CN109875123B - Electronic cigarette atomizer, electronic cigarette, atomization assembly and preparation method of atomization assembly - Google Patents
Electronic cigarette atomizer, electronic cigarette, atomization assembly and preparation method of atomization assembly Download PDFInfo
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Abstract
The invention provides an electronic cigarette atomizer which comprises an oil storage cavity and an atomizing assembly, wherein the oil storage cavity is communicated with the atomizing assembly; the atomization assembly comprises a porous body and a porous transition layer which are arranged in a stacked mode; the porous transition layer is provided with a first surface opposite to the porous body, and the heating element is arranged on at least one part of the first surface; the porous body includes a first material, the heat-generating element includes a second material, and the porous transition layer includes the first material and the second material. According to the atomization assembly adopted by the atomizer, the porous body and the heating element are connected through the transitional porous transition layer, so that the interface difference between two different materials when the porous body and the heating element are directly combined can be eliminated, and the combination stability is improved; on the other hand, the property of the transition layer is slowly changed along with the change of the material composition and the structure, so that the consistency of the resistance values of all areas of the sintered heating element can be ensured.
Description
Technical Field
The embodiment of the invention relates to the field, in particular to an electronic cigarette atomizer, an electronic cigarette, an atomization component and a preparation method of the atomization component.
Background
The electronic cigarette product is characterized in that a core component of the electronic cigarette product is an atomizer which evaporates electronic cigarette oil to generate cigarette oil aerosol, and the function of the atomizer is mainly realized based on an atomization component; the atomization component is provided with a porous body for absorbing and conducting the tobacco tar and a heating element which is arranged on the porous body and used for heating and atomizing the tobacco tar absorbed and conducted by the porous body. Wherein, the porous body is a part with capillary micropores inside, and can perform tobacco tar infiltration absorption and conduction through the micropores inside; the heating element is provided with a heating part for heating and a conductive pin part, and the heating part is used for heating and evaporating the tobacco tar conducted by the porous body to form tobacco tar aerosol for smoking.
At present, a porous ceramic thick film heating body is generally adopted as an atomization component, a porous ceramic body with smoke oil absorption and conduction micron-sized micropores is used as a carrier, and a heating circuit is printed through a screen printing process and then sintered to form a heating element. The porous ceramic body is usually prepared by mixing a ceramic material and a pore-forming agent and then sintering, and a large number of micropores are formed in the sintered ceramic body so as to be used for absorbing and conducting the tobacco tar; the whole preparation process can realize automatic production and has higher process stability.
In the preparation of the atomization assembly, the ceramic body has micropores, so that the surface of the porous ceramic body is relatively rough, the adhesion force of a heating element prepared by printing a heating circuit on the surface of the porous ceramic body and subsequent sintering is poor, uneven high and low convexes and the heating element permeating into the micropores exist, the resistance stability and uniformity of the heating element are insufficient, and the problems of unstable resistance floating and even incapability of conducting due to fracture can occur in use; meanwhile, after the continuous operation, the heating element is easy to peel off due to the thermal cycle impact effect.
Disclosure of Invention
In order to solve the problem that the resistance consistency and the associativity generated by printing heating lines on an electronic cigarette porous ceramic body in the prior art are insufficient, the embodiment of the invention provides an electronic cigarette atomizer with high stability in resistance and associativity.
Based on the purposes, the electronic cigarette atomizer provided by the invention comprises an oil storage cavity for storing tobacco tar and an atomizing assembly for sucking the tobacco tar from the oil storage cavity and heating and atomizing the tobacco tar; the atomization assembly comprises a porous body and a porous transition layer which are arranged in a stacked mode; the porous transition layer has a first surface opposite the porous body, and the heat-generating element is disposed on at least a portion of the first surface;
the porous body includes a first material, the heat generating element includes a second material, and the porous transition layer includes the first material and the second material.
Preferably, the porous body is made of a ceramic material, and the heating element is made of a metal material; the porous transition layer is prepared from a metal ceramic composite material.
Preferably, the porous transition layer is made of the same composite material as the porous body in terms of ceramic composition, and the porous transition layer is made of the same composite material as the heat generating element in terms of metal composition.
Preferably, the content of the metal component in the porous transition layer gradually increases in a direction of the porous body toward the heat generating element.
Preferably, the porous transition layer includes a plurality of cermet composite material layers laminated on each other along the porous body in a direction toward the heat generating element; and the content of the metal component in the plurality of composite material layers is gradually increased along the porous body toward the heating element.
Preferably, the mass percentages of the metal-containing components in two adjacent composite layers differ by no more than 40%.
Preferably, the thickness of the porous transition layer is 0.08 to 1mm.
Preferably, the efficiency of soot conduction in the porous transition layer is higher than that of the porous body.
Preferably, the heat-generating element does not completely cover the first surface to form a plurality of escape sites for releasing aerosol generated by tobacco smoke atomization.
The invention further provides a preparation method of the atomization assembly, which is characterized by comprising the following steps:
mixing first material powder for forming the porous body and second material powder for forming the porous transition layer with a pore-forming agent respectively to prepare first casting slurry and second casting slurry, and forming a plurality of first casting films and a plurality of second casting films by a casting process respectively; preparing third casting slurry from third material powder for the heating element, and preparing a plurality of third casting membranes by a casting process;
sequentially laminating the first casting membrane, the second casting membrane and the third casting membrane in sequence and then pressing to obtain a green body;
sintering the green blank at the temperature of 700-1200 ℃ to obtain an atomization assembly precursor, wherein the atomization assembly precursor comprises a metal layer formed by sintering a third casting membrane;
and processing the metal layer to form the heating element.
Preferably, the first casting film, the second casting film and the third casting film are sequentially laminated and then subjected to a pressing step, wherein the pressing process is performed by using a warm isostatic pressing method.
The invention further provides an atomization assembly directly prepared by the preparation method of the atomization assembly.
The invention further provides an electronic cigarette based on the atomizer, wherein the electronic cigarette comprises an atomizing device for absorbing tobacco tar and atomizing the tobacco tar and a power supply device for supplying power to the atomizing device; wherein the atomizing means is carried out using the electronic cigarette atomizer described above.
The atomization assembly adopted by the atomizer provided by the invention enables the heating element to be connected with the porous body through the porous transition layer, the combination tightness is stronger, the stability and uniformity of the resistance value of the resistor are higher guaranteed, and the deformation amount and the falling rate of the heating element in preparation and use are lower. Particularly, the porous transition layers are connected through the transitional porous transition layers, so that the interface difference between two different materials when the porous body and the heating element are directly combined can be eliminated, and the combination stability is improved; on the other hand, the property of the transition layer is slowly changed along with the change of the material composition and the structure, so that the consistency of the resistance values of all areas of the sintered heating element can be ensured.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a schematic diagram of an embodiment of an atomizing assembly;
FIG. 2 is a graphical representation of ceramic and metal content of a porous transition layer in one embodiment;
FIG. 3 is a schematic structural diagram of a porous transition layer according to yet another embodiment;
FIG. 4 is a schematic diagram of a lamination and pressing step in a process for making an atomization assembly according to one embodiment;
FIG. 5 is a schematic diagram of the structure of an embodiment of an atomizing assembly precursor prepared;
FIG. 6 is a microscopic electron micrograph of an atomized assembly precursor prepared according to one embodiment;
fig. 7 is a schematic structural diagram of an electronic smoke atomizer provided by an embodiment.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and detailed description.
The invention provides an atomization assembly for a tobacco tar type electronic cigarette, which takes a multilayer structure shown in the embodiment of fig. 1 as an example in one embodiment, and the atomization assembly for the electronic cigarette comprises a porous body 10, a porous transition layer 20 and a heating element 30 which are sequentially stacked. The porous body 10 and the heating element 30 are connected by a porous transition layer 20. Wherein,
the porous body 10 has micro-porous pores therein for smoke absorption and conduction; meanwhile, the porous transition layer 20 is also of a porous structure, and the microporous pores in the porous transition layer can provide a channel for the conduction of the tobacco tar and the escape of aerosol, so that the conduction and atomization of the tobacco tar are not influenced. The heating element 30 generates heat after being electrified, and heats and atomizes the tobacco tar which is conducted to the porous transition layer 20. Based on the above-mentioned problem of insufficient interfacial bonding capability between the porous body 10 and the heating element 30, the interfacial bonding strength between the porous transition layer 20 and the porous body 10 and between the porous transition layer 20 and the heating element 30 after the preparation are both greater than the interfacial bonding strength between the porous body 10 and the heating element 30 after the direct printing and sintering. The interface bonding strength can be improved by using a material having suitable material composition similarity and bonding property. The heating element 30 is connected with the porous body 10 through the porous transition layer 20, the combination tightness is stronger, the stability and uniformity of the resistance value of the resistor are ensured, and the deformation and falling rate of the heating element 30 are lower in preparation and use.
Although the porous transition layer 20 also contains a metal component, the porous transition layer 20 does not cause problems such as short-circuiting and resistance jump of the heating element 30 in the final design and production. Because when the content of the metal in the porous transition layer 20 is low, the metal inside the porous transition layer 20 itself is blocked by a large amount of ceramic space, which cannot form an effective current loop, and is equivalent to an insulator; if the metal content in the porous transition layer 20 is high, a part of the metal component will be sintered with the heating element 30 to form a uniform resistor, and the resistor is processed by planar grinding, laser etching, or etching to form a predetermined resistance value in step S60 of the following manufacturing method.
In terms of material selection, the porous body 10 is generally made of porous ceramics, inorganic porous materials, and porous rigid materials, and the porous ceramics most commonly used in the electronic aerosol atomizer are at least one of silicon-based ceramics such as silica, silicon carbide, and silicon nitride, aluminum-based ceramics such as aluminum nitride and aluminum oxide, and zirconia ceramics, diatomaceous earth ceramics, and the like; the pore diameter of the porous body 10 is preferably 5 to 60 μm, and the porosity is 30 to 60%. The heating element 30 is based on the functional requirement of heating and atomizing the tobacco tar, and is usually made of a metal material or a metal alloy material with appropriate impedance; for example, suitable metal or alloy materials include at least one of nickel, cobalt, zirconium, titanium, nickel alloys, cobalt alloys, zirconium alloys, titanium alloys, nickel-chromium alloys, nickel-iron alloys, iron-chromium alloys, titanium alloys, iron-manganese-aluminum alloys, or stainless steel, among others.
The porous transition layer 20 in the embodiment of the present invention also has a porous structure, so that it can completely cover the surface of the porous body 10in the structure, and at least a part of the surface of the porous body 10 does not need to be exposed for the aerosol to escape, thereby being more convenient for preparation. At the same time, the heating element 30 does not completely cover the opposite surface of the porous transition layer 20 to form a plurality of escape sites for releasing the aerosol generated by the atomization of the tobacco tar. Regarding the parameters of the pore diameter and porosity of the pores of the porous transition layer 20, in a preferred embodiment, the pore diameter and porosity of the pores of the porous transition layer 20 can be higher than those of the porous body, so as to ensure that the smoke oil conduction efficiency of the porous transition layer 20 is higher than that of the porous body 10, which is advantageous in that the dry burning of the heating element 30 can be effectively eliminated and relieved. Because the tobacco tar is atomized into aerosol and escapes mainly at the porous transition layer 20 which is in contact with or close to the heating element 30, if the tobacco tar cannot be rapidly replenished after being atomized and consumed, the heating element 30 can generate dry burning; the tobacco tar conduction efficiency of the porous transition layer 20 is made faster, so that the tobacco tar can be effectively supplemented from the porous body 10, and the dry burning can be eliminated and relieved.
Based on the above requirement that the porous transition layer 20 needs to have suitable material composition similarity and bonding property with the porous body 10 and the heating element 30 to improve the interface bonding strength, the porous transition layer 20 is made of a metal ceramic composite material according to the materials of the porous body 10 and the heating element 30. The transitional composite material composed of two-phase materials ensures that the porous ceramic body and the metal heating element have a slow transition on the integral size gradient, can well eliminate the interface difference between two different materials, and prevents the problem of interface cracking in the heating-cooling circulation process; on the other hand, the property of the transition layer is changed slowly with the change of the material composition and structure, so that the consistency of the resistance values of all the areas of the sintered heating element 30 can be ensured, and the uniformity of the heating temperature can be improved.
In a further preferred embodiment, the porous transition layer 20 itself also has a transition in material composition. Referring specifically to fig. 2, the content of the metal component in the porous transition layer 20 gradually increases along the direction from the porous body 10 to the heating element 30, i.e., the direction of arrow P in fig. 2, so that the material of the porous transition layer 20 is suitable for being combined with the ceramic porous body 10 and the metal heating element respectively in the direction of increasing content of the component, thereby ensuring good combination stability of the atomization assembly.
In yet another embodiment, the porous transition layer 20 itself is formed by bonding a plurality of cermet composite layers, with the plurality of composite layers being of a transition design. Referring specifically to an example shown in fig. 3, the porous transition layer 20 includes 3 metal ceramic composite material layers, namely a first composite material layer 21a, a second composite material layer 21b and a third composite material layer 21c; the first composite material layer 21a contains 80% of ceramic and 20% of metal, the second composite material layer 21 contains 50% of ceramic and 50% of metal, and the third composite material layer 21c contains 20% of ceramic and 80% of metal. Thus, a transition in material compatibility with ceramics and metals is achieved by increasing the metal content layer by layer. Meanwhile, based on the effect of maintaining the bonding stress between the layers of the porous transition layer 20, on one hand, the thickness of the composite material layer is preferably controlled to be 0.08-0.15 mm, and the thickness of the whole porous transition layer 20 is not too large, preferably controlled to be 0.08-1 mm; on the other hand, the difference in the mass percentage content of the metal or ceramic component between the adjacent composite material layers is preferably not more than 40% in order to prevent the occurrence of compatibility and bondability problems inside the porous transition layer 20 due to an excessively large difference in the content.
In the cermet composite material of the porous transition layer 20, the ceramics and metals used for the porous body 10 and the heating element 30 are also used as the ceramic and metal components. And, more preferably, the ceramic component of the cermet composite material of the porous transition layer 20 is the same type of ceramic as that of the porous body 10, for example, when the porous body 10 is made of alumina ceramic, the ceramic component of the porous transition layer 20 is made of aluminum-based ceramic such as alumina or aluminum nitride, which can prevent the problem of interface bonding caused by using different types of ceramic. More preferably, the same ceramic component as the porous body 10 and the same metal component as the heating element 30 are used for the porous transition layer 20, and the interface bonding strength effect is more excellent.
Based on the description of the structure and the material of the atomization assembly, the invention further provides a preparation method of the atomization assembly, which is integrally carried out in a casting mode, and the preparation method in one embodiment comprises the following steps:
s10, mixing ceramic material powder for forming the porous body 10, a pore-forming agent and a casting auxiliary agent to prepare first casting slurry, and preparing a plurality of first casting films by a casting process;
s20, mixing ceramic and metal mixed material powder, a pore-forming agent and a casting auxiliary agent for forming the porous transition layer 20 to prepare second casting slurry, and preparing a plurality of second casting films by a casting process;
s30, mixing metal material powder for forming the heating element 30 and a casting auxiliary agent to prepare third casting slurry, and preparing a plurality of third casting membranes through a casting process;
s40, as shown in the figure 4, sequentially laminating the first casting film, the second casting film and the third casting film, and pressing to obtain a green body;
s50, sintering the green blank at the temperature of 700-1200 ℃ to obtain an atomization component precursor, wherein the structure of the atomization component precursor is shown in figure 5; in the sintering process, the first casting film in the green body forms a porous body 10, the second casting film forms a porous transition layer 20, and the third casting film forms a metal layer 30a; the microstructure of the atomization component real object can be seen in an electron microscope scanning image of the atomization component real object prepared in example 1 shown in FIG. 6;
s60, according to the shape and the thickness of the required heating element 30, processing treatment such as plane grinding, laser etching or etching is carried out on the metal layer 30a in the atomizing assembly precursor, and after the heating element 30 is formed by removing the redundant thickness and shape part, the atomizing assembly shown in FIG. 1 is obtained.
According to the preparation method, all functional parts in the atomization assembly are made into membranes in a tape casting film forming mode, and then the membranes are laminated and pressed into a green body and then sintered; the stable combination of each part is formed in the sintering process, and the bonding strength of each interface is more stable than that of a heating circuit formed by printing and sintering. And only one-time sintering is adopted in the production process, so that the energy consumption is lower, the economic benefit is better, and the formed atomization assembly has lower ablation deformation and is beneficial to the control of the product precision.
And based on the properties of the casting film, the process of pressing the laminated casting film into a green body in the step S40 is carried out by adopting a warm isostatic pressing process, and when the pressure is transferred and pressed by an isostatic pressing fluid medium, the pressure is equal in all directions, so that the uniform density of each layer of film material in the pressing process is kept all the time, and the local deformity and the like in the subsequent sintering process are effectively inhibited. The pressure of the medium temperature isostatic pressing is controlled to be 50-150 MPa, and the temperature is controlled to be 60-90 ℃.
Meanwhile, in order to ensure the uniformity of diaphragm preparation and the precision control of lamination pressing, the thicknesses of the first casting diaphragm, the second casting diaphragm and the third casting diaphragm formed in the steps S10 to S30 are all controlled to be about 0.1 mm.
Further, when the porous transition layer 20 is implemented by using the above preferred embodiment in which the metal content gradually changes, in the implementation of the preparation method of step S20, the mixed material powders with different metal content may be respectively used to prepare second casting slurries with different metal concentrations, and then the second casting films with different metal contents are formed by a casting process; and when the second casting film is laminated in the step S40, the second casting film is laminated according to the order of increasing the content of the metal component, so as to prepare the porous transition layer 20 with gradually changing metal content and components.
The casting auxiliary agent adopted in the steps S10 to S30 generally comprises components such as an adhesive, a dispersing agent, a plasticizer, a solvent and the like based on the technological requirements of casting film forming; and according to the requirement of good fluidity of the slurry required by the casting film-forming preparation process, the addition amount of the casting aid can be added according to 0.8-2.0 times of the weight of the material powder. Meanwhile, the solvent adopted in the casting auxiliary agent can comprise at least one of alcohols and ketones; the dispersant is at least one of vegetable oil, animal oil, glycerol trioleate and glycerol trioleate; the adhesive adopts polyvinyl butyral (PVB), and the plasticizer adopts dibutyl phthalate and the like.
Meanwhile, in the step S10, the addition amount and the size of the pore-forming agent are correspondingly added according to the final porosity and pore size required by each; in the implementation, the weight fraction of the material powder in the steps S10 and S20 is 20-40% according to the routine use requirement of the product, and the particle size of the pore-forming agent is correspondingly controlled in the range of 5-60 μm according to the pore size of the micropore to be formed. The pore-forming agent can be at least one of starch, wood dust, calcium carbonate, PMMA (polymethyl methacrylate) microspheres and graphite powder.
Further to facilitate verification of the consistency and stability of the performance of the atomization assembly prepared using the above process, the atomization assembly prepared is illustrated and the results are described below by way of specific examples.
Example 1
S10, mixing the alumina powder with the average grain size of 60 microns obtained by ball milling with a PMMA microsphere pore-forming agent with the average grain size of 50 microns according to a weight ratio of 60;
s21, mixing the aluminum oxide powder with the average particle size of 60 microns obtained by ball milling with nichrome powder according to a weight ratio of 4; casting the second casting slurry by using a thick film casting machine to form a second casting membrane which is 100 mu m in thickness, 6-10 inch in size and contains 80% of ceramic and 20% of metal;
s22, adjusting the weight ratio of the alumina powder to the nickel-chromium alloy powder in the same manner as the S21 to respectively prepare a second casting film containing 50% of ceramic and 50% of metal and a second casting film containing 20% of ceramic and 80% of metal;
s30, adding 1.2 times of composite auxiliary agent (commercially available) for casting film formation into the nichrome powder with the average grain size of 60 mu m obtained by ball milling to prepare third casting slurry, and casting the third casting slurry by using a thick film casting machine to form a plurality of third casting membranes with the thickness of 100 mu m and the size of 6-10 inch;
s40, stacking a first casting membrane, a second casting membrane containing 20% of metal, a second casting membrane containing 50% of metal, a second casting membrane containing 80% of metal and a third casting membrane in sequence according to the required thickness; pressing the laminated cast membrane by a warm water isostatic pressing machine, setting parameters to be 80 ℃ and pressure to be 120MPa, obtaining a green body after pressing, and cutting the green body according to the design size of a product according to the compression ratio of the pressing;
s50, sintering the green blank in a sintering furnace at 1000 ℃ for 1h in an air atmosphere to obtain an atomization component precursor;
and S60, performing plane grinding and laser etching treatment on the metal layer 30a in the atomizing assembly precursor to form the shape and the thickness of the designed heating element 30, and thus obtaining an atomizing assembly finished product.
The atomization component obtained in the above example was subjected to a sample test, and the atomization component prepared by printing a slurry of a conventional nichrome material powder and a sintering aid on the surface of an alumina porous ceramic body and then sintering the slurry at 1200 degrees was used as a comparison group to compare the overall process and product quality. The comparative results are given in the following table:
| number of samples | Resistance testing | Resistance rupture rate of 100 times of cycle | |
| Example 1 | 30 | 1.15±0.04Ω | 5％ |
| Comparative example | 30 | 1.15±0.08Ω | 15％ |
By combining the difference of fracture rates after the heating-cooling cycle is carried out for 100 times, the deformation conditions of concave-convex wrinkles of the heating elements are further checked for disassembly after use, and the naked eye directly shows that most of the heating elements 30 in the embodiment of the invention are only slight wrinkles, and compared heating element convex wrinkles have slight cracks, which shows that the deformation resistance of the heating elements can be improved through the interface bonding strength, so that the service life and the stability of the product are better.
The invention further provides an electronic cigarette atomizer comprising the atomizing assembly, wherein the structure of the electronic cigarette atomizer can be seen in fig. 7 in one embodiment, and the electronic cigarette atomizer comprises a hollow outer shell 100 with an open lower end, and a smoke channel 110 axially arranged in the outer shell 100, as can be further seen from the figure, the lower end of the smoke channel 110 is communicated with the atomizing cavity 320, and the upper end of the smoke channel is used for being communicated with a suction nozzle, so that the smoke oil aerosol generated by the internal atomizing assembly is output to the suction nozzle at the upper end of the outer shell 100 for being sucked. An oil storage chamber 120 for storing the tobacco tar is formed between the outer wall of the smoke passage 110 and the inner wall of the outer case 100.
A silica gel base 300 is further installed in the outer casing 100, and the silica gel base 300 is used to seal the oil storage chamber 120 to prevent the smoke from leaking, and can also be used as a carrier to provide a base for installing the atomizing assembly 200.
The open end of the outer shell 100 is further provided with an end cap 400, an atomizing cavity 320 is formed between the end cap 400 and the silica gel seat 300, and the atomizing cavity 320 is configured as a space for atomizing the smoke after the atomizing assembly 200 is installed; as can be seen, the atomizing assembly 200 in this embodiment is the atomizing assembly shown in the embodiment of FIG. 1; in implementation, the upper surface opposite to the heating element is configured as an oil suction surface, an oil guide hole 310 for guiding the smoke oil from the oil storage chamber to the atomizing assembly 200 is formed in the corresponding silicone base 300, one end of the oil guide hole 310 is connected to the oil storage chamber 120, and the other end is connected to the oil suction surface of the atomizing assembly 200. Meanwhile, the end cap 400 is further provided with a pair of electrode posts 500, which are respectively connected to the heating elements of the atomization assembly 200 as a positive electrode and a negative electrode, so as to supply power to the atomization assembly 200.
As shown in fig. 3, when the atomizer is in operation, the smoke oil is transported from the oil storage chamber 120 along the direction of arrow R1 to the oil absorption surface of the atomizing assembly 200 through the oil guide hole 310, and further transported to the atomizing surface through the micropores of the porous body 10, and the smoke oil aerosol generated by atomization escapes to the atomizing chamber 320; the air flow circulation process is that the user sucks the negative pressure generated by the suction nozzle 600 at the upper end of the smoke channel 110, so as to drive the external air flow to enter the atomizing cavity 320 from the lower end according to the direction of the arrow R2, then enter the smoke channel 110 together with the tobacco tar aerosol in the atomizing cavity 320, and finally output to the suction nozzle 600 at the upper end along the direction of the arrow R3 to be sucked, thereby forming a complete air flow circulation.
The invention further provides an electronic cigarette based on the atomizer, wherein the electronic cigarette comprises an atomizing device for absorbing tobacco tar and atomizing the tobacco tar and a power supply device for supplying power to the atomizing device; wherein the atomizing means is carried out using the electronic cigarette atomizer described above.
It should be noted that the preferred embodiments of the present invention are shown in the specification and the drawings, but the present invention is not limited to the embodiments described in the specification, and further, it will be apparent to those skilled in the art that modifications and changes can be made in the above description, and all such modifications and changes should fall within the protection scope of the appended claims.
Claims (11)
1. An electronic cigarette atomizer comprises an oil storage cavity and an atomizing assembly, wherein the oil storage cavity is used for storing tobacco tar, and the atomizing assembly is used for sucking the tobacco tar from the oil storage cavity and carrying out heating atomization; characterized in that the atomizing assembly comprises:
a porous body and a porous transition layer which are arranged in a stacked manner; the porous transition layer has a first surface opposite the porous body;
a heating element disposed on at least a portion of the first surface;
the porous body is made of a ceramic material, the heating element is made of a metal material, and the porous transition layer is made of a metal ceramic composite material; the content of the metal component in the porous transition layer gradually increases in a direction of the porous body toward the heat generating element.
2. The electronic aerosolizer of claim 1, wherein the ceramic component of the porous transition layer is the same as the porous body, and the metal component of the porous transition layer is the same as the heat-generating component.
3. The electronic aerosolizer of claim 1, wherein the porous transition layer comprises a plurality of layers of a cermet composite material laminated to one another in a direction of the porous body toward a heating element; and the content of the metal component in the plurality of composite material layers is gradually increased along the porous body toward the heating element.
4. The electronic aerosolizer of claim 3 wherein the mass percentages of the metal-containing component in two adjacent layers of the composite material differ by no more than 40%.
5. The electronic smoke atomizer according to any one of claims 1 to 4, wherein said porous transition layer has a thickness of 0.08 to 1mm.
6. The electronic smoke atomizer of any of claims 1 to 4, wherein efficiency of smoke oil conduction in said porous transition layer is higher than that of said porous body.
7. The electronic aerosolizer of any of claims 1-4, wherein the heating element does not completely cover the first surface to form a plurality of escape sites for release of aerosol generated by tobacco aerosol atomization.
8. A method of making an atomizing assembly, comprising the steps of:
mixing ceramic material powder for forming a porous body with a pore-forming agent to prepare first casting slurry, and forming a plurality of first casting films by a casting process;
mixing ceramic material powder and metal material powder for forming a porous transition layer with a pore-forming agent to prepare second casting slurry, and forming a plurality of second casting films by a casting process;
preparing metal material powder for forming the heating element into third casting slurry, and preparing a plurality of third casting membranes by a casting process;
sequentially laminating the first casting membrane, the second casting membrane and the third casting membrane in sequence and then pressing to obtain a green body; along the direction close to the third casting membrane, the content of the metal material in the plurality of second casting membranes is gradually increased;
sintering the green blank at the temperature of 700-1200 ℃ to obtain an atomization assembly precursor, wherein the atomization assembly precursor comprises a metal layer formed by sintering a third casting membrane;
and processing the metal layer to form the heating element.
9. The method of making an atomization assembly of claim 8 wherein the step of sequentially laminating the first, second, and third casting diaphragms followed by the step of pressing is performed using warm isostatic pressing.
10. An atomizing assembly characterized by being produced by the method of manufacturing an atomizing assembly according to claim 8 or 9.
11. An electronic cigarette comprising an aerosolization device and power supply means for powering the aerosolization device, wherein the aerosolization device is the electronic aerosolization apparatus of any one of claims 1-7.
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