Susceptor and method of manufacturing the same, aerosol article

Abstract

The present application provides a susceptor for inductively heating an aerosol generating substrate, a preparation method of the susceptor, and an aerosol generating article comprising the susceptor; the susceptor comprises a single alloy prepared by smelting iron, nickel and zircon as main element raw materials, has a Curie temperature of 300-600 DEG C, and the initial magnetic permeability of the alloy presents a peak characteristic with the increase of temperature. The single layer structure susceptor of the single alloy material of the present application realizes the functions of heating and temperature control at the same time, and overcomes the defects of the prior art, such as complex process, high preparation cost, and limited compatibility of electromagnetic induction heating appliances. Meanwhile, the susceptor has a relatively wide magnetic performance variation window and an aerosol generating system performance variation window, and can be flexibly adapted to more aerosol generating substrates.

Description

TECHNICAL FIELD

[0001] The present application relates to susceptors for inductively heating aerosol- generating substrates, methods of manufacturing the susceptors, and aerosol articles comprising the susceptors, and belongs to the technical field of aerosol generation. BACKGROUND

[0002] Aerosol-generating systems based on inductively heating aerosol-generating substrates are generally known in the art, the aerosol-generating substrates being capable of forming an inhalable aerosol upon heating. To heat the aerosol-generating substrates, the aerosol articles are placed within a receiving cavity of an electromagnetic induction heating appliance. The electromagnetic induction heating appliance can be a heating device comprising an induction coil configured in a pattern to generate a high frequency alternating electromagnetic field, which can form an eddy current in a susceptor. The susceptor itself can be a part of the aerosol article and is arranged in thermal proximity or direct physical contact with the aerosol-generating substrate to be heated, which is heated by the eddy current generating Joule heat under the action of the high frequency alternating electromagnetic field. The aerosol-generating substrate can be an ordered tobacco cut filler, a disordered tobacco cut filler, but also tea leaves, herbal plant granules or powders, all of which are desired to be heated to emit an aerosol for smoking.

[0003] In certain product applications, susceptor assemblies are proposed, which comprise a first susceptor and a second susceptor made of different materials, the assembly having two Curie temperature points. The first susceptor serves a heating function, the second susceptor serves a temperature marker function. To this end, the first susceptor is a first susceptor material having a positive temperature coefficient of resistance, the second susceptor is a material having a negative temperature coefficient of resistance, typically comprising a ferromagnetic or ferrimagnetic material. The electromagnetic induction heating appliance provides a first alternating magnetic field having a first frequency for a first time period, followed by a second alternating magnetic field having a second frequency for a second time period, the first susceptor and the second susceptor providing a functional heating of the aerosol-generating substrate in the magnetic field of different frequencies, respectively.

[0004] The first susceptor and the second susceptor are combined to form a susceptor assembly, which needs to be processed multiple times to form a desired shape, such as a double-layer sheet or a multi-layer sheet after calendering, to be embedded into an aerosol generating article. Regardless of the intended heating and temperature control, the function distribution of the first susceptor for inductive heating and the second susceptor for temperature marking in the prior art is not changed, and the heating or temperature control function cannot be normally implemented in the absence of any susceptor, which greatly hinders the production and manufacturing. The design of such a susceptor assembly is to control the overall thickness of the aerosol generating article to be below 0.10 mm, or even thinner, for example, about 0.06 mm. From the thickness range and the hardness of the material, the susceptor is relatively soft. Among them, it is extremely difficult to press two or more layers of different materials to a thickness of about 0.06 mm.

[0005] In mass production, there are at least the following disadvantages: 1. The preparation process of the multi-layer composite material is relatively complex and requires high precision, and accordingly, the material cost and preparation cost are also high; 2. It has a relatively narrow window of thermal and magnetic physical property changes, that is, it requires high consistency of the change range of the magnetic permeability of the susceptor, the temperature change characteristics and the corresponding coil reaction; 3. It has a relatively narrow window of aerosol generating substrate performance changes, that is, it does not have flexible and universal adaptability to changes in the composition of the aerosol generating substrate material, changes in the water content, different resistance and airflow passage changes; 4. Such a soft material and thin thickness configuration is only suitable for a process flow in which the elongated strip is pre-embedded in the aerosol generating substrate and then cut and segmented, and is not suitable for an assembly process in which the aerosol generating substrate is first formed separately and then inserted into the susceptor one by one. SUMMARY

[0006] The present application provides a susceptor for inductively heating an aerosol generating substrate, which solves the problems in the background art by adopting a single alloy material and a single-layer structure of the susceptor to fully carbonize the aerosol generating substrate.

[0007] The susceptor according to the present application is used for inductively heating an aerosol generating substrate, and comprises a single-layer base alloy formed by a main element raw material, wherein the main element raw material comprises iron, nickel and zirconium, and the weight percentage of each is 2.00-35.00% for iron, 60.00-90.00% for nickel, and 0.40-10.00% for zirconium.

[0008] Preferably, the susceptor further comprises a first additive element raw material of chromium and / or cobalt, which is mixed and melted with the main element raw material to adjust the working temperature reference point of the susceptor to meet the heating requirements of different types of aerosol generating substrates.

[0009] Preferably, the weight percentages of the first additive element raw materials are 0.50-20.00% chromium and 0.50-20.00% cobalt respectively.

[0010] Preferably, the susceptor further comprises a second additive element raw material, which is mixed and smelted with the main element raw material to improve the processing performance or physical properties of the susceptor.

[0011] Preferably, the second additive element raw material includes one or more of aluminum, boron, molybdenum, manganese, copper, titanium, neodymium, magnesium, silicon, carbon, niobium, phosphorus, vanadium, gadolinium, lanthanum, and cerium, and their weight percentages are respectively 0-8.00% of aluminum, 0-7.60% of boron, 0-7.20% of molybdenum, 0-6.00% of manganese, 0-4.20% of copper, 0-3.50% of titanium, 0-2.80% of neodymium, 0-2.20% of magnesium, 0-2.00% of silicon, 0-1.80% of carbon, 0-1.50% of niobium, 0-1.00% of phosphorus, 0-0.90% of vanadium, 0-0.80% of gadolinium, 0-0.60% of lanthanum, and 0-0.50% of cerium.

[0012] The susceptor proposed in the present invention is configured as a single alloy body. The initial magnetic permeability of the susceptor exhibits a peak characteristic as the temperature increases in the range from room temperature (20°C) to the Curie temperature point. The initial magnetic permeability of the susceptor at room temperature (20°C) is not higher than 20,000 gauss / oersted.

[0013] Preferably, the peak characteristic comprises a single-peak characteristic curve, and the stable operating temperature of the susceptor is on the right side of the peak and close to the peak.

[0014] Preferably, the peak characteristic comprises a double-peak characteristic curve having a first peak and a second peak, and the stable operating temperature of the sensor is on the right side of the first peak and close to the first peak, or works on the right side of the second peak and close to the second peak.

[0015] Preferably, the resistivity of the sensor is 2-30x10 -8 Ωm(20℃).

[0016] Preferably, the Curie temperature of the susceptor is between 300-600°C.

[0017] Preferably, the susceptor is configured in a geometric shape to be combined with the aerosol generating substrate for generating eddy currents to induce heating.

[0018] Preferably, the geometric shape includes any one of a sheet shape or a deformation thereof, a sphere shape or a deformation thereof, a column shape or a deformation thereof, a spring shape, a paper clip shape or a deformation thereof, a mesh plate shape or a perforated plate shape.

[0019] Preferably, the susceptor is an elongated sheet with a thickness of 0.04-0.25mm.

[0020] Preferably, the susceptor is an elongated column with a diameter of 0.5-3.5mm.

[0021] The present application also provides a method for preparing the susceptor, which is used for mass production of the aforementioned susceptor, comprising the following steps:

[0022] S1: placing the element raw materials in the furnace according to the weight percentage, and then performing vacuum smelting at a temperature range of 1300-2000℃;

[0023] S2: performing secondary electroslag remelting smelting and vacuum consumable on the mixed material after vacuum smelting, and cooling and solidifying to form an alloy ingot;

[0024] S3: performing tempering treatment on the alloy ingot above the crystallization temperature, and then removing the impurities and hole layer on the outer surface, and hot forging and hot pressing into an alloy plate;

[0025] S4: performing cold rolling treatment on the alloy plate to press into a preset thickness.

[0026] The present application provides an aerosol product that can be inductively heated, comprising an aerosol generating substrate and the aforementioned susceptor, the susceptor being configured in the aerosol generating substrate, and the susceptor being used for inductively heating the aerosol generating substrate under the action of a high-frequency alternating magnetic field.

[0027] The present application has the following beneficial effects: the susceptor of a single alloy material has only a single-layer structure and a single Curie temperature point, is simple to configure, can simultaneously realize heating and temperature control functions, and overcomes the defects of the prior art, such as complex process, high preparation cost, and limited compatibility of electromagnetic induction heating devices. At the same time, the susceptor of a single alloy material has a relatively wide magnetic performance change window and an aerosol generating system performance change window, and can be flexibly adapted to more conditions of the aerosol generating substrate. By adjusting the formula components of the alloy, a susceptor with different Curie temperatures can be formed, so that it can be applied to different temperature scenarios of the aerosol generating substrate. In addition, by configuring different sizes and selecting whether to perform annealing softening treatment on the material, a susceptor with different strength characteristics can be obtained, which can be flexibly applied to different aerosol product process flows, including the pre-embedded mixing of the susceptor and the aerosol generating substrate and then cutting and segmenting, and the subsequent formation of the susceptor after the aerosol generating substrate is shaped. The aerosol product provided by the present application can uniformly and effectively release aerosol components and aroma, and provide a user with a good experience of low-temperature heating, full smoke density, and sufficient throat impact. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described in the following are only part of the embodiments of the present application, and for those skilled in the art, other drawings obtained without creative labor should be included in the technical solutions of the present application.

[0029] Figure 1 The schematic diagram of the single-peak characteristic curve of the susceptor of the present application.

[0030] Figure 2 The schematic diagram of the double-peak characteristic curve of the susceptor of the present application.

[0031] Figure 3 The schematic diagram of the sheet-shaped structure susceptor of the present application.

[0032] Figure 4 The schematic diagram of the spherical structure susceptor of the present application.

[0033] Figure 5 The schematic diagram of the columnar structure susceptor of the present application.

[0034] Figure 6 The schematic diagram of the spring-like structure susceptor of the present application.

[0035] Figure 7 The schematic diagram of the paper-clip-like structure susceptor of the present application.

[0036] Figure 8 The schematic diagram of the mesh-plate-like structure susceptor of the present application.

[0037] Figure 9 The schematic diagram of the cylindrical structure susceptor of the present application.

[0038] Figure 10 The schematic diagram of the plate-like structure susceptor of the present application.

[0039] Figure 11 The slice microstructure diagram of the alloy in the casting state of the preset formula.

[0040] Figure 12 The slice microstructure diagram of the alloy in the forging state of the preset formula.

[0041] Figure 13 The slice microstructure diagram of the alloy in the finished product state of the preset formula.

[0042] Figure 14 The before-and-after effect comparison diagram of the aerosol product comparative experiment one.

[0043] Figure 15 The before-and-after effect comparison diagram of the aerosol product comparative experiment two.

[0044] Figure 16 The front and rear effect comparison chart of the aerosol product comparison experiment three.

[0045] Figure 17 The front and rear effect comparison chart of the aerosol product comparison experiment four. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only one of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0047] In combination with the interaction among the raw material elements and the possibility of forming different metallographies, the present application provides a single alloy susceptor of a Fe-Ni-Zr-based alloy taking iron, nickel and zirconium as main elements, with the weight percentage of iron being 2.00-35.00%, nickel being 60.00-90.00%, and zirconium being 0.40-10.00%.

[0048] The basic material of the single alloy susceptor of the present application can be added with a small amount of other alloying element raw materials to further fine-tune its electrical, magnetic and thermal properties, thereby forming a multi-element alloy. The series of multi-element alloys can be used as a susceptor to couple with the coil in an electromagnetic induction heating appliance, and the initial magnetic permeability μ i With the increase of temperature, a peak value characteristic is presented, i.e. the behavior characteristic of first increasing and then decreasing, and after reaching the stable working temperature, it still continuously has the function of heating in the magnetic field, thereby realizing smooth working. The initial magnetic permeability μ i The initial magnetic permeability μ is the limit value of the magnetic permeability (B / H) of the magnetic material at the beginning of the static magnetization curve (when H tends to 0), and the unit is Gauss / Oersted (Gs / Oe).

[0049] The small amount of other alloying elements that can be added in the Fe-Ni-Zr-based alloy can be the first added elements of chromium and / or cobalt, wherein the weight percentage of iron, nickel and zirconium is iron 2.00-35.00%, nickel 60.00-90.00%, and zirconium 0.40-10.00%, and the weight percentage of the first added element raw material is chromium 0.50-20.00% and cobalt 0.50-20.00%.

[0050] Chromium and cobalt as first additive elements are added to the iron-nickel-zirconium based alloy in proper proportion, so that the alloy after smelting can improve the functional sensitivity of the susceptor, such as temperature sensitivity. On the one hand, it is used to reduce the magnetic permeability of the alloy, and on the other hand, it is used to adjust the control of the heating temperature to meet the heating requirements of different types of aerosol generating substrates. In the present application, the temperature is adjusted according to the chromium and cobalt content / weight percentage, so that the temperature sensitivity meets the requirements.

[0051] The addition of the first additive element chromium and / or cobalt element can further increase the Curie temperature compared to the aforementioned alloy composed of three main elements iron, nickel and zirconium, thereby increasing the working temperature; the reduction of iron content and the increase of cobalt as a substitute material make the initial magnetic permeability of the alloy decrease, thereby reducing the required magnetic permeability inhibiting element zirconium; this embodiment is suitable for aerosol products that require high-temperature release of smoke components.

[0052] Therefore, the mixing and smelting of the first additive element with the main element raw material can adjust the working temperature reference point of the susceptor to meet the heating requirements of different types of aerosol generating substrates.

[0053] A small amount of other alloy elements can be added to the iron-nickel-zirconium (Fe-Ni-Zr) based alloy, which can be a second additive element. The second additive element raw material includes one or more of aluminum, boron, molybdenum, manganese, copper, titanium, neodymium, magnesium, silicon, carbon, niobium, phosphorus, vanadium, gadolinium, lanthanum, cerium, wherein the weight percentage of iron, nickel and zirconium is iron 2.00-35.00%, nickel 60.00-90.00%, zirconium 0.40-10.00%, and the weight percentage of the second additive element is aluminum 0-8.00%, boron 0-7.60%, molybdenum 0-7.20%, manganese 0-6.00%, copper 0-4.20%, titanium 0-3.50%, neodymium 0-2.80%, magnesium 0-2.20%, silicon 0-2.00%, carbon 0-1.80%, niobium 0-1.50%, phosphorus 0-1.00%, vanadium 0-0.90%, gadolinium 0-0.80%, lanthanum 0-0.60%, cerium 0-0.50%.

[0054] The second additive element raw material mixed with the main element raw material for smelting can improve the processing performance or physical properties of the susceptor. On the one hand, the second additive element raw material makes the smelting process smoother, promoting production efficiency, and on the other hand, it further adjusts and improves the performance of the susceptor. The performance of the susceptor includes initial magnetic permeability, Curie temperature, resistivity, thermal conductivity, and other physical properties. Specifically, at least the following benefits are obtained during the processing: removal of harmful components such as sulfur, reduction of segregation, uniform distribution of alloying elements, reduction of brittleness / stress sensitivity during cold and hot working, enhancement of dislocation and lattice distortion to obtain superior processing performance and lower magnetism. The addition of the second additive element raw material can also adjust the Curie temperature and resistivity, improve the thermal conductivity of the susceptor, and make the microstructure more stable. The selective addition of the second additive element raw material improves the physical properties of the susceptor such as magnetism, resistivity, stress brittleness, and hardness, allowing different formulations of the susceptor to have different physical properties to be widely used in different environments with different aerosol generation requirements.

[0055] In the specific embodiment, the Fe-Ni-Zr-based alloy can be added with the first additive element alone, or the second additive element alone, or both the first additive element and the second additive element. The weight percentage of the Fe-Ni-Zr-based alloy is 2.00-35.00% of iron, 60.00-90.00% of nickel, and 0.40-10.00% of zirconium. The weight percentage of the first additive element raw material is 0.50-20.00% of chromium and 0.50-20.00% of cobalt. The weight percentage of the second additive element is 0-8.00% of aluminum, 0-7.60% of boron, 0-7.20% of molybdenum, 0-6.00% of manganese, 0-4.20% of copper, 0-3.50% of titanium, 0-2.80% of neodymium, 0-2.20% of magnesium, 0-2.00% of silicon, 0-1.80% of carbon, 0-1.50% of niobium, 0-1.00% of phosphorus, 0-0.90% of vanadium, 0-0.80% of gadolinium, 0-0.60% of lanthanum, and 0-0.50% of cerium.

[0056] The method for measuring the aforementioned weight percentage is a prior art, and various technical means such as chemical composition analysis, spectral analysis, mass spectrometry, chromatography analysis, and X-ray atomic energy spectrum can accurately identify the content of the base alloy raw material element, the first additive raw material element, and the second additive raw material element.

[0057] The single alloy susceptor formed based on the Fe-Ni-Zr-based alloy has a low initial magnetic permeability at room temperature (20°C), which is not higher than 20000 Gauss / Oersted, and the preferred range is between 2000-10000 Gauss / Oersted. Such material properties do not cause a sharp change in thermal and magnetic physical quantities during temperature changes, which is not conducive to setting the window for anti-counterfeiting identification and control.

[0058] Single alloy susceptor formed on the basis of iron nickel zirconium (Fe-Ni-Zr) based alloy, its initial magnetic permeability μ i With the increase of temperature T, it shows peak characteristics, that is, it has the behavior characteristics of first increasing and then decreasing. After reaching the stable working temperature, it still has the function of heating in the magnetic field, and realizes smooth work. The peak characteristics can be single peak characteristic curve or double peak characteristic curve. The susceptor stable working temperature is on the right side of the peak and near the nearest peak.

[0059] The initial magnetic permeability μ i It can have a single peak characteristic. The single peak characteristic has a single peak characteristic curve, as shown in Figure 1 , wherein the susceptor stably works on the right side of the initial magnetic permeability peak M point and near the B point where it decreases, and the corresponding working temperature is T b . T b Close to the highest magnetic permeability μ1 corresponding temperature T m , less than and far away from the Curie temperature T c .

[0060] The initial magnetic permeability μ i It can also have a double peak characteristic. The double peak characteristic has a double peak characteristic curve, as shown in Figure 2 , wherein the susceptor stable working temperature is on the right side of the first peak M1 point and near the B1 point (corresponding working temperature T b1 ) where it decreases, or on the right side of the second peak M2 point and near the B2 point (corresponding working temperature T b2 ) where it decreases. m1 Close to the first peak M1 point T m2 Close to the second peak M2 point T m2 .

[0061] Whether it has a single peak characteristic or a double peak characteristic, the Curie temperature of the single alloy susceptor is in the temperature range of 300-600℃. In actual application, the initial magnetic permeability change behavior of the susceptor conforms to the characteristics described above, so that the susceptor can be in the initial magnetic permeability performance change window preset by the oscillation control circuit, and reach thermal equilibrium under the condition of dynamic adjustment of the coil power input duty cycle, to realize smooth work.

[0062] The principle of eddy current effect is used to form induced current on the surface of the susceptor in a changing magnetic field. The longer the outer circumference of the susceptor, the higher the frequency of the alternating magnetic field, and the greater the eddy current; the smaller the resistivity of the susceptor, the greater the eddy current, the greater the eddy current, the greater the Joule heat generated per unit time, and the faster the temperature rising rate of the aerosol generating substrate during heating, and the better the heating effect. Therefore, in the alloy design of the present application, a base metal element with small resistivity such as iron, nickel and zirconium is used, more preferably, trace amounts of alloying elements such as manganese, silicon, molybdenum, rare earth and the like are used, and the content of impurities such as carbon, phosphorus and sulfur is controlled, to obtain a series of multi-element alloys with resistivity between 2-30x10 -8 Ωm(20℃), so as to obtain an alloy material with strong eddy current effect.

[0063] The susceptor has a small resistivity near the Curie temperature, which enables the susceptor to provide maximum heating efficiency near the peak of magnetic permeability before reaching the Curie temperature, whether in a single-peak characteristic curve or a double-peak characteristic curve, and can be operated stably to the expected working temperature. In a more optimized embodiment, the first additive element chromium and cobalt are added to the base metal elements such as iron, nickel and zirconium to adjust the working temperature as needed.

[0064] The susceptor of the present application has a small resistance change rate near the Curie temperature, that is, the resistance change rate is small near the Curie temperature T c , preferably, the resistance-temperature curve of the susceptor has a small resistance change rate in the temperature range of ±20℃ near the Curie temperature during the preheating period from room temperature.

[0065] The susceptor of the present application has a low resistivity of 2-30x10 -8 Ωm(20℃), under which condition the speed of eddy current effect is faster and the heating speed is faster.

[0066] The susceptor for heating an aerosol generating substrate of the present application has a Curie temperature of less than 600℃, and preferably a Curie temperature of 300-600℃. The initial magnetic permeability of the susceptor is low at room temperature, and when there is no external magnetic field, the arrangement direction of the magnetic domains is chaotic and the overall external magnetic property is weak. When an external magnetic field acts on the susceptor, the magnetic domains rotate along the direction of the magnetic field, strengthening the magnetic field inside the susceptor. With the strengthening of the external magnetic field, more and more magnetic domains rotate to the direction of the external magnetic field, and the magnetic induction intensity in the same direction of the external magnetic field becomes stronger. The stability of the magnetic domains at different temperatures is different, and below the Curie temperature, the higher the temperature, the easier the magnetic domains rotate. Therefore, as the temperature rises, the magnetic permeability of the alloy rises, and when the temperature rises to a certain temperature, the magnetic permeability reaches a peak, such as Figure 1M1 point in the graph. However, as the temperature further increases, the magnetic permeability begins to decrease again, because the increased thermal motion of the metal's internal lattice affects the ordered arrangement of the magnetic domain moments. When the temperature reaches a point sufficient to completely destroy the ordered arrangement of the magnetic domain moments, the average magnetic moment becomes zero, the magnetic properties of the ferromagnetic substance disappear, and it becomes paramagnetic, i.e., loses its magnetic properties. The temperature point corresponding to the complete disappearance of ferromagnetism is called the Curie temperature, corresponding to Figure 1 T c1 .

[0067] In the present application, some of the second additive elements exist in the soft magnetic alloy in the form of interstitial or substitutional solid solution, causing lattice distortion and causing micro stress to hinder the free movement of the domain wall. Some of the elements can also combine with carbon, nitrogen, and oxygen to form compounds, and the inclusion of these impurity compounds pins the domain wall, thereby increasing the coercivity and reducing the magnetic permeability, which is beneficial for the specific application of the inductor in the aerosol generating system.

[0068] The single-alloy inductor provided by the present application has a Curie temperature generally between 300-600℃, which is suitable for the low-temperature heating of aerosol products to achieve effective heating and produce a rich aerosol. For different heat-not-burn aerosol products, the required working temperature of the inductor is different. For example, the maximum heating temperature of some granular herbal nicotine-containing aerosol products may only need to reach 320℃, the maximum heating temperature of some sheet-shaped tobacco aerosol products may need to reach 340℃, and the maximum heating temperature of some powdered herbal nicotine-free aerosol products may need to reach 360℃. Accordingly, the working temperature of the inductor is defined as low (300-320℃), medium (321-340℃), and high (341-360℃) in the present application. The present application sets that, for single-peak characteristic alloys, the Curie temperature T c is about 100℃ away from the working temperature T b ; for double-peak characteristic alloys, the Curie temperature T c2 is about 200℃ away from the possible first working temperature T b1 , and about 100℃ away from the possible second working temperature T b2 . Based on these values, the present application adjusts the Curie temperature of the alloy to prepare inductors with different working temperatures.

[0069] The single-alloy inductor of the present application is preferably in the shape of a strip or sheet, with a thickness in the range of 0.04-0.25mm, preferably 0.08-0.15mm.

[0070] The susceptor must be relatively thin relative to its specific skin depth, which depends on the excitation frequency, so that the majority of the magnetic field establishes eddy currents within the susceptor, generating heat. As the susceptor thickness increases, the magnetic field cannot penetrate deeply enough into the material, requiring an undesirable amount of additional energy to heat the increased thermal mass of the susceptor. If the susceptor layer is too thin, for example, less than the skin depth, inefficiency in converting the magnetic field into heat via eddy currents will occur. Furthermore, a very thin susceptor has low mechanical strength, which affects its manufacturability for insertion and attachment into an aerosol-generating substrate. If the susceptor layer is too thick, high conversion efficiency is achieved, but the thermal load, i.e., the mass, of the susceptor increases significantly, which reduces the rate of temperature rise. Therefore, considering the heating rate and mechanical strength of the susceptor, the thickness of a single alloy susceptor is selected to be between 0.04-0.25 mm, preferably between 0.08-0.15 mm.

[0071] In some embodiments, the single alloy susceptor of the present invention can be processed into different geometric shapes according to the needs of the aerosol generating substrate, such as thin sheets, spheres, columns, springs, paper clips, meshes, cylinders, and plates.

[0072] like Figure 3 The following illustrates an embodiment of a sheet-shaped susceptor. Its length, width, and thickness are 6.0-20.0 mm, 2.3-6.8 mm, and 0.04-0.25 mm, respectively, and preferably 9.0-12.0 mm, 3.5-4.5 mm, and 0.06-0.15 mm. When a sheet-shaped susceptor is formed into a V-shaped or N-shaped structure, it can be inserted into an aerosol product with greater strength. Compared to a flat sheet, a V-shaped or N-shaped structure with curved supports can withstand greater external forces.

[0073] like Figure 4 The illustrated embodiment of a spherical susceptor is shown. It is preferably spherical, with a diameter of 0.2-2.5 mm, preferably 0.8-1.5 mm. When deformed into an ellipsoidal structure, its major and minor axes are 0.2-2.5 mm and 0.2-2.0 mm, respectively. The major and minor axes are preferably 0.8-1.5 mm and 0.5-1.2 mm, respectively. The spherical susceptor can also be deformed into a small, pie-like, granular structure, with a height of 0.2-2.0 mm, preferably 0.5-1.2 mm.

[0074] like Figure 5 FIG. a shows an embodiment of a cylindrical sensor. When cylindrical, its length and diameter are 0.8-2.5 mm and 0.3-2.0 mm, respectively. Preferably, its length and diameter are 1.0-1.5 mm and 0.5-1.0 mm, respectively. Figure 5The b figure in the figure shows an embodiment of a round rod structure, wherein the length and diameter are 6.0-20.0 mm and 0.5-3.5 mm respectively, and the length and diameter are preferably 9.0-12.0 mm and 1.0-2.5 mm respectively. Figure 5 Figure c shows an irregular tip columnar structure embodiment, the length and diameter of the circular segment are preferably 1.0-1.5 mm and 0.5-1.0 mm respectively. Figure 5 Figure d shows an embodiment of a pointed round rod structure, whose length and diameter are 6.0-20.0 mm and 0.5-3.5 mm respectively, and preferably 9.0-12.0 mm and 1.0-2.5 mm respectively.

[0075] like Figure 6 In the embodiment of the spring-shaped circular spring structure shown in FIG. a, its length, overall outer diameter and wire diameter are 6.0-20.0 mm, 2.3-6.8 mm and 0.1-2.5 mm, preferably 9.0-12.0 mm, 4.0-5.0 mm and 0.5-2.0 mm. Figure 6 Figure a shows an embodiment of a flat spring structure, in which the wire thickness, wire width, working aperture and free height are 0.1-0.8 mm, 0.3-0.8 mm, 2.3-6.8 mm and 6.0-20.0 mm, respectively, and preferably 0.15-0.5 mm, 0.35-0.5 mm, 4.0-5.0 mm and 9.0-12.0 mm.

[0076] like Figure 7 When the paper clip structure embodiment is shown in Figure a, the length, width and diameter of the main body are 6.0-20.0mm, 2.3-6.8mm and 0.05-3.0mm, preferably 9.0-12.0mm, 3.5-4.5mm and 0.1-2.0mm. Figure 7 Figure b shows an embodiment of a wavy structure, in which the main body length, width and diameter are 6.0-20.0 mm, 2.3-6.8 mm and 0.05-3.0 mm, respectively, preferably 9.0-12.0 mm, 3.5-4.5 mm and 0.1-2.0 mm.

[0077] like Figure 8 In the mesh plate structure embodiment shown in Figure a, the main body length and main body width are 6.0-20.0mm and 2.3-6.8mm, preferably 9.0-12.0mm and 3.5-4.5mm. When the susceptor in the shape of a straight-edge mesh plate or a rough-edge mesh plate is made of thin long wire, the thickness and cross-sectional width of the thin long wire are 0.05-0.2mm and 0.3-2.0mm, preferably 0.08-0.15mm and 0.5-1.0mm. Figure 8FIG. b shows a sensor in the shape of a mesh plate with flush edges or a mesh plate with rough edges made of fine round wires. The diameter of the fine round wires is 0.1-2.0 mm, preferably 0.2-1.5 mm.

[0078] like Figure 9 When the embodiment of the cylindrical shape is shown in FIG. a, its length, outer diameter and wall thickness are 6.0-20.0 mm, 2.3-7.5 mm and 0.04-0.25 mm, preferably 9.0-12.0 mm, 3.0-4.5 mm and 0.05-0.15 mm, respectively. Figure 9 Figure b shows an embodiment of a cylindrical susceptor deformed into a U-shaped structure, wherein the length and width are 6.0-20.0 mm and 1.0-5.0 mm, respectively, preferably 9.0-12.0 mm and 1.5-2.5 mm.

[0079] like Figure 10 In the plate-shaped embodiment shown, its length, width, and thickness are 6.0-20.0 mm, 2.3-6.8 mm, and 0.04-0.25 mm, respectively, and preferably 9.0-12.0 mm, 3.5-4.5 mm, and 0.06-0.15 mm. When the orifice-plate-shaped susceptor has a circular, square, or diamond-shaped orifice structure (not shown), its circular diameter, square side length, or diamond side length are all 0.5-2.5 mm, and preferably 1.0-2.0 mm.

[0080] It should be noted that the above-listed embodiments of the susceptor's existence form can better realize the susceptor heating function. Other variations and improved embodiments are similar to them, so they are not fully listed and described.

[0081] In order to more fully understand the working principle of the receptor of the present invention, the working principle and basic functions of the aerosol product with a receptor combined with a common electromagnetic induction heating device are described in detail below.

[0082] Common electromagnetic induction heating devices on the market have a holding cavity for holding aerosol products, and a coil is arranged around the holding cavity. The coil generates a changing magnetic field through a controller.

[0083] The sensor is placed within the aerosol-generating matrix in the aerosol product and is in thermal contact with it. The end of the aerosol product containing the aerosol-generating matrix is ​​inserted into the holding cavity of the electromagnetic induction heating device. A controller generates a variable magnetic field through the coil surrounding the holding cavity. The electromagnetic induction heating device and the sensor in the aerosol-generating matrix work together to achieve functions such as self-start / stop, anti-counterfeiting verification, induction heating, temperature measurement and control, and mouth count recording.

[0084] Self-starting / self-stopping function of aerosol product with the invented susceptor. In the comfortable use environment, the heating operation is automatically started when the aerosol product is inserted into the cavity of the electromagnetic induction heating appliance, and the control circuit is configured to start the heating operation of the induction heating device in response to detecting the insertion of the product into the cavity. When the aerosol product is accidentally pulled out of the cavity, the control circuit can be configured to respond to the detection of the stop of the heating operation of the device, and the circuit generates a power pulse, especially a detection current pulse, for detecting the extraction of the product.

[0085] Anti-fake check function of aerosol product with the invented susceptor. Since the susceptor with different element compositions has certain different thermal and magnetic physical property characteristics, the control circuit is configured to set a predetermined response detection range in the electromagnetic induction heating appliance in response to detecting the insertion of the product into the cavity of the electromagnetic induction heating appliance, and the susceptor that does not meet the preset physical threshold cannot be normally adapted for use. The change of the thermal and magnetic physical properties during the heating process does not meet the established threshold or multiple target conditions, which will also trigger system error or stop working, which has certain technical threshold for counterfeit aerosol products and universal appliances.

[0086] Induction heating function of aerosol product with the invented susceptor. High-frequency oscillating current drives the coil to generate alternating magnetic field. The common high-frequency oscillation frequency for electromagnetic heating is between about 30 KHz and about 20 MHz. The susceptor receives electromagnetic excitation and generates a large amount of Joule heat due to eddy current effect, so that its temperature rises rapidly. In the process of smoking, the surrounding aerosol generating substrate is heated by contact heat conduction and air flow heat convection.

[0087] Temperature measurement and control function of aerosol product with the invented susceptor. The circuit microcontroller of the electromagnetic induction heating appliance is preprogrammed to monitor and calculate the real-time impedance of the resonant circuit or the change of the power supply current draw. According to the corresponding relationship between these parameters and temperature change, the temperature of the susceptor is accurately monitored, so that the duty cycle of power input is more finely adjusted to accurately control heating, so that the aerosol volatilized by baking has good taste, i.e. moderate and stable temperature, full and stable smoke amount.

[0088] The aerosol product with the invented susceptor has a record function of the number of puffs. When the aerosol product is being puffed by the user, the change of the cold airflow will cause the temperature of the susceptor surface to change, such as the heat taken away by each puff may cause its maximum temperature to drop 10-50℃ instantaneously. The circuit system captures this temperature change and responds in real time to adjust the power input so that its temperature quickly recovers to the preset working temperature required for carbonization of the aerosol product. The change of the electrical characteristics sensed by the circuit in this process is identified as a puff, which is recorded as the number of puffs for setting the same number of puffs and the overall duration of smoking in different puffing modes and habits. Here, carbonization refers to the process of thermal degradation of the aerosol generating substrate under oxygen-poor conditions to produce aerosol.

[0089] When the invented susceptor is inserted into the electromagnetic induction heating appliance cavity together with the aerosol product, the susceptor and the coil are coupled, causing the inductance of the circuit system to increase X nanohenries. During operation, the inductance of the circuit system fluctuates due to temperature fluctuations or changes in the relative position of the susceptor and the coil, etc. If this fluctuation reaches 20% of X, it can be detected by the electronic circuit system. When the detection circuit determines that the fluctuation exceeds the preset condition, the duty cycle of the input power is precisely adjusted by the controller to control the heat generation of the susceptor. Here, X is 0.5-300 nanohenries, preferably 5-50 nanohenries, and the preferred condition is at a frequency of 6MHz.

[0090] The following describes the steps of the preparation method of the susceptor:

[0091] 1) Vacuum smelting step: place the raw materials in the proportion of weight percentage into a flat furnace, arc furnace, induction furnace, vacuum smelting furnace, intermediate frequency furnace or power frequency furnace for smelting, and then perform vacuum (or in a protective gas) smelting at a temperature range of 1300-2000℃ to reduce oxidation;

[0092] 2) Electroslag remelting step: the mixed material after vacuum smelting is subjected to secondary electroslag remelting and vacuum consumable to remove impurities, improve metal purity, and improve the microstructure of solidification and crystallization;

[0093] 3) Component analysis step: after the mixed material treated in step 2) is cooled and solidified to form an alloy ingot, a sample is taken for plasma-induced coupled optical spectrum analysis to confirm the chemical composition;

[0094] 4) Tempering, general turning and skinning step: above the crystallization temperature, i.e. between 650-900℃, the alloy ingot formed in step 3) is subjected to tempering treatment to allow its grain to grow, and the alloy is changed to a soft state material for subsequent processing, and then the impurities and hole layer on the outer surface of the alloy ingot after tempering treatment are turned off by a lathe;

[0095] 5) forging step: the alloy ingot treated in step 4) is subjected to a forging treatment under high temperature to form a large deformation, refine the grain size, and further improve and stabilize the microstructure of the material;

[0096] 6) hot rolling step: the alloy ingot after high-temperature forging is hot rolled into a plate convenient for cold rolling;

[0097] 7) cold rolling step: the above plate is subjected to cold rolling treatment such as rough rolling, medium rolling and finish rolling in sequence, the product grain is crushed, and the alloy ingot material is pressed into a thin plate;

[0098] 8) longitudinal shearing and packaging step: the thin plate is subjected to longitudinal shearing treatment, and various thin sheets formed by longitudinal shearing are subjected to packaging treatment to obtain various susceptors.

[0099] It needs to be further explained that the embodiment measures the initial magnetic permeability of the alloy prepared into a standard sample at room temperature (20°C), and the initial magnetic permeability of part of the series of alloys meets the preset range of the application, and the initial magnetic permeability of part of the series of alloys does not meet the requirement and needs to be subjected to constant-current magnetization treatment. The alloy thin strip material with different thicknesses is cut into the required shape and size by mechanical stamping or laser cutting, and can be used as a single susceptor.

[0100] In view of the fact that in part of the embodiments, the raw material ratio may be optimal, so that multiple finish rolling and peeling are not required, and thus the following method can be simplified:

[0101] S1: the element raw materials are taken by weight percentage and placed in a furnace for smelting, and then vacuum smelting is performed at a temperature range of 1300-2000°C;

[0102] S2: the mixed material after vacuum smelting is subjected to secondary electroslag remelting and vacuum consumable smelting, and is cooled and solidified to form an alloy ingot;

[0103] S3: the alloy ingot is subjected to tempering treatment above the crystallization temperature, and then the impurities and hole layer on the outer surface are removed, and the alloy body plate is hot pressed by high-temperature forging;

[0104] S4: the alloy body plate is subjected to cold rolling treatment and is pressed into a preset thickness.

[0105] The susceptor prepared by the above method has a low initial magnetic permeability at room temperature (20°C), which is generally not higher than 20000 Gauss / Oersted, and is commonly between 2000-10000 Gauss / Oersted. Such material characteristics do not cause a sharp change in thermal and magnetic physical properties during temperature change, which is not conducive to setting the window of anti-counterfeiting identification and control.

[0106] The Curie temperature of the susceptor is between 300-600°C, which is just suitable for low temperature heating of the aerosol product to achieve effective aerosol.

[0107] The microstructure of the alloy in the preset formula in the cast state is shown in FIG. 1, and the microstructure of the alloy in the forged state is shown in FIG. 2. Figure 11 Figure 12 By comparing the two microstructure diagrams, it can be seen that there is a significant difference in grain morphology and size. During forging, although the grains grow above the recrystallization temperature, the mechanical process of forging will crush and become smaller. The overall result is that the grains are refined after physical change, the grain boundaries increase significantly, and the obstacles to the passage of magnetic lines increase, thereby causing the magnetic permeability to decrease significantly. This lower initial magnetic permeability is one of the characteristics required in practical applications.

[0108] After repeated tests and testing of a large amount of data, the following feasible formula in Table 1 is obtained:

[0109] Table 1

[0110]

[0111] In another embodiment, the alloy contains the following element raw material ratio in Table 2:

[0112] Table 2

[0113] Element Raw Material Fe Ni Cr Co Zr C Ti P Nb La Weight Percentage wt% 9.60 80.37 1.30 3.40 1.50 1.60 1.50 0.20 0.50 0.01

[0114] The microstructure of the finished product state of the alloy after multiple forging, annealing and rolling is shown in FIG. 3. The microstructure is similar to that of the previous embodiments, except that the grain size is further refined. Therefore, it is not repeated here. It can be understood that other feasible element weight ratio schemes have similar composition structures and can achieve similar induction heating and control effects. Figure 13

[0115] The preparation method of the susceptor is described by taking a plate as an example. The plate can be further processed into a sheet-shaped, mesh-shaped susceptor. Using the manufacturing method of seamless steel pipes, the plate can be further processed into a tubular material, which is cut into a cylindrical susceptor.

[0116] The preparation methods of the spherical, cylindrical, spring-shaped, and U-shaped susceptor embodiments are the same as steps 1-5 of the previous methods. After the alloy ingot is forged in step 5, the alloy ingot is made into a wire with a suitable outer diameter, and then further processed into a spherical, cylindrical, spring-shaped, or U-shaped susceptor.

[0117] ​​In some embodiments, a single alloy susceptor formed of an iron-nickel-zirconium (Fe-Ni-Zr) based alloy is provided, which is made into a thin sheet shape for insertion into an aerosol product, and is subjected to a smoking experiment by a commonly used electromagnetic induction heating device.

[0118] Iron, nickel, and zirconium are provided in a weight ratio of 16.00% iron, 79.00% nickel, and 5.00% zirconium, and are made into an elongated strip-shaped susceptor with a length of 12 mm, a width of 4.2 mm, and a height of 0.12 mm according to the aforementioned preparation method 1-8.

[0119] The single alloy susceptor formed of the above-mentioned formula has a Curie temperature of about 430°C, and a corresponding working temperature of about 330°C, which is suitable for the heating requirements of most thin sheet-shaped tobacco aerosol products, and can quickly release an appropriate amount of aerosol smoke, which is a moderate heating medium-temperature implementation method.

[0120] The susceptor has the following basic characteristics: a high initial magnetic permeability at room temperature (20°C) due to the high content of iron and nickel, which makes it easy to be recognized by an electromagnetic induction heating device; a low resistivity, strong eddy current effect, and fast heating; and a high zirconium content, which limits the Curie temperature and suppresses the sensitivity of the magnetic permeability to temperature changes, i.e., the change rate is small and the absolute difference is small within a certain temperature change range.

[0121] A commonly used aerosol product with an ordered arrangement of thin sheet-shaped aerosol generating substrates is provided, and the elongated strip-shaped susceptor with a length of 12 mm, a width of 4.2 mm, and a height of 0.12 mm is inserted into the aerosol generating substrate near the axial center of the aerosol product; then the aerosol product is inserted into a commonly used electromagnetic induction heating device for self-starting / self-stopping, anti-fake verification, induction heating, temperature measurement and control, and recording of the number of puffs.

[0122] Due to the limitations of the thermocouple contact method in the smoking experiment, the infrared non-contact method is used in the series of experiments to calibrate the temperature in the following two aspects.

[0123] The method for characterizing the working temperature of the susceptor is as follows: the susceptor is fixed on a cylindrical carrier with a diameter corresponding to the outer diameter of the aerosol product, and then the two are inserted into an electromagnetic induction heating appliance placed vertically, the carrier is fixed at the bottom of the containing cavity, and this state without aerosol product is defined as the "empty load" state, and then the electromagnetic induction heating appliance is started to heat, and the temperature change of the susceptor is recorded by an infrared temperature measuring instrument from the top of the containing cavity, and the highest temperature point is taken when the temperature reaches a substantially stable state, which is marked as the working temperature of the susceptor. The present application assumes that in actual smoking application, the highest temperature of the susceptor when it is stably working in the aerosol generating substrate is equivalent to the temperature marked in the empty load state.

[0124] The average temperature of the human body inlet aerosol is defined as follows: the temperature of the outer surface of the combination of the aerosol product and the top opening of the containing cavity is tested by an infrared temperature sensor combined with a mobile phone monitoring software, which is defined as the average temperature of the human body inlet aerosol.

[0125] The specific experimental data in the embodiment are shown in Table 3 as follows:

[0126] Table 3

[0127]

[0128] From the experimental data in the above table, it can be seen that the susceptor of the present embodiment can realize the functions of self-starting / self-stopping, anti-fake verification, induction heating, temperature measurement and control, and puff number recording in the commonly used electromagnetic induction heating appliances on the market. From the data in Table 3, it can be seen that the time to reach a stable temperature is between 10-12s, the number of puffs is 12-14, and the highest temperature of the susceptor is in the range of 325.1-339.8℃.

[0129] In order to facilitate comparison, the same electromagnetic induction heating appliance is used to test and compare the same self-starting / self-stopping, anti-fake verification, induction heating, temperature measurement and control, and puff number recording functions of a certain commercial aerosol product containing a multi-layer structure susceptor (composite material) and another commercial aerosol product containing a susceptor of a constant expansion porcelain sealing alloy (single material) in a sheet-shaped aerosol generating substrate.

[0130] The multi-layer structure composite susceptor has an elongated strip shape with a length of 12mm, a width of 4mm, and a height of 0.065mm, and its cross section is a sandwich-like composite structure composed of three thin layers of 430 stainless steel with a thickness of 0.045mm, nickel-iron soft magnetic alloy with a thickness of 0.017mm, and 430 stainless steel with a thickness of 0.003mm. The test data of the aerosol product containing the multi-layer composite structure susceptor are shown in Table 4:

[0131] Table 4

[0132]

[0133]

[0134] The shape of the fixed-expansion porcelain-sealing-alloy thin sheet susceptor is an elongated strip thin sheet with L14mm*W2.4mm*H0.10mm, and the aerosol product containing the fixed-expansion porcelain-sealing-alloy thin sheet susceptor has the test data in the electromagnetic induction heating appliance as shown in Table 5:

[0135] Table 5

[0136]

[0137] From the above Table 4 results, it can be seen that the aerosol product containing the multi-layer composite structure susceptor can also achieve the basic functions of self-starting / self-stopping, anti-fake verification, induction heating, temperature measurement and control, and puff recording in the electromagnetic induction appliance. Compared with the puffing data of the aerosol product containing the susceptor of the application in the electromagnetic induction heating appliance in Table 3, it can be found that the results are quite comparable except that the working temperature and the human body inlet temperature are slightly lower.

[0138] The data in Table 5 shows that the aerosol product containing the fixed-expansion porcelain-sealing-alloy thin sheet (single material) susceptor has unstable self-starting / self-stopping function in the electromagnetic induction heating appliance, some aerosol products cannot be recognized by first insertion and need to be inserted twice or more times for recognition, some aerosol products appear to be extinguished during puffing, the temperature of the susceptor is generally low, the smoke components cannot be fully released, the smoke amount is small and the consistency is unstable, and other defects.

[0139] Through inserting the single-alloy susceptor of the application, the component of the compared commercial multi-layer composite susceptor, and the component of the compared commercial ordinary soft magnetic alloy single-layer susceptor into the aerosol generating substrate respectively, and conducting heating experiments and puffing analysis through the electromagnetic induction heating appliance, the experimental data show that the single-alloy single-layer susceptor of the application achieves the use effect of the multi-layer composite susceptor component in function, and can realize self-starting / self-stopping, anti-fake verification, induction heating, temperature measurement and control, and puff recording. However, the ordinary soft magnetic alloy has obvious defects in self-starting, anti-fake verification, working temperature, and smoking continuous puffs. Therefore, the single-alloy susceptor of the application can realize the same functions as the multi-layer composite susceptor component, but the manufacturing process of the single-alloy susceptor of the application is simpler than that of the multi-layer composite susceptor component, and can reduce the cost and energy waste.

[0140] In some embodiments, a single alloy susceptor is provided, which is based on a Fe-Ni-Zr alloy and is added with a first additive element. The susceptor is made into a thin sheet and is inserted into an aerosol product. The aerosol product is subjected to a smoking test by using a common electromagnetic induction heating device.

[0141] The susceptor of the present embodiment contains iron, nickel, zirconium, chromium, and cobalt, and the weight percentage of each element is 12.00% for iron, 72.10% for nickel, 0.40% for zirconium, 0.50% for chromium, and 15.00% for cobalt.

[0142] The susceptor of the present embodiment is based on a Fe-Ni-Zr alloy and is added with a first additive element, including chromium and cobalt. The addition of chromium and cobalt to the Fe-Ni-Zr alloy can improve the functional sensitivity of the susceptor, such as temperature sensitivity. Chromium and cobalt are added to the Fe-Ni-Zr alloy as main additive elements in a proper ratio. On the one hand, the addition of chromium and cobalt can reduce the magnetic permeability of the alloy. On the other hand, the addition of chromium and cobalt can adjust the heating temperature to meet the heating requirements of different types of aerosol generating substrates. In the present application, the temperature is properly customized according to the chromium and cobalt content / weight percentage, so that the temperature sensitivity meets the expectations.

[0143] The Curie temperature of the alloy formed by the above-mentioned formula is about 450°C, which is suitable for the application scenarios of aerosol generating substrates with dense structure, high working temperature requirement, and large aerosol smoke volume. The high-temperature heating mode is a fast heating mode. The basic characteristics of the alloy are as follows. Compared with the alloy composed of the three main elements in the above-mentioned embodiments, the addition of chromium and cobalt can increase the Curie temperature, thereby increasing the working temperature. The reduction of iron content and the increase of cobalt as a replacement material can reduce the initial magnetic permeability, thereby reducing the required magnetic permeability suppression component zirconium. The present embodiment is suitable for aerosol products that require high-temperature release of smoke components.

[0144] The thin sheet-shaped susceptor with the size of L12mm*W4.2mm*H0.12mm is prepared according to the above-mentioned preparation method 1-8 steps, and the thin sheet-shaped susceptor is inserted into the aerosol product of the powder-shaped aerosol generating substrate. The aerosol product is placed in a common electromagnetic induction heating device to perform self-starting / self-stopping, anti-fake verification, induction heating, temperature measurement and control, and record the number of puffs. The results are shown in Table 6.

[0145] Table 6

[0146]

[0147]

[0148] The test results in Table 6 show that the susceptor in the embodiment can realize self-starting / self-stopping, anti-fake verification, induction heating, temperature measurement and control, and puff number recording when inserted into an aerosol product and tested in an electromagnetic induction heating device.

[0149] In some embodiments, the present application provides a single-alloy susceptor embodiment formed from a Fe-Ni-Zr-based alloy as a base material and adding first additive elements and part of second additive elements, and the susceptor is made into a thin sheet and added to an aerosol product, and a common electromagnetic induction heating device on the market is used for smoking experiment.

[0150] The weight percentage of each metal element in the susceptor of the embodiment is 9.10% of iron, 81.60% of nickel, 2.50% of zirconium, 2.40% of chromium, 3.50% of cobalt, 0.25% of silicon, 0.35% of manganese, and 0.30% of carbon.

[0151] The Curie temperature of the alloy formed by the formula is about 410°C, which is suitable for application scenarios with lower heating temperature requirements and smaller aerosol smoke volume, and is a low-temperature implementation mode of slow heating. The basic characteristics of the alloy are: the addition of silicon elements makes the microstructure of the material more uniform and the grain is smaller; the addition of manganese elements improves the hot working performance (such as beneficial to forging and hot rolling); the addition of carbon elements further suppresses the amplitude of the change in magnetic permeability with temperature; the alloy has a high resistivity and a slightly poor eddy current effect; the Curie temperature is low.

[0152] The thin sheet-shaped susceptor with a length of 12 mm, a width of 4.2 mm, and a height of 0.12 mm is made according to the preparation method 1-8 steps of the susceptor, and the thin sheet-shaped susceptor is inserted into an aerosol product of a granular herbal aerosol generating substrate containing nicotine, and the aerosol product is placed in a common electromagnetic induction heating device on the market to test self-starting / self-stopping, anti-fake verification, induction heating, temperature measurement and control, and puff number recording, and the results are shown in Table 7.

[0153] Table 7

[0154]

[0155]

[0156] The test results in Table 7 show that the susceptor in the embodiment can realize self-starting / self-stopping, anti-fake verification, induction heating, temperature measurement and control, and puff number recording when inserted into an aerosol product and tested in an electromagnetic induction heating device.

[0157] The susceptor is formed by adding the first and second additive raw material elements to the iron, nickel, and zirconium-based alloy, and in another embodiment, the raw material ratio of each alloy element can be as shown in Table 8.

[0158] Table 8

[0159]

[0160] The thin sheet-shaped susceptor formed by the raw material ratio of the alloy elements in Table 8 is added to the aerosol generating substrate of the aerosol product, and the aerosol product is placed in the electromagnetic induction heating device for smoking, which can also achieve the functions of self-starting / self-stopping, anti-fake verification, induction heating, temperature measurement and control, and recording the number of puffs.

[0161] In some embodiments, the optimal shape of the susceptor is confirmed, and in this embodiment, the susceptor of different shapes and sizes is manufactured using the alloy formula of the first embodiment, in which the weight ratio percentage of iron, nickel, and zirconium metal elements is 16.00% for iron, 79.00% for nickel, and 5.00% for zirconium. Then, the susceptor of different shapes and sizes is inserted into different aerosol products close to the axial center of the aerosol product, and a common electromagnetic induction heating device on the market is used for heating and smoking comparison experiments.

[0162] Specific embodiment comparison experiment 1: the shape and size of the susceptor are an elongated strip-shaped thin sheet with L12mm*W4.2mm*H0.12mm, the aerosol generating substrate used is a disordered arrangement of powdered tea and herbal substances, and the generated aerosol product is a No. 1 aerosol product. The susceptor is inserted into the aerosol generating substrate of the No. 1 aerosol product, and a common electromagnetic induction heating device on the market is used for heating and smoking experiments.

[0163] The smoking results are as follows:

[0164] 1. The electromagnetic induction heating device can identify the aerosol product, and automatically start the heating operation.

[0165] 2. The preheating time to reach the aerosol product smoking temperature is short and fast, and the time is between 10-12 seconds.

[0166] 3. The temperature is stable during smoking, the taste temperature is stable, the smoke amount is large, and the aerosol throat impact is strong.

[0167] 4. The electromagnetic induction heating device automatically stops heating after 12-14 puffs.

[0168] 5. The highest working temperature of the calibrated metal susceptor and the average temperature of the aerosol entering the human body are between about 325-340℃ and 39-42℃, respectively.

[0169] After the aerosol product was separated, it was found that the susceptor was in close contact with the aerosol generating substrate and no separation phenomenon occurred, so it was concluded that there was no too large temperature instantaneous fluctuation during the smoking process, which would not cause no smoke sometimes. After the test, the first aerosol product was cut open, and the fresh aerosol generating substrate state in (a) was compared Figure 14 (b) as shown. Here, full carbonization means that most of the aerosol generating substrate is pyrolyzed and appears light black. Figure 14

[0170] Specific embodiment comparative experiment two: the shape and size of the susceptor are L6.4mm*W6.4mm*H0.12mm large square thin sheet, the aerosol generating substrate used is thin sheet tobacco in ordered arrangement, the generated aerosol product is set as the second aerosol product, the susceptor is inserted into the aerosol generating substrate of the second aerosol product, and then a common electromagnetic induction heating appliance on the market is used for heating and smoking experiment.

[0171] The smoking result is:

[0172] 1. The electromagnetic induction heating appliance can identify the aerosol product, and automatically start the heating operation.

[0173] 2. The preheating speed to reach the aerosol product smoking temperature is fast, and the time is between 11-13 seconds.

[0174] 3. The temperature is stable during the smoking process, the taste temperature is stable, the smoke amount is moderate, and the aerosol throat impact is strong.

[0175] 4. The electromagnetic induction heating appliance automatically stops heating after 12-14 puffs.

[0176] 5. The highest working temperature of the calibrated metal susceptor and the average temperature of the aerosol entering the human body are about 323-331℃ and 32-35℃, respectively.

[0177] During the experiment, due to the dual action of heat conduction and heat convection, the upper half of the aerosol generating substrate is also effectively heated. After smoking, the second aerosol product was cut open, and the fresh aerosol generating substrate state in (a) was compared Figure 15 (b) as shown. Figure 15

[0178] ​​Specific embodiment comparative experiment three: The shape and size of the receptors are large square thin sheets with a size of L6.4mm*W6.4mm*H0.12mm, and small square thin sheets with a size of L4.0mm*W4.0mm*H0.12mm. The aerosol generating matrix used is disordered tea leaf powder. The generated aerosol product is set as the third aerosol product. Two square thin sheet receptors, one large and one small, are inserted into the aerosol generating matrix of the third aerosol product. The two square receptors have almost no overlap in side projection. Then, a heating and puffing experiment is conducted using a common electromagnetic induction heating device on the market.

[0179] The aspiration results were:

[0180] 1. The electromagnetic induction heating device can identify the aerosol product and automatically start the heating operation.

[0181] 2. The speed of preheating to the aerosol product's puffing temperature was moderate, ranging from 14 to 17 seconds, which was approximately 4 to 5 seconds slower than the preheating time in Experiment 1.

[0182] 3. The temperature is stable during the smoking process, the mouthfeel temperature is high, the amount of smoke is very large, and the aerosol has a strong throat hit.

[0183] 4. After the number of puffs reaches 12-14, the electromagnetic induction heating device will automatically stop heating.

[0184] 5. For the calibration of the maximum operating temperature of the large sensor, please refer to the results of Experiment 2.

[0185] 6. The maximum operating temperature of the calibrated small-chip sensor is approximately between 320-327°C.

[0186] 7. The average aerosol temperature at the human body entrance is calibrated to be between 40-44°C.

[0187] After cutting open the #3 aerosol product and smoking, it was found that the aerosol generating matrix was excessively carbonized in some areas, such as Figure 16 As shown in (b), over-carbonization refers to the excessive pyrolysis of the aerosol-generating matrix due to excessive temperature, resulting in a dark, charred state.

[0188] Comparative Experiment 4: The susceptor was constructed in the form of an oversized square sheet measuring L8.0mm x W8.0mm x H0.12mm. This square was then folded in half along its central axis to form a V-shape with an angle of approximately 45°. The aerosol-generating substrate used consisted of neatly arranged thin sheets of tobacco leaves. The aerosol product to be generated was designated aerosol product number 4. Using a positioning fixture, the triangle formed by the V-shaped susceptor was inserted into the aerosol-generating substrate of the fourth aerosol product, with the center of the triangle near the axial center of the aerosol product. A heating and puffing experiment was then conducted using a common commercially available electromagnetic induction heating device.

[0189] The results of the suction are:

[0190] 1. The electromagnetic induction heating device can identify the aerosol product and automatically start the heating operation.

[0191] 2. The preheating speed to the aerosol product suction temperature is very fast, and the time is between 8-10 seconds.

[0192] 3. The temperature is stable during the suction process, the taste temperature is very high, the smoke amount is very large, and the aerosol throat feeling is strong.

[0193] 4. The electromagnetic induction heating device automatically stops heating after 12-14 puffs.

[0194] 5. The highest working temperature of the calibrated metal susceptor and the average temperature of the aerosol entering the human body are about 328-338℃ and 42-47℃, respectively.

[0195] After the suction, the #4 aerosol product was cut open, and it was found that the aerosol generating substrate in many areas was overcarbonized, as shown in (b) in Figure 17

[0196] The suction experiment data of experiments one to four are summarized as follows in Table 9:

[0197] Table 9

[0198]

[0199] It was found that the configuration of large and small square and V-shaped susceptors all appeared high temperature, and the aerosol generating substrate appeared local or most overcarbonization phenomenon. In experiment two, the single square susceptor, the heating temperature appeared slightly low phenomenon, and in experiment one, the suction temperature of the elongated strip-shaped susceptor was moderate, the preheating time and the suction experience effect were the best effect.

[0200] In addition to the aerosol generating substrate and the susceptor described above, the aerosol product can also include different auxiliary elements such as filters, polylactic acid cooling sections, etc. The susceptor is arranged to contact and heat along the longitudinal direction of the aerosol generating substrate. For example, the cylindrical aerosol product is wrapped with an outer shell or packaging material to fix the substrate and shape, as shown in the figures and texts of experiments one to four, the susceptor is configured to diffuse heat from the center to the outside.

[0201] ​An aerosol-generating system comprises an aerosol-generating device and an aerosol-generating article which is heated within the aerosol-generating device to generate an aerosol. The aerosol-generating device can be an electromagnetic induction heating appliance comprising an electrically operated device which interacts with susceptors provided in an aerosol-generating substrate of the aerosol-generating article to generate an aerosol by heating the aerosol-generating substrate. Preferably, the electromagnetic induction heating appliance is a smoking device for generating an aerosol which is directly inhaled by a user through the user's mouth. In particular, the electromagnetic induction heating appliance is a hand-held aerosol-generating device. The device comprises a receiving chamber for at least partially receiving the aerosol-generating article therein, the receiving chamber being embedded in a housing of the aerosol-generating device. Further, an induction source is comprised which is configured to generate a high-frequency alternating electromagnetic field for coupling with the susceptors. (The aerosol-generating device comprises electromagnetic induction heating appliances, and common resistance heating appliances, the name should be emphasized electromagnetic induction heating appliances, the name should be unified, either with receiving chamber or with receiving room)

[0202] The susceptors of the present invention are preferably configured to be driven by a high-frequency alternating electromagnetic field, in particular a high-frequency electromagnetic field. The range of the high-frequency electromagnetic field can be between 30 kHz (kiloHertz) and 20 MHz (megaHertz), in particular between 1 MHz (megaHertz) and 9 MHz (megaHertz), preferably between 3 MHz (megaHertz) and 7 MHz (megaHertz). In order to generate the alternating electromagnetic field, the induction source comprises at least one induction coil. A single induction coil or a plurality of induction coils can be comprised, the number of induction coils depending on the number and / or the size and shape of the susceptors. Likewise, the induction coil or the plurality of induction coils is adapted to the shape of the housing of the aerosol-generating device.

[0203] The susceptors of the present invention are of a single-layer structure, which is easy to insert or integrate into the aerosol-generating article, and is simpler in manufacturing process and lower in cost compared to the multi-layer composite structure composed of two or more alloys on the market. Due to the single Curie temperature point of the susceptors, under the excitation of the magnetic field generated by the electromagnetic induction heating appliance and the closed-loop feedback, the self-starting / self-stopping, anti-counterfeiting identification, inductive heating, temperature measurement and control, and puff counting of the aerosol-generating article can be easily realized.

[0204] Compared with the susceptors on the market using soft magnetic alloy sheets, the susceptors of the present invention have a low initial magnetic permeability, which presents a peak characteristic with the increase of temperature. When working with the electromagnetic induction heating appliance, the susceptors are more stable in the functions of self-starting / self-stopping, anti-counterfeiting identification, inductive heating, temperature measurement and control, and puff counting, and do not have the defects of being unable to be identified, small and inconsistent smoke volume, and extinguishing during the smoking process.

[0205] The disclosed embodiments of the present application are merely exemplary and should not be treated as a limitation to the scope of the present application. Of course, the modifications, equivalent substitutions, variations, and the like, made by those skilled in the art in accordance with the claims of the present application, are still within the scope of the present application and should be included in the protection scope of the claims of the present application.

Claims

1. A sensor for inductively heating an aerosol-generating substrate, characterized in that: The sensor is a single alloy sensor of an iron-nickel-zirconium based alloy with iron, nickel and zirconium as main raw materials. The main raw materials include iron, nickel and zirconium, and their weight percentages are respectively 2.00-35.00% iron, 60.00-90.00% nickel and 0.40-10.00% zirconium.

2. The sensor according to claim 1, wherein It also includes a first additive element raw material of chromium and / or cobalt, which is mixed and smelted with the main element raw material to adjust the working temperature reference point of the susceptor to adapt to the heating requirements of different types of aerosol generating substrates.

3. The sensor according to claim 2, wherein: The first additive element raw materials respectively account for 0.50-20.00% by weight of chromium and 0.50-20.00% by weight of cobalt.

4. The sensor according to claim 2, wherein: The invention also includes a second additive element raw material, which is mixed and smelted with the main element raw material to improve the processing performance or physical properties of the susceptor.

5. The susceptor according to claim 4, characterized in that The second additional element raw material includes one or more of aluminum, boron, molybdenum, manganese, copper, titanium, neodymium, magnesium, silicon, carbon, niobium, phosphorus, vanadium, gadolinium, lanthanum, and cerium, and their weight proportions are respectively 0-8.00% of aluminum, 0-7.60% of boron, 0-7.20% of molybdenum, 0-6.00% of manganese, 0-4.20% of copper, 0-3.50% of titanium, 0-2.80% of neodymium, 0-2.20% of magnesium, 0-2.00% of silicon, 0-1.80% of carbon, 0-1.50% of niobium, 0-1.00% of phosphorus, 0-0.90% of vanadium, 0-0.80% of gadolinium, 0-0.60% of lanthanum, and 0-0.50% of cerium.

6. The susceptor according to claim 1, wherein The initial magnetic permeability of the susceptor presents a peak characteristic as the temperature rises in the range from room temperature 20°C to the Curie temperature point. The initial magnetic permeability of the susceptor is not higher than 20,000 Gauss / Oersted at room temperature 20°C.

7. The susceptor according to claim 6, characterized in that The peak characteristic has a single-peak characteristic curve, and the stable operating temperature of the susceptor is on the right side of the peak and close to the peak.

8. The susceptor according to claim 6, characterized in that The peak characteristic has a double-peak characteristic curve of a first peak and a second peak. The stable operating temperature of the susceptor is on the right side of the first peak and close to the first peak, or on the right side of the second peak and close to the second peak.

9. The susceptor according to claim 6, characterized in that The resistivity of the susceptor is 2-30×10 -8 Between Ω·m.

10. The susceptor according to claim 6, characterized in that The Curie temperature of the susceptor is between 300-600°C.

11. The susceptor according to claim 6, wherein The susceptor is configured in a geometric shape to be combined with the aerosol-generating substrate for generating eddy currents to induce heating.

12. The susceptor according to claim 11, characterized in that The geometric shape includes any one of a sheet shape or a deformation thereof, a sphere shape or a deformation thereof, a column shape or a deformation thereof, a spring shape, a paper clip shape or a deformation thereof, a mesh plate shape or a perforated plate shape.

13. The susceptor according to claim 12, characterized in that The sensor is in the shape of an elongated thin sheet with a thickness of 0.04-0.25 mm.

14. The susceptor according to claim 12, wherein: The sensor is in the shape of a slender column with a diameter of 0.5-3.5 mm.

15. A method for preparing any of the aforementioned susceptors, characterized in that: The method comprises the following steps: S1: taking elemental raw materials according to weight ratio percentage, placing them into a furnace for melting, and then vacuum smelting them within a temperature range of 1300-2000°C; S2: subjecting the mixture after vacuum smelting to secondary electroslag remelting and vacuum self-consumption, cooling and solidifying to form an alloy ingot; S3: tempering the alloy ingot above the crystallization temperature, then removing impurities and pore layers on the outer surface, high-temperature forging and hot pressing to form an alloy body plate; S4: cold rolling the alloy body plate to press it into a preset thickness.

16. An aerosol product, characterized in that: The invention comprises an aerosol-generating substrate and a susceptor according to any one of claims 1 to 14, wherein the susceptor is arranged in the aerosol-generating substrate.

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