WO2024037088A1 - Corps de chauffage par induction multicouche, son procédé de préparation et son utilisation - Google Patents

Corps de chauffage par induction multicouche, son procédé de préparation et son utilisation Download PDF

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Publication number
WO2024037088A1
WO2024037088A1 PCT/CN2023/095852 CN2023095852W WO2024037088A1 WO 2024037088 A1 WO2024037088 A1 WO 2024037088A1 CN 2023095852 W CN2023095852 W CN 2023095852W WO 2024037088 A1 WO2024037088 A1 WO 2024037088A1
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Prior art keywords
layer
induction heating
heating body
temperature
body according
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PCT/CN2023/095852
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English (en)
Chinese (zh)
Inventor
韩达
张恒
邹凌芳
周宏明
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深圳麦克韦尔科技有限公司
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Publication of WO2024037088A1 publication Critical patent/WO2024037088A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A24F40/46—Shape or structure of electric heating means
    • A24F40/465—Shape or structure of electric heating means specially adapted for induction heating
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/70—Manufacture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B22F3/04—Compacting only by applying fluid pressure, e.g. by cold isostatic pressing [CIP]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/1003—Use of special medium during sintering, e.g. sintering aid
    • B22F3/1007—Atmosphere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers

Definitions

  • This application belongs to the technical field of induction heating materials, and specifically relates to a multi-layer induction heating body and its preparation method and application.
  • Iron-based alloys have high magnetic permeability and fast electromagnetic induction heating rates. Therefore, wireless temperature control sensors used for inductively heating aerosol-forming substrates generally use iron or iron-based alloys, and the most typical material is stainless steel.
  • the sensor made of a single material, stainless steel has the disadvantage of low temperature control accuracy, that is: usually the required temperature control range is much lower than the Curie temperature point of the stainless steel material, and small changes in heating current within its temperature control range will correspond to the sensor. Large changes in temperature will lead to low temperature control accuracy or even inaccurate temperature control.
  • the Curie temperature point of iron-based alloys is very high, using a single-layer stainless steel strip as a sensor can only heat it to form an aerosol, but cannot limit the maximum temperature through the characteristics of the material itself.
  • Typical 430L stainless steel The Curie temperature is above 700°C, and based on the national standard, the maximum temperature at which aerosols are usually generated is lower than 350°C. Therefore, a temperature threshold control program needs to be added to the microcontroller, which will make the structure of the induction heating device complex.
  • the purpose of this application is to overcome the low temperature control accuracy of single-material sensors in the prior art, as well as the high Curie temperature point of the existing single-material heating element, which only requires heating within the required controllable temperature range. It is practical and has no self-limiting temperature problem, thus providing a multi-layer induction heating body and its preparation method and application.
  • the present application provides a multi-layer induction heating body, including a first susceptor material layer and a second susceptor material layer, and a transition layer disposed between the first susceptor material layer and the second susceptor material layer.
  • the thickness of the first sensor material layer is 20-150 microns
  • the thickness of the second sensor material layer is 20-150 microns
  • the thickness of the transition layer is 5-50 microns.
  • the first sensor material, the transition layer, and the second sensor material layer are formed by sintering.
  • the multi-layer induction heating body further includes a protective layer disposed on the outside of the first susceptor material layer and/or the second susceptor material layer away from the transition layer.
  • the thickness of the protective layer is 1-10 microns.
  • the multi-layer induction heating body is of sheet type, tube type, cup type or pot type.
  • the material of the transition layer is metal, alloy, ceramic or any combination between them.
  • the material of the first sensor layer is at least one of nickel and nickel-chromium alloy
  • the material of the second sensor layer is at least one of iron and iron-based alloy.
  • This application also provides a method for preparing the above-mentioned multi-layer induction heating body, which includes the following steps:
  • the temperature of the hot isostatic pressing treatment is 65-85°C
  • the time is 0.1-1h
  • the pressure is 5-45MPa.
  • the debinding treatment temperature is 250-550°C and the time is 1-10h;
  • the sintering temperature is 1100-1400°C and the sintering time is 0.5-15h.
  • the following steps are also included: according to the composition of the raw materials of each layer, add PVB binder and alcohol solvent to the powder of the corresponding material, and put it into a ball mill tank. Perform ball milling to prepare the corresponding slurry for tape casting.
  • the ball milling time for preparing the corresponding slurry for tape casting is 2-4 hours.
  • the multi-layer induction heating body can be a sheet type, or a tube type, cup type or pot type that is processed from the sheet type.
  • This application also provides an application of the above-mentioned multi-layer induction heating body or the multi-layer induction heating body prepared by the above-mentioned preparation method in the field of magnetic induction heating.
  • the present application provides a multi-layer induction heating body in which the first sensor material and the second sensor material have different Curie temperature points, and at least one of the materials has a Curie temperature point lower than 400°C.
  • the Curie temperature of the first susceptor material is between 200-400°C; optionally, it is above 380°C.
  • the Curie temperature of the second susceptor material is between 400-1000°C.
  • the material of the first sensor layer can be elemental nickel, nickel-chromium alloy, surface-treated nickel, surface-treated nickel-chromium alloy, etc.
  • the Curie temperature point of nickel is around 350°C.
  • the material of the second sensor layer can be iron or an iron-based alloy, such as ferritic stainless steel.
  • a typical ferritic stainless steel is 430L.
  • the Curie temperature point of 430L is around 700°C.
  • a transition layer is provided between the first susceptor and the second susceptor, and the material of the transition layer is a metal element, an alloy, a ceramic, or any combination thereof;
  • the transition layer between the first susceptor material layer and the second susceptor material layer is preferably a metal element, alloy or composite metal with high thermal conductivity and high electrical conductivity.
  • the transition layer material can be weakly magnetic or non-magnetic metal, such as austenitic stainless steel 316L.
  • Magnetic metal materials can also be used as transition layer materials.
  • the transition layer can be iron-chromium-aluminum alloy.
  • the surface of iron-chromium-aluminum alloy has a natural protective film of aluminum oxide, which has good high-temperature chemical compatibility with most metals and is very suitable for use as a transition layer material.
  • Ceramics can also be used as transition layer materials. Considering the good high-temperature compatibility between ceramics and metals, ceramics are an ideal transition layer material.
  • a protective layer can be selectively provided on one or both sides of the multi-layer susceptor.
  • the protective layer material can be metal, ceramic, glass or any combination between them. things.
  • the multi-layer induction heating body provided by this application can provide a characteristic temperature point.
  • the temperature of the heating element can be controlled near this characteristic temperature through electronic control, and the characteristic temperature can be adjusted according to the material composition.
  • a typical temperature can be at Control between 150-400°C.
  • heating can be achieved in two temperature ranges between 150-260°C and 250-400°C.
  • wireless temperature control can be achieved based on the one-to-one current-temperature relationship.
  • the multi-layer induction heating body provided by this application is suitable for induction heating aerosol-forming sensor heating materials for electronic cigarettes, aerosol-forming sensor heating materials for medical atomization, or beauty instruments and other scenarios that require induction heating and temperature control.
  • the multi-layer induction heating body temperature control logic provided by this application:
  • the multi-layer induction heating body is heated.
  • the electronic control will detect an initial current; as the temperature of the heating body increases, the magnetic resistance of the heating body will increase, and the corresponding electronic control will detect that the current becomes smaller;
  • the temperature of the heating body continues to rise, and the temperature rises close to the Curie temperature point of the low Curie temperature material in the multi-layer induction heating body, the low Curie temperature material begins to gradually lose magnetism, which will lead to the overall magnetic field of the heating body. The resistance becomes smaller, so the apparent current detected by the electronic control will gradually increase. At this time, a minimum current inflection point (I 1 ) will appear.
  • the current detected by the electronic control is different from the temperature of the heating body.
  • One-to-one correspondence through this one-to-one correspondence between the current and the temperature of the heating body, a standard curve can be established, so that wireless temperature control can be achieved; as the temperature further increases, the material at the low Curie temperature point in the heating body continues to lose Magnetism, when the sensor material completely loses magnetism at the low Curie temperature point, another maximum current inflection point (I 2 ) will appear.
  • I 2 maximum current inflection point
  • electromagnetic induction heating is dominated by materials with high Curie temperature points.
  • the current will become smaller due to the increase in the magnetic resistance of materials with high Curie temperature points.
  • the multi-layer induction heating body proposed in this application can control the characteristic current value I 1 , the characteristic temperature value T 1 , the temperature control standard curve and the maximum threshold temperature T 2 by regulating the metal phase components at the high Curie temperature point and the low Curie temperature point. adjustable.
  • a sensor with a conventional two-layer physical bonding structure is composed of a first sensor material and a second sensor material.
  • the resistance-temperature curve of the sensor component (Fig. 6, refer to Chinese patent document CN112739229A) has a minimum resistance value within a temperature range of ⁇ 5°C near the Curie temperature of the second sensor material. This minimum resistance value is used to calibrate the temperature at a certain point to achieve temperature control.
  • the first susceptor material is mainly used for heating, and the second susceptor material is used as a temperature marker.
  • the magnetic properties of the second susceptor change from ferromagnetic or ferrimagnetic to paramagnetic. , accompanied by a temporary change in its resistance.
  • This temperature control logic can only calibrate the temperature point of the Curie temperature of the second sensor material, which is limited by the material and has a single temperature point, so interval temperature control cannot be performed.
  • the other is to use a single stainless steel piece for the susceptor.
  • the temperature of the susceptor is between the apparent ohmic resistance determined by the DC supply voltage of the DC power supply and the DC current drawn from the DC power supply.
  • the temperature control logic has high requirements on the change amount of the apparent ohmic resistance of the stainless steel sheet and the corresponding relationship between temperature.
  • the corresponding relationship between the common stainless steel sheets usually means that the change amount of the apparent ohmic resistance is too small when the temperature range is certain, and it cannot be accurately controlled. temperature.
  • the multi-layer induction heating body provided by this application includes at least a three-layer structure of a first sensor material layer, a second sensor material layer and a transition layer, so that the multi-layer induction heating body has the functions of heating and temperature control at the same time, and the temperature control accuracy is high.
  • the heating process is uniform and stable, and there will be no cracking, deformation, etc.
  • the thermal stability of the multi-layer induction heating body is significantly improved, thereby ensuring the stability and consistency of the induction heating sheet during the heating process.
  • This application provides a new method for preparing multi-layer sensor sheets based on powder sintering.
  • Adding a transition layer between the first sensor and the second sensor can effectively solve the problem of mechanical, physical and chemical incompatibility between the two sensor materials and facilitate full Take advantage of the temperature control properties of both receptors.
  • the setting of the transition layer can also avoid the mutual influence of the first susceptor material layer and the second susceptor material layer during the heating process, achieving precise heating and temperature control.
  • the transition layer is very thin, only 5-50 microns.
  • This arrangement can accelerate the direct heat exchange between the first susceptor and the second susceptor, which is conducive to the first susceptor and the second susceptor directly and quickly reaching thermal equilibrium. Effect. Combining the first sensor and the second sensor as a whole allows the whole to quickly reach thermal equilibrium during the heating process, which is conducive to precise temperature control.
  • the transition layer can be prevented from affecting the heating characteristics induced by the first susceptor material layer and the second susceptor material layer.
  • the multi-layer induction heating body limits the molding method to the sintering method, so that the two susceptor materials can be easily combined, effectively expanding the range of susceptor material combinations. In addition, it can also improve the interface bonding force between the two susceptor material layers and avoid the peeling of the interface microstructure, deformation and even cracking of the heating body due to the difference in the physical properties of the two susceptor materials in the physical pressing method in the existing technology. and other problems, which is greatly conducive to maintaining the consistency of the temperature control characteristics of the heating body during the heating process. In addition, in the multi-layer heating body in the prior art, the first susceptor material layer and the second susceptor material layer are generally arranged in close contact.
  • the multi-layer induction heating body provided by the present application also includes a protective layer disposed on the outside of the first sensor material layer and/or the second sensor material layer away from the transition layer. This arrangement can improve the resistance of the multi-layer induction heating body. High temperature and corrosion resistance.
  • the preparation method of the multi-layer induction heating body provided by this application has a simple and mature preparation process, is easy to implement, and greatly reduces the manufacturing cost.
  • Figure 1 is a schematic structural diagram of the multi-layer induction heating body provided by this application.
  • Figure 2 is a current-temperature corresponding relationship curve during the electromagnetic induction heating process of the heating body provided in Embodiment 1 of the present application;
  • Figure 3 shows the current-temperature during the electromagnetic induction heating process of the heating body provided in Embodiment 2 of the present application. Correspondence relationship curve;
  • Figure 4 is a current-temperature corresponding relationship curve during the electromagnetic induction heating process of the heating body provided in Embodiment 3 of the present application;
  • Figure 5 is a current-temperature corresponding relationship curve during the electromagnetic induction heating process of the heating body provided in Embodiment 4 of the present application;
  • Figure 6 is a resistance-temperature relationship curve in the process of using electromagnetic induction to heat a sensor prepared by conventional physical bonding methods in the prior art.
  • This embodiment provides a multi-layer induction heating body, as shown in Figure 1, including three layers: first sensor material layer 1 (Ni powder)/transition layer 2 (stainless steel 316L)/second sensor material layer 3 (stainless steel 430L)
  • the preparation method of the composite metal sheet includes the following specific steps:
  • the obtained blanks are sequentially laminated according to Ni blanks, stainless steel 316L blanks and stainless steel 430L blanks and then subjected to hot isostatic pressing to obtain a composite blank, which is to be fired; among them, the hot isostatic pressing treatment
  • the temperature is 70°C
  • the pressure is 20MPa
  • the time is 10 minutes.
  • the multi-layer induction heating body provided in this embodiment is heated by electromagnetic induction (electromagnetic heating frequency 6.78MHz).
  • electromagnetic induction electromagnetic heating frequency 6.78MHz.
  • I 1 and I 2 are respectively The current inflection point, whose corresponding temperatures are T 1 and T 2 ), and this interval of different temperatures corresponding to the sudden change stage of the current (the T 1 and T 2 temperature intervals corresponding to I 1 and I 2 ), can be used as the temperature of the heating body. control interval.
  • the heating body has the characteristic of a maximum temperature that it can be heated to. As shown in Figure 2, neither the current nor the temperature continues to increase. This characteristic can play a temperature self-protection role in the sensor assembly.
  • This embodiment provides a multi-layer induction heating body, as shown in Figure 1, including a first sensor material layer
  • the preparation method of the three-layer composite metal sheet of 1 (Ni powder)/transition layer 2 (La 0.6 Sr 0.4 Fe 0.8 Sc 0.2 O 3 )/second sensor material layer 3 (stainless steel 430L) includes the following specific steps:
  • the obtained green body is sequentially laminated according to the Ni green body, La 0.6 Sr 0.4 Fe 0.8 Sc 0.2 O 3 green body and stainless steel 430L green body, and then subjected to hot isostatic pressing treatment to obtain a composite green body, which is to be fired;
  • the temperature of hot isostatic pressing is 70°C
  • the pressure is 20MPa
  • the time is 10 minutes;
  • This embodiment provides a multi-layer induction heating body.
  • the difference from Embodiment 1 is that nickel alloy is used. 1J36 powder, instead of Ni powder.
  • This embodiment provides a multi-layer induction heating body.
  • the difference from Embodiment 1 is that other ferritic stainless steel 420 is used instead of stainless steel 430L.
  • Example 1 of this application specifically including:
  • Step 1 Cut the prepared induction metal sheet into standard sizes with a width of 8.6mm and a length of 16mm;
  • Step 2 Attach a thermocouple to the above-mentioned standard size metal sheet, and the thermocouple is used for temperature measurement;
  • Step 3 Place the above-mentioned induction heating piece attached to the thermocouple at the center of the electromagnetic induction heating coil, and fix the heating element;
  • Step 4 Set the voltage of the electromagnetic induction heating coil to 7.5V, set the current to 2.7A, 2.8A, 2.85A, 2.9A and 2.95A respectively, and read the stable temperature of the thermocouple in different current modes (heat for 60s, Test the final stable temperature).
  • Step 5 Repeat steps 1-4, test 4 heating pads, and evaluate the consistency of the heating pads.
  • test results are as follows: for a single heating piece, there is a one-to-one correspondence between the current and the temperature of the induction piece; for different heating elements (4 randomly selected heating pieces are selected to test the consistency of the heating pieces), the consistency of the heating pieces
  • the positive and negative deviations of the temperature control temperatures of different metal sheets under different currents are within 3°C.
  • the specific test results are shown in the table below (the positive and negative deviations of the temperature control temperatures of other embodiments are also within 3°C, and will not be shown one by one. Specific test results):

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Induction Heating (AREA)

Abstract

Corps de chauffage par induction multicouche, son procédé de préparation et son utilisation. Le corps de chauffage par induction multicouche a la structure d'au moins trois couches, de sorte que le corps de chauffage par induction multicouche ait à la fois les fonctions de chauffage et de régulation de température, le processus de chauffage est uniforme et stable, et les conditions de craquage, de déformation et analogues ne peuvent pas se produire. Par disposition d'une couche de transition (2) entre une première couche de matériau suscepteur (1) et une seconde couche de matériau suscepteur (3), la stabilité thermique du corps de chauffage par induction multicouche est améliorée, ce qui permet d'assurer la stabilité et la cohérence d'une feuille de chauffage par induction dans le processus de chauffage, de résoudre efficacement le problème d'incompatibilité mécanique, physique et chimique de deux matériaux suscepteurs, et de faciliter l'utilisation complète des caractéristiques de régulation de température de deux suscepteurs. L'agencement de la couche de transition (2) peut également éviter l'effet mutuel de la première couche de matériau suscepteur (1) et de la seconde couche de matériau suscepteur (3) dans le processus de chauffage, ce qui permet d'obtenir un chauffage et une régulation de température précis.
PCT/CN2023/095852 2022-08-19 2023-05-23 Corps de chauffage par induction multicouche, son procédé de préparation et son utilisation WO2024037088A1 (fr)

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CN202211000959.6A CN115299653A (zh) 2022-08-19 2022-08-19 一种多层感应加热体及其制备方法和应用
CN202211000959.6 2022-08-19

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CN117774454A (zh) * 2024-02-19 2024-03-29 深圳市卓亮迪科技有限公司 一种多层感受体复合材料及其制备方法

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