CN113170927A

CN113170927A - Heating element and aerosol generating device

Info

Publication number: CN113170927A
Application number: CN202010721300.4A
Authority: CN
Inventors: 杜昊; 龙太君; 丁毅; 李青羽; 张宁
Original assignee: Shenzhen ALD Technology Co Ltd
Current assignee: ALD Group Ltd; Shenzhen ALD Technology Co Ltd
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2021-07-27
Also published as: WO2022017455A1

Abstract

The invention provides a heating assembly, which comprises a controller, a power supply and a heating element, wherein the power supply is electrically connected with the controller; the heating element comprises an integrally conductive aerosol-generating substrate heating element for heating the aerosol-forming substrate to produce an aerosol and an electrode provided to the heating element, the heating element being electrically connected to the controller via the electrode. The heating assembly and the aerosol generating device provided by the invention are a heating non-combustion device, and can ensure the uniformity of heating temperature distribution and the consistency of the produced aerosol.

Description

Heating element and aerosol generating device

[ technical field ] A method for producing a semiconductor device

The present invention relates to the field of aerosol devices, and in particular to a heating assembly for an aerosol-generating device and an aerosol-generating device.

[ background of the invention ]

In a heating and non-combustion assembly applied to an aerosol generating device in the market at present, a conductive track formed by printing metal slurry such as gold, silver, platinum and/or nickel with a certain resistance value on a substrate such as a zirconia sheet is adopted as a heating element, and the conductive track generates heat to be transferred to the zirconia sheet after being electrified, so that the aerosol forming substrate is heated through the zirconia sheet. On one hand, the heat is transferred to the zirconium oxide sheet through the conductive track, so that the temperature difference is generated between the conductive track and the zirconium oxide sheet, meanwhile, the temperature of the part close to the conductive track is high, the temperature of the part far away from the conductive track is low, the temperature distribution is uneven, the consistency of the released aerosol is poor, and the use requirements of people cannot be met; on the other hand, the conductive traces are easily separated from the substrate at high temperatures during use.

[ summary of the invention ]

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a heating unit and an aerosol-generating device that can prevent combustion by heating and can achieve uniformity of heating temperature distribution and uniformity of generated aerosol.

In order to achieve the above object, a first aspect of the present invention provides a heating assembly for an aerosol-generating device, comprising a controller, a power supply electrically connected to the controller, and a heating element, the heating element comprising an integrally electrically conductive aerosol-generating substrate heating element for heating an aerosol-forming substrate to produce an aerosol, and an electrode provided to the heating element, the heating element being electrically connected to the controller via the electrode. The integral conductive heating element of the invention means that the heating element can complete the work of combining the substrate and the conductive track in the prior art due to the conductive characteristic of the heating element, and the heating is more uniform and consistent due to the integral conduction of the heating element.

As a preferable technical scheme, the electrode is further provided with a protruding pin, and the heating element is electrically connected with the controller through the electrode pin.

As a preferable technical scheme, the raw material components of the heating body comprise matrix powder, metal powder and high-temperature binder phase powder.

The mass of the matrix powder accounts for 80-92.5% of the mass of the heating element, the mass of the metal powder accounts for 5-15% of the mass of the heating element, and the mass of the high-temperature bonding phase substance powder accounts for 2.5-5% of the mass of the heating element. .

The matrix powder is oxide powder, nitride powder or carbide powder.

The oxide powder is ZrO₂、SiO₂Or Al₂O₃At least one of (1).

The nitride powder is at least one of SiN, TiN, and AlN.

The carbide powder is at least one selected from powdered SiC, TiC and AlC.

The metal powder is selected from transition metal simple substance powder or metal alloy powder; as a further preferred embodiment, the transition metal includes Ag, Co, Ti, Cu, Pt, Mo, Ni, Cr or W.

The high-temperature bonding phase is used for bonding the matrix powder and the metal powder at high temperature (1500-1800 ℃), and as a preferable technical scheme, the high-temperature bonding phase substance powder is glass phase substance powder, namely oxide capable of forming glass at high temperature; as a further preferable technical solution, the glass phase substance powder is selected from SiO₂、Al₂O₃、CaO、B₂O₃、Bi₂O₃In powder toOne of them is less.

The granularity of the matrix powder, the transition metal powder and the high-temperature bonding phase substance powder is 1-20 mu m.

The heating element has a resistivity of 5 to 5000 [ mu ] omega-m, more preferably 10 to 1000 [ mu ] omega-m.

The heating element is produced by a method comprising the following steps:

(1) and (3) preparing materials: respectively weighing matrix powder, metal powder and glass phase substance powder according to a predetermined proportion, and uniformly mixing;

(2) and grinding materials: putting the mixed raw material powder into a grinding machine for grinding;

(3) drying to form a blank: drying the ground raw materials, adding a forming agent, uniformly mixing, and preparing into a blank body through a die in a dry pressing, tape casting or extrusion mode;

(4) and sintering and forming: and (3) moving the formed blank into a sintering furnace for normal pressure or hot-pressing sintering, and cooling along with the furnace to obtain the heating element.

The forming agent in the step (3) is at least one of paraffin, tung oil, polyethylene glycol, polyvinyl alcohol or polymethyl cellulose.

As a preferred technical scheme, the heating element is a cylindrical body with openings at two ends, and an inner cavity of the cylindrical body is used for placing an aerosol forming substrate; two ends of the cylindrical body are respectively provided with one electrode, and the polarities of the two electrodes are opposite.

The heating element comprises at least two cylinder bodies which are connected in sequence, two ends of each cylinder body are provided with openings, and the inner cavities of the at least two cylinder bodies are used for placing aerosol forming substrates; in the at least two cylindrical bodies, one electrode is arranged at the joint between two adjacent cylindrical bodies, one end of the first cylindrical body, which is far away from the cylindrical body adjacent to the first cylindrical body, is provided with one electrode, one end of the last cylindrical body, which is far away from the cylindrical body adjacent to the last cylindrical body, is provided with one electrode, and the polarities of the two adjacent electrodes are opposite.

The at least two cartridges may be independently operable to enable staged heating of the aerosol-forming substrate.

As a preferable technical solution, the heating element is a sheet-like body which is partially or entirely inserted into the aerosol-forming substrate; the sheet body is provided with at least one through groove penetrating through the front surface and the back surface of the sheet body, the through groove extends along the axial direction of the sheet body, one end of the through groove extends to the first end of the sheet body, the other end of the through groove is close to the second end of the sheet body, the first end of the sheet body is provided with one electrode on each of two sides of each through groove, and the polarities of the two adjacent electrodes are opposite.

The second end of the sheet-like body is formed with a pointed end to facilitate insertion of the sheet-like body into the interior of an aerosol-forming substrate.

The heating body can also comprise a cylinder body or a cup body, the sheet-shaped body is partially or completely accommodated in the cylinder body or the cup body, and the inner cavity of the cylinder body or the cup body is used for placing aerosol forming substrates; the sheet-like body is used for being partially or completely inserted into the aerosol-forming substrate, two ends of the cylinder body or the cup body are respectively provided with an electrode, and the polarities of the two electrodes are opposite.

As a preferable technical solution, the heating element is a needle-shaped body, and the needle-shaped body is used for being partially or completely inserted into the aerosol-forming substrate; the needle-shaped body is provided with a through groove penetrating through the outer peripheral surface of the needle-shaped body, the through groove extends along the axial direction of the needle-shaped body, one end of the through groove extends to the first end of the needle-shaped body, the other end of the through groove is close to the second end of the needle-shaped body, the first end of the needle-shaped body is provided with one electrode on each of two sides of the through groove, and the two electrodes are opposite in polarity.

The through-groove may be filled with an insulating material in order to enhance the hardness of the heating element or to prevent the aerosol-forming substrate from remaining in the through-groove.

The second end of the needle is pointed to facilitate insertion of the needle into the interior of the aerosol-forming substrate.

The heating body can also comprise a cylinder body or a cup body, the needle-shaped body is partially or completely accommodated in the cylinder body or the cup body, and the inner cavity of the cylinder body or the cup body is used for placing aerosol forming substrates; the needle-shaped body is used for being partially or completely inserted into the aerosol-forming substrate, two ends of the cylinder body or the cup body are respectively provided with an electrode, and the polarities of the two electrodes are opposite.

As a preferred technical scheme, the heating element is a cup-shaped body with an opening at one end, and an inner cavity of the cup-shaped body is used for placing an aerosol forming substrate; two ends of the cup-shaped body are respectively provided with one electrode, and the polarities of the two electrodes are opposite.

The bottom of the cup-shaped body is provided with a vent hole.

Preferably, the electrode is a low-melting-point metal alloy material, and the low-melting-point metal alloy material is provided to the heating element by brazing or by fastening with a caliper.

The resistivity of the metal alloy material piece is greater than 0 [ mu ] omega-m and less than 0.11 [ mu ] omega-m.

A second aspect of the present invention also provides an aerosol-generating device comprising a heating assembly as described in the preceding claims.

According to the heating assembly and the aerosol generating device provided by the invention, heat is generated by conducting and heating the whole heating body, compared with the method that the conductive track is printed on the heating body, the heating of the aerosol forming substrate is realized in a heating and non-combustion mode, the temperature distribution uniformity of the heating body can be ensured, the condition that the local temperature is too high or too low can not occur in the heating process, the consistency of the produced aerosol is ensured, and the use requirements of people are met.

In addition, the heating assembly and the aerosol generating device of the invention have the advantages that the through groove is filled with the insulating substance, the hardness of the heating body can be enhanced, the aerosol forming substrate is prevented from remaining in the through groove, and the taste is better.

[ description of the drawings ]

To further disclose the specific technical content of the present disclosure, please refer to the attached drawings, wherein:

fig. 1 is a schematic structural diagram of a heating element of a heating assembly according to an embodiment of the present invention;

FIG. 2 is a schematic view of a first alternative of the heating element of FIG. 1;

FIG. 3 is a schematic view of a second alternative of the heating element of FIG. 1;

FIG. 4 is a schematic view of a third alternative of the heating element of FIG. 1;

FIG. 5 is a schematic view of a fourth alternative of the heating element of FIG. 1;

fig. 6 is a schematic view of a fifth alternative of the heating element of fig. 1.

Description of the symbols:

cylindrical heating element 111 sheet heating element 112

Needle-like heating element 113 second sheet-like heating element 114

Cup-shaped heating element 115

Electrode 12 penetrating groove 13

Tip 14 vent 15

[ detailed description ] embodiments

Embodiments of the present invention provide an aerosol-generating device comprising a housing and a heating assembly disposed within the housing. The housing is open at one end to facilitate placement of the aerosol-forming substrate. The heating assembly comprises a controller, a power supply electrically connected with the controller and a heating element. The controller is used for controlling the operation of the heating element. The power supply is used for supplying power to the heating element. The power supply is, for example, a battery, which provides an output voltage of, for example, 2.0-5.0V.

Referring to fig. 1, the heating element comprises a cylindrical heating element 111 (cylinder) for heating the aerosol-forming substrate to produce an aerosol, and an electrode 12 disposed on the cylinder 111. The electrode 12 may be an electric contact or an electric contact piece printed or attached on the heating element, the electrode 12 is electrically connected to the cylindrical body 111, and the cylindrical body 111 is electrically connected to the controller via the electrode 12. In order to save space, a pin (not shown in fig. 1) may also be extended from the electrode 12 to electrically connect with the controller, so that the power supply supplies power to the cylindrical body 111 through the controller, the pin and the electrode 12. The aerosol-forming substrate is an aerosol-generating article in the shape of a cigarette. Through the structure, the tubular body 111 generates heat through self conduction and heating, so that heating of the aerosol forming substrate is realized, the uniformity of heating temperature distribution is ensured, the situation that local temperature is too high or too low is avoided, the consistency of the produced aerosol is ensured, the tubular body 111 has the characteristics of high temperature rise, high thermal efficiency, high thermal conductivity and the like, the high efficiency of the produced aerosol is also ensured, and the use requirements of people are greatly met.

Whether or not the pins are provided on the electrodes of the heating element depends on the size of the space of the aerosol generating device. When the aerosol generating device needs to be miniaturized, the heating body and the controller do not need to be directly contacted and assembled at the same position, and the heating body and the controller can be respectively arranged in convenient spaces according to needs and are electrically connected through pins; in the case of an aerosol-generating device having a large space, the heating element and the controller may be provided together, and the heating element and the controller may be electrically connected directly to each other via the electrical contact/contact type electrode.

The cylindrical body 111 has a resistivity of 5 [ mu ] omega-m (micro-ohm-m) to 5000 [ mu ] omega-m, preferably 10 [ mu ] omega-m to 1000 [ mu ] omega-m.

The electrode 12 is a low resistivity metal alloy material that is disposed to the cylinder 111 in a brazed or caliper-secured manner. The resistivity of the low-resistivity metal alloy material piece is more than 0 [ mu ] omega-m and less than 0.11 [ mu ] omega-m, and preferably 0.09 [ mu ] omega-m. The low-resistivity metal alloy material piece comprises raw material components of Ag 62%, Cu 28%, In 8% and Ti 2%.

In this embodiment, the inner cavity of the cartridge 111 with openings at both ends is used for placing the aerosol-forming substrate, and in practical use, the aerosol-forming substrate can be placed into the inner cavity of the cartridge 111 through the opening at one end of the outer shell. One annular electrode 12 is provided at each end of the cylindrical body 111. The polarity of the two electrodes 12 is opposite.

Referring to fig. 2, in a first alternative, the heating element includes at least two cylinder bodies 111 connected in sequence, two ends of the cylinder body 111 are open, inner cavities of the at least two cylinder bodies 111 are used for placing aerosol-forming substrates, and in practical application, the aerosol-forming substrates can be placed in the inner cavities of the at least two cylinder bodies 111 through an opening at one end of the outer shell. In the at least two cylindrical bodies 111, an annular electrode 12 is disposed at a connection position between two adjacent cylindrical bodies 111, an annular electrode 12 is disposed at one end of the first cylindrical body 111 far from the cylindrical body 111 adjacent thereto, and an annular electrode 12 is disposed at one end of the last cylindrical body 111 far from the cylindrical body 111 adjacent thereto. The polarities of the adjacent two electrodes 12 are opposite. This embodiment shows two cylinders 111 connected in series.

The at least two cylinders 111 may work in combination. It will be appreciated that the at least two cartridges 111 may also operate independently so that segmented heating of the aerosol-forming substrate may be achieved, so that control of the amount of aerosol generated may be achieved. The independent operation of each cartridge 111 may be controlled by a controller.

The number of the cylindrical bodies 111 of the present embodiment may also be, for example, three, four, five, etc., and may be set according to actual circumstances.

Referring to fig. 3, in a second alternative, the heat-generating body is a sheet-like heat-generating body 112 (sheet-like body). The sheet 112 is intended to be partially or wholly inserted into the interior of an aerosol-forming substrate and in practice the aerosol-forming substrate may be inserted into the sheet 112 through an opening at one end of the housing so that the sheet 112 is partially or wholly inserted into the interior of the aerosol-forming substrate. The sheet-like body 112 has a through groove 13 penetrating the front and back surfaces thereof. The through groove 13 extends in the axial direction of the sheet-shaped body 112, and one end of the through groove 13 extends to a first end of the sheet-shaped body 112, and the other end is close to a second end of the sheet-shaped body 112. The first end of the sheet-like body 112 is provided with one electrode 12 on each side of the through-groove 13. Each electrode 12 comprises two portions, one on each of the front and back sides of the first end of the wafer 112. The polarity of the two electrodes 12 is opposite. As previously mentioned, depending on the spatial conditions of the aerosol-generating device, pins may or may not be provided on the electrodes 12.

The second end of the sheet 112 is formed with a triangular tip 14 to facilitate insertion of the sheet 112 into the interior of an aerosol-forming substrate.

In order to realize more uniform heating of the inner part and the outer part of the aerosol matrix, the heating body can also comprise a cylinder body or a cup body, the flaky body is partially or completely accommodated in the cylinder body or the cup body, and the aerosol forming matrix is placed in the inner cavity of the cylinder body or the cup body; the sheet may be partially or wholly inserted into the aerosol-forming substrate and the ends of the cylinder or cup are provided with an electrode of opposite polarity respectively.

Referring to fig. 4, in the third alternative, the heating element is a needle-like heating element 113 (needle-like body). The needles 113 are intended to be partially or wholly inserted into the interior of an aerosol-forming substrate and, in use, the aerosol-forming substrate may be inserted into the needles 113 through an opening at one end of the housing so that the needles 113 are partially or wholly inserted into the interior of the aerosol-forming substrate. The needle-like body 113 has a through groove 13 penetrating its outer peripheral surface. The through groove 13 extends along the axial direction of the needle body 113, one end of the through groove 13 extends to the first end of the needle body 113, the other end is close to the second end of the needle body 113, and the first end of the needle body 113 is provided with a semicircular electrode 12 at each side of the through groove 13. The polarity of the two electrodes 12 is opposite. As previously mentioned, depending on the spatial conditions of the aerosol-generating device, pins may or may not be provided on the electrodes 12.

The second end of the needle 113 is a tapered tip 14 to facilitate insertion of the needle 113 into the interior of the aerosol-forming substrate.

In order to realize more uniform heating of the inner part and the outer part of the aerosol matrix, the heating body can also comprise a cylinder body or a cup body, a needle-shaped body is partially or completely accommodated in the cylinder body or the cup body, and the aerosol forming matrix is placed in the inner cavity of the cylinder body or the cup body; the needle may be partially or wholly inserted into the aerosol-forming substrate and the two ends of the barrel or cup are provided with an electrode of opposite polarity respectively.

Referring to fig. 5, in the fourth alternative, the heat generating body is a second sheet-like heat generating body 114 (second sheet-like body). The second sheet 114 is intended to be partially or wholly inserted into the interior of an aerosol-forming substrate and, in use, the aerosol-forming substrate may be inserted into the second sheet 114 through an opening at one end of the housing so that the second sheet 114 is partially or wholly inserted into the interior of the aerosol-forming substrate. The second sheet member 114 is provided with at least two through grooves 13 penetrating the front and rear surfaces thereof. The through groove 13 extends in the axial direction of the second sheet 114, and one end of the through groove 13 extends to the first end of the second sheet 114, and the other end is close to the second end of the second sheet 114. The first end of the second sheet 114 is provided with one electrode on each side of each through-groove 13. Each electrode 12 comprises two portions, one on each of the front and back sides of the first end of the second platelet 114. The polarities of the adjacent two electrodes 12 are opposite. As previously mentioned, depending on the spatial conditions of the aerosol-generating device, pins may or may not be provided on the electrodes 12.

The present embodiment shows two through grooves 13. It is understood that the number of the through slots 13 may be three, four, etc., and may be set according to actual situations.

The second end of the second sheet 114 is formed with a triangular tip 14 to facilitate insertion of the second sheet 114 into the interior of an aerosol-forming substrate.

Referring to fig. 6, in a fifth alternative, the heating element is a cup-shaped heating element 115 (cup-shaped body) having one end open. The interior cavity of the cup 115 is for the aerosol-forming substrate to be placed into, and in practice, the aerosol-forming substrate may be placed into the interior cavity of the cup 115 through an opening at one end of the outer housing. The cup 115 is provided with a ring-shaped electrode (not shown in fig. 6) at each end. The polarity of the two electrodes is opposite. As previously mentioned, depending on the spatial conditions of the aerosol-generating device, pins may or may not be provided on the electrodes 12.

The bottom of the cup 115 is provided with a vent hole 15, and the vent hole 15 facilitates the entry of outside air so as to be inhaled by a user together with the generated aerosol.

Further, the raw material composition applied to the integrally electroconductive aerosol-generating substrate heating element of the present invention is composed of a substrate powder, a metal powderAnd the integral conductive heating green body of the high-temperature binding phase is integrally sintered and molded. The matrix powder may be an oxide powder (e.g., ZrO)₂、Al₂O₃Or SiO₂) Nitride powder (SiN, TiN or/and AlN) or carbide powder (SiC, TiC or/and AlC), but the carbide powder produces a heat generator with the most uniform heat distribution.

The mass of the metal powder accounts for 5-15% of the heating element, and the mass of the high-temperature bonding phase substance powder accounts for 2.5-5% of the heating element. The metal powder is selected from transition metal simple substance powder or alloy powder, the transition metal powder can be selected from Ag, Co, Ti, Cu, Pt, Mo, Ni, Cr or W according to requirements, the simple substance powder or the alloy powder of Ag, Cu and Ni is selected, the resistivity of the obtained heating element is relatively low, and the simple substance powder or the alloy powder of Pt and W is selected, the resistivity of the obtained heating element is relatively high.

The binding phase powder is a powder for binding the matrix powder and the metal powder and may be a powder of a glassy phase material, such as SiO₂、Al₂O₃、CaO、B₂O₃、Bi₂O₃At least one of the powders.

The particle size of the matrix powder, the transition metal powder and the glass phase powder is 1-20 μm.

The following will explain in detail the preparation of the heat-generating body and the heating element etc. provided by the present invention by the preparation examples and comparative examples, and perform the performance test and comparison with other types of heating products.

Preparation example 1

The preparation example comprises the following specific steps:

(1) ingredients

Respectively taking 90 g of SiC powder (the purity is more than or equal to 95 percent and the preferred purity is 99 percent) and 10 g of TiC powder (the purity is more than or equal to 95 percent and the preferred purity is 99 percent), adding 15 g of metal simple substance Ni powder and simultaneously adding 5 g of glass phase substance powder (the main component of the glass phase substance is SiO)₂、Al₂O₃、B₂O₃In which SiO is present in a weight ratio₂：Al₂O₃：B₂O₃9:4: 3); the particle size D50 of the raw material powder is 5 μm;

(2) abrasive material

Putting the weighed raw materials into a ball mill, adding deionized water as a dispersion medium, wherein zirconium balls are grinding materials, and the raw materials comprise: zirconium ball: the weight ratio of water is 1: 2: 0.6, ball milling time is 22 h;

(3) spray drying

Directly pressing the ball-milled slurry into a centrifugal drier through a peristaltic pump, and evaporating water contained in the slurry out after high-temperature heating dehydration so as to change powder into dry powder;

(4) forming a blank

Adding additives such as tung oil, polymethyl cellulose and polyethylene glycol which account for 5 percent of the total weight of the powder as a forming agent (wherein the weight ratio of the tung oil to the carboxymethyl cellulose to the polyethylene glycol is 0.5:1:1), adding deionized water with the weight ratio of 10 percent, stirring the powder, the deionized water and the forming agent in a stirrer for 2-3 hours to fully mix, taking out the powder from the stirrer, and sealing and aging for 20-24 hours;

extruding the pug into a cylindrical blank under the pressure of 20-30Mpa by an extrusion molding machine, and placing the extruded product into a microwave oven for quick drying to harden the product to prevent cracking and deformation;

(5) sintering

Transferring the blank into a sagger made of high-temperature refractory material, and keeping the pressure of N at 1 atmosphere₂Under the protective atmosphere, the temperature rising speed is 8 ℃/min, the temperature rises to the highest temperature of 1500 ℃, the sintering is kept for 4h under normal pressure, and the sintering is naturally cooled along with the furnace after the sintering is finished;

(6) post-processing

And (3) grinding the outer surface of the sintered and molded cylindrical heating element through centerless grinding to be flat to reach the standard thickness (0.5-1.0mm), and cleaning the surface of the cylindrical heating element through ultrasonic waves to remove dust on the surface of the cylindrical heating element to obtain the heating element A.

For subsequent use

After the cylindrical heating element is manufactured, electrodes made of a low melting point metal alloy are arranged at two ends of the cylindrical heating element in a brazing or caliper fastening mode, and therefore the heating element is manufactured. When the power supply supplies voltage, the cylindrical heating body conducts electricity to convert electric energy into heat energy, high temperature is generated instantly, and the generated heat heats the aerosol forming substrate, so that the aerosol is generated to be sucked by a user.

Preparation example 2

The preparation example comprises the following specific steps:

(1) ingredients

Respectively taking 95 g and 5 g of SiC powder (the purity is more than or equal to 95 percent, the preferred purity is 99 percent) and 95 g and 5 g of TiN powder (the purity is more than or equal to 95 percent, the preferred purity is 99 percent), adding 12 g of metal powder mixture (the metal powder is Ni, Cr and Mo alloy powder, wherein the weight ratio of Ni to Cr to Mo is 75: 23: 2), and simultaneously adding 3 g of glass phase substance powder (the main component of the glass phase substance is SiO)₂、Al₂O₃CaO in which SiO is present in a weight ratio₂：Al₂O₃: CaO 4: 2: 0.5), the particle size D50 of the raw material powder is 20 μm;

(2) abrasive material

Putting the raw materials weighed according to the step (1) into a ball mill, adding deionized water as a dispersion medium, taking zirconium balls as an abrasive, and carrying out ball milling for 24 hours, wherein the raw materials: zirconium ball: water 1: 2: 0.6;

(3) spray granulation

Adding 8-10% PVA aqueous solution (with the concentration of 10%) as a forming agent into the ball-milled slurry within 1-2h before discharging, uniformly mixing the slurry with water, directly pressing the mixture into a centrifugal sprayer through a peristaltic pump, and then heating at high temperature for dehydration and granulation to ensure that the powder is directly changed into a spherical shape, wherein the particle size is 100-200 mu m;

(4) forming a blank

Pressing the finished granules into a sheet blank by a dry pressing forming machine under the pressure of 30 MPa;

(5) sintering

Transferring the blank into a sagger made of high-temperature refractory material at an atmospheric pressure N₂Under the protective atmosphere, the temperature rising speed is 10 ℃/min,heating to 1300 ℃ at the highest temperature, keeping the temperature for 3h for hot pressing sintering (the hot pressing pressure is 30MPa), and naturally cooling along with the furnace after sintering;

(6) subsequent processing

And grinding the sintered sheet heating element to enable the upper surface and the lower surface of the sintered sheet heating element to be flat to reach the standard thickness (0.5-1.0mm), directly forming a gap in the middle through a die or cutting the sintered sheet heating element through post-processing, and cleaning the gap by adopting ultrasonic waves to remove dust on the surface of the sintered sheet heating element to obtain the heating element B.

For subsequent use

After the sheet heating element is manufactured, electrodes made of a low melting point metal alloy are arranged on the front surface and the back surface of the first end of the sheet heating element in a brazing or caliper fastening mode and located on two sides of the corresponding through grooves, and therefore the heating element is manufactured. When the power supply supplies voltage, the sheet heating element conducts electricity to convert electric energy into heat energy, high temperature is generated instantly, and the generated heat heats the aerosol forming substrate, so that the aerosol is generated to be sucked by a user.

Preparation example 3

The preparation example comprises the following specific steps:

(1) ingredients

Respectively taking SiC powder (the purity is more than or equal to 95 percent, the preferred purity is 99 percent) and AlN powder (the purity is more than or equal to 95 percent, the preferred purity is 99 percent) 85 g and 15 g, adding tungsten (W) metal powder 8 g, and simultaneously adding glass phase substance 3 g (the main component of the glass phase substance is SiO)₂、Al₂O₃In which SiO is present in a weight ratio₂：Al₂O₃4: 2) the particle size D50 of the raw material powder is 5 μm;

(2) abrasive material

Putting the weighed raw materials into a ball mill, adding deionized water as a dispersion medium, wherein zirconium balls are grinding materials, and the raw materials comprise: zirconium ball: water 1: 2: 0.6, ball milling time is 22 h;

(3) spray drying

(4) stirring to form blank

Adding paraffin accounting for 15% of the powder weight as a forming agent into the powder after spray granulation, stirring the powder and the paraffin in a stirrer for 20 hours, and heating to 80 ℃ to fully mix the powder and the paraffin; then transferring the slurry into a formed stirring charging barrel, injecting the slurry into a pre-mold under the pressure of 0.6MPa to prepare a needle-shaped blank, and forming after cooling;

(5) sintering

Burying the product in alumina powder, treating at high temperature of 500-₂Or under the protection of Ar gas, heating to 1300 ℃ and 1500 ℃ at the heating speed of 5-10 ℃/min, keeping the temperature for 2-4h, sintering at normal pressure, and naturally cooling along with the furnace after sintering;

(6) subsequent processing

And (3) passing the sintered needle-shaped heating element through a grinding machine, grinding the outer surface of the sintered needle-shaped heating element smoothly until the outer surface reaches the required size, and cleaning the outer surface by adopting ultrasonic waves to remove dust on the surface to obtain a heating element C.

For subsequent use

After the needle-shaped heating element is manufactured, electrodes made of low-melting-point metal alloy are arranged at the first end of the needle-shaped heating element in a brazing or caliper fastening mode and are positioned at two sides of the through groove, and therefore the heating element is manufactured. When the power supply supplies voltage, the needle-shaped heating body conducts electricity to convert electric energy into heat energy, high temperature is generated instantly, and the generated heat heats the aerosol forming substrate, so that the aerosol is generated to be sucked by a user.

Preparation example 4

The preparation example comprises the following specific steps:

(1) ingredients

Respectively taking 100 g of SiC powder (the purity is more than or equal to 95 percent, and the preferred purity is 99 percent), adding 15 g of metal simple substance Ni powder, and simultaneously adding 5 g of glass phase substance powder (the main component of the glass phase substance is SiO)₂、Al₂O₃、B₂O₃In which SiO is present in a weight ratio₂：Al₂O₃：B₂O₃9:4: 3); the particle size D50 of the raw material powder is 5 μm;

(2) abrasive material

(3) spray drying

(4) forming a blank

(5) sintering

(6) post-processing

And (3) grinding the outer surface of the sintered and molded cylindrical heating body to be flat by centerless grinding to reach the standard thickness (0.5-1.0mm), and cleaning by adopting ultrasonic waves to remove dust on the surface of the cylindrical heating body to obtain a heating body D.

For subsequent use

Preparation example 5

The preparation example comprises the following specific steps:

(1) ingredients

100 g of SiN powder (the purity is more than or equal to 95 percent, the preferred purity is 99 percent) is respectively taken, 15 g of metal simple substance Ni powder is added, and 5 g of glass phase substance powder (the main component of the glass phase substance is SiO)₂、Al₂O₃、B₂O₃In which SiO is present in a weight ratio₂：Al₂O₃：B₂O₃9:4: 3); the particle size D50 of the raw material powder is 5 μm;

(2) abrasive material

(3) spray drying

(4) forming a blank

(5) sintering

(6) post-processing

And (3) grinding the outer surface of the sintered and molded cylindrical heating element through centerless grinding to be flat to reach the standard thickness (0.5-1.0mm), and cleaning by adopting ultrasonic waves to remove dust on the surface of the cylindrical heating element to obtain the heating element E.

For subsequent use

Preparation example 6

The preparation example comprises the following specific steps:

(1) ingredients

Respectively taking 100 g of ZrO₂Powder (purity is more than or equal to 95 percent, and the preferred purity is 99 percent), 15 grams of metal simple substance Ni powder is added, and 5 grams of glass phase substance powder (the main component of the glass phase substance is SiO)₂、Al₂O₃、B₂O₃In which SiO is present in a weight ratio₂：Al₂O₃：B₂O₃9:4: 3); the particle size D50 of the raw material powder is 5 μm;

(2) abrasive material

(3) spray drying

(4) forming a blank

(5) sintering

(6) post-processing

And (3) grinding the outer surface of the sintered and molded cylindrical heating element through centerless grinding to be flat to reach the standard thickness (0.5-1.0mm), and cleaning the surface of the cylindrical heating element through ultrasonic waves to remove dust on the surface of the cylindrical heating element to obtain the heating element F.

For subsequent use

Comparative preparation example 1

The specific procedure of this comparative example is as follows:

(1) ingredients

Respectively taking 90 g of SiC powder (the purity is more than or equal to 95 percent, and the preferred purity is 99 percent) and 10 g of TiC powder (the purity is more than or equal to 95 percent, and the preferred purity is 99 percent), wherein the granularity D50 of the powder is 5 mu m;

(2) abrasive material

(3) spray drying

(4) forming a blank

the pug is cast into a cylindrical blank, and the extruded product is placed in a microwave oven for quick drying to harden the blank to prevent cracking and deformation;

(5) sintering

(6) and (3) subsequent processing: the upper surface and the lower surface of the sintered body are subjected to plane grinding, and the surface roughness reaches Ra of less than or equal to 0.3 mu m;

(7) printing and sintering the conductive layer: cleaning and drying, printing insulating layer glass medium slurry, wherein the printing thickness is 20-30 mu m, sintering at the high temperature of 1200 ℃/30min to form an insulating layer, printing metal conductive slurry (silver palladium slurry or platinum slurry and the like) on the sintered insulating layer by screen printing according to a designed conductive pattern, wherein the printing thickness is 20-30 mu m, drying at 200 ℃/1h, and sintering at the high temperature of 1000 ℃/30min to form a conductive layer to obtain the heating element X.

(8) Electrode connection: performing surface nickel plating treatment on two ends of the heating body X, and performing brazing leading-out electrodes on the positions subjected to the nickel plating treatment.

Performance testing and comparison

The following index tests were carried out on the heat-generating bodies obtained in the preparation examples and comparative preparation examples:

(1) resistivity: and testing by adopting a four-probe resistance meter.

(2) And the heating rate: supplying 15W power supply to electrode parts at two ends of the heating element, testing the position 10mm away from the electrodes by using a thermocouple tester, recording the temperature value every 0.1 second until the test of 30S is finished, and converting the temperature change value in 30S into the temperature rise speed serving as a parameter;

(3) and testing temperature uniformity: 15W of power supply is provided for the electrode parts at the two ends of the heating element, the temperature of the heating element positions which are 10mm, 15mm and 20mm away from the electrodes is respectively tested by a thermocouple tester, and the uniformity is considered to be good within 10 ℃ of the temperature difference between the average temperature and the temperature.

(4) And fracture toughness: according to a unilateral pre-crack beam forming method (SEPB), a crack with the length of L is prefabricated on the surface of a sample to be tested through a bridge pressing method, the maximum load Pt during the unstable propagation of the crack is obtained through a three-point bending test, and the tested fracture toughness value is obtained according to a corresponding formula;

TABLE 1 Heat-generating body sample Properties of preparation examples and comparative preparation examples

From the data in the above table, it can be seen that the heating element of the embodiment of the present invention is conductive as a whole, and compared with the surface conduction condition of sample X of preparation example 1, the temperature distribution of the heating element is more uniform and uniform, and the local over-high or over-low temperature condition does not occur in the heating process. In addition, the heating element provided by the embodiment of the invention has higher fracture toughness and is not easy to break, so that the reliability of the product is better and the service life is longer.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A heating assembly for an aerosol-generating device comprising a controller, a power supply in electrical connection with the controller, and a heating element,

the heating element comprises an integrally conductive aerosol generating substrate heating body for heating the aerosol forming substrate to generate aerosol, and an electrode arranged on the heating body, and the heating body is electrically connected with the controller through the electrode.

2. The heating assembly of claim 1, wherein the electrode further has a protruding pin, the heating element being electrically connected to the controller via the electrode pin.

3. The heating module as claimed in claim 1, wherein the raw material components of the heat generating body include a matrix powder, a metal powder, a high temperature binder phase substance powder.

4. The heating element according to claim 3, wherein the matrix powder accounts for 80-92.5% by mass of the heating element, the metal powder accounts for 5-15% by mass of the heating element, and the high-temperature binder phase substance powder accounts for 2.5-5% by mass of the heating element.

5. The heating assembly of claim 3, wherein the matrix powder is an oxide powder, a nitride powder, and/or a carbide powder.

6. The heating assembly of claim 5, wherein the oxide powder is ZrO₂、Al₂O₃Or SiO₂At least one of (1).

7. The heating assembly of claim 5, wherein the nitride powder is at least one of SiN, TiN, and AlN.

8. The heating element of claim 5, wherein the carbide powder is at least one selected from powdered SiC, TiC, and AlC.

9. The heating assembly of claim 3, wherein the metal powder is selected from elemental transition metal powders or metal alloy powders.

10. The heating element according to claim 9, wherein the metal powder is selected from the group consisting of metal Ag, Co, Ti, Cu, Pt, Mo, Ni, Cr or W powders or alloy powders.

11. The heating assembly of claim 3, wherein the high temperature binder phase substance powder is a glass phase substance powder.

12. The heating element of claim 11, wherein the glass phase substance powder is selected from SiO₂、Al₂O₃、CaO、B₂O₃、Bi₂O₃At least one of the powders.

13. The heating element as claimed in claim 3, wherein the particle size of the matrix powder, the metal powder, and the high temperature binder phase substance powder is 1 to 20 μm.

14. The heating assembly as set forth in claim 1, wherein the heat generating body is made in a method comprising the steps of:

preparing materials: weighing matrix powder, metal powder and high-temperature bonding phase substance powder, and uniformly mixing;

grinding materials: putting the mixed raw material powder into a grinding machine for grinding;

drying to form a blank: drying the ground raw materials, adding a forming agent, uniformly mixing, and preparing into a blank body through a die in a dry pressing, tape casting or extrusion mode;

sintering and forming: and (4) moving the blank into a sintering furnace for normal pressure or hot-pressing sintering, and cooling along with the furnace to obtain the heating element.

15. The heating assembly of claim 14, wherein the forming agent is at least one of paraffin, tung oil, polyethylene glycol, polyvinyl alcohol, or polymethyl cellulose.

16. The heating element according to claim 1, wherein the heating element has a resistivity of 5 μ Ω · m to 5000 μ Ω · m.

17. The heating element as set forth in claim 16, wherein the heat generating body has a resistivity of 10 μ Ω · m to 1000 μ Ω · m.

18. A heating assembly as claimed in claim 1, in which the heating element is a cartridge open at both ends, the interior of the cartridge being for receiving an aerosol-forming substrate; two ends of the cylindrical body are respectively provided with one electrode, and the polarities of the two electrodes are opposite.

19. A heating assembly as claimed in claim 1, in which the body comprises at least two sequentially connected cartridges open at both ends, the interior of the at least two cartridges being adapted to receive the aerosol-forming substrate; in the at least two cylindrical bodies, one electrode is arranged at the joint between two adjacent cylindrical bodies, one end of the first cylindrical body, which is far away from the cylindrical body adjacent to the first cylindrical body, is provided with one electrode, one end of the last cylindrical body, which is far away from the cylindrical body adjacent to the last cylindrical body, is provided with one electrode, and the polarities of the two adjacent electrodes are opposite.

20. A heating assembly as claimed in claim 19, in which the at least two cartridges are independently operable to enable staged heating of the aerosol-forming substrate.

21. A heating assembly as claimed in claim 1, in which the heating body is a sheet-like body for partial or full insertion into the interior of an aerosol-forming substrate; the sheet body is provided with at least one through groove penetrating through the front surface and the back surface of the sheet body, the through groove extends along the axial direction of the sheet body, one end of the through groove extends to the first end of the sheet body, the other end of the through groove is close to the second end of the sheet body, the first end of the sheet body is provided with one electrode on each of two sides of each through groove, and the polarities of the two adjacent electrodes are opposite.

22. A heating assembly as claimed in claim 21, in which the second end of the sheet-like body is formed with a pointed end to facilitate insertion of the sheet-like body into the interior of an aerosol-forming substrate.

23. The heating assembly of claim 21, wherein the through slot is filled with an insulating substance.

24. A heating assembly as claimed in claim 21, in which the body further comprises a body or cup, the body being received partially or wholly within the body or cup, the body or cup having an internal cavity for receiving the aerosol-forming substrate; the sheet heating element is used for being partially or completely inserted into the aerosol forming substrate, two ends of the cylinder body or the cup body are respectively provided with one electrode, and the two electrodes are opposite in polarity.

25. A heating assembly as claimed in claim 1, in which the heating body is a needle for partial or full insertion into the interior of an aerosol-forming substrate; the needle-shaped body is provided with a through groove penetrating through the outer peripheral surface of the needle-shaped body, the through groove extends along the axial direction of the needle-shaped body, one end of the through groove extends to the first end of the needle-shaped body, the other end of the through groove is close to the second end of the needle-shaped body, the first end of the needle-shaped body is provided with one electrode on each of two sides of the through groove, and the two electrodes are opposite in polarity.

26. A heating assembly as claimed in claim 25, in which the second end of the needle is pointed to facilitate insertion of the needle into the interior of the aerosol-forming substrate.

27. The heating assembly of claim 25, wherein the through slot is filled with an insulating substance.

28. A heating assembly as claimed in claim 25, in which the body further comprises a barrel or cup, the body being received partially or wholly within the barrel or cup, the interior of the barrel or cup being for receiving the aerosol-forming substrate; the needle-shaped body is used for being partially or completely inserted into the aerosol-forming substrate, two ends of the cylinder body or the cup body are respectively provided with one electrode, and the two electrodes are opposite in polarity.

29. A heating assembly as claimed in claim 1, in which the heating element is a cup open at one end, the interior of the cup being for receiving the aerosol-forming substrate; two ends of the cup-shaped body are respectively provided with one electrode, and the polarities of the two electrodes are opposite.

30. A heating assembly as claimed in claim 29, in which the base of the cup is provided with a vent.

31. The heating assembly of claim 1, wherein the electrode is a low resistivity metal alloy material provided to the heat-generating body in a brazed or caliper-fastened manner.

32. The heating assembly of claim 31, wherein the low resistivity metal alloy material piece has a resistivity greater than 0 μ Ω -m and less than 0.11 μ Ω -m.

33. An aerosol-generating device comprising a heating assembly as claimed in any of claims 1 to 32.