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: 40-55% of Ni, 0.1-1.0% of Cu, 0-15% of Co, and less than or equal to 0.1% of C, Si, Mn, Cr, Mo, Al, P and S in total content. 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 0.25 * 10 <-6 > omega.m, and the saturation induction density is gt; and 1.4 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 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 susceptor material, wherein the chemical composition of the susceptor material includes: Ni, Cu, and Fe; wherein, in terms of mass fraction,

[0006] The content of Ni is 40% to 55%, and the content of Cu is 0.1% to 1.0%.

[0007] Optionally, the Cu content is 0.2% to 0.65%.

[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, and 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 ≤0.085%.

[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 0.25×10 -6 Ω·m, and the saturation magnetic induction intensity is >1.4T.

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

[0015] Successively smelt and cast the raw materials to obtain an alloy ingot;

[0016] Successively forge, hot-roll, cold-work, perform a first heat treatment, segmented cold-work heat treatment, and a second heat treatment on the alloy ingot to obtain an alloy product;

[0017] Shape the alloy product to obtain the receptor material.

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

[0019] The heating temperature of the 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 40% to 55%, as the Ni content increases, the Curie temperature gradually increases, and the saturation magnetic induction intensity first increases and then decreases; 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 40% to 55%, 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 accompanying drawings herein are incorporated into the specification and constitute 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 accompanying 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 flowchart 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 suction testing 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 suction testing 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 suction testing 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 accompanying 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 of 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 the individual 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 the individual numbers within the range, such as 1, 2, 3, 4, 5, and 6, which applies regardless of the range. Additionally, 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 orientation terms such as "upper" and "lower" specifically refer to the drawing direction in the drawings. Additionally, in the description of the present application specification, the terms "comprising", "including", etc. mean "including but not limited to". In this text, 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 text, "and / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural.

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

[0034] In a first aspect, embodiments of the present application provide a receptor material, and the chemical composition of the receptor material includes: Ni, Cu, and Fe; wherein, in terms of mass fraction,

[0035] the content of Ni is 40% to 55%, and the content of Cu is 0.1% to 1.0%.

[0036] In some embodiments, the content of Cu is 0.2% to 0.65%.

[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 40% to 55%, as the Ni content increases, the Curie temperature gradually increases, and the saturation magnetic induction intensity first increases and then decreases; 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 40% to 55%, 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 sensor material, thereby improving the electrical performance of the sensor material.

[0039] The Ni content can be 40% to 55% to ensure that the sensor material has a Curie temperature of 400 to 550 °C. The Cu content can be 0.1% to 1.0%. 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. These two are contradictory points. In the embodiments of the present application, 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. 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 pumping experience will be poor; if the Cu content is lower than 0.1%, it is difficult to play the role of reducing the resistivity. Exemplarily, the Ni content can be 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 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 includes 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, the Curie temperature, resistivity and saturation magnetic induction intensity can be precisely controlled. When the Ni content is in the range of 40 to 55%, as the Ni content increases, the Curie temperature gradually increases, and the saturation magnetic induction intensity first increases and then decreases; as the Co content increases, the Curie temperature and the saturation magnetic induction intensity gradually increase; with the addition of the Cu element, the resistivity can be reduced, but the saturation magnetic induction intensity will also be reduced at the same time, and the two are a contradiction. In order to reduce the resistivity and increase the saturation magnetic induction intensity, it is necessary to achieve a perfect balance between the resistivity and the saturation magnetic induction intensity through precise control of the element content. Therefore, the embodiment of the present application not only improves the saturation magnetic induction intensity, but also reduces the resistivity, significantly improves the eddy current loss power, shortens the induction preheating time, and increases the heating efficiency.

[0044] In some embodiments, 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%.

[0045] In some embodiments, the content of the impurity element is ≤0.085%.

[0046] Impurity elements C, Si, Mn, Cr, Mo, Al, P and S play a negative role in reducing magnetic induction intensity and increasing resistivity, thereby reducing the heating efficiency of the sensor material; the content of impurity elements can be ≤0.1% to ensure that the sensor material has a higher magnetic induction intensity and a lower resistivity, thereby ensuring that the sensor material has a higher heating efficiency. If the content of the impurity element 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 element can be 0.1%, 0.09%, 0.08%, 0.085%, 0.075%, 0.07%, etc.

[0047] Therefore, in the embodiments of the present application, by precisely controlling the element content, a perfect balance between the resistivity and the saturation magnetic induction intensity is achieved. This not only improves the saturation magnetic induction intensity but also reduces the resistivity, significantly enhancing the eddy current loss power, shortening the induction preheating time (≤9 seconds), and increasing the heating efficiency.

[0048] In some embodiments, 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.

[0049] The morphology of the receptor material can be designed according to requirements, and the morphology of the receptor material can be one of 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 0.25×10 -6 Ω·m, and the saturation magnetic induction intensity is >1.4T.

[0051] The receptor material provided by the embodiments of the present application is a single material with simple composition and structure, which can simultaneously realize the functions of heating and temperature control and can replace the multi-layer receptor material; 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 0.25×10 -6 Ω·m, the saturation magnetic induction intensity is higher than 1.4T, the induction preheating time is shorter, and the heating 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 It is a schematic flow chart of a preparation method for a receptor material provided by 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 temperatures and in a vacuum, it is added later 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. When the pressure in the furnace drops to 0.1 to 0.4 Pa, heat the material using the induction coil. After all the material has melted, power off for 5 minutes after refining for 20 minutes. Then add the Cu in the hopper to the crucible, and fill the vacuum induction furnace with argon until the pressure in the furnace reaches 0.05 MPa to 0.06 MPa. After that, continue to heat the material using the induction coil for 3 to 5 minutes, then adjust the temperature and refine for 1 to 3 minutes and then stop heating. Finally, pour the melt in the crucible into a mold, cool it and then demold it to obtain an alloy ingot. Among them, the raw materials include Fe, Ni, Co and Cu.

[0055] S2. Perform forging, hot rolling, cold working, first heat treatment, segmented cold working-heat treatment and second heat treatment on the alloy ingot in sequence to obtain an alloy product;

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

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

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

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

[0060] Perform forging on the alloy ingot with the surface oxide scale removed. The heating temperature for forging is 1180 °C to 1250 °C, and forge it into a flat billet of the required size. Perform hot rolling on the flat billet with the surface oxide scale cleaned. The heating temperature for hot rolling is 1150 °C to 1230 °C, and hot roll it into a cold strip billet of the required size. Perform cold working (the cold working can be cold drawing or cold rolling) to open the billet on the cold strip billet with the surface oxide scale cleaned, and the opening deformation is 50% to 70%;

[0061] Then perform the first heat treatment and segmented cold working-heat treatment on the cold strip billet after opening the billet:

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

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

[0064] For the pipe, the first heat treatment atmosphere is hydrogen with a purity of not less than 99.999%, the first heat treatment temperature is 1000°C to 1100°C, the holding time is 1 min to 10 min, and then segmented cold drawing-heat treatment (950°C to 1050°C) is carried out until the final cold drawing to 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 finished foil strip, finished wire and finished pipe after the above-mentioned tension levelling are subjected to a second heat treatment. The heat treatment atmosphere 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. Shape the alloy product to obtain the sensor material.

[0067] The above alloy products (foil strip or wire or pipe) are shaped into slender shapes (slender sheet shape or slender wire shape or slender pipe shape), "B" shape, "C" shape, "D" shape, "E" shape, "H" shape, "K" shape, "U" shape, "W" shape, "M" shape, "V" shape, "S" shape and other morphological sensor materials or woven into a net-shaped sensor material.

[0068] Therefore, the sensor material provided by the embodiment of the present application can be prepared by cold rolling a foil strip with a thickness of 0.02 mm to 1.0 mm, cold drawing a wire with a diameter of 0.1 mm to 4 mm, and 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. The preparation process is simple and mature, and batch stable production can be realized. The preparation methods and morphologies of the sensor material are rich and diverse, and can meet various aerosol generating systems with a wide variety and diverse changes.

[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°C 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°C to 550°C, which 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) In the preparation process of the existing receptor materials, there are harmful substances such as organic molding aids, and the environmental friendliness is poor. However, there are no harmful substances in the preparation process of the receptor materials in the embodiments of the present application, and the environmental friendliness is better.

[0076] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application. The experimental methods without specific conditions noted in the following embodiments are usually determined according to national standards. If there is no corresponding national standard, they are carried out according to general international standards, conventional conditions or the conditions recommended by the manufacturer.

[0077] Example 1

[0078] A receptor material, in terms of mass fraction, the chemical composition is: Ni: 41.5%, Co: 5.2%, Cu: 0.22%, the total content of impurity elements such as C, Si, Mn, Cr, Mo, Al, P and S is 0.085%, and Fe is the balance.

[0079] A preparation method of a receptor material, including:

[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 0.15 Pa, heat the materials with 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, fill the vacuum induction furnace with argon until the pressure in the furnace is 0.052 MPa, and then continue to heat the materials with the induction coil for 4 min. After that, adjust the temperature and refine for 2 min and then stop heating. Finally, pour the melt in the crucible into a mold, cool and demold to obtain an alloy ingot.

[0081] (2) Forging. Forge the alloy ingot with the surface oxide scale removed, and the forging heating temperature is 1230 °C, and forge it into a flat blank of the required size.

[0082] (3) Hot rolling. Carry out hot rolling on the flat blank with the surface oxide scale cleaned, and the hot rolling heating temperature is 1180 °C, and hot roll it into a cold strip blank of 5.5×260 mm.

[0083] (4) Cold rolling and heat treatment. Carry out cold rolling blanking on the cold strip blank with the surface oxide scale cleaned, and the blanking deformation amount is 60%; then carry out heat treatment on the cold strip blank after blanking. The heat treatment atmosphere is hydrogen with a purity not less than 99.999%, the heat treatment temperature is 1080 °C, and the holding time is 2.5 min. Then carry out segmented rolling - heat treatment until finally roll it into a finished foil with a thickness of 0.08 mm, and the finished rolling deformation amount is 85%.

[0084] (5) Stretch rectification. The finished foil strip with a thickness of 0.08 mm is subjected to stretch rectification, and the stretch rectification tension is 22 kN.

[0085] (6) Finished product heat treatment. The finished foil strip after stretch rectification is subjected to heat treatment. The heat treatment atmosphere is hydrogen with a purity of not less than 99.999%, the heat treatment temperature is 800 °C, and the holding time is 0.6 min.

[0086] (7) Preparation of the sensor material. The foil strip is made into slender sheet-shaped, "B"-shaped, "K"-shaped, "E"-shaped, "H"-shaped, "S"-shaped, "M"-shaped and other forms of sensor materials.

[0087] After testing, the Curie temperature of the sensor material obtained in Example 1 is 455 °C, the resistivity is 0.031×10 -6 Ω·m, and the saturation magnetic induction intensity is 1.61 T.

[0088] The sensor material of Example 1 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. The use effect of the same smoking devices and cartridge products of Philip Morris International is used as a comparative example. It is found that the sensor material made in Example 1 is stable and rapid in the induction preheating stage. The induction preheating 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 puffing data results of the sensor material of Example 1 shown in Table 1. Figure 2 This is a comparison physical diagram (left - front, right - back) of the sensor material before and after the puffing test provided in Example 1 of this application; please refer to Figure 2 , and the aerosol generation matrix is carbonized uniformly and sufficiently.

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

[0090]

[0091]

[0092] Example 2

[0093] A sensor material, in terms of mass fraction, the chemical composition is: Ni: 48.2%, Cu: 0.57%, the total content of impurity elements C, Si, Mn, Cr, Mo, Al, P and S is 0.06%, and the balance is Fe.

[0094] A preparation method of a sensor 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 0.21 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 0.05 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.

[0096] (2) Forging. Forge the alloy ingot with the surface oxide scale removed. The forging heating temperature is 1200 °C, and forge it into a flat billet or square billet of the required size.

[0097] (3) Hot rolling. Perform hot rolling on the flat billet or square billet with the surface oxide scale cleaned. The hot rolling heating temperature is 1160 °C, and hot roll it into a wire rod with a diameter of Φ8 mm.

[0098] (4) Cold drawing and heat treatment. Perform cold drawing and blanking on the wire rod with the surface oxide scale cleaned. The blanking deformation is 55%; then perform heat treatment on the wire rod after blanking. The heat treatment atmosphere is hydrogen with a purity of not less than 99.999%, the heat treatment temperature is 1020 °C, and the holding time is 3.5 min. Then perform segmented cold drawing - heat treatment until finally cold draw it into a finished wire rod with a diameter of 0.8 mm. The finished cold drawing deformation is 75%.

[0099] (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 950 °C, and the holding time is 2 min.

[0100] (6) Preparation of sensor materials. Make the finished wire rod into slender wire - shaped, "B" - shaped, "C" - shaped, "D" - shaped, "U" - shaped, "W" - shaped, "V" - shaped and other morphological sensor materials or weave them into a net - shaped sensor material.

[0101] After testing, the Curie temperature of the sensor material obtained in Example 2 is 490 °C, the resistivity is 0.023×10 -6 Ω·m, and the saturation magnetic induction intensity is 1.56 T.

[0102] The susceptor material of Example 2 was placed in the mainstream smoking articles and cigarette cartridges launched by Philip Morris International, the world's largest tobacco company in the United States, and the use effects of the same smoking articles and cigarette cartridges of Philip Morris International were used as comparative examples. It was found that the susceptor material prepared by this example was stable and rapid in the induction preheating stage, the induction preheating time was significantly shorter than that of the comparative example, the aerosol was generated uniformly and at a suitable temperature, the number of puffs was 14 to 15, and the taste was better. The specific results are shown in Table 2 as the puffing data results of the susceptor material of Example 2. Figure 3 This is a comparison of the physical pictures of a sensor material before and after the suction test provided in Example 2 of the present application (left side - before, right side - after); please refer to Figure 3 , the aerosol generation matrix is ​​carbonized uniformly and fully.

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

[0104]

[0105] Example 3

[0106] A sensor material has the following chemical compositions by mass fraction: Ni: 52.2%, Co: 2.8%, Cu: 0.63%, the total content of impurity elements C, Si, Mn, Cr, Mo, Al, P and S is 0.07%, and Fe is the balance.

[0107] A method for preparing a susceptor material, comprising:

[0108] (1) Melting. The raw materials except Cu are placed in a crucible, and then the vacuum induction melting furnace is evacuated. When the pressure in the furnace drops to 0.32 Pa, the material is heated by an induction coil. After the material is completely melted, it is refined for 20 minutes and then the power is turned off for 5 minutes. Then, the Cu in the hopper is added to the crucible, and argon is filled into the vacuum induction furnace until the pressure in the furnace reaches 0.06 MPa. Then, the material is heated by the induction coil for 4.5 minutes, and then the temperature is adjusted and refined for 1.5 minutes before stopping the heating. Finally, the molten material in the crucible is cast into a mold, and the mold is demolded after cooling to obtain an alloy ingot.

[0109] (2) Forging: The alloy ingot with the surface oxide scale removed is forged at a forging heating temperature of 1240°C to a slab or billet of the required size.

[0110] (3) Hot rolling: The flat slab or square billet with the surface oxide scale cleaned is hot rolled at a heating temperature of 1200°C and hot rolled to a Φ8mm wire rod.

[0111] (4) Cold drawing and heat treatment. The wire rod with the surface oxide scale removed is cold drawn for blanking, and the blanking deformation is 55%; 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 1030 °C, the holding time is 2.5 min, and then segmented cold drawing - heat treatment is carried out until the final cold drawing to a pipe with an outer diameter of 1.5 mm and a wall thickness of 0.3 mm, and the finished cold drawing deformation is 80%.

[0112] (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 min.

[0113] (6) Preparation of sensor materials. The finished pipes are made into slender tube shapes, "C" shapes, "Z" shapes, "S" shapes, "U" shapes and other forms of sensor materials or woven into mesh - shaped sensor materials.

[0114] After testing, the Curie temperature of the sensor material obtained in Example 3 is 538 °C, the resistivity is 0.019×10 -6 Ω·m, and the saturation magnetic induction intensity is 1.51 T.

[0115] The sensor material of Example 3 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 puffing data results of the sensor material of Example 3 shown in Table 3. Figure 4 It is a comparison physical diagram (left - front, right - back) of the sensor material provided in Example 3 of this application before and after the puffing test; please refer to Figure 4 , and the aerosol - generating matrix is carbonized uniformly and sufficiently.

[0116] Table 3 Puffing data results of the sensor 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: Co: 15%, Cu: 1.0%.

[0121] After testing, the Curie temperature of the sensor material obtained in Example 4 is 539 °C, the resistivity is 0.035×10 -6 Ω·m, and the saturation magnetic induction intensity is 1.98 T.

[0122] When the sensor material provided in Example 4 was tested, the induction preheating time of the sensor materials in various forms was 9 seconds.

[0123] Comparative Example 1

[0124] Based on the disclosure of Example 3, the difference between Comparative Example 1 and Example 3 is that: Ni: 60%.

[0125] After testing, the Curie temperature of the sensor material obtained in Comparative Example 1 is 601 °C, the resistivity is 0.0185×10 -6 Ω·m, and the saturation magnetic induction intensity is 1.47 T.

[0126] When the sensor material provided in Comparative Example 1 was tested, the induction preheating time of the sensor materials in various forms was 9 seconds, but there was an obvious sense of charring during the suction process.

[0127] Comparative Example 2

[0128] Based on the disclosure of Example 3, the difference between Comparative Example 2 and Example 3 is that: Cu: 1.2%.

[0129] After testing, the Curie temperature of the sensor material obtained in Comparative Example 2 is 525 °C, the resistivity is 0.0182×10 -6 Ω·m, and the saturation magnetic induction intensity is 1.14 T.

[0130] When the sensor material provided in Comparative Example 2 was tested, the induction preheating time of the sensor materials in various forms was 21 seconds.

[0131] In summary, from Examples 1 to 4, it can be seen that the performance of the sensor material meets the requirements: the Curie temperature is 400 °C to 550 °C, the resistivity is 0.018×10 -6 Ω·m to 0.25×10 -6 Ω·m, the saturation magnetic induction intensity is >1.4 T, it has a good suction effect, and the induction preheating time does not exceed 9 s. In Comparative Example 1, the Ni content is too high, resulting in a too high Curie temperature of the sensor material, an obvious sense of charring during the suction process, and a poor experience; in Comparative Example 2, the Cu content is too high, resulting in a low saturation magnetic induction intensity of the sensor material and a long induction preheating time. The suction effect of the sensor materials in Comparative Examples 1 to 2 is worse than that in Examples 1 to 4.

[0132] One or more technical solutions in the embodiments of the present application at least further have the following technical effects or advantages:

[0133] (1) The susceptor material provided in the embodiment of the present application is a single material with simple composition and structure, can realize heating and temperature control functions at the same time, can replace multi-layer susceptor materials, and compared with multi-layer susceptor materials, has a simpler preparation process, fewer preparation processes, easier tolerance control, lower production cost, and better economy;

[0134] (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;

[0135] (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;

[0136] (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;

[0137] (5) The preparation process of the sensor material does not involve any harmful substances, which is more environmentally friendly.

[0138] 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 40% to 55%, and the content of Cu is 0.1% to 1.0%.

2. The receptor material according to claim 1, characterized in that The content of Cu is 0.2% to 0.65%.

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, and 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 ≤0.085%.

7. The receptor material according to claim 1, wherein 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 0.25×10 -6 Ω·m, and a saturation magnetic induction intensity of >1.4T.

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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