WO2022111135A1 - Atomizing core, atomizer comprising same, and electronic cigarette - Google Patents

Abstract

An atomizing core (100), an atomizer comprising same, and an electronic cigarette. The atomizing core (100) comprises a porous ceramic matrix (110) and a heating layer (120) arranged on the porous ceramic matrix (110), wherein the porous ceramic matrix (110) 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 (110) is 5%-30%. The porous ceramic matrix (110) is prepared by combining a particle accumulation method and a pore forming agent adding method, such that the porous ceramic matrix (110) has a suitable heat conductivity coefficient and seepage velocity, and therefore, the problems of dry burning and e-liquid leakage of the atomizing core (100) can be effectively solved, the efficiency of e-liquid atomization is improved, and the vapor generation time is reduced. Therefore, the electronic cigarette can achieve a relatively high vapor generation speed and a relatively large vapor amount, thereby improving the vaping experience of a user.

Description

Atomizing core and atomizer and electronic cigarette including the same technical field

The present application relates to an atomizing device, and in particular, to an atomizing core, an atomizer and an electronic cigarette including the same.

Background technique

Due to the pursuit of personal health, environmental protection and convenience of use, electronic cigarettes are increasingly favored by consumers as a substitute for traditional tobacco. Electronic cigarettes or electronic atomizers replace the smoke produced by the high-temperature combustion of traditional tobacco by atomizing the smoking material at low temperature to form aerosol for users to inhale. The e-liquid of existing electronic cigarettes is usually transported to the atomizing core for atomization under capillary action. However, during smoking, burnt smell or other harmful substances are often produced due to dry burning or oil leakage of the atomizing core, and the fogging time is long. , The amount of smoke is small, which affects the user's experience and taste.

Therefore, it is necessary to further improve and research the atomizing core of electronic cigarettes.

SUMMARY OF THE INVENTION

The present application provides an atomizing core, which can be used in electronic cigarettes, and includes a porous ceramic matrix containing 5%-30% alumina to solve the problems of slow fogging and small smoke volume of the existing atomizing core. The electronic cigarette including the atomizing core of the present application has the advantages of faster fogging time, larger smoke volume, and no harmful substances such as tar and suspended particles, which can effectively improve the user's experience and taste.

According to an embodiment of the present application, the present application provides an atomizing core, which includes: a porous ceramic substrate; and a heat generating layer disposed on the porous ceramic substrate, wherein the porous ceramic substrate includes a first material, a second Two materials, a pore-forming agent and an optional sintering aid, the weight percentage of the first material in the porous ceramic substrate is 5%-30%. Wherein the first material includes at least one of alumina, aluminum nitride or zirconia, and the second material includes at least one of silicon dioxide, calcium oxide, magnesium oxide, silicon nitride or silicon carbide.

According to another embodiment of the present application, the present application provides an atomizer, which includes: a liquid storage cavity for containing liquid; and the above-mentioned atomization core, the atomization core absorbs liquid from the liquid storage cavity and atomize the liquid.

According to another embodiment of the present application, the present application provides an electronic cigarette, which includes the above atomizer.

Additional aspects and advantages of the embodiments of the present application will be described, shown, or explained in part through the implementation of the embodiments of the present application in the subsequent description.

Description of drawings

Hereinafter, drawings necessary to describe the embodiments of the present application or the related art will be briefly described in order to facilitate the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, the drawings of other embodiments can still be obtained according to the structures illustrated in these drawings without creative efforts.

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

Detailed ways

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

In addition, 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 that it is to be understood flexibly to include not only the numerical values expressly designated as the limits of the range, but also all individual numerical values or subranges subsumed within the stated range, as if expressly Specify each numerical value and subrange generically.

As used herein, the terms "substantially," "substantially," "substantially," and "about" are used to describe and account for small variations. When used in conjunction with an event or circumstance, the terms can refer to instances in which the event or circumstance occurs precisely as well as instances in which the event or circumstance occurs proximately. For example, when used in conjunction with a numerical value, a term may refer to a range of variation less than or equal to ±10% of the 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, if the difference between two values is less than or equal to ±10% of the mean of the values (eg, 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%), then the two values are considered to be "substantially" the same.

Also, for ease of description, "first," "second," "third," etc. may be used herein to distinguish different components. "First," "second," "third," etc. are not intended to limit corresponding components.

In the Detailed Description and the Claims, a list of items joined by the terms "at least one of," "at least one of," "at least one of," or other similar terms may mean the listed items any combination of . For example, if items A and B are listed, the phrase "at least one of A and B" means A only; B only; 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 B only; C only; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C. Item A may contain a single component or multiple components. Item B may contain a single component or multiple components. Item C may contain a single component or multiple components.

The substances used in this application can be purchased commercially 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 , and the heat generating layer 120 is disposed on the porous ceramic base 110 . The porous ceramic substrate 110 has a large number of micropores, which can absorb the smoke liquid, so as to heat and atomize the smoke liquid into smoke when the heating layer 120 is energized.

The inventor has found that the thermal conductivity of the porous ceramic substrate 110 has an important influence on the atomization efficiency of the atomizing core 100. By changing the thermal conductivity of the porous ceramic substrate 110, the heat loss of the heating layer 120 can be reduced, and the atomization of the smoke liquid can be improved. efficiency, saving the fogging time of the atomizing core 100, so that more efficient liquid-to-smoke conversion can be achieved under the same power, a faster fogging speed can be obtained, and a larger smoke volume can be achieved.

The inventor further studied and found that the penetration rate of the porous ceramic substrate 110 has an important influence on the atomization efficiency of the atomizing core 100 , and the problem of dry burning or oil leakage of the atomizing core can be solved by changing the penetration rate of the porous ceramic substrate 110 . In addition, when the penetration speed of the porous ceramic base 110 is controlled within a certain range, the penetration speed of the porous ceramic base 110 matches the heating efficiency of the heating layer 120, which can maximize the amount of smoke and provide users with a better smoking experience .

The thermal conductivity and penetration rate of the porous ceramic matrix are closely related to the material composition, pore size and porosity of the porous ceramic matrix. However, the porous ceramic substrates prepared according to the current industrial preparation methods have disadvantages such as uneven distribution of voids, low porosity, poor mechanical properties, and low production efficiency, making it difficult to achieve porous ceramic substrates with low thermal conductivity and appropriate penetration rate . To this end, the inventors combined the particle stacking method and the pore-forming agent addition method to prepare the porous ceramic matrix, so that the porous ceramic matrix has the advantages of high porosity, low thermal conductivity, controllable pore size, excellent mechanical properties, and high process stability.

The present application provides an atomizing core 100, which includes a porous ceramic base 110 and a heat generating layer 120 disposed on the porous ceramic base 110, wherein the porous ceramic base 110 includes alumina, silica, pore-forming agent and optional As a sintering aid, the weight percentage of 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, and 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). 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 and so on.

In some embodiments, the first material may include at least one of aluminum oxide, aluminum nitride, or zirconium oxide. 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 includes at least one of wood chips, graphite, carbon powder, cellulose, or starch.

In some embodiments, the sintering aid includes at least one of calcium carbonate, magnesium carbonate, talc, or sodium silicate. The sintering aid can 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 thermal conductivity of the porous ceramic matrix 110 is from about 0.4 W/mK to about 1.0 W/mK. For example, in some embodiments, the thermal conductivity of the porous ceramic matrix 110 may be 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 any two of the above The range of value composition, for example, about 0.4W/mK-about 0.8W/mK, about 0.5W/mK-about 0.7W/mK, about 0.5W/mK-about 0.8W/mK, about 0.5W/mK-about 0.85 W/mK or about 0.5W/mK to about 1.0W/mK. Since the thermal conductivity of the porous ceramic substrate 110 of the present application is relatively small, the heat generated by the heating layer 120 can be isolated from being conducted to the porous ceramic substrate 110 , thereby reducing the heat loss of the heating layer 120 .

In some embodiments, the pore size (D50) of the porous ceramic matrix 110 may be from about 15 μm to about 25 μm. For example, in some embodiments, the pore size of the porous ceramic matrix 110 can 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 can be It is a range composed of any two of the above values, for example, 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 porosity of the porous ceramic matrix 110 may be from about 30% to about 50%. For example, in some embodiments, the porous ceramic matrix 110 may have a porosity of 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 can be a range of any two of the above values, such as about 30% to about 45%, about 40% to about 45%, About 40% to about 50% or about 45% to about 50%, etc.

The particles on the surface of the porous ceramic matrix 110 may be at risk of being peeled off under the action of 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 scratch resistance of the porous ceramic matrix ranges 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 be a range of any two of the above values, such as about 0.5 wt % to about 1 wt %, about 1 wt % to about 3 wt %, or about 3 wt % to about 5 wt %, and the like. The porous ceramic substrate 110 has good scratch resistance, which can reduce or prevent the ceramic powder from falling off.

In some embodiments, the flexural strength of the porous ceramic matrix 110 may be about 6 Mpa to 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 can be the range of any two values above, such as 6Mpa-about 10Mpa, 6Mpa-about 12Mpa, 9Mpa-about 12Mpa, 10Mpa-about 12Mpa, about 9Mpa-about 13Mpa, or about 10Mpa-about 15Mpa, etc. The porous ceramic substrate 110 has a relatively large bending strength, which can meet the requirements of automated assembly, and further, can meet the requirements of the strength of the automatic gripper/suction cup and the assembly pressure requirements of the ejector pin in the cartridge.

In some embodiments, the thickness of the porous ceramic matrix 110 is about 0.5 mm to about 4 mm. In some embodiments, the thickness of the porous ceramic matrix 110 may be about 0.5 mm, about 1.0 mm, about 1.5 mm, about 2.0 mm, about 2.5 mm, about 3.0 mm, about 3.5 mm, about 4.0 mm, or may be any of the above The range of two numerical values, for example, about 0.5 mm to about 2 mm, about 1.0 mm to about 4 mm, about 1.5 mm to about 3 mm, or about 2.0 mm to about 4 mm, etc.

In some embodiments, the penetration rate of the porous ceramic matrix 110 may be from about 0.8 mg/s.bar.mm ² to about 4.0 mg/s.bar.mm ² . In this application, the permeation velocity refers to the weight of smoke liquid passing through the porous ceramic matrix per unit area (mm ² ), unit pressure (bar) and unit time (s). When the penetration speed of the porous ceramic substrate 110 is greater than 4.0 mg/s.bar.mm ² , the liquid ejaculation speed is too fast. Therefore, some e-liquid will be inhaled by the user along with the smoke in the future, resulting in an experience similar to oil leakage. . When the penetration rate of the porous ceramic matrix 110 is less than 0.8 mg/s.bar.mm ² , the flow rate of the smoke liquid in the porous ceramic matrix 110 is too slow, and a dry burning phenomenon occurs, thereby producing harmful substances such as formaldehyde. In some embodiments, the penetration rate of the porous ceramic matrix 110 may be about 0.8 mg/s.bar.mm ² , about 0.9 mg/s.bar.mm ² , about 0.96 mg/s.bar.mm ² , about 1.0 mg/s.bar.mm ² , about 1.2 mg/s.bar.mm ² , about 1.5 mg/s.bar.mm ² , about 1.8 mg/s.bar.mm ² , about 2.0 mg/s.bar. mm ² , about 2.3 mg/s.bar.mm ² , about 2.5 mg/s.bar.mm ² , about 2.8 mg/s.bar.mm ² , about 3.0 mg/s.bar.mm ² , about 3.5 mg /s.bar.mm ² , about 3.6 mg/s.bar.mm ² , about 3.8 mg/s.bar.mm ² , about 3.85 mg/s.bar.mm ² , about 4.0 mg/s.bar.mm ² or can be a range of any two of the above values, such as about 0.8 mg/s.bar.mm ² to about 2.0 mg/s.bar.mm ² , about 0.9 mg/s.bar.mm ² to about 2.5 mg/ s.bar.mm ² , about 0.96 mg/s.bar.mm ² to about 3.85 mg/s.bar.mm ² , about 1.35 mg/s.bar.mm ² to about 2.88 mg/s.bar.mm ² , about 1.54 mg/s.bar.mm ² to about 2.88 mg/s.bar.mm ² , about 1.5 mg/s.bar.mm ² to about 3.85 mg/s.bar.mm ² or 1.5 mg/s. bar.mm ² to about 3.0 mg/s.bar.mm ² .

The present application uses a combination of particle packing method and additive pore former method to prepare porous ceramic matrix 110 . Specifically, the alumina, silicon dioxide, sintering aid and pore-forming agent are uniformly mixed according to a certain weight ratio, then the mixed powder is put into a mold to form a green embryo, and the green embryo is sintered at a certain temperature to obtain Porous ceramic substrate 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 disposed on the porous ceramic base 110 by means of sputtering, transfer printing, or photolithography. When the heat-generating layer 120 is sputtered, transferred or photo-etched onto the porous ceramic base 110 , part of the heat-generating layer material will penetrate into the porous ceramic base 110 , thereby forming a physical engagement area with the porous ceramic base 110 . In some embodiments, the physical nip area has a depth of 10 μm-60 μm to improve the flexural strength of the porous ceramic matrix 110 and the peel resistance (powder drop) of the heat generating layer 120 . The heating layer 120 may include a heating wire, and the heating wire may include 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, At least one of palladium-silver alloy or gold-platinum alloy.

According to another aspect of the present application, the present application further provides an atomizer, which includes a liquid storage chamber and the atomizing core of the present application. The liquid storage chamber can contain liquid, and the atomizing core can absorb the liquid from the liquid storage chamber and atomize the liquid.

In some embodiments, the heating power of the atomizer may be 6.5W-18W. For example, in some embodiments, the heating power of the atomizer can 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 a range of any two values above, for example, about 6.5W to about 10W, about 6.5W to about 15W, or about 10W to about 18W.

According to another aspect of the present application, the present application further provides an electronic cigarette, which includes the atomizer of the present application. The e-cigarette liquid can be atomized by an atomizer to generate aerosol for users to inhale. According to the embodiments of the present application, the electronic cigarette of the present application no longer burns dry or leaks oil, and the amount of smoke can meet the needs of users, providing users with better taste and experience.

In some embodiments, the fogging time of the electronic cigarette is about 0.2s to about 0.5s. For example, in some embodiments, the fogging time of the electronic cigarette may be about 0.2s, about 0.25s, about 0.3s, about 0.35s, about 0.4s, about 0.45s, or about 0.5s or any two of the above. The range of composition is, for example, about 0.2s to about 0.4s or about 0.3s to about 0.5s. The electronic cigarette of the present application has a faster fogging speed due to the atomizing core, so that the first puff of smoke has a better experience.

In some embodiments, the useful life of the electronic cigarette may be about 500 to about 1000 puffs. In some embodiments, the service life of the electronic cigarette may be about 500, about 600, about 700, about 800, about 900, or about 1000 puffs or may be in the range of any two of the above values, such as about 500 to about 800 or about 800 - about 1000 mouthfuls. The service life of the atomizing core in this application is measured by the following method: give enough smoke liquid, take the suction volume of 55mL, suction for 3 seconds and pause for 15 seconds as a cycle, and continue to circulate until the smoke volume TPM is less than 5mg. , record the number of cycles at this time as the service life of the atomizing core. The electronic cigarette of the present application can avoid the problems of dry burning and oil leakage, maximize the amount of smoke, and have a long service life.

In some embodiments, the smoke volume (TPM) of the electronic cigarette is about 4 mg to about 6.5 mg per puff. In this application, the smoke volume of each puff is 55 mL, and the puffing time of each puff is 3 seconds. According to the statistics of the smoke demand of a large number of users, a better smoking experience can be obtained when the smoke volume is at least 4mg, and the experience is better when the smoke volume is 5mg-6.5mg. In some embodiments, the amount of smoke per puff of the electronic cigarette is about 4 mg, about 4.5 mg, about 5 mg, about 5.5 mg, about 6 mg, about 6.5 mg, or can be in the range of any two of the above values, such as about 5 mg to about 6 mg, about 5.5 mg to about 6 mg, about 4 mg to about 5 mg, or about 5 mg to about 6.5 mg, and the like.

Example

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

Preparation:

Porous ceramic matrix: the examples and comparative examples are uniformly mixed with alumina, silica sintering aid and pore-forming agent according to the ratios shown in Tables 1-1, 2-1 and 3-1 below, and then mixed well The powder is put into a mold to form a green embryo, and the green embryo is sintered at a certain temperature to obtain a porous ceramic matrix.

Atomizer: The heating wire is arranged on the prepared porous ceramic substrate to obtain the atomizing cores in each of the examples and comparative examples. The nebulizer is then combined with the reservoir chamber to prepare the nebulizer.

Electronic cigarette: Assemble the prepared atomizer with battery components, cigarette rods, etc. to prepare electronic cigarette.

testing method:

Penetration speed: The porous ceramic matrix sample is sealed and fixed at one end of the glass tube, the ceramic convex surface is facing outward, the inner diameter of the tube is 10mm, and the height of the e-liquid is 20cm; time 30 minutes from the first drop of e-liquid, and weigh the e-liquid during this process. and calculate the oil leakage rate (mg/s). The viscosity of the smoke liquid is 180Pa.s.

Scratch resistance: Select a weight of 1kg, press the porous ceramic matrix sample on 240-grit sandpaper and rub it for 15cm length, weigh the weight change of the porous ceramic matrix sample before and after friction, and calculate the change rate.

Smoke volume test: the suction volume of each mouth is 55mL, the suction time of each mouth is 3 seconds, each cycle is 3 seconds of suction and 15 seconds of pause, and every ten cycles is a test. Smoke volume per puff = total smoke volume of ten cycles/10.

Thermal conductivity: The porous ceramic substrate was tested by the hot wire method with a thermal conductivity meter, and the test temperature was 200 °C.

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

Fogging time: 1. Connect the electronic cigarette to the smoking machine, start the smoking mode for 3S and stop for 15S; 2. Use a high-speed camera to shoot at the cigarette holder, and then select the time difference from the time when the indicator light of the smoking appliance lights up to the start of smoke from the cigarette holder from the video. , as the fogging time.

The service life of the atomizing core: give enough smoke liquid, take the suction volume of 55mL, suction for 3 seconds and pause for 15 seconds as a cycle, continue to circulate until the smoke volume TPM is less than 5mg, and record the number of cycles at this time as the fog The service life of the core.

Test Results:

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

The compositions of the porous ceramic substrates of Examples 1-1 to 1-16 are 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 thickness of the porous ceramic substrates of Examples 1-1 to 1-16 was 1 mm, and the heating power was 6.5 W.

Table 1-1

Table 1-2

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

Table 1-3 shows the relationship between the pore size and porosity of the porous ceramic matrix in the electronic cigarettes of Example 1-1, Example 1-8, and Examples 1-10 to 1-16 and the permeation speed.

Table 1-3

	Pore size/μm	Porosity/%	Penetration rate/(mg/s.bar.mm 2 )
Examples 1-10	14	40	0.77

Examples 1-8	15	40	0.96
Examples 1-11	15	43	1.15
Examples 1-12	18	45	1.54
Examples 1-13	20	50	2.69
Examples 1-14	twenty two	50	2.88
Examples 1-15	twenty three	50	3.08
Example 1-1	25	50	3.85
Examples 1-16	25	53	4.04

Table 1-4 shows the relationship between the pore size and porosity of the porous ceramic substrates of Example 1-1, Example 1-8, and Examples 1-10 to 1-16, and scratch resistance and flexural strength .

Table 1-4

	Pore size/μm	Porosity/%	Scratch resistance/%	Bending strength/Mpa
Examples 1-10	14	40	2.5	9.5
Examples 1-8	15	40	3	9
Examples 1-11	15	43	3.2	8.5
Examples 1-12	18	45	3.7	8
Examples 1-13	20	50	4	7.5
Examples 1-14	twenty two	50	4.5	7
Examples 1-15	twenty three	50	4.8	6.8
Example 1-1	25	50	5	6.5
Examples 1-16	25	53	5.3	6

Table 1-5 shows the relationship between the penetration speed of the porous ceramic matrix and the amount of smoke and the temperature of the heating wire in the electronic cigarettes of Example 1-1, Example 1-8 and Examples 1-10 to 1-16, and the lifespan of e-cigarettes.

Table 1-5

It can be known from Tables 1-1 to 1-5 that when the weight ratio of alumina, silica, sintering aid and pore-forming agent in the porous ceramic matrix is (5-20):(55-70):( 1-8): (10-20), when 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, the penetration rate of the porous ceramic matrix is 0.8mg/s.bar.mm ² -4.0mg/s.bar.mm ² , so that the atomizing core can have a fogging time of 0.2s-0.5s and 4.5mg-6.5mg amount of smoke. It can be seen that the first group of atomizing cores can achieve a faster fogging speed and a larger amount of smoke, thereby improving the user's smoking experience.

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

The compositions of the porous ceramic substrates of Examples 2-1 to 2-10 are 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 thickness of the porous ceramic substrates of Examples 2-1 to 2-10 was 2 mm, and the heating power was 9 W.

table 2-1

Table 2-2

	Pore size/μm	Porosity/%	Thermal conductivity/(W/mK)	Fog time/s
Example 2-1	25	50	0.5	0.3
Example 2-2	twenty three	50	0.6	0.35
Example 2-3	20	50	0.75	0.4
Example 2-4	20	40	0.9	0.45
Example 2-5	20	30	1	0.5
Examples 2-6	15	30	1.2	0.55

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

Table 2-3

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

Table 2-4 shows the relationship between the pore size and porosity of the porous ceramic substrates of Example 2-1, Examples 2-7 to 2-10, and scratch resistance and flexural strength.

Table 2-4

	Pore size/μm	Porosity/%	Scratch resistance/%	Bending strength/Mpa
Example 2-1	25	50	1	7
Example 2-7	twenty two	50	0.9	7.5
Examples 2-8	twenty two	48	0.8	7.8
Examples 2-9	20	48	0.7	8
Examples 2-10	20	40	0.5	10

Table 2-5 shows the relationship between the penetration rate of the porous ceramic matrix in the electronic cigarettes of Example 2-1 and Examples 2-7 to 2-10, the amount of smoke and the temperature of the heating element, and the service life of the electronic cigarette.

Table 2-5

It can be known from Tables 2-1 to 2-5 that when the weight ratio of alumina, silica, sintering aid and pore-forming agent in the porous ceramic matrix is (20-30):(40-50):( 5-10): (10-20), when 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, the penetration rate of the porous ceramic matrix is 1.5mg/s.bar.mm ² -3.85mg/s.bar.mm ² , so that the atomizing core can have a fogging time of 0.3s-0.5s and 5.5mg-6.5mg amount of smoke. Therefore, the second group of atomizing cores can also achieve faster fogging speed and higher smoke volume.

3. Comparative example: The weight ratio of alumina, silica, sintering aid and pore-forming agent in the porous ceramic matrix is (35-50):(30-50):(7-15):(5-10 ).

The compositions of the porous ceramic substrates of Comparative Examples 3-1 to 3-4 are shown in Table 3-1. Table 3-2 shows the pore size, porosity, thermal conductivity, fogging time, scratch resistance, smoke amount, and heating wire temperature of the porous ceramic matrix in the atomizing cores of Comparative Examples 3-1 to 3-4. Relationship. The thickness of the porous ceramic substrates of Comparative Examples 3-1 to 3-4 was 1 mm, and the heating power was 6.5 W.

Table 3-1

Table 3-2

By comparing the first set of examples (Examples 1-1 to 1-16), the second set of examples (Examples 2-1 to 2-10) and the third set of comparative examples (Comparative Examples 3-1 to 3- 4) It can be seen that when the porous ceramic matrix includes 5%-30% by weight of alumina, the scratch resistance of the porous ceramic matrix is greatly improved, and the porous ceramic matrix achieves a larger amount of smoke and a relatively low smog. Small fogging time and long service life.

Reference throughout the specification to "some embodiments," "some embodiments," "one embodiment," "another example," "example," "specific example," or "partial example" means that At least one embodiment or example in this application incorporates a particular feature, structure, material or characteristic described in the embodiment or example. Thus, descriptions such as: "in some embodiments", "in an embodiment", "in one embodiment", "in another example", "in an example", appearing in various places throughout the specification "in", "in a particular example" or "by way of example", which are not necessarily referring to the same embodiment or example in this application. Furthermore, the particular features, structures, materials or characteristics herein may be combined in any suitable manner in one or more embodiments or examples.

Although illustrative embodiments have been shown and described, it should be understood by those skilled in the art that the above-described embodiments are not to be construed as limitations of the application, and changes may be made in the embodiments without departing from the spirit, principles and scope of the application , alternatives and modifications.

Claims (18)

1. An atomizing core, comprising:

   a porous ceramic substrate; and

   a heat generating layer, which 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 includes at least one of alumina, aluminum nitride or zirconia, and the second material includes at least one of silicon dioxide, calcium oxide, magnesium oxide, silicon nitride or silicon carbide.
2. The atomizing core according to claim 1, wherein the weight ratio of the first material, the second material, the sintering aid and the pore-forming agent 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-forming agent comprises at least one of wood chips, graphite, carbon powder, cellulose, or starch.
4. The atomizing core according to claim 1, wherein the sintering aid comprises at least one of calcium carbonate, magnesium carbonate, talc or sodium silicate.
5. The atomizing core according to claim 1, wherein the thermal conductivity of the porous ceramic matrix is 0.4W/mK-1.0W/mK.
6. The atomizing core according to claim 1, wherein the pore diameter of the porous ceramic matrix is 15 μm-25 μm.
7. The atomizing core of claim 1, wherein the porous ceramic matrix has a porosity of 30%-50%.
8. The atomizing core according to claim 1, wherein the scratch resistance of the porous ceramic matrix is in the range of 0.5wt% to 5wt%
9. The atomizing core according to claim 1, wherein the flexural strength of the porous ceramic matrix is 6Mpa-15Mpa.
10. The atomizing core according to claim 1, wherein the thickness of the porous ceramic matrix is 0.5mm-4mm.
11. The atomizing core according to claim 1, wherein the penetration rate of the porous ceramic matrix is 0.8 mg/s.bar.mm ² to 4.0 mg/s.bar.mm ² .
12. The atomizing core according to claim 1, wherein the heating layer comprises a heating wire, and the heating wire comprises iron, aluminum, platinum, palladium, iron-aluminum alloy, iron-nickel alloy, iron-chromium-aluminum alloy, iron-chromium alloy, At least one of palladium-copper alloy, gold-silver-platinum alloy, gold-silver alloy, palladium-silver alloy or gold-platinum alloy.
13. An atomizer comprising:

    a liquid storage chamber for containing liquid; and

    The atomizing core according to any one of claims 1 to 12, which absorbs liquid from the liquid storage cavity and atomizes the liquid.
14. The nebulizer of claim 13, wherein the liquid has a viscosity of 120 mPa.s to 200 mPa.s.
15. The atomizer according to claim 13, wherein the heating power of the atomizer is 6.5W-18W.
16. An electronic cigarette comprising the atomizer according to any one of claims 13 to 15.
17. The electronic cigarette according to claim 16, wherein the fogging time of the electronic cigarette is 0.2s-0.5s.
18. The electronic cigarette according to claim 16, wherein the smoke amount of the electronic cigarette is 4mg-6.5mg per puff.

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