Receptor material and preparation method thereof

Abstract

The invention relates to a receptor material and a preparation method thereof, and belongs to the technical field of receptor materials. The receptor material comprises the following chemical components in percentage by mass: 77-97% of Ni, 0.1-1.0% of Cu, 0-15% of Co, and the sum of the contents of C, Si, Mn, Cr, Mo, Al, P and S is less than or equal to 0.1%. According to the embodiment of the invention, the Curie temperature, the resistivity and the saturation induction density of the material are accurately regulated and controlled by adjusting and optimizing the content of each element, and the performance requirements are met: the Curie temperature is 400-550 DEG C, the resistivity is 0.018 * 10 <-6 > omega.m to 0.21 * 10 <-6 > omega.m, and the saturation induction density is gt; and 1.0 T.

Description

Technical Field

[0001] The present application relates to the technical field of sensor materials, and in particular to a sensor material and a preparation method thereof. Background Art

[0002] An aerosol generating system for heating an aerosol-forming substrate by the electromagnetic induction principle includes a receptor material component, and the receptor material component includes an induction source and a receptor material. The induction source is configured to generate an alternating electromagnetic field, which induces heat in the receptor material, thereby generating at least one of eddy current loss and hysteresis loss. The aerosol generating substrate can be ordered tobacco shreds, disordered tobacco shreds, or tea leaves, herbal plant particles or powders, all of which are expected to be heated to volatilize aerosols for inhalation. In order to control the temperature of the substrate, a receptor material has been proposed. At present, there are two main types of receptor materials, among which the mainstream is a receptor material having two layers, three layers or even more than a first receptor material and a second receptor material, and the receptor material has two Curie temperature points; the second is a receptor material of a single material, and the receptor material has only one Curie temperature point.

[0003] For single-layer sensor materials, there are the following problems: (1) The resistivity of the sensor material is relatively high. Since the sensor material mainly works on the principle of eddy current loss heating, the eddy current loss power Pe is negatively correlated with the resistivity. Therefore, when the resistivity of the sensor material is relatively high, the eddy current loss power will decrease, resulting in a decrease in heat generation. The induction preheating time is relatively long, which affects the smoking experience. (2) The preparation method is cumbersome. After vacuum smelting, the alloy ingot needs to undergo secondary electroslag remelting and vacuum self-consumption, and the alloy ingot is tempered, resulting in a waste of cost and resources and poor economic efficiency. (3) The Curie temperature of the sensor material is relatively low. For magnetic materials, the magnetic properties will drop sharply when approaching the Curie temperature. The sensor material with a Curie temperature of 200°C to 400°C has poor efficiency in heating the current heat-not-burn aerosol products, and the induction preheating time is long, which affects the smoking experience. Summary of the invention

[0004] The present application provides a sensor material and a preparation method thereof to solve the following technical problem: how to improve the electrical properties of the sensor material.

[0005] In a first aspect, an embodiment of the present application provides a sensor material, wherein the chemical composition of the sensor material includes: Ni, Cu, and Fe; wherein, in terms of mass fraction,

[0006] The content of Ni is 77% to 97%, and the content of Cu is 0.1% to 1.0%.

[0007] Optionally, in the chemical composition, the content of Ni is 84% ​​to 97%, and the content of Cu is 0.15% to 0.35%.

[0008] Optionally, the chemical composition further includes Co.

[0009] Optionally, the content of Co is 0 to 15%.

[0010] Optionally, the chemical composition further includes impurity elements, the impurity elements include C, Si, Mn, Cr, Mo, Al, P, and S, and the content of the impurity elements is ≤0.1%.

[0011] Optionally, the content of the impurity elements is ≤0.08%.

[0012] Optionally, the morphology of the receptor material includes one of the following: elongated, B-shaped, C-shaped, D-shaped, E-shaped, H-shaped, K-shaped, U-shaped, W-shaped, M-shaped, V-shaped, S-shaped.

[0013] Optionally, the receptor material satisfies at least one of the following properties: the Curie temperature is 400°C to 550°C, the resistivity is 0.018×10 -6 Ω·m to 0.21×10 -6 Ω·m, and the saturation magnetic induction intensity is >1.0T.

[0014] In a second aspect, an embodiment of the present application provides a method for preparing the receptor material according to any one of the first aspect, the method includes:

[0015] Melting and casting the raw materials in sequence to obtain an alloy ingot;

[0016] Forging, hot rolling, cold working, first heat treatment, segmented cold working-heat treatment, and second heat treatment are performed on the alloy ingot in sequence to obtain an alloy product;

[0017] Shaping the alloy product to obtain a receptor material.

[0018] Optionally, the heating temperature for forging is 1180°C to 1250°C; and / or,

[0019] The heating temperature for hot rolling is 1150°C to 1230°C; and / or,

[0020] The temperature of the first heat treatment is 1000°C to 1090°C; and / or,

[0021] The temperature of the second heat treatment is 650°C to 1080°C.

[0022] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0023] The receptor material provided by the embodiment of the present application has a chemical composition including Ni and Cu. Considering the effects of the contents of Ni and Cu on the Curie temperature, saturation magnetic induction intensity, and resistivity of the receptor material, when the Ni content is in the range of 77% to 97%, with the increase of the Ni content, both the Curie temperature and the saturation magnetic induction intensity gradually decrease; with the addition of the Cu element, the effect of reducing the resistivity can be achieved, but at the same time, the saturation magnetic induction intensity will also be reduced. Due to the contradiction between the two, the content of Cu is designed to be 0.1% to 1.0%. Therefore, the Ni content is 77% to 97%, and the Cu content is 0.1% to 1.0%, achieving a precise regulation balance of the Curie temperature, resistivity, and saturation magnetic induction intensity of the receptor material, thereby improving the electrical properties of the receptor material. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic flow chart of a preparation method of a receptor material provided by an embodiment of the present application;

[0027] Figure 2 It is a comparison physical diagram of an aerosol generation matrix before and after the suction test of a receptor material provided in Embodiment 1 of the present application;

[0028] Figure 3 It is a comparison physical diagram of an aerosol generation matrix before and after the suction test of a receptor material provided in Embodiment 2 of the present application;

[0029] Figure 4 It is a comparison physical diagram of an aerosol generation matrix before and after the suction test of a receptor material provided in Embodiment 3 of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present application belong to the scope of protection of the present application.

[0031] The various embodiments of the present application may exist in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be construed as a rigid limitation on the scope of the present application; therefore, it should be considered that the description of the said range has specifically disclosed all possible sub-ranges and single values within the range. For example, it should be considered that the description of the range from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. In addition, whenever a numerical range is indicated herein, it means including any cited number (fraction or integer) within the indicated range.

[0032] In the present application, unless otherwise stated, the directional terms such as "upper" and "lower" specifically refer to the drawing directions in the drawings. In addition, in the description of the specification of the present application, the terms "comprising", "including", etc. mean "including but not limited to". In this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this article, "and / or" describes the associated relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. Where A and B may be singular or plural.

[0033] Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment, etc. used in the present application can be obtained through market purchases or can be prepared by existing methods.

[0034] In a first aspect, an embodiment of the present application provides a receptor material, and the chemical composition of the receptor material includes: Ni, Cu, and Fe; wherein, by mass fraction,

[0035] the content of Ni is 77% to 97%, and the content of Cu is 0.1% to 1.0%.

[0036] In some embodiments, in the chemical composition, the content of Ni is 84% to 97%, and the content of Cu is 0.15% to 0.35%.

[0037] When the receptor material generates heat, it mainly uses eddy current loss to generate heat, and the eddy current loss power P e is related to the shape of the receptor material. When the receptor material is in the shape of a sheet, the eddy current loss formula is: where f represents the operating frequency, B mrepresents the saturation magnetic induction intensity, ρ represents the resistivity, and d represents the sheet thickness. When the sensor material is in a cylindrical or tubular form, the eddy current loss formula is: where f represents the operating frequency, B m represents the magnetic induction intensity, ρ represents the resistivity, and r represents the radius. Regardless of the form of the sensor material, the common feature of its eddy current loss power is that it is proportional to the frequency, saturation magnetic induction intensity, and the square of the sensor material size, and inversely proportional to the resistivity.

[0038] The chemical composition of the sensor material includes Ni and Cu. Considering the effects of the contents of Ni and Cu on the Curie temperature, saturation magnetic induction intensity, and resistivity of the sensor material, when the Ni content is in the range of 77% to 97%, as the Ni content increases, both the Curie temperature and the saturation magnetic induction intensity gradually decrease; with the addition of the Cu element, the effect of reducing the resistivity can be achieved, but at the same time, the saturation magnetic induction intensity will also be reduced. Due to the contradiction between the two, the content of Cu is designed to be 0.1% to 1.0%. Therefore, the Ni content is 77% to 97%, and the Cu content is 0.1% to 1.0%, achieving an accurate regulation and balance of the Curie temperature, resistivity, and saturation magnetic induction intensity of the sensor material, thereby improving the electrical properties of the sensor material.

[0039] The content of Ni can be 77% to 97% to ensure that the receptor material has a Curie temperature of 400°C to 550°C, which can better adapt to the heating and baking temperature of the mainstream aerosol generation matrix currently on the market, with high heating efficiency, short induction preheating time, and better suction experience; if the content of Ni is higher than 97%, the Curie temperature will be lower than 400°C, the heating efficiency will be low, the induction preheating time will be long, and the suction experience will be poor; if the content of Ni is lower than 77%, the Curie temperature will be higher than 550°C, the aerosol generation matrix will be severely carbonized, and a burnt smell will appear, affecting the suction experience, and even burning will occur, damaging the appliance. The content of Cu can be 0.1% to 1.0%. With the addition of Cu elements, the effect of reducing resistivity can be achieved, but at the same time, the saturation magnetic induction intensity will also be reduced, and the two are contradictory points. In the embodiment of the present application, both the resistivity must be reduced and the saturation magnetic induction intensity must be increased, so it is necessary to achieve a perfect balance between the resistivity and the saturation magnetic induction intensity through precise control of the element content. If the Cu content is higher than 1.0%, the magnetic induction intensity will be significantly reduced, the heating efficiency will be low, the induction preheating time will be long, and the suction experience will be poor; if the Cu content is lower than 0.1%, it will be difficult to reduce the resistivity. Exemplarily, the Ni content can be 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, etc.; the Cu content can be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, etc.

[0040] In some embodiments, the chemical composition further comprises Co.

[0041] In some embodiments, the Co content is 0 to 15%.

[0042] The content of Co can be 0 to 15%. As the content of Co increases, the Curie temperature and saturation magnetic induction intensity gradually increase. According to the actual content of the Co element, the Curie temperature and magnetic induction intensity are regulated to maintain the Curie temperature in the range of 400°C to 550°C, which can better adapt to the heating and baking temperature of the mainstream aerosol generation matrix currently on the market, with high heating efficiency, short induction preheating time, and better suction experience. If the content of Co is higher than 15%, the Curie temperature will be higher than 550°C, the aerosol generation matrix will be severely carbonized, and a burnt smell will appear, affecting the suction experience, and even burning and damaging the appliance. Exemplarily, the content of Co can be 0.1%, 0.2%, 0.3%, 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, etc.

[0043] By adjusting and optimizing the content of each element, precise control of its Curie temperature, resistivity, and saturation magnetic induction intensity can be achieved. When the Ni content is in the range of 77% to 97%, as the Ni content increases, both the Curie temperature and the saturation magnetic induction intensity gradually decrease; as the Co content increases, the Curie temperature and the saturation magnetic induction intensity gradually increase; with the addition of the Cu element, the effect of reducing the resistivity can be achieved, but at the same time, the saturation magnetic induction intensity will also be reduced, and the two are a contradiction point. To both reduce the resistivity and increase the saturation magnetic induction intensity, precise control of the element content is required to achieve a perfect balance between the resistivity and the saturation magnetic induction intensity. Therefore, the embodiment of the present application not only increases the saturation magnetic induction intensity but also reduces the resistivity, significantly improving the eddy current loss power, making the induction preheating time shorter and the heating efficiency higher.

[0044] In some embodiments, the chemical composition further includes impurity elements, and the impurity elements include C, Si, Mn, Cr, Mo, Al, P, and S, and the content of the impurity elements is ≤0.1%.

[0045] In some embodiments, the content of the impurity elements is ≤0.08%.

[0046] The impurity elements C, Si, Mn, Cr, Mo, Al, P, and S play a negative role in reducing the magnetic induction intensity and increasing the resistivity, thereby reducing the heating efficiency of the sensor material; the content of the impurity elements can be ≤0.1% to ensure that the sensor material has a high magnetic induction intensity and a low resistivity, thereby ensuring that the sensor material has a high heating efficiency. If the content of the impurity elements is higher than 0.1%, it may reduce the magnetic induction intensity, increase the resistivity, and significantly reduce the heating efficiency of the sensor material. Exemplarily, the content of the impurity elements can be 0.1%, 0.09%, 0.08%, 0.085%, 0.075%, 0.07%, etc.

[0047] Therefore, in the embodiment of the present application, precise control of the element content achieves a perfect balance between the resistivity and the saturation magnetic induction intensity, not only increasing the saturation magnetic induction intensity but also reducing the resistivity, significantly improving the eddy current loss power, making the induction preheating time shorter (≤14 seconds) and the heating efficiency higher.

[0048] In some embodiments, the morphology of the sensor material includes one of the following: elongated, B-shaped, C-shaped, D-shaped, E-shaped, H-shaped, K-shaped, U-shaped, W-shaped, M-shaped, V-shaped, S-shaped.

[0049] The morphology of the sensor material can be designed according to requirements, and the morphology of the sensor material can be one of the elongated, B-shaped, C-shaped, D-shaped, E-shaped, H-shaped, K-shaped, U-shaped, W-shaped, M-shaped, V-shaped, S-shaped.

[0050] In some embodiments, the receptor material satisfies at least one of the following properties: the Curie temperature is 400°C to 550°C, the resistivity is 0.018×10 -6 Ω·m to 0.21×10 -6 Ω·m, and the saturation magnetic induction intensity is >1.0T.

[0051] The receptor material provided in the embodiments of the present application is a single material, with simple composition and structure, and can simultaneously realize the functions of heating and temperature control, and can replace multi-layer receptor materials; the Curie temperature of the receptor material is 400°C to 550°C, which can better adapt to the heating and baking temperature of the mainstream aerosol generation matrix on the market at present, with faster and more stable heating and better heating effect; the receptor material has a low resistivity, which is 0.018×10 -6 Ω·m to 0.21×10 -6 Ω·m, the saturation magnetic induction intensity is higher than 1.0T, the induction preheating time is shorter, and the heat generation efficiency is higher.

[0052] In a second aspect, the embodiments of the present application provide a preparation method for the receptor material according to any one of the first aspects, Figure 1 which is a schematic flow chart of a preparation method for a receptor material provided in the embodiments of the present application; please refer to Figure 1 and the method includes:

[0053] S1. Smelt and cast the raw materials in sequence to obtain an alloy ingot;

[0054] Place the raw materials except Cu in a crucible (since Cu is volatile at high temperature and in vacuum, adding it later is to ensure the recovery rate of Cu element, otherwise the volatilization is serious and the recovery rate is very low.), then evacuate the vacuum induction melting furnace, wait until the pressure in the furnace drops to 0.1 to 0.4 Pa, heat the material with an induction coil, wait until all the material melts, refine for 20 min and then cut off the power for 5 min, then add Cu in the hopper to the crucible, fill the vacuum induction furnace with argon until the pressure in the furnace is 0.05 MPa to 0.06 MPa, then continue to heat the material with the induction coil for 3 min to 5 min, then adjust the temperature and refine for 1 min to 3 min and then stop heating, and finally pour the melt in the crucible into a mold, cool and demold to obtain an alloy ingot. Among them, the raw materials include Fe, Ni, Co, and Cu.

[0055] S2. Forge, hot roll, cold draw, perform a first heat treatment, and a second heat treatment on the alloy ingot in sequence to obtain an alloy product;

[0056] In some embodiments, the heating temperature of the forging is 1180°C to 1250°C; and / or,

[0057] The heating temperature of the hot rolling is 1150°C to 1230°C; and / or,

[0058] The temperature of the first heat treatment is 1000°C to 1090°C; and / or,

[0059] The temperature of the second heat treatment is 650°C to 1080°C.

[0060] Forging process is carried out on the alloy ingot with the surface scale removed. The heating temperature for forging is 1180°C to 1250°C, and it is forged into a flat billet of the required size. The flat billet with the surface scale cleaned is subjected to hot rolling. The heating temperature for hot rolling is 1150°C to 1230°C, and it is hot rolled into a cold strip billet of the required size. The cold strip billet with the surface scale cleaned is subjected to cold working (the cold working can be cold drawing or cold rolling) to break the billet, and the deformation amount for breaking the billet is 50% to 70%;

[0061] Then, the first heat treatment and segmented cold working-heat treatment are carried out on the cold strip billet after breaking the billet:

[0062] For foil strip materials, the atmosphere of the first heat treatment is hydrogen with a purity of not less than 99.999%. The first heat treatment temperature is 1000°C to 1090°C, and the holding time is 0.5 min to 3 min. Then, segmented rolling-heat treatment (950°C to 1050°C) is carried out until the final rolling into a finished foil strip material with a thickness of 0.02 mm to 1.0 mm. The deformation amount for the final rolling is 70% to 90%. In addition, the 0.02 mm to 1.0 mm finished foil strip material can also be subjected to tension leveling, and the tension for tension leveling is 20 kN to 60 kN.

[0063] For wire materials, the atmosphere of the first heat treatment is hydrogen with a purity of not less than 99.999%. The heat treatment temperature is 1000°C to 1100°C, and the holding time is 1 min to 10 min. Then, segmented cold drawing-heat treatment (950°C to 1050°C) is carried out until the final cold drawing into a finished wire material with a diameter of 0.1 mm to 4.0 mm. The deformation amount for the final cold drawing is 70% to 90%.

[0064] For pipe materials, the atmosphere of the first heat treatment is hydrogen with a purity of not less than 99.999%. The first heat treatment temperature is 1000°C to 1100°C, and the holding time is 1 min to 10 min. Then, segmented cold drawing-heat treatment (950°C to 1050°C) is carried out until the final cold drawing into a pipe with an outer diameter of 0.1 mm to 4 mm and a wall thickness of 0.01 mm to 1.0 mm.

[0065] Second heat treatment: The above-mentioned finished foil strip materials, finished wire materials and finished pipe materials after tension leveling are subjected to the second heat treatment. The atmosphere of the heat treatment is hydrogen with a purity of not less than 99.999%. The heat treatment temperature is 650°C to 1080°C, and the holding time is 1 to 15 min.

[0066] S3, shaping the alloy product to obtain a sensor material.

[0067] The above alloy products (foil strips or wires or tubes) are shaped into slender (slender thin sheets or slender wires or slender tubes), "B"-shaped, "C"-shaped, "D"-shaped, "E"-shaped, "H"-shaped, "K"-shaped, "U"-shaped, "W"-shaped, "M"-shaped, "V"-shaped, "S"-shaped and other shaped receptor materials or woven into mesh receptor materials.

[0068] Therefore, the sensor material provided in the embodiment of the present application can be prepared by cold-rolling a foil strip with a diameter of 0.02mm to 1.0mm, cold-drawing a wire with a diameter of 0.1mm to 4mm, and a tube with an outer diameter of 0.1mm to 4mm and a wall thickness of 0.01mm to 1.0mm. The preparation process is simple and mature, and stable batch production can be achieved. The preparation methods and forms of the sensor materials are rich and varied, which can meet the needs of a wide variety of aerosol generating systems.

[0069] The preparation method of the sensor material is implemented based on the above-mentioned sensor material. The specific chemical composition of the sensor material can refer to the above-mentioned embodiment. Since the preparation method of the sensor material adopts part or all of the technical solutions of the above-mentioned embodiment, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiment, which will not be described one by one here.

[0070] In summary, the susceptor material and preparation method thereof provided in the embodiments of the present application have the following advantages:

[0071] (1) The existing receptor materials have complex components and structures. In particular, due to the large difference in thermal expansion coefficients, multi-layer receptor materials are prone to stratification and bending during heating, resulting in uneven aerosol heating, or the second receptor material cannot be temperature-controlled, and the system cannot recognize or even stop heating, affecting the puffing experience. In the embodiment of the present application, the receptor material has a simple composition and structure, and the receptor material is a single-layer material. During heating, stratification and bending are avoided, and heating and temperature control functions can be achieved simultaneously, replacing multi-layer receptor materials.

[0072] (2) The Curie temperature of existing receptor materials is relatively low, and their compatibility with the heating and baking temperature of the mainstream aerosol generation matrix is ​​poor. For magnetic materials, the magnetic properties will drop sharply when approaching the Curie temperature. Receptor materials with a Curie temperature of 200 to 400°C are inefficient when heating current heat-not-burn aerosol products, and the induction preheating time is long, which affects the smoking experience. The receptor material of the embodiment of the present application adjusts and optimizes the content of each element to have a Curie temperature of 400 to 550°C. This can better adapt to the heating and baking temperature of the mainstream aerosol generation matrix currently on the market, has high heating efficiency, short induction preheating time, and better smoking experience;

[0073] (3) The resistivity of existing sensor materials is relatively high, the induction preheating time is long, and the heating efficiency is low. When the sensor material heats up, it mainly uses eddy current loss to generate heat, and the eddy current loss power is inversely proportional to the resistivity and directly proportional to the square of the magnetic induction intensity, that is, the smaller the magnetic induction intensity, the higher the resistivity, the lower the eddy current loss power, and the worse the heating effect. However, the embodiment of the present application improves the magnetic induction intensity, reduces the resistivity, significantly improves the heating efficiency, shortens the induction preheating time, and provides a better smoking experience by adjusting and optimizing the content of each element;

[0074] (4) The preparation process of existing sensor materials is complex, difficult to control, and has poor economic efficiency. The sensor materials of the embodiments of the present application are prepared by traditional cold rolling or cold drawing, which has a simple and mature process and can achieve stable batch production. In addition, the sensor materials have rich and diverse forms and can meet the needs of various types of aerosol generation systems with various variations.

[0075] (5) The existing susceptor material preparation process contains harmful substances such as organic molding additives, which is environmentally friendly. However, the susceptor material preparation process of the embodiment of the present application does not contain any harmful substances, which is more environmentally friendly.

[0076] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended only to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for the unrecorded specific conditions in the following examples are usually measured according to national standards. If there is no corresponding national standard, then carry out according to general international standards, normal conditions or according to the conditions recommended by the manufacturer.

[0077] Example 1

[0078] A sensor material has the following chemical compositions, measured by mass fraction: Ni: 80.2%, Cu: 0.34%, the sum of the impurity elements C, Si, Mn, Cr, Mo, Al, P and S being 0.08%, and Fe being the remainder.

[0079] A method for preparing a susceptor material, comprising:

[0080] (1) Melting. Place the raw materials except Cu in a crucible, then evacuate the vacuum induction melting furnace. When the pressure in the furnace drops to 0.23 Pa, heat the materials using the induction coil. After all the materials are melted, refine for 20 min and then cut off the power for 5 min. Then add Cu in the hopper to the crucible, fill the vacuum induction furnace with argon until the pressure in the furnace is 0.054 MPa. After that, continue to heat the materials using the induction coil for 3.5 min. Then adjust the temperature and refine for 2.5 min, and finally stop heating. Pour the melt in the crucible into a mold, demold after cooling to obtain an alloy ingot.

[0081] (2) Forging. Forge the alloy ingot after removing the surface oxide scale. The forging heating temperature is 1225 °C, and forge it into a flat blank of the required size.

[0082] (3) Hot rolling. Hot roll the flat blank with the surface oxide scale cleaned. The hot rolling heating temperature is 1185 °C, and hot roll it into a cold strip blank of 6.0×300 mm.

[0083] (4) Cold rolling and heat treatment. Cold roll the cold strip blank with the surface oxide scale cleaned to perform blanking. The blanking deformation is 65%; then perform heat treatment on the cold strip blank after blanking. The heat treatment atmosphere is hydrogen with a purity of not less than 99.999%, the heat treatment temperature is 1030 °C, and the holding time is 2 min. Then perform segmented rolling - heat treatment until finally roll it into a finished foil with a thickness of 0.12 mm. The finished rolling deformation is 80%.

[0084] (5) Stretch leveling. Perform stretch leveling on the finished foil strip with a thickness of 0.12 mm. The stretch leveling tension is 24 kN.

[0085] (6) Finished product heat treatment. Perform heat treatment on the finished foil strip after stretch leveling. The heat treatment atmosphere is hydrogen with a purity of not less than 99.999%, the heat treatment temperature is 850 °C, and the holding time is 1 min.

[0086] (7) Preparation of sensor material. Make the foil strip into sensor materials in the forms of slender thin sheets, "C" shape, "D" shape, "W" shape, "U" shape, "V" shape, etc.

[0087] After testing, the Curie temperature of the sensor material obtained in Example 1 is 546 °C, the resistivity is 0.0186×10 -6 Ω·m, and the saturation magnetic induction intensity is 1.06 T.

[0088] The receptor material of Example 1 was placed in the mainstream smoking devices and cartridges launched by Philip Morris International, the world's largest tobacco company in the United States, for testing. The usage effect of the same smoking devices and cartridges of Philip Morris International was used as the comparative example. It was found that the receptor material made from Example 1 was stable and rapid in the induction preheating stage, the induction preheating time was significantly shorter than that of the comparative example, the aerosol generation was uniform and the temperature was appropriate, the number of puffs was between 14 and 15, and the taste was better. The specific results were the puffing data results of the receptor material of Example 1 shown in Table 1. Figure 2 This is a comparison physical diagram (left - front, right - back) of a receptor material before and after puffing test provided in Example 1 of this application; please refer to Figure 2 , and the aerosol - generating matrix was carbonized uniformly and sufficiently.

[0089] Table 1 Puffing data results of the receptor material of Example 1

[0090]

[0091]

[0092] Example 2

[0093] A receptor material, by mass fraction, the chemical components are: Ni: 89.1%, Co: 2.3%, Cu: 0.15%, the total content of impurity elements such as C, Si, Mn, Cr, Mo, Al, P, and S is 0.06%, and the balance is Fe.

[0094] A preparation method of a receptor material, including:

[0095] (1) Melting. Place the raw materials except Cu in a crucible, then evacuate the vacuum induction melting furnace. When the pressure in the furnace drops to 0.3 Pa, heat the materials using the induction coil. After all the materials are melted, refine for 20 min and then cut off the power for 5 min. Then add Cu in the hopper to the crucible, fill the vacuum induction furnace with argon until the pressure in the furnace is 0.06 MPa, and then continue to heat the materials using the induction coil for 4 min. After that, adjust the temperature and refine for 1.5 min and then stop heating. Finally, pour the melt in the crucible into a mold, cool and then demold to obtain an alloy ingot.

[0096] (2) Forging. Forge the alloy ingot with the surface oxide scale removed. The forging heating temperature is 1210 °C, and forge it into a flat blank or square blank of the required size.

[0097] (3) Hot rolling. Perform hot rolling on the flat blank or square blank with the surface oxide scale cleaned. The hot rolling heating temperature is 1170 °C, and hot roll it into a wire rod with a diameter of Φ8 mm.

[0098] (4) Cold drawing and heat treatment. The wire rod with the surface oxide scale cleaned is cold drawn for blanking, and the blanking deformation is 65%; then the wire after blanking is heat treated. The heat treatment atmosphere is hydrogen with a purity of not less than 99.999%, the heat treatment temperature is 1035 °C, the holding time is 4 min, and then segmented cold drawing - heat treatment is carried out until the final finished wire with a diameter of 2.0 mm is cold drawn, and the finished cold drawing deformation is 72%.

[0099] (5) Finished product heat treatment. The finished wire is heat treated. The heat treatment atmosphere is hydrogen with a purity of not less than 99.999%, the heat treatment temperature is 900 °C, and the holding time is 3.5 min.

[0100] (6) Preparation of sensor material. The finished wire is made into slender wire - shaped, "B" - shaped, "K" - shaped, "M" - shaped, "T" - shaped, "Z" - shaped and other morphological sensor materials or woven into a net - shaped sensor material.

[0101] After testing, the Curie temperature of the sensor material obtained in Example 2 is 527 °C, the resistivity is 0.0191×10 -6 Ω·m, and the saturation magnetic induction intensity is 1.11 T.

[0102] The sensor material of Example 2 is placed in the mainstream smoking devices and cartridges launched by Philip Morris International, the world's largest tobacco company in the United States, for testing, and the use effect of the same - type smoking devices and cartridges of Philip Morris International is used as a comparative example. It is found that the sensor material made in this example is stable and rapid in the induction pre - heating stage, the induction pre - heating time is significantly shorter than that of the comparative example, the aerosol generation is uniform and the temperature is appropriate, the number of puffs is between 14 and 15, and the taste is better. The specific results are the suction data results of the sensor material of Example 2 shown in Table 2. Figure 3 This is a comparison physical diagram (left - front, right - back) of the sensor material provided in Example 2 of the present application before and after the suction test; please refer to Figure 3 , and the aerosol - generating matrix is carbonized uniformly and sufficiently.

[0103] Table 2 Suction data results of the sensor material of Example 2

[0104]

[0105] Example 3

[0106] A sensor material, by mass fraction, the chemical composition is: Ni: 95.6%, Co: 3.7%, Cu: 0.28%, the total content of impurity elements such as C, Si, Mn, Cr, Mo, Al, P and S is 0.07%, and Fe is the balance.

[0107] A preparation method of a receptor material, comprising:

[0108] (1) Melting. Place the raw materials except Cu in a crucible, then evacuate the vacuum induction melting furnace. When the pressure in the furnace drops to 0.18 Pa, heat the materials using an induction coil. After all the materials are melted, refine for 20 min and then cut off the power for 5 min. Then add Cu in the hopper to the crucible, and fill the vacuum induction furnace with argon until the pressure in the furnace reaches 0.055 MPa. After that, continue to heat the materials using the induction coil for 3.5 min. Then adjust the temperature and refine for 2.3 min, and then stop heating. Finally, pour the melt in the crucible into a mold, cool and demold to obtain an alloy ingot.

[0109] (2) Forging. Forge the alloy ingot with the surface scale removed. The forging heating temperature is 1225 °C, and forge it into a flat blank or square blank of the required size.

[0110] (3) Hot rolling. Perform hot rolling on the flat blank or square blank with the surface scale cleaned. The hot rolling heating temperature is 1175 °C, and hot roll it into a wire rod with a diameter of Φ8 mm.

[0111] (4) Cold drawing and heat treatment. Perform cold drawing to open the billet on the wire rod with the surface scale cleaned. The opening reduction is 62%; then perform heat treatment on the wire rod after opening. The heat treatment atmosphere is hydrogen with a purity of not less than 99.999%, the heat treatment temperature is 1010 °C, and the holding time is 4 min. Then perform segmented cold drawing - heat treatment until finally cold draw it into a tube with an outer diameter of 2.2 mm and a wall thickness of 0.5 mm. The finished cold drawing reduction is 78%.

[0112] (5) Finished product heat treatment. Perform heat treatment on the finished wire rod. The heat treatment atmosphere is hydrogen with a purity of not less than 99.999%, the heat treatment temperature is 1010 °C, and the holding time is 2.5 min.

[0113] (6) Preparation of receptor material. Make the finished tube into a slender tube shape, "C" shape, "Z" shape, "S" shape, "U" shape and other morphological receptor materials or weave them into a mesh receptor material.

[0114] After testing, the Curie temperature of the receptor material obtained in Example 3 is 483 °C, the resistivity is 0.020×10 -6 Ω·m, and the saturation magnetic induction intensity is 1.08 T.

[0115] The receptor material of Example 3 was placed in the mainstream smoking devices and cartridges launched by Philip Morris International, the world's largest tobacco company in the United States, for testing, and the usage effect of the same smoking devices and cartridge products of Philip Morris International was used as the comparative example. It was found that the receptor material prepared in this example was stable and rapid during the induction preheating stage, the induction preheating time was significantly shorter than that of the comparative example, the aerosol generation was uniform and the temperature was appropriate, the number of puffs was 14 to 15, and the taste was better. The specific results are shown in the puffing data results of the receptor material of Example 3 in Table 3. Figure 4 This is a comparison physical diagram (left - front, right - back) of a receptor material before and after puffing test provided in Example 3 of this application; please refer to Figure 4 , and the aerosol - generating matrix was uniformly and sufficiently carbonized.

[0116] Table 3 Puffing data results of the receptor material of Example 3

[0117]

[0118]

[0119] Example 4

[0120] Based on the disclosure of Example 3, the difference between Example 4 and Example 3 is: Ni: 77%, Cu: 1.0%.

[0121] After testing, the Curie temperature of the receptor material obtained in Example 4 was 545 °C, the resistivity was 0.019×10 -6 Ω·m, and the saturation magnetic induction intensity was 1.05 T.

[0122] The receptor material provided in Example 4 was tested, and the induction preheating time of the receptor materials in various forms was 14 seconds.

[0123] Example 5

[0124] Based on the disclosure of Example 3, the difference between Example 5 and Example 3 is: Co: 15%.

[0125] After testing, the Curie temperature of the receptor material obtained in Example 5 was 541 °C, the resistivity was 0.055×10 -6 Ω·m, and the saturation magnetic induction intensity was 1.79 T.

[0126] The receptor material provided in Example 5 was tested, and the induction preheating time of the receptor materials in various forms was 14 seconds.

[0127] Comparative Example 1

[0128] Based on the disclosure of Example 3, the difference between Comparative Example 1 and Example 3 is: Ni: 70%.

[0129] After testing, the Curie temperature of the sensor material obtained in Comparative Example 2 is 608 °C, the resistivity is 0.024×10 -6 Ω·m, and the saturation magnetic induction intensity is 1.32 T.

[0130] The sensor material provided by Comparative Example 1 was tested, and the induction preheating time of the sensor materials in various forms was 10 seconds, but there was an obvious burnt smell during the pumping process.

[0131] Comparative Example 2

[0132] Based on the disclosure of Example 3, the difference between Comparative Example 2 and Example 3 is: Cu: 1.2%.

[0133] After testing, the Curie temperature of the sensor material obtained in Comparative Example 3 is 464 °C, the resistivity is 0.0194×10 -6 Ω·m, and the saturation magnetic induction intensity is 0.87 T.

[0134] The sensor material provided by Comparative Example 2 was tested, and the induction preheating time of the sensor materials in various forms was 24 seconds.

[0135] In summary, from Examples 1 to 5, it can be seen that the performance of the sensor material meets the requirements: the resistivity is 0.018×10 -6 Ω·m to 0.21×10 -6 Ω·m, the saturation magnetic induction intensity is >1.0 T, it has a good pumping effect, and the induction preheating time does not exceed 14 s. In Comparative Example 1, the Ni content is low, resulting in a high Curie temperature of the sensor material, an obvious burnt smell during the pumping process, and a poor experience; in Comparative Example 2, the Cu content is high, resulting in a low saturation magnetic induction intensity of the sensor material and a long induction preheating time. The pumping effect of the sensor materials in Comparative Examples 1 to 2 is worse than that in Examples 1 to 5.

[0136] One or more technical solutions in the embodiments of the present application at least further have the following technical effects or advantages:

[0137] (1) The sensor material provided by the embodiments of the present application is a single material, with simple composition and structure. It can simultaneously achieve the functions of heating and temperature control, can replace multi-layer sensor materials, and compared with multi-layer sensor materials, the preparation process is simple, the preparation process is less, the tolerance control is easier, the production cost is lower, and the economy is better;

[0138] (2) The susceptor material provided in the embodiment of the present application has a Curie temperature of 400°C to 550°C, which can better adapt to the heating and baking temperature of the mainstream aerosol generating matrix currently on the market, and the heating is faster and more stable, and the heating effect is better;

[0139] (3) The susceptor material provided in the embodiment of the present application has good surface quality, high saturation magnetic induction intensity, low resistivity, shorter induction preheating time, higher heating efficiency, and better puffing experience;

[0140] (4) The preparation process of the sensor material provided in the embodiment of the present application is simple and mature, and can achieve stable batch production. The preparation methods and forms of the sensor material are rich and diverse, and can meet the needs of various types of aerosol generation systems with various variations;

[0141] (5) No harmful substances are involved in the production process, which is more environmentally friendly.

[0142] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A receptor material, the chemical composition of the receptor material comprising: Ni, Cu, and Fe; wherein, by mass fraction, the content of Ni is 77% to 97%, and the content of Cu is 0.1% to 1.0%.

2. The receptor material according to claim 1, wherein In the chemical composition, the content of Ni is 84% to 97%, and the content of Cu is 0.15% to 0.35%.

3. The receptor material according to claim 1, characterized in that, The chemical composition further includes Co.

4. The receptor material according to claim 3, characterized in that, The content of Co is 0 to 15%.

5. The receptor material according to claim 1, characterized in that, The chemical composition further includes impurity elements, the impurity elements include C, Si, Mn, Cr, Mo, Al, P, and S, and the content of the impurity elements is ≤0.1%.

6. The receptor material according to claim 5, wherein The content of the impurity elements is ≤0.08%.

7. The receptor material according to claim 1, characterized in that The morphology of the receptor material includes one of the following: elongated shape, B shape, C shape, D shape, E shape, H shape, K shape, U shape, W shape, M shape, V shape, S shape.

8. The receptor material according to any one of claims 1 to 7, characterized in that The receptor material satisfies at least one of the following properties: a Curie temperature of 400°C to 550°C, a resistivity of 0.018×10 -6 Ω·m to 0.21×10 -6 Ω·m, and a saturation magnetic induction intensity of >1.0 T.

9. A method for preparing the receptor material according to any one of claims 1 to 8, the method comprising: successively melting and casting the raw materials to obtain an alloy ingot; successively forging, hot rolling, cold working, first heat treatment, segmented cold working - heat treatment, and second heat treatment on the alloy ingot to obtain an alloy product; shaping the alloy product to obtain the receptor material.

10. The method according to claim 9, wherein The heating temperature of the forging is 1180°C to 1250°C; and / or, The heating temperature of the hot rolling is 1150°C to 1230°C; and / or, The temperature of the first heat treatment is 1000°C to 1090°C; and / or, The temperature of the second heat treatment is 650°C to 1080°C.

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