CN114532607A

CN114532607A - Atomizing core reaches atomizer and electron cigarette including it

Info

Publication number: CN114532607A
Application number: CN202011330886.8A
Authority: CN
Inventors: 冯舒婷; 付尧; 钱亚明; 陈柳城
Original assignee: Shenzhen Relx Technology Co Ltd
Current assignee: Shenzhen Relx Technology Co Ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2022-05-27
Also published as: WO2022111135A1

Abstract

The application relates to an atomizing core and an atomizer and an electronic cigarette comprising the same. The atomization core comprises a porous ceramic matrix and a heating layer arranged on the porous ceramic matrix, wherein the porous ceramic matrix comprises a first material, a second material, a pore-forming agent and an optional sintering aid, and the weight percentage of the first material in the porous ceramic matrix is 5-30%. The porous ceramic matrix is prepared by combining a particle accumulation method and a pore-forming agent adding method, so that the porous ceramic matrix has proper heat conductivity coefficient and penetration speed, the problems of dry burning and oil leakage of the atomizing core can be effectively solved, the atomization efficiency of the smoke liquid is improved, and the fogging time is saved. The application of the electronic cigarette can achieve fast fogging speed and large cigarette amount, and improve smoking experience of users.

Description

Atomizing core reaches atomizer and electron cigarette including it

Technical Field

The present application relates to an atomizing device, especially, relate to an atomizing core and including its atomizer and electron cigarette.

Background

Due to the pursuit of personal health, environmental protection, and convenience in use, electronic cigarettes are becoming more and more popular with consumers as a substitute for conventional tobacco. The electronic cigarette or the electronic atomizer replaces the smoke generated by the traditional high-temperature combustion mode of tobacco by atomizing the smoking material at low temperature to form aerosol for the user to inhale. The cigarette liquid of the existing electronic cigarette is generally conveyed to the atomizing core for atomization under the capillary action, however, during smoking, scorched smell or other harmful substances are often generated due to dry burning or oil leakage of the atomizing core, the fogging time is long, the smoke amount is small, and the experience and the taste of a user are influenced.

Therefore, there is a need for further improvement and research on the atomizing core of the electronic cigarette.

Disclosure of Invention

The application provides an atomizing core, it can be used to the electron cigarette to including the porous ceramic base member that contains 5% -30% aluminium oxide in order to solve current atomizing core and haze slow and little scheduling problem of smog volume. The electronic cigarette comprising the atomizing core has the advantages of being fast in atomizing time, large in smoke amount, free of harmful substances such as tar and suspended particles and the like, and the experience and the taste of a user can be effectively improved.

According to an embodiment of the present application, there is provided an atomizing core including: a porous ceramic matrix; and the heating layer is arranged on the porous ceramic substrate, wherein the porous ceramic substrate comprises a first material, a second material, a pore-forming agent and an optional sintering aid, and the weight percentage of the first material in the porous ceramic substrate is 5-30%. Wherein the first material comprises at least one of alumina, aluminum nitride, or zirconia and the second material comprises at least one of silica, calcia, magnesia, silicon nitride, or silicon carbide.

According to another embodiment of the present application, there is provided an atomizer comprising: the liquid storage cavity is used for containing liquid; and the atomization core absorbs the liquid from the liquid storage cavity and atomizes the liquid.

According to yet another embodiment of the present application, there is provided an electronic cigarette comprising the atomizer described above.

Additional aspects and advantages of embodiments of the present application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of the present application.

Drawings

Drawings necessary for describing embodiments of the present application or the prior art will be briefly described below in order to describe the embodiments of the present application. It is to be understood that the drawings in the following description are only some of the embodiments of the present application. It will be apparent to those skilled in the art that other embodiments of the drawings can be obtained from the structures illustrated in these drawings without the need for inventive work.

Fig. 1 is a schematic structural view of an atomizing core according to an embodiment of the present application.

Detailed Description

Embodiments of the present application will be described in detail below. The examples of the present application should not be construed as limiting the present application.

Additionally, amounts, ratios, and other numerical values are sometimes presented herein in a range format. It is to be understood that such range format is used for convenience and brevity, and should be interpreted flexibly to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited.

As used herein, the terms "substantially", "substantially" and "about" are used to describe and illustrate minor variations. When used in conjunction with an event or circumstance, the terms can refer to instances where the event or circumstance occurs precisely as well as instances where the event or circumstance occurs in close proximity. For example, when used in conjunction with numerical values, the term can refer to a range of variation that is less than or equal to ± 10% of the stated numerical value, such as less than or equal to ± 5%, less than or equal to ± 4%, less than or equal to ± 3%, less than or equal to ± 2%, less than or equal to ± 1%, less than or equal to ± 0.5%, less than or equal to ± 0.1%, or less than or equal to ± 0.05%. For example, two numerical values are considered to be "substantially" identical if the difference between the two numerical values is less than or equal to ± 10% (e.g., less than or equal to ± 5%, less than or equal to ± 4%, less than or equal to ± 3%, less than or equal to ± 2%, less than or equal to ± 1%, less than or equal to ± 0.5%, less than or equal to ± 0.1%, or less than or equal to ± 0.05%) of the mean of the values.

Also, for convenience of description, "first," "second," "third," and the like may be used herein to distinguish between different components. "first," "second," "third," and the like are not intended to limit the corresponding components.

In the detailed description and claims, a list of items linked by the term "at least one of," "at least one of," or other similar terms may mean any combination of the listed items. For example, if items a and B are listed, the phrase "at least one of a and B" means a only; only B; or A and B. In another example, if items A, B and C are listed, the phrase "at least one of A, B and C" means a only; or only B; only C; a and B (excluding C); a and C (excluding B); b and C (excluding A); or A, B and C. Item A may comprise a single component or multiple components. Item B may comprise a single component or multiple components. Item C may comprise a single component or multiple components.

The substances used in the present application can be commercially available unless otherwise specified.

As shown in fig. 1, an embodiment of the present application provides an atomizing core 100 for an electronic cigarette, which includes a porous ceramic base 110 and a heat generating layer 120, the heat generating layer 120 being disposed on the porous ceramic base 110. The porous ceramic substrate 110 has a large number of micropores, and can adsorb the smoke solution, so that the smoke solution is heated and atomized into smoke gas when the heating layer 120 is powered on.

The inventor researches and finds that the heat conductivity coefficient of the porous ceramic matrix 110 has an important influence on the atomization efficiency of the atomization core 100, and the heat loss of the heating layer 120 can be reduced by changing the heat conductivity coefficient of the porous ceramic matrix 110, so that the atomization efficiency of the tobacco juice is improved, and the atomization time of the atomization core 100 is saved, thereby realizing more efficient tobacco juice-smoke conversion under the same power, obtaining faster atomization speed, and realizing larger amount of smoke.

The inventor further researches and discovers that the permeation speed of the porous ceramic matrix 110 has an important influence on the atomization efficiency of the atomization core 100, and the problem of dry burning or oil leakage of the atomization core can be solved by changing the permeation speed of the porous ceramic matrix 110. And, when the permeation speed of the porous ceramic base 110 is controlled within a certain range, the permeation speed of the porous ceramic base 110 is matched with the heating efficiency of the heat generating layer 120, so that the maximum amount of smoke can be realized to provide a better smoking experience for a user.

The heat conductivity coefficient and the permeation speed of the porous ceramic matrix are closely related to the material composition, the pore diameter and the porosity of the porous ceramic matrix. However, the porous ceramic matrix prepared by the current industrially common preparation method has the disadvantages of uneven distribution of voids, lower porosity, poor mechanical properties, low production efficiency and the like, and the porous ceramic matrix with low thermal conductivity and proper permeation rate is difficult to realize. Therefore, the inventor combines a particle stacking method and a pore-forming agent adding method to prepare the porous ceramic matrix, so that the porous ceramic matrix has the advantages of high porosity, low thermal conductivity, controllable pore diameter, excellent mechanical property, high process stability and the like.

The present application provides an atomizing core 100, which includes a porous ceramic substrate 110 and a heat generating layer 120 disposed on the porous ceramic substrate 110, wherein the porous ceramic substrate 110 includes alumina, silica, a pore former, and optionally a sintering aid, and the weight percentage of the alumina in the porous ceramic substrate 110 is about 5% to about 30%.

In some embodiments, the porous ceramic matrix 110 includes a first material, a second material, a sintering aid, and a pore former in a weight ratio of (5-30): (40-70): (1-10): (10-20). For example, in some embodiments, the weight ratio of the first material, the second material, the pore former, and the sintering aid may be 5:70:5:20, 10:65:5:20, 15:60:5:20, 15:65:5:15, 20:55:5:20, 20:50:10:20, 25:45:10:20, 25:50:10:15, 30:40:10:20, or 30:45:10:15, etc.

In some embodiments, the weight ratio of the first material, the second material, the sintering aid, and the pore former may be (5-20): (55-70): (1-8): (10-20). For example, in some embodiments, the weight ratio of the first material, the second material, the pore former, and the sintering aid may be 5:70:5:20, 5:70:8:17, 10:65:5:20, 10:70:5:15, 10:70:8:12, 15:60:5:20, 15:65:5:15, 15:70:5:10, 20:55:5:20, or 20:65:5:10, etc.

In some embodiments, the first material may include at least one of alumina, aluminum nitride, or zirconia. In some embodiments, the second material may include at least one of silicon dioxide, calcium oxide, magnesium oxide, silicon nitride, or silicon carbide. In some embodiments, the first material is alumina and the second material is silica.

In some embodiments, the pore former comprises at least one of wood chips, graphite, carbon powder, cellulose, or starch.

In some embodiments, the sintering aid comprises at least one of calcium carbonate, magnesium carbonate, talc, or sodium silicate. The sintering aid may improve the flexural strength and scratch resistance of the porous ceramic matrix 110.

In some embodiments, the porous ceramic matrix 110 may include alumina, silica, calcium carbonate, and cellulose. In some embodiments, the porous ceramic matrix 110 may include alumina, silica, magnesium carbonate, and starch. In some embodiments, the porous ceramic matrix 110 may include alumina, silica, sodium silicate, and carbon powder.

In some embodiments, the porous ceramic matrix 110 has a thermal conductivity of about 0.4W/mK to about 1.0W/mK. For example, in some embodiments, the porous ceramic matrix 110 may have a thermal conductivity of about 0.4W/mK, about 0.45W/mK, about 0.5W/mK, about 0.55W/mK, about 0.6W/mK, about 0.65W/mK, about 0.7W/mK, about 0.75W/mK, about 0.8W/mK, about 0.85W/mK, about 0.9W/mK, about 0.95W/mK, about 1.0W/mK, or a range consisting of any two of the above values, such as about 0.4W/mK to about 0.8W/mK, about 0.5W/mK to about 0.7W/mK, about 0.5W/mK to about 0.8W/mK, about 0.5W/mK to about 0.85W/mK, or about 0.5W/mK to about 1.0W/mK. Because the porous ceramic base 110 of the present application has a small thermal conductivity, the heat generated by the heat generating layer 120 can be isolated from being conducted to the porous ceramic base 110, and the heat loss of the heat generating layer 120 is reduced.

In some embodiments, the porous ceramic matrix 110 may have a pore size (D50) of about 15 μm to about 25 μm. For example, in some embodiments, the pore size of the porous ceramic matrix 110 may be about 15 μm, about 16 μm, about 17 μm, about 18 μm, about 19 μm, about 20 μm, about 21 μm, about 22 μm, about 23 μm, about 24 μm, about 25 μm, or may be a range consisting of any two of the above values, such as about 15 μm to about 20 μm, about 15 μm to about 22 μm, or about 20 μm to about 25 μm.

In some embodiments, the porous ceramic matrix 110 may have a porosity of about 30% to about 50%. For example, in some embodiments, the porosity of the porous ceramic matrix 110 may be about 30%, about 35%, about 38%, about 40%, about 41%, about 42%, about 43%, about 44%, about 45%, about 46%, about 47%, about 48%, about 49%, about 50%, or may be in a range consisting of any two of the above values, such as about 30% to about 45%, about 40% to about 50%, or about 45% to about 50%, and the like.

The particles on the surface of the porous ceramic matrix 110 may be peeled off by an external force, which is manifested by the scratch resistance of the porous ceramic matrix. The material composition, pore size, and porosity of the porous ceramic matrix 110 determine the scratch resistance of the porous ceramic matrix 110. In some embodiments, the porous ceramic matrix has a scratch resistance ranging from about 0.5 wt% to about 5 wt%. For example, in some embodiments, the scratch resistance of the porous ceramic matrix ranges from about 0.5 wt%, about 0.6 wt%, about 0.7 wt%, about 0.8 wt%, about 0.9 wt%, about 1.0 wt%, about 1.5 wt%, about 2.0 wt%, about 2.5 wt%, about 3.0 wt%, about 3.5 wt%, about 4.0 wt%, about 4.5 wt%, about 5.0 wt%, or can range from any two of the above values, such as from about 0.5 wt% to about 1 wt%, from about 1 wt% to about 3 wt%, or from about 3 wt% to about 5 wt%, etc. The porous ceramic matrix 110 has good scratch resistance and can reduce or prevent ceramic dusting.

In some embodiments, the flexural strength of the porous ceramic matrix 110 may be between about 6MPa and about 15 MPa. For example, in some embodiments, the flexural strength of the porous ceramic matrix 110 may be about 6Mpa, about 6.5Mpa, about 7Mpa, about 7.5Mpa, about 8Mpa, about 8.5Mpa, about 9Mpa, about 9.5Mpa, about 10Mpa, about 10.5Mpa, about 11Mpa, about 11.5Mpa, about 12Mpa, about 12.5Mpa, about 13Mpa, about 13.5Mpa, about 14Mpa, about 14.5Mpa, about 15Mpa, or may be any two of the above, such as 6Mpa to about 10Mpa, 6Mpa to about 12Mpa, 9Mpa to about 12Mpa, 10Mpa to about 12Mpa, about 9Mpa to about 13Mpa, or about 10Mpa to about 15Mpa, and the like. The porous ceramic substrate 110 has a large bending strength, and can meet the requirement of automated assembly, and further, can meet the strength requirement of an automated gripper/sucker and the requirement of assembly pressure of a thimble in a cartridge.

In some embodiments, the porous ceramic matrix 110 has a thickness of about 0.5mm to about 4 mm. In some embodiments, the porous ceramic matrix 110 may have a thickness of about 0.5mm, about 1.0mm, about 1.5mm, about 2.0mm, about 2.5mm, about 3.0mm, about 3.5mm, about 4.0mm, or may range from any two of the above numerical compositions, such as from about 0.5mm to about 2mm, from about 1.0mm to about 4mm, from about 1.5mm to about 3mm, or from about 2.0mm to about 4mm, and the like.

In some embodiments, the porous ceramic matrix 110 may have a permeation rate of about 0.8mg/s.bar.mm²To about 4.0mg/s.bar.mm². In this application, the permeation rate is expressed in units of area (mm)²) The weight of the smoke passing through the porous ceramic matrix per unit pressure (bar) and per unit time(s). When the penetration rate of the porous ceramic matrix 110 is more than 4.0mg/s.bar.mm²In time, the oil dropping speed of the tobacco liquid is too high, so that some tobacco liquid is not atomized and is inhaled by a user along with the smoke, and the experience similar to oil leakage is generated. When the penetration rate of the porous ceramic matrix 110 is less than 0.8mg/s.bar.mm²In the meantime, the smoke liquid flows in the porous ceramic substrate 110 at a too slow speed, and a dry burning phenomenon occurs, thereby generating harmful substances such as formaldehyde. In some embodiments, the porous ceramic matrix 110 may have a permeation rate of about 0.8mg/s.bar.mm²About 0.9mg/s.bar.mm²About 0.96mg/s.bar.mm²About 1.0mg/s.bar.mm²About 1.2mg/s.bar.mm²About 1.5mg/s.bar.mm²About 1.8mg/s.bar.mm²About 2.0mg/s.bar.mm²About 2.3mg/s.bar.mm²About 2.5mg/s.bar.mm²About 2.8mg/s.bar.mm²About 3.0mg/s.bar.mm²About 3.5mg/s.bar.mm²About 3.6mg/s.bar.mm²About 3.8mg/s.bar.mm²About 3.85mg/s.bar.mm²About 4.0mg/s.bar.mm²Or may range between any two of the above values, e.g., about 0.8mg/s.bar.mm²To about 2.0mg/s.bar.mm²About 0.9mg/s.bar.mm²To about 2.5mg/s.bar.mm²About 0.96mg/s.bar.mm²To about 3.85mg/s.bar.mm²About 1.35mg/s.bar.mm²To about 2.88mg/s.bar.mm²About 1.54mg/s.bar.mm²To about 2.88mg/s.bar.mm²About 1.5mg/s.bar.mm²To about 3.85mg/s.bar.mm²Or 1.5mg/s.bar.mm²To about 3.0mg/s.bar.mm²。

The present application combines the use of a particle packing method with the use of an additive pore former method to prepare the porous ceramic matrix 110. Specifically, alumina, silica, a sintering aid and a pore-forming agent are uniformly mixed according to a certain weight ratio, then the mixed powder is placed into a mold for molding to obtain a green body, and the green body is sintered at a certain temperature to obtain the porous ceramic matrix 110.

The heat generating layer 120 may be disposed on the porous ceramic base 110 in various suitable manners. For example, the heat generating layer 120 may be provided on the porous ceramic base 110 by sputtering, transfer, or photolithography. When the heat generating layer 120 is sputtered, transferred, or lithographically printed onto the porous ceramic base 110, a portion of the heat generating layer material may penetrate into the porous ceramic base 110, thereby forming a physical occlusion region with the porous ceramic base 110. In some embodiments, the physical nip has a depth of 10 μm to 60 μm to improve the bending strength of the porous ceramic substrate 110 and the peeling resistance (dusting) of the heat generating layer 120. The heating layer 120 may include a heating wire, and the heating wire may include at least one of iron, aluminum, platinum, palladium, iron-aluminum alloy, iron-nickel alloy, iron-chromium-aluminum alloy, iron-chromium alloy, palladium-copper alloy, gold-silver-platinum alloy, gold-silver alloy, palladium-silver alloy, or gold-platinum alloy.

According to another aspect of the present application, there is also provided an atomizer comprising a reservoir chamber and an atomizing cartridge of the present application. Liquid can be acceptd in the stock solution chamber, and atomizing core can be followed the stock solution chamber absorbs liquid and atomizes liquid.

In some embodiments, the heat generating power of the atomizer may be 6.5W to 18W. For example, in some embodiments, the heat-generating power of the atomizer may be about 6.5W, about 7W, about 8W, about 9W, about 10W, about 11W, about 12W, about 13W, about 14W, about 15W, about 16W, about 17W, about 18W, or may be in a range of any two of the above numerical compositions, such as about 6.5W to about 10W, about 6.5W to about 15W, or about 10W to about 18W.

According to yet another aspect of the present application, there is also provided an electronic cigarette comprising the atomizer of the present application. The tobacco juice of the electronic cigarette can be atomized by the atomizer to generate aerosol for a user to inhale. According to the embodiment of the application, the electronic cigarette of this application no longer burns futilely or the oil leak to smog volume can satisfy user's needs, provides better taste and experience for the user.

In some embodiments, the e-cigarette has a fogging time of about 0.2s to about 0.5 s. For example, in some embodiments, the e-cigarette may have a fogging time of about 0.2s, about 0.25s, about 0.3s, about 0.35s, about 0.4s, about 0.45s, or about 0.5s or may range from any two of the above values, such as from about 0.2s to about 0.4s or from about 0.3s to about 0.5 s. The application discloses electron cigarette has faster hazing speed because of the atomizing core for first mouthful of smog has better experience.

In some embodiments, the life of the e-cigarette may be from about 500 to about 1000 mouths. In some embodiments, the e-cigarette may have a useful life of about 500, about 600, about 700, about 800, about 900, or about 1000, or may range from any two of the above values, such as from about 500 to about 800 or from about 800 to about 1000. The service life of the atomizing core in the application is measured by the following method: sufficient tobacco liquid is given, a cycle of 55mL of smoking volume and 3 seconds of smoking pause is taken as one cycle, the cycle is continuously stopped until the smoke amount TPM is less than 5mg, and the number of the cycles at the moment is recorded as the service life of the atomizing core. The utility model provides an electron cigarette can avoid dry combustion method and oil leak problem, realizes smog volume maximize and has longer life.

In some embodiments, the e-cigarette has a smoke mass (TPM) of about 4mg to about 6.5mg per mouth. In the present application, the smoke capacity of each mouth was 55mL, and the suction time of each mouth was 3 seconds. Through statistics on the smoke demands of a large number of users, the smoking experience can be better only when the smoke amount is at least 4mg, and the experience is better when the smoke amount is 5-6.5 mg. In some embodiments, the electronic cigarette has an aerosol amount of about 4mg, about 4.5mg, about 5mg, about 5.5mg, about 6mg, about 6.5mg per mouth, or may range from any two of the above numerical compositions, such as about 5mg to about 6mg, about 5.5mg to about 6mg, about 4mg to about 5mg, or about 5mg to about 6.5mg, etc.

Examples

In order to facilitate a better understanding of the present application, the following examples are set forth. These examples belong to the scope of protection of the present application, but do not limit the scope of protection of the present application.

The preparation method comprises the following steps:

porous ceramic matrix: the alumina, the silica sintering aid and the pore-forming agent are uniformly mixed in the proportion shown in the following tables 1-1, 2-1 and 3-1 respectively in the examples and comparative examples, then the mixed powder is put into a mold to be molded to obtain a green body, and the green body is sintered at a certain temperature to obtain the porous ceramic matrix.

An atomizer: the heating wire was disposed on the prepared porous ceramic substrate to obtain atomizing cores in each of examples and comparative examples. The atomizing core is then combined with the reservoir to produce an atomizer.

Electronic cigarette: and assembling the prepared atomizer with a battery assembly, a tobacco rod and the like to prepare the electronic cigarette.

The test method comprises the following steps:

penetration rate: sealing and fixing a porous ceramic matrix sample at one end of a glass tube, wherein the convex surface of the ceramic faces outwards, the diameter of the tube is 10mm, and the height of the tobacco tar is 20 cm; the time was 30min from the first drop of smoke production, the weight of the smoke during this process was weighed and the oil-bleed rate (mg/s) was calculated. The viscosity of the tobacco juice was 180 pa.s.

Scratch resistance: selecting a 1kg weight, pressing the porous ceramic matrix sample on 240-mesh sand paper to rub for 15cm, weighing the weight change of the porous ceramic matrix sample before and after the friction, and calculating the change rate.

Testing the smoke amount: the suction volume for each bite was 55mL, the suction time for each bite was 3 seconds, each cycle was 3 seconds of suction and 15 seconds of rest, and one test was performed every ten cycles. The amount of smoke per mouth is ten cycles of total smoke/10.

Coefficient of thermal conductivity: the porous ceramic matrix is tested by a hot wire method by a thermal conductivity meter, and the testing temperature is 200 ℃.

Bending strength: the porous ceramic matrix sample is tested on a universal material testing machine, and the loading rate is 0.5mm/min by adopting a three-point bending method for measurement. The calculation formula is as follows: rf is 3F × L/(2 × b × h × h). Wherein Rf is bending strength (Mpa), F is load (Kg) when the sample is broken, L is distance (cm) between supporting knife edges, b is width (cm) of the sample at the broken part, and h is thickness (cm) of the sample at the broken part.

Fogging time: 1. connecting the electronic cigarette with a smoking machine, and starting a 3S smoking and 15S stopping mode; 2. and shooting by aiming at the cigarette holder by using a high-speed camera, and then selecting a time difference value from the lighting of the smoking set indicator lamp to the beginning of the smoke generation of the cigarette holder from the video as the fogging time.

Service life of atomizing core: sufficient tobacco liquid is given, a cycle of 55mL of smoking volume and 3 seconds of smoking pause is taken as one cycle, the cycle is continuously stopped until the smoke amount TPM is less than 5mg, and the number of the cycles at the moment is recorded as the service life of the atomizing core.

And (3) testing results:

firstly, the weight ratio of alumina, silicon dioxide, sintering aid and pore-forming agent in the porous ceramic matrix is (5-20): 55-70): 1-8): 10-20.

The composition of the porous ceramic substrates of examples 1-1 to 1-16 is shown in Table 1-1. Table 1-2 shows the relationship between the pore size, porosity and thermal conductivity of the porous ceramic matrix in the atomizing cores of examples 1-1 to 1-9 and the fogging time. The porous ceramic substrates of examples 1-1 to 1-16 had a thickness of 1mm and a heat generation power of 6.5W.

TABLE 1-1

Tables 1 to 2

	Pore diameter/mum	Porosity/%	Thermal conductivity coefficient/(W/mK)	Fogging time/s
					Examples 1 to 1	25	50	0.4	0.2
Examples 1 to 2	25	48	0.45	0.3
					Examples 1 to 3	20	48	0.5	0.35
Examples 1 to 4	20	45	0.55	0.35
					Examples 1 to 5	19	45	0.6	0.4
Examples 1 to 6	19	43	0.65	0.45
					Examples 1 to 7	17	43	0.7	0.45
Examples 1 to 8	15	40	0.8	0.5
					Examples 1 to 9	15	36	1.0	0.55

Tables 1 to 3 show the relationship between the pore size and porosity of the porous ceramic matrix and the permeation rate in the electronic cigarettes of examples 1 to 1, 1 to 8, and 1 to 10 to 1 to 16.

Tables 1 to 3

Tables 1 to 4 show the relationship between the pore size and porosity of the porous ceramic matrices of examples 1 to 1, 1 to 8, and 1 to 10 to 1 to 16, and the scratch resistance and the bending strength.

Tables 1 to 4

	Pore diameter/mum	Porosity/%	Scratch resistance/%	Bending strength/Mpa
					Examples 1 to 10	14	40	2.5	9.5
Examples 1 to 8	15	40	3	9
					Examples 1 to 11	15	43	3.2	8.5
Examples 1 to 12	18	45	3.7	8
					Examples 1 to 13	20	50	4	7.5
Examples 1 to 14	22	50	4.5	7
					Examples 1 to 15	23	50	4.8	6.8
Examples 1 to 1	25	50	5	6.5
					Examples 1 to 16	25	53	5.3	6

Tables 1 to 5 show the relationship between the permeation speed of the porous ceramic matrix in the electronic cigarettes of examples 1 to 1, 1 to 8, and 1 to 10 to 1 to 16, the amount of smoke and the temperature of the heater, and the service life of the electronic cigarettes.

Tables 1 to 5

As can be seen from tables 1-1 to 1-5, when the weight ratio of alumina, silica, sintering aid and pore former in the porous ceramic matrix is (5-20): (55-70): 1-8): 10-20), the pore size of the porous ceramic matrix is 15 μm-25 μm and the porosity of the porous ceramic matrix is 40% -50%, the thermal conductivity of the porous ceramic matrix is 0.4KW/mK-0.8W/mK, and the permeation rate of the porous ceramic matrix is 0.8mg/s.bar²-4.0mg/s.bar.mm²So that the atomizing core can have a fogging time of 0.2s to 0.5s and a smoke amount of 4.5mg to 6.5 mg. Therefore, the first group of atomizing cores can achieve high atomizing speed and high smoke amount, and accordingly smoking experience of a user is improved.

And the weight ratio of the alumina, the silicon dioxide, the sintering aid and the pore-forming agent in the porous ceramic matrix is (20-30): (40-50): 5-10): 10-20.

The composition of the porous ceramic substrates of examples 2-1 to 2-10 is shown in Table 2-1. Table 2-2 shows the relationship between the pore size, porosity and thermal conductivity of the porous ceramic matrix in the atomizing cores of examples 2-1 to 2-6 and the fogging time.

The porous ceramic substrates of examples 2-1 to 2-10 had a thickness of 2mm and a heat generation power of 9W.

TABLE 2-1

Tables 2 to 2

	Pore diameter/mum	Porosity/%	Thermal conductivity coefficient/(W/mK)	Fogging time/s
					Example 2-1	25	50	0.5	0.3
Examples 2 to 2	23	50	0.6	0.35
					Examples 2 to 3	20	50	0.75	0.4
Examples 2 to 4	20	40	0.9	0.45
					Examples 2 to 5	20	30	1	0.5
Examples 2 to 6	15	30	1.2	0.55

Table 2-3 shows the relationship between the pore size and porosity of the porous ceramic matrix and the permeation rate in the electronic cigarettes of example 2-1, examples 2-7 to 2-10.

Tables 2 to 3

	Pore diameter/mum	Porosity/%	Penetration rate/(mg/s.bar.mm)²)
				Example 2-1	25	50	3.85
Examples 2 to 7	22	50	3.6
				Examples 2 to 8	22	48	3.1
Examples 2 to 9	20	48	2.3
				Examples 2 to 10	20	40	1.5

Tables 2 to 4 show the relationship between the pore size and porosity of the porous ceramic matrices of examples 2-1, 2-7 to 2-10, and the scratch resistance and the bending strength.

Tables 2 to 4

	Pore diameter/mum	Porosity/%	Scratch resistance/%	Bending strength/Mpa
					Example 2-1	25	50	1	7
Examples 2 to 7	22	50	0.9	7.5
					Examples 2 to 8	22	48	0.8	7.8
Examples 2 to 9	20	48	0.7	8
					Examples 2 to 10	20	40	0.5	10

Table 2-5 shows the relationship between the permeation speed of the porous ceramic substrate in the electronic cigarette of example 2-1, example 2-7 to example 2-10, and the amount of smoke and the temperature of the heating element, and the service life of the electronic cigarette.

Tables 2 to 5

As can be seen from tables 2-1 to 2-5, when the weight ratio of alumina, silica, sintering aid and pore former in the porous ceramic matrix is (20-30): (40-50): (5-10): 10-20), the pore size of the porous ceramic matrix is 20 μm-25 μm and the porosity of the porous ceramic matrix is 30% -50%, the thermal conductivity of the porous ceramic matrix is 0.5KW/mK-1.0W/mK, and the permeation rate of the porous ceramic matrix is 1.5mg/s.bar²-3.85mg/s.bar.mm²So that the atomizing core can have a fogging time of 0.3s to 0.5s and a smoke amount of 5.5mg to 6.5 mg. Thus, the second set of atomizing cores can also achieve faster fogging speed and higher amount of fog.

Thirdly, comparison example: the weight ratio of the alumina, the silicon dioxide, the sintering aid and the pore-forming agent in the porous ceramic matrix is (35-50): (30-50): 7-15): 5-10.

The composition of the porous ceramic substrates of comparative examples 3-1 to 3-4 is shown in Table 3-1. Table 3-2 shows the relationship between the pore diameter, porosity, thermal conductivity, fogging time, scratch resistance, smoke amount, and heater temperature of the porous ceramic matrices in the atomizing cores of comparative examples 3-1 to 3-4. The porous ceramic substrates of comparative examples 3-1 to 3-4 had a thickness of 1mm and a heat generation power of 6.5W.

TABLE 3-1

TABLE 3-2

As can be seen by comparing the first group of examples (examples 1-1 to 1-16), the second group of examples (examples 2-1 to 2-10), and the third group of comparative examples (comparative examples 3-1 to 3-4), when the porous ceramic matrix includes alumina in an amount of 5 to 30% by weight, the scratch resistance of the porous ceramic matrix is greatly improved, and the porous ceramic matrix realizes a larger amount of haze, a smaller fogging time, and a longer service life.

Reference throughout this specification to "some embodiments," "one embodiment," "another example," "an example," "a specific example," or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. Thus, throughout the specification, descriptions appear, for example: "in some embodiments," "in an embodiment," "in one embodiment," "in another example," "in one example," "in a particular example," or "an example," which do not necessarily refer to the same embodiment or example in this application. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

Although illustrative embodiments have been illustrated and described, it will be appreciated by those skilled in the art that the above embodiments are not to be construed as limiting the application and that changes, substitutions and alterations can be made to the embodiments without departing from the spirit, principles and scope of the application.

Claims

1. An atomizing core, comprising:

a porous ceramic matrix; and

a heat generating layer disposed on the porous ceramic substrate,

wherein the porous ceramic substrate comprises a first material, a second material, a pore former and an optional sintering aid, the weight percentage of the first material in the porous ceramic substrate is 5-30%,

wherein the first material comprises at least one of alumina, aluminum nitride, or zirconia and the second material comprises at least one of silica, calcia, magnesia, silicon nitride, or silicon carbide.

2. The atomizing core of claim 1, wherein the weight ratio of the first material, the second material, the sintering aid, and the pore former is (5-30): (40-70): (1-10): (10-20), preferably (5-20): (55-70): (1-8): (10-20).

3. The atomizing core of claim 1, wherein the pore former includes at least one of wood chips, graphite, carbon powder, cellulose, or starch.

4. The atomizing core of claim 1, the sintering aid comprising at least one of calcium carbonate, magnesium carbonate, talc, or sodium silicate.

5. The atomizing core of claim 1, wherein the porous ceramic matrix has a thermal conductivity of 0.4W/mK to 1.0W/mK.

6. The atomizing core of claim 1, wherein the porous ceramic matrix has a pore size of 15 μ ι η to 25 μ ι η.

7. The atomizing core of claim 1, wherein the porous ceramic matrix has a porosity of 30% -50%.

8. The atomizing core of claim 1, wherein the porous ceramic matrix exhibits a scratch resistance in a range of 0.5 wt% to 5 wt%.

9. The atomizing core of claim 1, wherein the porous ceramic matrix has a flexural strength of 6Mpa to 15 Mpa.

10. The atomizing core of claim 1, wherein the porous ceramic matrix has a thickness of 0.5mm to 4 mm.

11. The atomizing core of claim 1, wherein the porous ceramic matrix has a penetration rate of 0.8mg/s.bar.mm²To 4.0mg/s.bar.mm²。

12. The atomizing core of claim 1, wherein the heating layer includes a heater including at least one of iron, aluminum, platinum, palladium, an iron-aluminum alloy, an iron-nickel alloy, an iron-chromium-aluminum alloy, an iron-chromium alloy, a palladium-copper alloy, a gold-silver-platinum alloy, a gold-silver alloy, a palladium-silver alloy, or a gold-platinum alloy.

13. An atomizer, comprising:

the liquid storage cavity is used for containing liquid; and

the atomizing cartridge of any one of claims 1 to 12, which absorbs liquid from the reservoir chamber and atomizes the liquid.

14. The nebulizer of claim 13, wherein the liquid has a viscosity of 120mpa.s-200 mpa.s.

15. The atomizer of claim 13, wherein the heat generating power of the atomizer is 6.5W-18W.

16. An electronic cigarette comprising a nebulizer according to any one of claims 13 to 15.

17. The electronic cigarette of claim 16, wherein the e-cigarette has a fogging time of 0.2s-0.5 s.

18. The electronic cigarette of claim 16, wherein the electronic cigarette has a smoke volume of 4mg-6.5mg per mouth.