间保持6小时，以充分排除金属粉末和助烧剂中的水分。
(2)称重/混料：称取各组分原料，按照质量百分比计，金属粉末的质量分为50％，助烧剂的质量分为21％，造孔剂的质量分为29％。接着，将上述称取的金属粉末、助烧剂和造孔剂分别装入球磨罐中，在滚磨机上进行球磨混料，获得金属预混料。金属粉末可以包括但不限于金、银、钯、铂和镍铬合金中的至少一种。助烧剂可以包括但不限于玻璃粉、高岭土、钠长石和钾长石中的至少一种。
(3)密炼/造粒：按照质量百分比计，将64％的金属预混料、5％的硬脂酸、25％的石蜡和6％的聚乙烯，放入密炼机中进行密炼处理，密炼处理的温度控制在110℃，密炼处理的时间为4h，获得可供造粒的密炼料块。接着，将密炼料块放入注塑用的造粒机，通过造粒机进行造粒，获得注塑造粒料。
(3)注塑成型：将多孔基体1放入注塑模具中，再将注塑造粒料放入注射机中，通过金属粉末注塑成型工艺在多孔基体1上形成金属坯体。注塑的温度控制在100℃，注塑压力控制在30MPa，注塑的时间保持3s。
(4)脱脂/烧结：将形成于多孔基体1上的金属坯体进行预烧处理，以排除金属坯体中所含的造孔剂和有机成型剂，避免有机混合物在后续烧结过程中污染金属粉末而导致金属粉末形成的多孔发热层电阻值稳定变差。预烧处理的 温度控制在500℃，预烧处理的时间为8h。接着，将预烧处理后的金属坯体置于真空环境或惰性气体保护环境中进行烧结，获得多孔金属层与多孔基体1结合为一体的雾化芯成品。其中，烧结温度为600℃，保温时间1h。
测试本实施例1制备的多孔发热层，孔隙率为40％，中值孔径为10um，厚度为0.2㎜。
实施例2
(3)干燥：将金属粉末、助烧剂和造孔剂进行干燥处理，干燥处理的温度控制在110℃，干燥处理的时间保持6小时，以充分排除金属粉末和助烧剂中的水分。
(4)称重/混料：称取各组分原料，按照质量百分比计，金属粉末的质量分为60％，助烧剂的质量分为18％，造孔剂的质量分为22％。接着，将上述称取的金属粉末、助烧剂和造孔剂分别装入球磨罐中，在滚磨机上进行球磨混料，获得金属预混料。上述步骤S01中，金属粉末可以包括但不限于金、银、钯、铂和镍铬合金中的至少一种。助烧剂可以包括但不限于玻璃粉、高岭土、钠长石和钾长石中的至少一种。
(3)密炼/造粒：按照质量百分比计，将64％的上述步骤S01中的金属预混料、5％的硬脂酸、25％的石蜡和6％的聚乙烯，放入密炼机中进行密炼处理，密炼处理的温度控制在110℃，密炼处理的时间为4h，获得可供造粒的密炼料块。接着，将密炼料块放入注塑用的造粒机，通过造粒机进行造粒，获得注塑造粒料。
(3)注塑成型：将多孔基体1放入注塑模具中，再将注塑造粒料放入注射机中，通过金属粉末注塑成型工艺在多孔基体1上形成金属坯体。注塑的温度控制在150℃，注塑压力控制在75MPa，注塑的时间保持6s。
(4)脱脂/烧结：将形成于多孔基体1上的金属坯体进行预烧处理，以排除金属坯体中所含的造孔剂和有机成型剂，避免有机混合物在后续烧结过程中 污染金属粉末而导致金属粉末形成的多孔发热层电阻值稳定变差。预烧处理的温度控制在700℃，预烧处理的时间为15h。接着，将预烧处理后的金属坯体置于真空环境或惰性气体保护环境中进行烧结，获得多孔金属层与多孔基体1结合为一体的雾化芯成品。其中，烧结温度为1000℃，保温时间2h。
测试本实施例2制备的多孔发热层，孔隙率为49％，中值孔径为22um，厚度为0.5㎜。
实施例3
(5)干燥：将金属粉末、助烧剂和造孔剂进行干燥处理，干燥处理的温度控制在110℃，干燥处理的时间保持6小时，以充分排除金属粉末和助烧剂中的水分。
(6)称重/混料：称取各组分原料，按照质量百分比计，金属粉末的质量分为60％，助烧剂的质量分为20％，造孔剂的质量分为20％。接着，将上述称取的金属粉末、助烧剂和造孔剂分别装入球磨罐中，在滚磨机上进行球磨混料，获得金属预混料。上述步骤S01中，金属粉末可以包括但不限于金、银、钯、铂和镍铬合金中的至少一种。助烧剂可以包括但不限于玻璃粉、高岭土、钠长石和钾长石中的至少一种。
(3)密炼/造粒：按照质量百分比计，将64％的上述步骤S01中的金属预混料、5％的硬脂酸、25％的石蜡和6％的聚乙烯，放入密炼机中进行密炼处理，密炼处理的温度控制在110℃，密炼处理的时间为4h，获得可供造粒的密炼料块。接着，将密炼料块放入注塑用的造粒机，通过造粒机进行造粒，获得注塑造粒料。
(3)注塑成型：将多孔基体1放入注塑模具中，再将注塑造粒料放入注射机中，通过金属粉末注塑成型工艺在多孔基体1上形成金属坯体。注塑的温度控制在100-200℃，注塑压力控制在30-100MPa，注塑的时间保持3-10s。
(4)脱脂/烧结：将形成于多孔基体1上的金属坯体进行预烧处理，以排除金属坯体中所含的造孔剂和有机成型剂，避免有机混合物在后续烧结过程中 污染金属粉末而导致金属粉末形成的多孔发热层电阻值稳定变差。预烧处理的温度控制在500-800℃，预烧处理的时间为8-20h。接着，将预烧处理后的金属坯体置于真空环境或惰性气体保护环境中进行烧结，获得多孔金属层与多孔基体1结合为一体的雾化芯成品。其中，烧结温度为600-1200℃，保温时间1-3h。
测试本实施例3制备的多孔发热层，孔隙率为60％，中值孔径为30um，厚度为0.8㎜。
实施例4
(7)干燥：将金属粉末、助烧剂和造孔剂进行干燥处理，干燥处理的温度控制在110℃，干燥处理的时间保持6小时，以充分排除金属粉末和助烧剂中的水分。
(8)称重/混料：称取各组分原料，按照质量百分比计，金属粉末的质量分为55％，助烧剂的质量分为21％，造孔剂的质量分为24％。接着，将上述称取的金属粉末、助烧剂和造孔剂分别装入球磨罐中，在滚磨机上进行球磨混料，获得金属预混料。上述步骤S01中，金属粉末可以包括但不限于金、银、钯、铂和镍铬合金中的至少一种。助烧剂可以包括但不限于玻璃粉、高岭土、钠长石和钾长石中的至少一种。
(3)密炼/造粒：按照质量百分比计，将64％的上述步骤S01中的金属预混料、5％的硬脂酸、25％的石蜡和6％的聚乙烯，放入密炼机中进行密炼处理，密炼处理的温度控制在110℃，密炼处理的时间为4h，获得可供造粒的密炼料块。接着，将密炼料块放入注塑用的造粒机，通过造粒机进行造粒，获得注塑造粒料。
(3)注塑成型：将多孔基体1放入注塑模具中，再将注塑造粒料放入注射机中，通过金属粉末注塑成型工艺在多孔基体1上形成金属坯体。注塑的温度控制在150℃，注塑压力控制在75MPa，注塑的时间保持6s。
(4)脱脂/烧结：将形成于多孔基体1上的金属坯体进行预烧处理，以排除金属坯体中所含的造孔剂和有机成型剂，避免有机混合物在后续烧结过程中 污染金属粉末而导致金属粉末形成的多孔发热层电阻值稳定变差。预烧处理的温度控制在700℃，预烧处理的时间为15h。接着，将预烧处理后的金属坯体置于真空环境或惰性气体保护环境中进行烧结，获得多孔金属层与多孔基体1结合为一体的雾化芯成品。其中，烧结温度为1000℃，保温时间2h。
测试本实施例2制备的多孔发热层，孔隙率为50％，中值孔径为23um，厚度为0.5㎜。
雾化芯相关性能测试：
将上述实施例1至实施例4和常规厚膜雾化芯，在同样7W功率下测试TPM(气溶胶量)进行对比，测试数据如表1。
表1实施例1至实施例4中的雾化芯和常规厚膜雾化芯的TPM(气溶胶量)测试表
由上述表1可知，实施例1至实施例4中的雾化芯的抽吸20口、40口、60口、80口、100口、120口和140口的气溶胶量，与对比例中的常规厚膜雾化芯抽吸20口、40口、60口、80口、100口、120口和140口的气溶胶量相比，气溶胶量均有明显提高，表明实施例1至实施例3中的雾化芯的雾化效率比对比例中的常规厚膜雾化芯的雾化效率高。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种雾化芯，其特征在于，包括：
    多孔基体，用于储存及传输气溶胶形成基质，所述多孔基体的表面形成有用于供气溶胶形成基质加热雾化的第一雾化面；以及
    加热层，用于在通电后加热并雾化气溶胶形成基质，所述加热层设置于所述多孔基体具有所述第一雾化面的表面上；
    其中，所述加热层为形成于所述多孔基体上的多孔发热层，所述多孔发热层的厚度为0.2～0.8㎜，所述多孔发热层的孔径为10～30μm，所述多孔发热层可吸附所述多孔基体上的气溶胶形成基质，且所述多孔发热层可将吸附的气溶胶形成基质传输至所述多孔发热层的表面，以使所述多孔发热层的表面形成用于供气溶胶形成基质加热雾化的第二雾化面。
  2. 如权利要求1所述的雾化芯，其特征在于，所述多孔发热层的孔隙率为40～60％。
  3. 如权利要求1或2所述的雾化芯，其特征在于，所述多孔发热层呈S型结构或C型结构布置于所述多孔基体的表面上；或者，所述多孔发热层呈同心环状结构或同心圆弧状结构布置于所述多孔基体的表面上；亦或者，所述多孔发热层上设有圆形通孔、矩形通孔、椭圆形通孔、菱形通孔、五角星形通孔和孔状图案中的至少一种镂空结构，以使所述多孔基体的表面可在所述镂空结构所限定的区域范围内界定出所述第一雾化面。
  4. 如权利要求1或2所述的雾化芯，其特征在于，所述多孔基体背离所述第一雾化面的一端凹设有储液槽，所述储液槽的槽口用于与所述雾化器的储液腔连通。
  5. 一种雾化器，其特征在于，包括如权利要求1至4任一项所述的雾化芯。
  6. 一种气溶胶发生装置，其特征在于，包括如权利要求1至4任一项所述的雾化芯或如权利要求5所述的雾化器。
  7. 一种雾化芯制备方法，其特征在于，包括如下步骤：
    步骤S01：将金属粉末、助烧剂和造孔剂球磨混合，获得金属预混料；
    步骤S02：将所述金属预混料与有机成型剂放入密炼机中进行密炼，获得密炼料块；
    步骤S03：将所述密炼料块通过造粒机进行造粒，获得注塑造粒料；
    步骤S04：将所述注塑造粒料放入注射机中，通过金属粉末注塑成型工艺在多孔基体上形成金属坯体；
    步骤S05：将所述金属坯体进行预烧处理，以排除所述金属坯体中所含的造孔剂和有机成型剂；
    步骤S06：将预烧处理后的所述金属坯体进行真空烧结，获得多孔金属层与多孔基体结合为一体的雾化芯成品。
  8. 如权利要求7所述的雾化芯制备方法，其特征在于，所述步骤S01中，按照质量百分比计，所述金属粉末的质量分为50％～60％，所述助烧剂的质量分为18～21％，所述造孔剂的质量分为20～29％。
  9. 如权利要求7所述的雾化芯制备方法，其特征在于，所述步骤S01中，所述金属粉末为金、银、钯、铂和镍铬合金中的至少一种。
  10. 如权利要求7所述的雾化芯制备方法，其特征在于，所述步骤S01中，所述助烧剂为玻璃粉、高岭土、钠长石和钾长石中的至少一种。
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