CN117837819A - Heating element, preparation method thereof and aerosol generating device - Google Patents
Heating element, preparation method thereof and aerosol generating device Download PDFInfo
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- CN117837819A CN117837819A CN202211216229.XA CN202211216229A CN117837819A CN 117837819 A CN117837819 A CN 117837819A CN 202211216229 A CN202211216229 A CN 202211216229A CN 117837819 A CN117837819 A CN 117837819A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 500
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- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000002131 composite material Substances 0.000 claims abstract description 57
- 229910052751 metal Inorganic materials 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 22
- 229910001220 stainless steel Inorganic materials 0.000 claims description 93
- 239000010935 stainless steel Substances 0.000 claims description 91
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 83
- 239000000463 material Substances 0.000 claims description 54
- 229910000838 Al alloy Inorganic materials 0.000 claims description 22
- -1 iron-chromium-aluminum Chemical compound 0.000 claims description 19
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 16
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- 238000000059 patterning Methods 0.000 claims description 10
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 7
- 238000013329 compounding Methods 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
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Classifications
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- 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
-
- 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
Landscapes
- Resistance Heating (AREA)
Abstract
The application discloses heat-generating body and preparation method, aerosol generating device thereof, the heat-generating body sets up in aerosol generating device for heating aerosol forms the matrix, and volatilize at least one component in the aerosol formation matrix and form the aerosol that supplies the user to inhale, the heat-generating body includes: the composite heating body comprises a first heating layer and a second heating layer which are arranged in a laminated mode, wherein the resistivity of the first heating layer is smaller than that of the second heating layer, and the first heating layer and the second heating layer are made of metal. The composite heating body is of an integral structure, and two heating layers with different resistivities are arranged in a laminated mode to form gradient heat distribution, so that the heating performance of the heating body can be enhanced, meanwhile, the performance with excellent resistivity and resistance temperature coefficient is obtained, and therefore the heat utilization efficiency and the taste of the aerosol are improved; and the temperature control and dry burning prevention functions can be realized.
Description
Technical Field
The application relates to the technical field of smoking sets, in particular to a heating element, a preparation method thereof and an aerosol generating device.
Background
With the rapid development of the electronic aerosol generating device, the heating element of the electronic aerosol generating device becomes a core component to determine the overall design and the performance quality level of the aerosol generating device. Existing aerosol generating devices rely on heating different forms of aerosol generating substrates (e.g., tobacco tar) to generate an aerosol and deliver the aerosol to a user for inhalation. The heating elements commonly used at present are two types, namely a porous ceramic heating element and a cotton core heating element and a heating wire;
on one hand, the traditional plane cotton core heating element achieves the effect of smoke emission through the atomization of tobacco tar absorbed by a heating wire heating oil body, and has better taste and smoke quantity; the aerosol and air are arranged in the atomizing cavity, the heat consumption is relatively small, the difference of the heat consumption of the two sides of the heating element is large, and the heating element is uneven in heating, so that the heating efficiency of the heating element is reduced, and the side close to the atomizing cavity is easy to burn.
On the other hand, metals are good conductors, and generally, metals are used as heating elements in the electronic aerosol generating device, and common heating materials are alloy materials such as iron-chromium-aluminum alloy and nickel-chromium alloy, however, the conventional heating materials made of alloy materials have the following defects, which limit the application of the heating materials in the aerosol generating device:
(1) The Fe-Cr-Al alloy has higher resistivity, but the surface of the Fe-Cr-Al alloy is easy to oxidize, and particularly, fe ions are easy to be separated out after the Fe-Cr-Al alloy is contacted with tobacco tar for a long time so that atomized liquid changes color; in addition, the iron-chromium-aluminum alloy has a smaller resistance temperature coefficient, can not realize the temperature control function of the heating material, and can not play a role in preventing dry combustion.
(2) The nickel-chromium-iron alloy has high resistivity and small resistance temperature coefficient, can have better heating performance and can realize temperature control function, but can separate nickel ions after being contacted with atomized liquid for a long time, and does not meet the safety requirement.
(3) The 316 stainless steel has the characteristic of high safety, but has lower resistivity (about half of that of the iron-chromium-aluminum alloy), so that when the 316 stainless steel is used as a heating body, if good heating efficiency needs to be met, a larger size needs to be designed, the requirement of micro-quantization of the electronic aerosol generating device cannot be met, and inconvenience is brought to size design.
Therefore, in order to solve one or more problems of the heating efficiency, the temperature control, the dry heating prevention, the safety, the prevention of the color change of the atomized liquid, the inconvenient design size and the like of the heating element, a new heating element is researched, and the problem needs to be solved in the field of electronic cigarettes.
Disclosure of Invention
The application provides a heating element and a preparation method thereof, aerosol generating device, and the heating element of the application has the advantages of high heating efficiency, temperature control, dry combustion method prevention, proper size and high safety, and can improve the comprehensive performance of the heating element.
In a first aspect, the present application provides a heating element provided in an aerosol-generating device for heating an aerosol-forming substrate and volatilizing at least one component of the aerosol-forming substrate to form an aerosol for inhalation by a user, the heating element comprising:
the composite heating body comprises a first heating layer and a second heating layer which are arranged in a laminated mode, wherein the resistivity of the first heating layer is smaller than that of the second heating layer, and the first heating layer and the second heating layer are made of metal. In some embodiments, the material of the first heat generating layer includes at least one of a first stainless steel and a TA-type titanium alloy.
In some embodiments, the first stainless steel comprises at least one of stainless steel 304, stainless steel 316L, and stainless steel 317L.
In some embodiments, the TA-type titanium alloy includes at least one of titanium alloy TA1, titanium alloy TA2, and titanium alloy TA 3.
In some embodiments, the ratio of the thickness of the first heat-generating layer to the composite heat-generating body is (0.1 to 0.9): 1.
in some embodiments, the material of the second heating layer includes at least one of a second stainless steel, an iron-chromium-aluminum alloy, a nickel-chromium-iron alloy, and a TC-type titanium alloy.
In some embodiments, the second stainless steel comprises at least one of stainless steel 904, stainless steel 254smo, and stainless steel N08926.
In some embodiments, the iron-chromium-aluminum alloy includes at least one of 0Cr25Al5 and 0Cr27Al7Mo 2;
in some embodiments, the nichrome comprises at least one of Cr20Ni80, cr15Ni60, and Cr20Ni 35.
In some embodiments, the TC-type titanium alloy includes at least one of titanium alloy TC4, titanium alloy TC7, and titanium alloy TC 10.
In some embodiments, the material of the second heating layer includes at least one of an iron-chromium-aluminum alloy and a nickel-chromium-iron alloy, and the composite heating body further includes a third heating layer stacked on the surface of the second heating layer, where the resistivity of the third heating layer is smaller than or greater than that of the second heating layer.
In some embodiments, the ratio of the total thickness of the first heat-generating layer and the third heat-generating layer to the thickness of the composite heat-generating body is (0.1 to 0.9): 1.
In some embodiments, the material of the third heat generating layer includes at least one of a first stainless steel and a TA-type titanium alloy.
In some embodiments, the first stainless steel comprises at least one of stainless steel 304, stainless steel 316L, and stainless steel 317L.
In some embodiments, the TA-type titanium alloy includes at least one of titanium alloy TA1, titanium alloy TA2, and titanium alloy TA 3.
In some embodiments, the single mass ratio of the surface metal impurity element of the heating element is less than 30%, and the metal impurity element includes any one of nickel, chromium and lead.
In some embodiments, the material of the second heating layer includes at least one of second stainless steel and TC-type titanium alloy, and the composite heating body further includes a third heating layer stacked on the surface of the first heating layer, and the third heating layer has a resistivity smaller than or greater than that of the first heating layer.
The ratio of the total thickness of the second heating layer and the third heating layer to the thickness of the composite heating body is (0.1-0.9): 1.
in some embodiments, the material of the third heat generating layer includes at least one of a first stainless steel and a TA-type titanium alloy.
In some embodiments, the material of the third heat generating layer includes at least one of a first stainless steel and a TA-type titanium alloy, and the first stainless steel includes at least one of stainless steel 304, stainless steel 316L, and stainless steel 317L.
In some embodiments, the material of the third heat generating layer includes at least one of a first stainless steel and a TA-type titanium alloy, and the TA-type titanium alloy includes at least one of a titanium alloy TA1, a titanium alloy TA2, and a titanium alloy TA 3.
In some embodiments, the thickness of the composite heat-generating body is 0.06mm to 0.2mm.
In some embodiments, the resistivity of the heating element is 0.79 μΩ·m to 1.49 μΩ·m.
In some embodiments, the temperature coefficient of resistance of the heating element is 77 ppm/DEG C to 100 ppm/DEG C.
In some embodiments, the difference in coefficient of thermal expansion between the first heat-generating layer and the second heat-generating layer is less than 4×10 -6 。
In some embodiments, at least one of the first heat-generating layer and the second heat-generating layer has an elongation at break of greater than 10%.
In some embodiments, the heating element has a set pattern.
In some embodiments, the projected area of the first heat generating layer on the second heat generating layer is less than or equal to the area of the surface of the second heat generating layer in contact with the first heat generating layer; or the projection area of the second heating layer on the first heating layer is smaller than or equal to the area of the surface of the first heating layer, which is contacted with the second heating layer.
In a second aspect, the present application provides a method for producing a heating element, comprising the steps of:
rolling and compounding the first heating layer and the second heating layer after stacking, wherein the resistivity of the first heating layer is smaller than that of the second heating layer, and the materials of the first heating layer and the second heating layer are metal;
and patterning the first heating layer and the second heating layer which are compounded to obtain a composite heating body, and thus obtaining the heating body.
In some embodiments, before the rolling and compounding the first heat generating layer and the second heat generating layer, a third heat generating layer is stacked on the surface of the second heat generating layer, and the resistivity of the third heat generating layer is smaller than or larger than that of the second heat generating layer; or (b)
And before rolling and compounding the first heating layer and the second heating layer, stacking a third heating layer on the surface of the first heating layer, wherein the resistivity of the third heating layer is smaller than or larger than that of the first heating layer.
In a third aspect, the present application provides an aerosol-generating device comprising:
a housing having a receiving cavity for receiving an aerosol-generating substrate;
The heating body is arranged in the accommodating cavity and is used for heating the aerosol generating substrate, and the heating body is the heating body according to the first aspect.
The technical scheme provided by the application has the following beneficial effects:
the composite heating body is of an integral structure, and comprises a first heating layer and a second heating layer which are arranged in a laminated mode, and gradient heat distribution is formed by adopting the laminated arrangement of the heating layers with two different resistivities, so that the heating performance of the heating body can be enhanced, the heating body has proper resistivity and resistance temperature coefficient in use, atomized liquid can be fully and quickly formed into aerosol by the heating body, the heat utilization efficiency is improved, the taste burst is improved, the taste of the aerosol is effectively improved, and the user experience is enhanced; the heating body of this application can also realize the control by temperature change and prevent dry combustion method function, and the size adaptation for the heating body has characteristics of light-weighted, small. For the single material heat-generating body, the heat-generating body of this application carries out gradient heat distribution in the thickness direction of heat-generating body, according to the difference of first zone of generating heat and second zone medium that generates heat in the heat-generating body, can improve the comprehensive properties of heat-generating body.
The application provides a 316L stainless steel and 904L stainless steel complex heat-generating body, its heat-generating body has the heat gradient to distribute at thickness direction, has higher resistance temperature coefficient and suitable resistivity, can realize accurate accuse temperature when guaranteeing heat-generating body heating efficiency, prevents the dry combustion method effect.
The application provides a TA1 titanium alloy and TC4 titanium alloy compound heat-generating body, its heat-generating body has the heat gradient to distribute in thickness direction, has higher resistivity and higher resistance temperature coefficient that can obtain, has the control by temperature change function when can realizing improving heating efficiency, and its comprehensive properties is excellent.
The application also provides a heating element compounded by 316L stainless steel, 0Cr25Al5 alloy and 316L stainless steel, which can ensure that the heating element obtains excellent resistivity and reasonable heat gradient distribution, the surface of the heating element can resist corrosion and oxidization, and the heating element can be repeatedly and circularly heated between 0 ℃ and 400 ℃ in the use process, so that the problems of layering and cracking can not occur; and a large amount of nickel ions are not separated out, so that the use safety of the heating body is improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a side view of a two-layer composite heat-generating body provided herein;
FIG. 2 is a side view of a heating element provided in the present application in which a first heating layer, a second heating layer, and a third heating layer are laminated in this order;
FIG. 3 is a side view of a heating element provided in the present application in which a third heating layer, a first heating layer, and a second heating layer are sequentially laminated;
FIG. 4 is a schematic diagram of a two-layer composite patterned heater provided herein;
FIG. 5 is a schematic diagram of a patterned heat generating body in which a first heat generating layer, a second heat generating layer, and a third heat generating layer are sequentially stacked;
FIG. 6 is a schematic diagram of a two-layer composite patterned heater with a localized area of only the first heat-generating layer provided herein;
FIG. 7 is a schematic diagram of a three-layer composite patterned heater with a localized area of only the first heat-generating layer provided herein;
fig. 8 is a schematic structural diagram of a patterned heat generating body with a local area being only the third heat generating layer provided in the present application.
The attached drawings are identified:
10-a composite heating body;
1-a first heat generating layer;
2-a second heat generating layer;
3-a third heat generating layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
In the description of the present specification, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" means two or more, unless specified or indicated otherwise; the terms "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected or detachably connected, integrally connected, or electrically connected; can be directly connected or indirectly connected through an intermediate medium.
The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In the description of the present application, it should be understood that the terms "upper," "lower," and the like in the embodiments of the present application are described in terms of angles shown in the accompanying drawings, and should not be construed as limiting the embodiments of the present application. In the context of this document, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on the other element or be indirectly on the other element through intervening elements.
The application provides a heat-generating body, this heat-generating body setting is in aerosol production device and soak in the aerosol, and the heat-generating body is connected with the power for heating aerosol formation matrix, when the smoking set is in operating condition, the heater can heat and place aerosol formation matrix for at least one component in the aerosol formation matrix volatilizees into aerosol, for the user to inhale.
Specifically, as shown in fig. 1, the heating element includes:
the composite heating body 10, the composite heating body 10 includes a first heating layer 1 and a second heating layer 2 which are laminated, the resistivity of the first heating layer 1 is smaller than that of the second heating layer 2, and the materials of the first heating layer 1 and the second heating layer 2 are all metals.
In the above scheme, the composite heating body 10 is of an integral structure, the composite heating body 10 comprises the first heating layer 1 and the second heating layer 2 which are arranged in a laminated manner, and gradient heat distribution is formed by adopting the laminated arrangement of the heating layers with two different resistivities, so that the heating performance of the heating body can be enhanced, the heating body has proper resistivity and resistance temperature coefficient in use, the heating body can not only be fully and quickly enabled to form aerosol, the heat utilization efficiency is improved, the taste burst is improved, the taste of the aerosol is effectively improved, and the user experience is enhanced; the heating body of this application can also realize the control by temperature change and prevent dry combustion method function, and the size adaptation for the heating body has characteristics of light-weighted, small. For the single material heat-generating body, the heat-generating body of this application carries out gradient heat distribution in the thickness direction of heat-generating body, according to the difference of first layer 1 and the second layer 2 medium that generates heat in the heat-generating body, can improve the comprehensive properties of heat-generating body.
The temperature coefficient of resistance (temperature coefficient of resistance, TCR for short) represents the relative change in resistance value in ppm/. Degree.C. when the temperature is changed by 1 degree Celsius. The heating element temperature coefficient of resistance of this application is suitable, can carry out good temperature control to the heating element, avoids because too high temperature can lead to the composition of tobacco tar, lead oily material to change and cause harm and reduce the taste to the human body, also can avoid the heating element high temperature to produce the problem of pasting the core simultaneously.
In some embodiments, the ratio of the thickness of the first heat-generating layer 1 to the composite heat-generating body 10 is (0.1 to 0.9): 1, specifically, the ratio of the thickness of the first heat-generating layer 1 to the composite heat-generating body 10 may be 0.1: 1. 0.2: 1. 0.3: 1. 0.4: 1. 0.5: 1. 0.6: 1. 0.7: 1. 0.8:1 and 0.9:1, etc. of course, may be other values within the above range, and it is not limited herein, and it is understood that the thickness of the heating element is the thickness of the composite heating element body 10, and the application may control the ratio of the thickness of the first heating layer 1 to the thickness of the composite heating element body 10, that is, the ratio of the thickness of the first heating layer 1 to the thickness of the second heating layer 2, so as to adjust the resistivity and the temperature coefficient of resistance of the heating element, and also adjust the heating temperature of the heating element, thereby realizing temperature control, and further meeting the diversified demands of users. If the ratio of the thickness of the first heat generating layer 1 to that of the composite heat generating body 10 is less than 0.1:1 or greater than 0.9:1, the process requirements of material preparation cannot be met, and the comprehensive performance of the heating element is reduced.
In some embodiments, the material of the first heat generating layer 1 includes at least one of a first stainless steel and a TA type titanium alloy. The first stainless steel includes at least one of stainless steel 304, stainless steel 316L, and stainless steel 317L. The TA-type titanium alloy includes at least one of titanium alloy TA1, titanium alloy TA2, and titanium alloy TA 3. The heating layer made of the material has the advantages of low resistivity, high temperature resistance and stable performance, and the metal impurity ion content is low or is not easy to separate out, so that the color change problem of the atomized liquid in the use process can be reduced.
In some embodiments, the material of the second heat generating layer 2 includes at least one of a second stainless steel, an iron-chromium-aluminum alloy, a nickel-chromium-iron alloy, and a TC-type titanium alloy. Exemplary second stainless steels include stainless steel 904, stainless steel 254smo, and stainless steel N08926, among others. The ferrochrome includes 0Cr25Al5, 0Cr27Al7Mo2, etc., the nichrome includes Cr20Ni80, cr15Ni60, cr20Ni35, etc., and the TC-type titanium alloy includes titanium alloy TC4, titanium alloy TC7, titanium alloy TC10, etc. The second heating layer 2 made of the material has higher resistivity, can generate more heat in the heating process, and improves the heating efficiency.
In some embodiments, when the material of the second heating layer 2 includes at least one of an iron-chromium-aluminum alloy and a nickel-chromium-iron alloy, the composite heating body 10 further includes a third heating layer 3 stacked on the surface of the second heating layer 2, that is, the heating body of the application is a sandwich-type stacked structure, as shown in fig. 2, the composite heating body 10 includes a first heating layer 1, a second heating layer 2 and a third heating layer 3 stacked, where the resistivity of the first heating layer 1 is smaller than the resistivity of the second heating layer 2, and the resistivity of the third heating layer 3 is smaller than or greater than the resistivity of the second heating layer 2. In some embodiments, the first heating layer 1 and the third heating layer 3 are located on the surface of the second heating layer 2 to form a protective layer, so that the second heating layer 2 is not in direct contact with the aerosol generating substrate, and the situation that the second heating layer 2 made of iron-chromium-aluminum alloy or nickel-chromium-iron alloy heats to cause volatile impurity ions and metal impurity ions to be separated out into the aerosol generating substrate can be avoided, so that the safety of the heating body is improved. When the resistivity of the third heating layer 3 is greater than that of the second heating layer 2, the first heating layer 1, the second heating layer 2 and the third heating layer 3 form a gradient temperature along the thickness direction, thereby realizing a temperature control function while enhancing the heating efficiency of the heating body.
In some embodiments, the thicknesses of the first heat-generating layer 1 and the third heat-generating layer 3 may be the same or may be different, only the ratio of the total thickness of the first heat-generating layer 1 and the third heat-generating layer 3 to the thickness of the heat-generating body 10 is required to satisfy (0.1 to 0.9): 1, specifically, the ratio of the total thickness of the first heat-generating layer 1 and the third heat-generating layer 3 to the thickness of the composite heat-generating body 10 may be 0.1: 1. 0.2: 1. 0.3: 1. 0.4: 1. 0.5: 1. 0.6: 1. 0.7: 1. 0.8:1 and 0.9:1, etc., and of course, may be other values within the above range, without limitation, the present application may adjust the heating element resistivity and the temperature coefficient of resistance by controlling the ratio of the total thickness of the first heating layer 1 and the third heating layer 3 to the thickness of the composite heating element body 10, thereby satisfying the diversified demands of users.
In some embodiments, when the material of the second heating layer 2 includes at least one of the second stainless steel and the TC-type titanium alloy, the composite heating body 10 further includes a third heating layer 3 disposed on the surface of the first heating layer 1, as shown in fig. 3, the heating element of the present application is a "sandwich" structure in which the third heating layer 3, the first heating layer 1 and the second heating layer 2 are stacked, and the resistivity of the third heating layer 3 is smaller than or greater than that of the first heating layer 1. In some embodiments, the resistivity of the third heat generating layer 3 is smaller than the resistivity of the first heat generating layer 1, so that the third heat generating layer 3, the first heat generating layer 1 and the second heat generating layer 2 form a gradient temperature in the thickness direction, thereby realizing a temperature control function while enhancing the heating efficiency of the heat generating body.
In some embodiments, the ratio of the total thickness of the second heat-generating layer 2 and the third heat-generating layer 3 to the thickness of the composite heat-generating body 10 satisfies (0.1 to 0.9): 1, specifically, the ratio of the total thickness of the second heat-generating layer 2 and the third heat-generating layer 3 to the thickness of the composite heat-generating body 10 may be 0.1: 1. 0.2: 1. 0.3: 1. 0.4: 1. 0.5: 1. 0.6: 1. 0.7: 1. 0.8:1 and 0.9:1, etc., and of course, may be other values within the above range, without limitation, the present application may control the ratio of the total thickness of the second heating layer 2 and the third heating layer 3 to the thickness of the composite heating body 10, thereby performing the adjustment of the heating body resistivity and the temperature coefficient of resistance, and thus may satisfy the diversified demands of users.
In some embodiments, the material of the third heat generating layer 3 includes at least one of a first stainless steel and a TA-type titanium alloy. It is understood that the materials of the first heat generating layer 1 and the third heat generating layer 3 may be the same or different. The application is not limited herein, and it can be understood that the first heating layer 1 and the third heating layer 3 with similar performance or complementary performance can be selected according to the user requirement, when the material of the second heating layer 2 comprises at least one of iron-chromium-aluminum alloy and nickel-chromium-iron alloy, the first heating layer 1 and the third heating layer 3 can both play a protective role on the second heating layer 2, so that the precipitation of harmful substances or metal impurity ions can be reduced after the heating element contacts with tobacco tar, and the safety performance of the heating element is improved.
In some embodiments, when the heating element is in a sandwich-type laminated structure, the single-phase mass ratio of the surface metal impurity element of the heating element is less than 30%, wherein the metal impurity element includes any one of nickel, chromium, and lead. It can be understood that the metal impurity elements contained in different alloys are different, and the metal impurity elements can be separated out in the use process of the heating element, so that atomized liquid can change color, the single-phase mass ratio of the metal impurity elements on the surface of the heating element is less than 30%, and the separation of the metal impurity elements can be reduced, so that the use safety of the heating element is improved.
In some embodiments, the thickness of the composite heat-generating body 10 is 0.06mm to 0.2mm. Specifically, the thickness of the composite heating element body 10 may be 0.06mm, 0.1mm, 0.2mm, 0.15mm, 0.18mm, 0.2mm, etc., it is understood that the thickness of the heating element is the thickness of the composite heating element body 10, and the thickness of the composite heating element body 10 is greater than 0.2mm, which results in too slow heating rate and high energy consumption of the heating element; the thickness of the composite heat-generating body 10 is less than 0.06mm, resulting in insufficient strength of the heat-generating body.
In some embodiments, the resistivity of the heating element is 0.79 μΩ·m to 1.49 μΩ·m, specifically, the resistivity of the heating element may be 0.79 μΩ·m, 0.85 μΩ·m, 0.90 μΩ·m, 1.00 μΩ·m, 1.15 μΩ·m, 1.22 μΩ·m, 1.35 μΩ·m, 1.49 μΩ·m, or the like, but other values within the above range are certainly possible, and the invention is not limited thereto. In the above range, it is shown that the heating element of the present application has excellent resistivity, can reduce the volume of the heating element and can generate higher heat, thereby improving the heating efficiency of the heating element.
In some embodiments, the temperature coefficient of resistance of the heating element is 77 ppm/DEG C to 100 ppm/DEG C, specifically, the temperature coefficient of resistance of the heating element may be 77 ppm/DEG C, 85 ppm/DEG C, 92 ppm/DEG C, 100 ppm/DEG C, 300 ppm/DEG C, 550 ppm/DEG C, 750 ppm/DEG C, 900 ppm/DEG C, 1050 ppm/DEG C, 100 ppm/DEG C, etc., but other values within the above range are also possible, without limitation. The temperature coefficient of resistance of the heating element is within the above range, and the stability of the heating power of the heating element can be ensured.
In some embodiments, the difference in coefficient of thermal expansion between the first heat-generating layer 1 and the second heat-generating layer 2 is less than 4×10 -6 Specifically, the difference in thermal expansion coefficient between the first heat generating layer 1 and the second heat generating layer 2 may be 5×10 -7 、8×10 -7 、1×10 -6 、4×10 -6 And 3X 10 -6 And the like in the above range, the expansion deformation of the first heating layer 1 and the second heating layer 2 in the heating process after the power is turned on is similar, the compatibility of the first heating layer 1 and the second heating layer 2 can be improved, the mechanical strength of the heating body can be improved, and the heating body can be repeatedly and circularly heated, so that the problems of layering and cracking can be avoided. The heating body of this application need not to add extra auxiliary layer, can reduce manufacturing cost.
For the same reason, the difference in thermal expansion coefficient between the second heat generating layer 2 and the third heat generating layer 3 is less than 4×10 -6 The method comprises the steps of carrying out a first treatment on the surface of the The difference of the thermal expansion coefficients of the first heating layer 1 and the third heating layer 3 is less than 4 multiplied by 10 -6 。
In some embodiments, the elongation at break of at least one of the first heat generating layer 1 and the second heat generating layer 2 is greater than 10%, specifically, the elongation at break of at least one of the first heat generating layer 1 and the second heat generating layer 2 may be 12%, 15%, 18%, 20%, 25%, 30%, 40%, etc., but may be other values within the above range, as well, without limitation. In the range, the heating element material has certain shaping deformability, and can avoid fracture or crack generation in the heating process of the heating element. The elongation at break of the first heat-generating layer 1 and the second heat-generating layer 2 is preferably more than 10%.
In some embodiments, when the heating body is a three-layer structure in which the first heating layer 1, the second heating layer 2, and the third heating layer 3 are sequentially laminated, the elongation at break of the first heating layer 1 and/or the third heating layer 3 is greater than 10%. In other embodiments, when the heating element has a three-layer structure in which the third heating layer 3, the first heating layer 1, and the second heating layer 2 are laminated in this order, the elongation at break of the second heating layer 2 and/or the third heating layer 3 is greater than 10%.
In some embodiments, the heating element is provided with a set pattern and a patterned heating element, on one hand, the contact area between the heating element and the aerosol generating substrate can be increased, and the uniform heat dissipation of the whole heating element is realized; on the other hand, the overall resistance of the heating element can be improved. The heating element is exemplified by a mesh-shaped heating element, but the heating element may be prepared in other shapes. Namely, when the heating body comprises the first heating layer 1 and the second heating layer 2, the heating body can be hollow in a local area, and other areas are of a double-layer structure formed by laminating the first heating layer 1 and the second heating layer 2. As shown in fig. 4, a schematic structural diagram of a two-layer composite patterned heating element is shown in fig. 5, and as the schematic structural diagram of a three-layer composite patterned heating element is shown, the atomization area can be increased and the mist quantity can be improved by adopting the patterned heating element.
In some embodiments, the projected area of the first heat generating layer 1 on the second heat generating layer 2 is equal to or less than the area of the surface of the second heat generating layer 2 in contact with the first heat generating layer 1 or the projected area of the second heat generating layer 2 on the first heat generating layer 1 is equal to or less than the area of the surface of the first heat generating layer 1 in contact with the second heat generating layer 2. As shown in fig. 6, the non-hollowed-out area of the heating element in the present application may be a double-layer structure in which only the first heating layer 1 is used as a local area and the first heating layer 1 and the second heating layer 2 are stacked in other areas; or the heating body can be a double-layer structure in which a local area is only the second heating layer 2 and other areas are formed by laminating the first heating layer 1 and the second heating layer 2. Above-mentioned setting, when can guaranteeing the heat-generating body atomizing area on the one hand, reduce the quality and the cost of heat-generating body, be applicable to user's diversified demand. It should be understood that the local area should be only 50% of the area of the first heat generating layer 1 that is in contact with the first heat generating layer 1 on the second heat generating layer 2, or the local area should be only 50% of the area of the second heat generating layer 2 that is in contact with the second heat generating layer 2 on the first heat generating layer 1.
For the same reason, when the heating element is a composite layer formed by three layers, the first heating layer 1 and the third heating layer 3 can be patterned according to the user requirement, that is, the heating element can be in a hollow structure in a local area, and other areas are three-layer structures of the first heating layer 1, the second heating layer 2 and the third heating layer 3, or the arrangement of the first heating layer 1 and/or the third heating layer 3 is adaptively reduced in other areas, the heating element structure of the first heating layer 1 is shown in fig. 7, and the heating element structures of the first heating layer 1 and the third heating layer 3 are reduced as shown in fig. 8, so as to improve the heating efficiency.
The application provides a preparation method of the heating element, which comprises the following steps:
and stacking the first heating layer 1 and the second heating layer 2, and then rolling and compositing to obtain a composite heating body 10, thereby obtaining the heating body. The resistivity of the first heating layer 1 is smaller than that of the second heating layer 2, and the materials of the first heating layer 1 and the second heating layer 2 are both metals.
In the above scheme, the composite heating body 10 is of an integral structure, the composite heating body 10 comprises the first heating layer 1 and the second heating layer 2 which are arranged in a laminated manner, and gradient heat distribution is formed by adopting the laminated arrangement of the heating layers with two different resistivities, so that the heating performance of the heating body can be enhanced, the heating body has proper resistivity and resistance temperature coefficient in use, the heating body can not only be fully and quickly enabled to form aerosol, the heat utilization efficiency is improved, the taste burst is improved, the taste of the aerosol is effectively improved, and the user experience is enhanced; the heating body of this application can also realize the control by temperature change and prevent dry combustion method function, and the size adaptation for the heating body has characteristics of light-weighted, small. The preparation method is simple in process, the heating element is used for heating the aerosol generating substrate, the comprehensive performance of the heating element can be improved, the taste of the aerosol is effectively improved, and the user experience is enhanced.
In some embodiments, the method of manufacturing a heating element further comprises: the first heat generating layer 1 and the second heat generating layer 2 which have been compounded are subjected to patterning treatment.
In some embodiments, the patterning process includes at least one of etching and stamping, wherein stamping may be laser etching or chemical etching, and the patterning process is performed by conventional methods in the art, which are not limited herein. After patterning, a grid-shaped heating body is obtained, and the heating body can be prepared into other shapes.
In some embodiments, during the patterning process, only the first heat generating layer 1 or the second heat generating layer 2 may be etched or stamped in some regions, such that some regions of the heat generating body only exist in the first heat generating layer 1 or only exist in the second heat generating layer 2; of course, the first heating layer 1 and the second heating layer 2 in some areas can be etched or stamped at the same time, so that the areas are in a hollowed-out state.
In some embodiments, the ratio of the thickness of the first heat-generating layer 1 to the composite heat-generating body 10 is (0.1 to 0.9): 1, specifically, the ratio of the thickness of the first heat-generating layer 1 to the composite heat-generating body 10 may be 0.1: 1. 0.2: 1. 0.3: 1. 0.4: 1. 0.5: 1. 0.6: 1. 0.7: 1. 0.8:1 and 0.9:1, etc. of course, may be other values within the above range, and the present application may control the ratio of the thicknesses of the first heating layer 1 and the composite heating body 10, that is, the ratio of the thicknesses of the first heating layer 1 and the second heating layer 2, so as to adjust the resistivity and the temperature coefficient of resistance of the heating body, thereby meeting the diversified demands of users.
In some embodiments, the material of the first heat generating layer 1 includes at least one of stainless steel and TA-type titanium alloy. The first stainless steel includes at least one of stainless steel 304, stainless steel 316L, and stainless steel 317L. The TA-type titanium alloy includes at least one of titanium alloy TA1, titanium alloy TA2, and titanium alloy TA 3.
In some embodiments, the material of the second heat generating layer 2 includes at least one of stainless steel, iron-chromium-aluminum alloy, nickel-chromium-iron alloy, and TC-type titanium alloy. Exemplary second stainless steels include stainless steel 904, stainless steel 254smo, and stainless steel N08926, among others. The ferrochrome includes 0Cr25Al5, 0Cr27Al7Mo2, etc., the nichrome includes Cr20Ni80, cr15Ni60, cr20Ni35, etc., and the TC-type titanium alloy includes TC4, TC7, TC10, etc.
In some embodiments, when the material of the second heating layer 2 includes at least one of an iron-chromium-aluminum alloy and a nickel-chromium-iron alloy, the composite heating body 10 further includes a third heating layer 3 laminated on the surface of the second heating layer 2, that is, the first heating layer 1, the second heating layer 2 and the third heating layer 3 are laminated and then rolled, and then subjected to patterning treatment, so as to obtain a sandwich-type laminated heating body structure.
In some embodiments, when the material of the second heating layer 2 includes at least one of the second stainless steel and the TC-type titanium alloy, the composite heating body 10 further includes the third heating layer 3 disposed on the surface of the first heating layer 1, that is, the third heating layer 3, the first heating layer 1 and the second heating layer 2 are laminated and then rolled, and then subjected to patterning treatment, so as to obtain a sandwich-type laminated heating body structure.
In some embodiments, when the heating element of the present application is in a sandwich-type laminated structure, the area subjected to patterning may be etched or stamped on the first heating layer 1, the second heating layer 2 and the third heating layer 3 at the same time, and after the first heating layer 1, the second heating layer 2 and the third heating layer 3 are etched or stamped, the local area of the first heating layer 1 or the third heating layer 3 is etched or stamped so that the thickness of the local area of the heating element is smaller than the total thickness of the first heating layer 1, the second heating layer 2 and the third heating layer 3.
In some embodiments, the material of the third heat generating layer 3 includes at least one of a second stainless steel and a TA-type titanium alloy. It is understood that the materials of the first heat generating layer 1 and the third heat generating layer 3 may be the same or different. The present application is not limited herein, and it is understood that the first heat generating layer 1 and the third heat generating layer 3 having similar or complementary performances may be selected according to the needs of the user.
The application still provides the aerosol generating device who contains above-mentioned heat-generating body, including the casing, the casing has and holds the chamber, holds the chamber and is used for acceping aerosol and produce matrix and heat-generating body, and the heat-generating body soaks in aerosol production matrix, is connected with the power through the electric welding on the heat-generating body, thereby this application is through the heat-generating body winding can also directly electrically conduct under the plane state and generate heat for the conductive heat of tube-shape self to realize heating aerosol formation matrix, guarantee heating temperature distribution's homogeneity and produce the high efficiency of aerosol.
The technical scheme of the present application is described in detail below according to specific embodiments.
Example 1
(1) A first heat generating layer 1 and a second heat generating layer 2 were provided, wherein the first heat generating layer 1 was 316L stainless steel (resistivity 0.74. Mu. Ω. M), the second heat generating layer 2 was 904L stainless steel (resistivity 1.00. Mu. Ω. M), and the first heat generating layer 1 and the second heat generating layer 2 were laminated and then roll-compounded to obtain a precursor.
(2) And carrying out chemical etching treatment on the precursor to obtain the grid-shaped heating body.
In this embodiment, the thickness of the heat-generating body was 0.07mm, and the ratio of the thickness of the first heat-generating layer 1 to the thickness of the heat-generating body was 20%.
Example 2
(1) A first heat generating layer 1 and a second heat generating layer 2 are provided, wherein the first heat generating layer 1 is TA1 titanium alloy (resistivity 0.46 mu ohm-m), the second heat generating layer 2 is TC4 titanium alloy (resistivity 1.60 mu ohm-m), and the first heat generating layer 1 and the second heat generating layer 2 are laminated and then subjected to rolling and compounding to obtain a precursor.
(2) And stamping the precursor to obtain the grid-shaped heating body.
In this embodiment, the thickness of the heat-generating body was 0.05mm, and the ratio of the thickness of the first heat-generating layer 1 to the thickness of the heat-generating body was 50%.
Example 3
Unlike example 1, the thickness of the first heat-generating layer 1 was 10% in the heat-generating body thickness.
Example 4
Unlike example 1, the thickness of the first heat-generating layer 1 was 50% in the heat-generating body thickness.
Example 5
Unlike example 1, the thickness of the first heat-generating layer 1 was 90% in the heat-generating body thickness.
Example 6
(1) Providing a first heating layer 1, a second heating layer 2 and a third heating layer 3, wherein the first heating layer 1 and the third heating layer 3 are made of 316L stainless steel (resistivity is 0.74 mu omega-m), the second heating layer 2 is made of ferrochrome aluminum alloy 0Cr25Al5 (resistivity is 1.1 mu omega-m), and the first heating layer 1, the second heating layer 2 and the third heating layer 3 are laminated in sequence and then are rolled and compounded to obtain a precursor.
(2) And carrying out chemical etching treatment on the precursor to obtain the grid-shaped heating body.
In this embodiment, the thickness of the heat-generating body was 0.08mm, and the total thickness of the first heat-generating layer 1 and the third heat-generating layer 3 was 50% in the heat-generating body thickness.
Example 7
Unlike example 1, the thickness of the first heat-generating layer 1 was 8% in the heat-generating body thickness.
Example 8
Unlike example 1, the thickness of the first heat-generating layer 1 was 93% in the heat-generating body thickness.
Example 9
Unlike example 6, the second heat-generating layer 2 was an iron-chromium-nickel alloy Ni80Cr20 (resistivity 1.09 μΩ·m), and the total thickness of the first heat-generating layer 1 and the third heat-generating layer 3 was 50% in the heat-generating body thickness.
Comparative example 1
The heating element is of a single-layer structure, and the heating element is made of 316L stainless steel.
Comparative example 2
The heating element is of a single-layer structure, and the heating element is made of iron-chromium-aluminum alloy 0Cr25Al5.
Performance testing
(1) The thickness of the heating element and the thickness of the protective layers (i.e., the first heating layer 1 and the third heating layer 3) were measured using a microscope.
(2) And testing the nickel element content on the surface of the heating element by adopting a scanning electron microscope EDS energy spectrum method.
(3) And testing the resistivity of the heating element by adopting a resistivity tester.
(4) The resistance of the heating element at a certain temperature difference is measured to calculate the temperature coefficient of resistance, wherein the temperature coefficient of resistance tcr= (R 2 -R 1 )/R1(T 2 -T 1 ) Wherein R is 1 Corresponding temperature T 1 Measuring resistance value of the heating element, R 2 Corresponding temperature T 2 The resistance value of the heating element was measured.
The test data are shown in table 1:
TABLE 1 Performance parameters of the heating elements prepared in examples and comparative examples
The heating bodies prepared in the embodiments 1 to 6 and the embodiment 9 are arranged in a layer-by-layer manner by adopting two or three heating layers, so that the heating performance can be enhanced, the heating body has excellent resistivity and higher resistance temperature coefficient, the structure size of the heating body is proper, the heat generated by the heating body in the heating process can be more due to the excellent resistivity, and the heating efficiency is improved; the higher temperature coefficient of resistance enables the temperature of the heating element to be controllable, and can prevent the heating element from dry burning in the use process. In addition, the heating body is used for heating the aerosol generating substrate, so that burst can be improved, the taste of the aerosol is effectively improved, and the user experience is enhanced.
In the embodiment 1, the first heating layer is made of 316L stainless steel, 316L has low resistivity of 0.74 mu Ω & m and higher TCR (temperature coefficient of resistance) 900 ppm/DEG C, the second heating layer 2 is made of 904L stainless steel, 904L stainless steel has higher resistivity of 1.00 mu Ω & m and lower TCR (temperature coefficient of resistance) 450 ppm/DEG C, and the heating elements obtained by rolling the first heating layer 1 and the second heating layer 2 can obtain higher TCR (temperature coefficient of resistance) and proper resistivity, can realize accurate temperature control while ensuring the heating efficiency of the heating elements, and prevent dry heating.
In example 2, the material of the first heat-generating layer 1 was TA1 titanium alloy, the TA1 titanium alloy had low resistivity of 0.46 μΩ·m and very high TCR (temperature coefficient of resistance) 3700ppm/°c, the material of the second heat-generating layer 2 was TC4 titanium alloy, the TC4 titanium alloy had high resistivity of 1.60 μΩ·m and low TCR (temperature coefficient of resistance) of 350ppm/°c, and the heat-generating bodies obtained by rolling the first heat-generating layer 1 and the second heat-generating layer 2 could obtain high resistivity and high TCR, and could achieve the function of temperature control while improving heat-generating efficiency, and the combination property was excellent.
In the embodiment 6, the first heating layer 1 and the third heating layer of the heating body are made of 316L stainless steel, and the 316L stainless steel is used as a food-grade metal material, so that the heating body has high safety performance in the aspect of ion precipitation of iron, nickel, chromium and the like; the second heating layer 2 is made of 0Cr25Al5 alloy with high resistivity, and the heating body is obtained by rolling the protective layer and the heating layer, so that the heating body can obtain excellent resistivity, the surface of the heating body is corrosion-resistant and oxidation-resistant, and no large amount of nickel ions are separated out, so that the use safety of the heating body can be improved. And the inventor has found experimentally that: when the heating element is observed after being soaked in any fruit-flavored tobacco tar for one week, compared with a blank tobacco tar control group without the heating element, the color of the tobacco tar of the heating element has no chromatic aberration, which shows that the structural design of the heating element of the embodiment can effectively prevent iron ions from precipitating in the tobacco tar.
In example 7, the thickness of the first heat generating layer 1 was smaller than the range defined in the present application, resulting in difficult formation due to rolling failure and easy control of the process.
In example 8, the thickness of the first heat generating layer 1 is greater than the limit of the application, and the rolling failure is difficult to be formed, and the process is difficult to be controlled.
In summary, according to the present application, the material of the heating layer is selected, so that the heating element with excellent performance can be obtained by designing and customizing the heating layer according to the needs of the user.
In comparative example 1, a heating element made of a conventional single-layer stainless steel material was used, and 316L stainless steel was used as a food-grade metal material, which had high safety performance in terms of ion precipitation of iron, nickel, chromium, etc., but the resistivity thereof was low, so that the heating efficiency of the heating element was low.
In comparative example 2, a conventional single-layer iron-chromium-aluminum alloy heating element is adopted, the surface iron element content is high, nickel ions are easy to separate out in the use process, and the use safety of the heating element is reduced.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (12)
1. A heating element provided in an aerosol-generating device for heating an aerosol-forming substrate and volatilizing at least one component of the aerosol-forming substrate to form an aerosol for inhalation by a user, the heating element comprising:
the composite heating body comprises a first heating layer and a second heating layer which are arranged in a laminated mode, wherein the resistivity of the first heating layer is smaller than that of the second heating layer, and the first heating layer and the second heating layer are made of metal.
2. A heat-generating body as recited in claim 1, wherein the heat-generating body includes at least one of the following features a to i:
a. the material of the first heating layer comprises at least one of first stainless steel and TA type titanium alloy;
b. the material of the first heating layer comprises at least one of first stainless steel and TA-type titanium alloy, and the first stainless steel comprises at least one of stainless steel 304, stainless steel 316L and stainless steel 317L;
c. the material of the first heating layer comprises at least one of first stainless steel and TA-type titanium alloy, and the TA-type titanium alloy comprises at least one of titanium alloy TA1, titanium alloy TA2 and titanium alloy TA 3;
d. The ratio of the thickness of the first heating layer to the thickness of the composite heating body is (0.1-0.9): 1, a step of;
e. the material of the second heating layer comprises at least one of second stainless steel, iron-chromium-aluminum alloy, nickel-chromium-iron alloy and TC-type titanium alloy;
f. the material of the second heating layer comprises at least one of second stainless steel, iron-chromium-aluminum alloy, nickel-chromium-iron alloy and TC-type titanium alloy, and the second stainless steel comprises at least one of stainless steel 904, stainless steel 254smo and stainless steel N08926;
g. the material of the second heating layer comprises at least one of second stainless steel, ferrochrome aluminum alloy, nickel-chromium-iron alloy and TC-type titanium alloy, and the ferrochrome aluminum alloy comprises at least one of 0Cr25Al5 and 0Cr27Al7Mo 2;
h. the material of the second heating layer comprises at least one of second stainless steel, ferrochrome aluminum alloy, nickel-chromium-iron alloy and TC-type titanium alloy, and the nickel-chromium-iron alloy comprises at least one of Cr20Ni80, cr15Ni60 and Cr20Ni 35;
i. the material of the second heating layer comprises at least one of second stainless steel, ferrochrome aluminum alloy, nickel-chrome-iron alloy and TC-type titanium alloy, and the TC-type titanium alloy comprises at least one of titanium alloy TC4, titanium alloy TC7 and titanium alloy TC 10.
3. A heat-generating body according to claim 1, wherein the material of the second heat-generating layer comprises at least one of an iron-chromium-aluminum alloy and a nickel-chromium-iron alloy, and the composite heat-generating body further comprises a third heat-generating layer provided on the surface of the second heat-generating layer in a laminated manner, and the third heat-generating layer has a resistivity smaller than or larger than that of the second heat-generating layer.
4. A heat-generating body as described in claim 3, wherein the heat-generating body includes at least one of the following features a to e:
a. the ratio of the total thickness of the first heating layer and the third heating layer to the thickness of the composite heating body is (0.1-0.9): 1, a step of;
b. the material of the third heating layer comprises at least one of first stainless steel and TA-type titanium alloy;
c. the third heating layer is made of at least one of first stainless steel and TA-type titanium alloy, and the first stainless steel comprises at least one of stainless steel 304, stainless steel 316L and stainless steel 317L;
d. the material of the third heating layer comprises at least one of first stainless steel and TA-type titanium alloy, and the TA-type titanium alloy comprises at least one of titanium alloy TA1, titanium alloy TA2 and titanium alloy TA 3;
e. The single mass ratio of the metal impurity element on the surface of the heating element is less than 30%, and the metal impurity element comprises any one of nickel, chromium and lead.
5. The heat-generating body according to claim 1, wherein the material of the second heat-generating layer includes at least one of a second stainless steel and a TC-type titanium alloy, and the composite heat-generating body further includes a third heat-generating layer provided on the surface of the first heat-generating layer in a laminated manner, and the third heat-generating layer has a resistivity smaller than or larger than that of the first heat-generating layer.
6. A heat-generating body as described in claim 5, characterized in that the heat-generating body includes at least one of the following features a to d:
a. the ratio of the total thickness of the second heating layer and the third heating layer to the thickness of the composite heating body is (0.1-0.9): 1, a step of;
b. the material of the third heating layer comprises at least one of first stainless steel and TA-type titanium alloy;
c. the third heating layer is made of at least one of first stainless steel and TA-type titanium alloy, and the first stainless steel comprises at least one of stainless steel 304, stainless steel 316L and stainless steel 317L;
d. the material of the third heating layer comprises at least one of first stainless steel and TA-type titanium alloy, and the TA-type titanium alloy comprises at least one of titanium alloy TA1, titanium alloy TA2 and titanium alloy TA 3.
7. A heat-generating body as recited in claim 1, wherein the heat-generating body includes at least one of the following features a to e:
a. the thickness of the composite heating body is 0.06 mm-0.2 mm;
b. the resistivity of the heating element is 0.79 mu omega m-1.49 mu omega m;
c. the resistance temperature coefficient of the heating element is 77 ppm/DEG C-100 ppm/DEG C;
d. the difference of thermal expansion coefficients of the first heating layer and the second heating layer is less than 4 multiplied by 10 -6 ；
e. At least one of the first heating layer and the second heating layer has an elongation at break of greater than 10%.
8. The heat-generating body according to any one of claims 1 to 7, characterized in that the heat-generating body has a set pattern.
9. The heat-generating body according to claim 8, wherein a projected area of the first heat-generating layer on the second heat-generating layer is equal to or smaller than an area of a surface of the second heat-generating layer in contact with the first heat-generating layer; or the projection area of the second heating layer on the first heating layer is smaller than or equal to the area of the surface of the first heating layer, which is contacted with the second heating layer.
10. The preparation method of the heating body is characterized by comprising the following steps:
Rolling and compounding the first heating layer and the second heating layer after stacking, wherein the resistivity of the first heating layer is smaller than that of the second heating layer, and the materials of the first heating layer and the second heating layer are metal;
and patterning the first heating layer and the second heating layer which are compounded to obtain a composite heating body, and thus obtaining the heating body.
11. The method of claim 10, further comprising laminating a third heat generating layer on the surface of the second heat generating layer before the rolling compounding of the first heat generating layer and the second heat generating layer, wherein the third heat generating layer has a resistivity smaller than or greater than the second heat generating layer; or (b)
And before rolling and compounding the first heating layer and the second heating layer, stacking a third heating layer on the surface of the first heating layer, wherein the resistivity of the third heating layer is smaller than or larger than that of the first heating layer.
12. An aerosol-generating device, comprising:
a housing having a receiving cavity for receiving an aerosol-generating substrate;
a heating element provided in the accommodating chamber for heating the aerosol-generating substrate, wherein the heating element is the heating element according to any one of claims 1 to 9.
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| CN202211216229.XA CN117837819A (en) | 2022-09-30 | 2022-09-30 | Heating element, preparation method thereof and aerosol generating device |
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| CN202211216229.XA CN117837819A (en) | 2022-09-30 | 2022-09-30 | Heating element, preparation method thereof and aerosol generating device |
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