Soft-state magnetic heating receptor, plate and electromagnetic smoke cartridge comprising soft-state magnetic heating receptor

Abstract

The utility model discloses a soft-state magnetic heating receptor, a plate and an electromagnetic smoke cartridge comprising the same, the soft-state magnetic heating receptor comprises a first magnetic metal layer and a second magnetic metal layer, and a diffusion layer intermetallic compound generated by atomic diffusion reaction exists between the first magnetic metal layer and the second magnetic metal layer. The average Vickers hardness HV0.2 of the surface of the soft-state magnetic heating receptor is less than 200. According to the embodiment of the invention, the atomic diffusion physical and chemical reaction is carried out at the contact interface to generate the diffusion layer intermetallic compound with higher strength and very thin thickness, so that the first magnetic metal layer and the second magnetic metal layer have stronger bonding force, and the bonding strength between the adjacent layers is enhanced. The high surface average Vickers hardness of a traditional stainless steel substrate is changed as a support, the diffusion layer is used as a gripper to achieve tight combination of all the layers, the purpose that the surface is in a soft state but the overall strength is large is achieved, high-speed cutting in the machining and manufacturing process is facilitated, and abrasion to a cutter and deformation of the cut-off position after cutting are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to novel tobacco heating technical field, especially relate to a soft state magnetic heating susceptor, panel and the electromagnetic cigarette bullet containing it. BACKGROUND

[0002] The electromagnetic induction heating non-combustible cigarette bullet is known in the novel tobacco technology, and the magnetic heating element (magnetic heating susceptor) configuration in the commercially available electromagnetic cigarette bullet product and the news report mainly adopts stainless steel as the base material and is constructed into a sheet shape, which is embedded in the aerosol matrix. However, the magnetic property of stainless steel is weak, which leads to slow eddy current heating speed, so that the smoking set needs a long preheating time (for example, dozens of seconds) to reach the expected working temperature. Moreover, the strength and hardness of stainless steel itself are high, and the magnetic heating element material based on stainless steel is in a hard state or a semi-hard state. On the one hand, such high strength / hardness is conducive to handling, clamping and other operations in the processing process, but on the other hand, it is not conducive to segmentation and cutting, and it will cause large deformation at the cutting edge during segmentation and cutting, which affects the insertion or embedding into the aerosol matrix, causing difficulties in batch production and unstable quality.

[0003] Therefore, based on this background, a solution is needed to improve the cutting problem of the magnetic heating susceptor. SUMMARY

[0004] To solve the above technical bottleneck, a soft state magnetic heating susceptor is proposed, which includes a first magnetic metal layer and a second magnetic metal layer, and a diffusion layer intermetallic compound generated by atomic diffusion reaction between the first magnetic metal layer and the second magnetic metal layer. The average Vickers hardness HV0.2 of the surface of the soft state magnetic heating susceptor is less than 200.

[0005] Further, the average thickness of the diffusion layer is less than 0.002mm.

[0006] Further, the diffusion layer is formed by softening annealing after the first magnetic metal layer and the second magnetic metal layer are compounded by calendering.

[0007] Further, the first magnetic metal layer and the second magnetic metal layer form interatomic metallurgical bonding at the diffusion layer.

[0008] Further, the first magnetic metal layer material includes iron-nickel alloy, the second magnetic metal layer material includes iron-silicon alloy, and the main chemical components of the diffusion layer are nickel-silicon compound, iron-silicon compound, or a combination of the two.

[0009] Further, it further includes a third metal layer and two diffusion layers, and the diffusion layers are generated by the reaction of the third metal layer with the first magnetic metal layer and the second magnetic metal layer, respectively.

[0010] Further, the magnetic permeability of the first magnetic metal is higher than that of the second magnetic metal at the same temperature in the temperature range of 20-400 DEG C.

[0011] Further, the first magnetic metal layer and the second magnetic metal layer are further provided with a protective layer towards the outer side.

[0012] Further, the first magnetic metal layer and the second magnetic metal layer are further provided with a protective layer towards the outer side.

[0013] Further, the first magnetic metal layer and the second magnetic metal layer are further provided with a protective layer towards the outer side.

[0014] The beneficial effects of the present application are: the atomic diffusion physical and chemical reaction occurs at the contact interface to produce a diffusion layer intermetallic compound with high intensity but very thin thickness, so that the first magnetic metal layer and the second magnetic metal layer have strong bonding force, thereby enhancing the bonding strength between adjacent layers. By changing the high surface average Vickers hardness of the traditional stainless steel substrate as the support, the diffusion layer is used as the key to realize the tight combination of each layer, and the purpose of showing soft state but large overall strength is achieved, which is beneficial to high-speed cutting in processing and manufacturing, reduces the wear of the cutting tool and the deformation of the cut-off part. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings required in the embodiments will be briefly introduced below. Obviously, the drawings described below are only part of the embodiments of the present application, and for those skilled in the art, other drawings obtained without creative labor should be included in the technical scheme of the present application.

[0016] Figure 1 It is a longitudinal sectional view of the electromagnetic cartridge structure;

[0017] Figure 2 It is a longitudinal sectional view of the electromagnetic cartridge structure;

[0018] Figure 3 It is a structure schematic view of the soft magnetic heating susceptor of embodiment one;

[0019] Figure 4 It is an annealing experimental data graph of the soft magnetic heating susceptor;

[0020] Figure 5 It is a structure sectional schematic view of the soft magnetic heating susceptor of embodiment three. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0022] Referring to Figure 1 and Figure 2 , an electromagnetic cartridge containing a magnetic heating susceptor is shown, especially an electromagnetic cartridge containing a soft magnetic heating susceptor.

[0023] The electromagnetic cartridge adopts a three-section structure, including a heating section, a cooling part and a filter tip coaxially connected in sequence. In some embodiments, a four-section structure can also be adopted. The three-section and four-section cartridge structures are existing, and the related existing background technologies are directly introduced in the present application. In the three-section electromagnetic cartridge structure, the heating section includes a magnetic heating susceptor 1, an aerosol substrate 2 and a shaping layer 3. The shaping layer 3 is formed into an elongated cylindrical shape by using a high-temperature-resistant material, and internally contains the aerosol substrate 2. The magnetic heating susceptor 1 is inserted into the aerosol substrate 2 and is located in the central region parallel to the axis of the extension direction. The cooling part 4 adopts a cylindrical shape with a cooling channel inside. The filter tip 5 adopts a dense sponge cylindrical shape. After the heating section, the cooling part and the filter tip are coaxially assembled, cigarette paper and an external smoke tube 6 are used to wrap and bond from the outside in parallel, forming an elongated cylindrical cartridge.

[0024] In the specific implementation, the average wall thickness of the external smoke tube 6 is 0.3 mm, the diameter of the cartridge is 7 mm, and the total length is 44 mm. The length of the heating section is 15 mm, the length of the cooling section is 17 mm, and the length of the filter section is 12 mm. The magnetic heating susceptor 1 is in the form of an elongated sheet, and the size (length * width * thickness) of a single sheet is 15*3.7*0.066 mm, which is inserted into the central axis region of the aerosol substrate.

[0025] Embodiment one

[0026] As described above, referring to Figure 3 , a soft magnetic heating susceptor 1 with a binary composite structure is shown. It includes a first magnetic metal layer 101 and a second magnetic metal layer 102. The physical shape after compounding is in the form of a thin strip, and the typical size is 3.83*0.08 mm.

[0027] The first magnetic metal layer 101 has an average thickness of 0.015 mm and is made of iron-nickel based constant expansion alloy 4J52, which has a Curie temperature between 400-550°C, typically 500°C. The second magnetic metal layer 102 has an average thickness of 0.065 mm and is made of iron-silicon alloy, which has a Si content of 0.5 wt%, and has a Curie temperature between 650-1200°C, typically 700°C. The first magnetic metal layer 101 mainly functions as a temperature marker layer, and the second magnetic metal layer 102 mainly functions as an eddy current heating layer. The first magnetic metal layer 101 and the second magnetic metal layer 102 are tightly attached to each other, and form an interatomic metallurgical bond at the interface, and a diffusion layer intermetallic compound 103 is present at the interface. The diffusion layer has an average thickness of less than 0.002 mm, and typically has an average thickness of about 0.0004 mm.

[0028] The diffusion layer 103 is formed by soft annealing after the first magnetic metal layer 101 and the second magnetic metal layer 102 are laminated. The diffusion layer 103 makes the whole structure have a strong bonding force. The formation mechanism is the atomic diffusion and physical and chemical reaction at the contact interface of the two materials. The main driving force of the reaction is the Gibbs free energy difference and atomic concentration difference during multiple high-temperature annealing in the processing of the laminated metal strip, such as stamping and extrusion of mechanical devices. Generally, when the materials are laminated by stacking, the materials will be deformed and damaged on the surface, and a macro mechanical bite will be formed at the contact interface. The strength of the bite is generally weak, so a diffusion annealing is usually performed in a protective atmosphere or vacuum environment within a short time (e.g. 168 hours) after lamination. The atoms on both sides of the interface diffuse into each other, a physical and chemical reaction occurs, an intermetallic compound is generated, and an interatomic metallurgical bond is formed, thereby enhancing the bonding strength between adjacent layers.

[0029] The 4J52 alloy material has strong magnetism, and its magnetic permeability is about 10000 H / m at room temperature. In comparison, the magnetic permeability of the iron-silicon alloy material is about 3000 H / m. In this binary composite configuration, the significant difference in Curie temperature and magnetism between the two metal layers endows the soft magnetic heating susceptor 1 with the specific function of providing signal feedback when coupled with the high-frequency alternating magnetic field generated by the smoking set, i.e. providing physical signal feedback related to electrical or magnetic properties to the coil and electronic circuit as the temperature changes.

[0030] The diffusion layer 103 formed by the first magnetic metal layer 101 made of iron-nickel alloy and the second magnetic metal layer 102 made of iron-silicon alloy mainly contains nickel-silicon intermetallic compounds such as Ni3Si.

[0031] The intermetallic compound plays a role of microcosmic interatomic metallurgical bonding, compared with the aforementioned macroscopic mechanical interlocking, so that the bonding between layers is more compact, the bonding strength is higher, and the bonding is more stable. The intermetallic compound Ni3Si has high strength and creep resistance, has an interface strengthening effect, and connects the iron-nickel alloy layer and the iron-silicon alloy layer through Ni3Si metallurgical bonding. The high strength of Ni3Si can inhibit crack propagation and improve the fatigue resistance and peeling resistance of the overall structure. The intermetallic compound Ni3Si has a low diffusion rate after forming, and as the final product of the diffusion reaction, the Ni3Si layer can inhibit atomic diffusion during subsequent storage and stabilize the interface structure. The thermal expansion coefficient of the intermetallic compound Ni3Si is between Fe-Ni and Fe-Si, which can relieve the interface thermal stress and reduce the risk of delamination under high-temperature processing and working.

[0032] As described above, the strip-shaped susceptor raw material is usually a whole intact plate to be cut into a plurality of pieces of a predetermined size for actual use. In the production process, the cutting machine is usually used to automatically cut the to-be-cut plate to obtain small pieces of sheet, so it is expected that the strip-shaped susceptor raw material has low hardness, thin thickness, and weak rigidity, that is, in the form of "soft state", so as to reduce the wear of the cutter and the deformation of the cut-off part. The "soft state" described in the present application is not soft in daily life, but a statement of material hardness. The "soft state" is set to have a Vickers hardness HV0.2 (using a small load of 0.2 kg test force) of less than 200. In this case, on the one hand, it can be easily inserted into the aerosol-forming substrate, and on the other hand, it will not cause the problems of the prior art in the background art.

[0033] In the present embodiment, the hardness of the substrate before and after annealing of the above-mentioned configuration is experimentally detected. Before annealing, the substrate is in a hard state, and the average Vickers hardness HV0.2 is 247.6. The annealing temperature is set to be 750°C and 900°C respectively, and the holding time is set to be 5 minutes, 10 minutes, 15 minutes, 20 minutes and 40 minutes respectively. Before and after annealing, the hardness of the upper and lower surfaces of the substrate is tested. A micro Vickers hardness tester is used, and the method is GBT4340.1-2009 Metal Material Vickers Hardness Test Method. The test force is 0.2 kg, the indenter holding time is 15 seconds, and the average value of 3 test points is taken as the test data. The average value of the two surface test results under each annealing condition is taken as the final average Vickers hardness of the substrate. The effects of annealing temperature and time on hardness are plotted in Figure 4

[0034] ​The results show that there is a significant difference in hardness between the hard state material and the soft state (annealed state) material; at the same temperature, the hardness decreases rapidly with the increase of annealing time; at the same time, increasing the temperature is conducive to reducing the hardness of the annealed material; when there is a long enough annealing time, the hardness tends to be stable, indicating that at this time it has approached the lower limit of the hardness of the material, i.e. in the configuration of the magnetic heating element 1 in this embodiment, the minimum hardness of the magnetic heating element 1 is between 151.3-152.3.

[0035] Therefore, before the magnetic heating susceptor 1 is used as a final product, it should be adjusted to a soft state by a proper annealing process, and the target average Vickers hardness HV0.2 is set to be less than 200, preferably less than 160, i.e. to achieve a complete annealing effect and reduce the hardness as much as possible; the preferred annealing temperature is set in the range of 700-950℃.

[0036] It is found that the metal will work harden in repeated cold working, and the microstructure and mechanical properties of the material will change as follows.(1) The dislocation density increases: During plastic deformation, the dislocation density inside the metal increases continuously. Dislocation is an area of incomplete atomic arrangement in the crystal, and as the degree of deformation increases, the interaction between dislocations increases, forming obstacles such as entanglement and immobile dislocations, which increases the resistance to dislocation movement, thereby increasing the strength of the metal.(2) Crystal lattice distortion and subgrain boundary formation: During cold working, the crystal lattice of the metal is severely distorted, and a large number of subgrain boundaries are generated by grain fragmentation. These changes cause atoms to move away from their equilibrium positions, increasing internal stress and further increasing the strength of the metal. Work hardening significantly increases the difficulty of further processing (extrusion, stretching, and cutting, etc.) of the material. The principle of annealing softening of metal materials mainly includes dislocation rearrangement, recrystallization process, and stress relief. When the metal is plastically deformed, a large number of entangled dislocations are formed inside the grain. These dislocations will rearrange to form a polygonal structure called a subgrain boundary when heated to a slightly higher temperature. At this time, the number of dislocations does not decrease significantly, so the mechanical properties of the metal do not change much. However, when the metal is heated to the recrystallization temperature (about 0.4 times the melting point temperature), new grains nucleate at the subgrain boundaries, eliminating most of the dislocations, resulting in a significant decrease in the number of dislocations. The stress (residual stress and cooling stress) is relaxed by internal local plastic deformation (when the stress exceeds the yield strength of the material at that temperature) or local relaxation process (when the stress is less than the yield strength of the material at that temperature) to achieve the purpose of stress relief. The annealing process uses the above basic principles to make the metal have low strength and high plasticity, which is convenient for further processing.

[0037] Example Two

[0038] In the first embodiment, the first magnetic metal layer and the second magnetic metal layer are made of magnetic iron-nickel alloy and iron-silicon alloy, respectively. Both of them can also be made of ferromagnetic or ferrimagnetic metal with suitable Curie temperature, including elemental metal such as iron, nickel and cobalt, or single alloy such as magnetic stainless steel wire (ferritic stainless steel, martensitic stainless steel and some cold-worked austenitic stainless steel), various soft magnetic alloy (permalloy, iron-based amorphous alloy, cobalt-based amorphous alloy, iron-based nanocrystalline alloy, iron-silicon-aluminum alloy, invar alloy), and Kovar alloy.

[0039] The third embodiment

[0040] Based on the first and second embodiments, the soft magnetic heating susceptor 1 further comprises a third metal layer, and the diffusion layers are generated by the reaction of the third metal layer with the first magnetic metal layer and the second magnetic metal layer, respectively. As shown in the multi-element composite structure, two diffusion layers are not shown. Figure 5

[0041] The average thickness of the first magnetic metal layer 101 is 0.02 mm, and the material is iron-nickel-based glass sealing alloy 4J42; the average thickness of the second magnetic metal layer 102 is 0.08 mm, and the material is ferritic stainless steel S40920; the material of the third metal layer 104 is aluminum. The reaction diffusion layer 103 of the third metal layer 104 with the first magnetic metal layer 101 and the second magnetic metal layer 102 is not shown in the figure, and a compound structure similar to the first embodiment is generated based on the third metal layer 104. Since the third metal layer 104 does not have magnetism, its elongation rate is as high as 25%, and it is relatively soft. Aluminum as an intermediate transition layer improves the processability in the compounding process, reduces the required temperature, pressure and deformation amount during calendering compounding.

[0042] In the preferred embodiment, a surface coating layer 105 is further included on the upper and lower surfaces (towards the outer side) of the soft magnetic heating susceptor 1, with an average thickness of about 0.002 mm and a material of nickel, which is deposited on the surface by electroplating or chemical plating. The surface plating layer in this configuration can play three basic roles: protecting the surface to prevent rust and oxidation, providing a smooth and bright surface to improve aesthetics, and using its magnetic properties to provide a second temperature marker material near the Curie temperature (354°C).

[0043] In some embodiments, the third metal layer 104 can also be made of other various relatively soft metals, such as aluminum alloy, copper and copper alloy, silver and silver alloy. The specific combination can be pre-combined on the surface of the raw material to be combined by suitable methods such as electroplating, chemical plating, cladding, sputtering, lamination, and coating; it can also be configured between the first magnetic metal material and the second magnetic metal material by means of collaborative compounding.

[0044] ​In certain embodiments, the surface coating can also include metals of non-magnetic materials, such as chromium, copper, silver, gold, zinc, and the like; the surface coating can also include high-temperature resistant ceramic coatings and silicone coatings. These surface coatings can be applied using suitable methods, such as electroplating, electroless plating, cladding, sputtering, lamination, thermal spraying, cladding, spraying, coating, and sintering, among other process methods.

[0045] The disclosed embodiments of the utility model are merely specific embodiments of the utility model, and are intended to clearly illustrate the embodiments of the utility model, and should not be regarded as limiting the scope of the utility model, and of course, the scope of the claims of the utility model should not be limited in this way. For those skilled in the art, equivalent changes, modifications, variations and the like made by the claims of the utility model without creative labor still belong to the scope covered by the utility model, and should be included in the protection scope of the claims of the utility model.

Claims

1. A soft state magnetic heating susceptor, characterized by, The soft magnetic heating susceptor comprises a first magnetic metal layer and a second magnetic metal layer, the Curie temperature of the material of the first magnetic metal layer is between 400-550℃, and the Curie temperature of the material of the second magnetic metal layer is between 650-1200℃. There is a diffusion layer intermetallic compound between the first magnetic metal layer and the second magnetic metal layer, which is generated by atomic diffusion reaction; The surface average Vickers hardness HV0.2 of the soft magnetic heating susceptor is less than 200.

2. The soft state magnetic heating susceptor of claim 1, wherein, The average thickness of the diffusion layer is less than 0.002mm.

3. The soft state magnetic heating susceptor of claim 1, wherein, The diffusion layer is formed by soft annealing after the first magnetic metal layer and the second magnetic metal layer are laminated.

4. The soft state magnetic heating susceptor of claim 1, wherein, The first magnetic metal layer and the second magnetic metal layer form interatomic metallurgical bonding at the diffusion layer.

5. The soft state magnetic heating susceptor of claim 1, wherein, The material of the first magnetic metal layer comprises iron-nickel alloy, and the material of the second magnetic metal layer comprises iron-silicon alloy, and the main chemical component of the diffusion layer is nickel-silicon compound, iron-silicon compound, or a combination of the two.

6. The soft state magnetic heating susceptor of claim 1, wherein, The soft magnetic heating susceptor further comprises a third metal layer and two diffusion layers, which are respectively generated by the reaction of the third metal layer with the first magnetic metal layer and the second magnetic metal layer.

7. The soft state magnetic heating susceptor of claim 1, wherein, In the temperature range of 20-400℃, the magnetic permeability of the first magnetic metal is higher than that of the second magnetic metal at the same temperature.

8. The soft state magnetic heating susceptor of claim 1, wherein, The first magnetic metal layer and the second magnetic metal layer are further provided with a protective layer towards the outer side.

9. An electromagnetic cartridge characterized by The soft magnetic heating susceptor comprises a first magnetic metal layer and a second magnetic metal layer, the Curie temperature of the material of the first magnetic metal layer is between 400-550℃, and the Curie temperature of the material of the second magnetic metal layer is between 650-1200℃.

10. A soft state magnetic heating susceptor sheet material, characterized by, There is a diffusion layer intermetallic compound between the first magnetic metal layer and the second magnetic metal layer, which is generated by atomic diffusion reaction; The surface average Vickers hardness HV0.2 of the soft magnetic heating susceptor is less than 200. The average thickness of the diffusion layer is less than 0.002mm. The diffusion layer is formed by soft annealing after the first magnetic metal layer and the second magnetic metal layer are laminated. The first magnetic metal layer and the second magnetic metal layer form interatomic metallurgical bonding at the diffusion layer. The material of the first magnetic metal layer comprises iron-nickel alloy, and the material of the second magnetic metal layer comprises iron-silicon alloy, and the main chemical component of the diffusion layer is nickel-silicon compound, iron-silicon compound, or a combination of the two. The soft magnetic heating susceptor further comprises a third metal layer and two diffusion layers, which are respectively generated by the reaction of the third metal layer with the first magnetic metal layer and the second magnetic metal layer. In the temperature range of 20-400℃, the magnetic permeability of the first magnetic metal is higher than that of the second magnetic metal at the same temperature. The first magnetic metal layer and the second magnetic metal layer are further provided with a protective layer towards the outer side. The soft magnetic heating susceptor comprises a first magnetic metal layer and a second magnetic metal layer, the Curie temperature of the material of the first magnetic metal layer is between 400-550℃, and the Curie temperature of the material of the second magnetic metal layer

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