Multi-pore-size porous ceramic substrate and atomization core

Abstract

Disclosed in the present invention are a multi-pore-size porous ceramic substrate and atomization core. The multi-pore-size porous ceramic substrate is composed of a plurality of groups of ceramic sheet layers that are stacked one on top of the other and sintered into one piece, wherein each group of ceramic sheet layers comprises one or more ceramic sheet layers; bubble-shaped micropores are evenly distributed in each ceramic sheet layer; micropores in different ceramic sheet layers of the same group have the same average pore size, and micropores in ceramic sheet layers of different groups have different average pore sizes; and according to the sequence from bottom to top, the average pore sizes of the micropores in the groups of ceramic sheets follow a pattern of alternating changes in size between large and small or gradient changes in size from large to small. The atomization core is provided with an electrode layer and a metal heating layer on an atomization surface of the multi-pore-size porous ceramic substrate. The beneficial effects are: the multi-pore-size porous ceramic substrate has a multi-ceramic-sheet-layer structure, the micropores in the sheet layers form a structure with alternating changes or gradient changes in pore size, thus having the functions of transition and buffering for the transmission of an atomization liquid; and liquid supply and atomization are balanced, thereby improving the atomization experience.

Description

Porous ceramic substrate with multiple pore sizes and atomizing core thereof Technical Field

[0001] The present invention belongs to the technical field of atomizing cores of electronic cigarette atomizers, and in particular relates to a porous ceramic substrate with multiple pore sizes and an atomizing core thereof. Background Art

[0002] The atomizing core of the electronic atomizer is used to heat the liquid to be atomized, i.e., the atomizing liquid, and atomize it into an aerosol or vapor, mist or smoke for the user to inhale. The atomizing liquid can be a cigarette liquid or a solution containing medicine for health and medical purposes. The electronic atomizer can be used for electronic cigarettes.

[0003] The atomizer core of current electronic atomizers includes a porous ceramic substrate as a liquid guide, and then a heating element such as a heating wire, heating sheet, or heating film is attached to the liquid guide. When the heating element is energized, it can be used to heat the atomized liquid on the liquid guide and atomize it into an aerosol, vapor, mist, or smoke. Existing porous ceramic substrates used as liquid guides are mainly formed into a ceramic green body in one step and sintered. The micropore structure within the ceramic green body is simple, with similar pore sizes. The liquid guide or liquid supply speed is single, which does not match the requirement of the heating element to consume atomized liquid at different power levels. This leads to an imbalance between liquid supply and atomization, causing the atomizer core of the electronic atomizer to easily suffer from problems such as dry burning and carbon deposition due to insufficient liquid supply during the atomization process, as well as oil explosion and leakage due to excessive liquid supply. Technical issues

[0004] In view of the shortcomings of the prior art, the technical problem solved by the present invention is to overcome the deficiencies of the prior art and provide a porous ceramic substrate with multiple pore sizes and an atomizing core thereof. Technical Solutions

[0005] The technical solution of the present invention is a porous ceramic matrix with multiple pores, which is composed of several groups of ceramic layers stacked up and down and sintered into one. Each group of ceramic layers includes 1 to several layers of ceramic layers, and each layer of the ceramic layers has bubble-shaped micropores evenly distributed. The average pore size of the micropores in the ceramic layers of different layers in the same group is the same, and the average pore size of the micropores in the ceramic layers of different groups is different. The several groups of ceramic layers are arranged in a bottom-up order, and the average pore size of the micropores in each group of ceramic layers has a rule of alternating size or gradient change from large to small, wherein the average pore size of the micropores in each layer of the ceramic layers is 10 to 80um, the porosity of the micropores is 35%-65%, and the thickness of each layer of the ceramic layers is 0.1 to 1mm.

[0006] Preferably, the ceramic sheets include 2 to 10 groups, and each group of the ceramic sheets includes 1 to 5 ceramic sheets.

[0007] Preferably, the ceramic sheets include 2 to 5 groups, and each group of the ceramic sheets includes 1 to 3 ceramic sheets.

[0008] Preferably, the ceramic sheets are in 3 or 4 groups, and each group of the ceramic sheets has 2 ceramic sheets.

[0009] Preferably, the ceramic sheets have 4 groups, each group of the ceramic sheets has 1 ceramic sheet, wherein in the order of stacking from bottom to top, the average pore size of the micropores in each layer of ceramic sheets has a gradient change from large to small, wherein the pore size of the micropores in the first layer of ceramic sheets is 40 to 50 um, the pore size of the micropores in the second layer of ceramic sheets is 30 to 40 um, the pore size of the micropores in the third layer of ceramic sheets is 20 to 30 um, and the pore size of the micropores in the fourth layer of ceramic sheets is 10 to 20 um.

[0010] Preferably, the ceramic sheets have 4 groups, each group of the ceramic sheets has 1 ceramic sheet, wherein the average pore size of the micropores in each layer of ceramic sheets has a pattern of alternating size in the order of stacking from bottom to top, wherein the pore size of the micropores in the first layer of ceramic sheets is 40 to 50 um, the pore size of the micropores in the second layer of ceramic sheets is 30 to 40 um, the pore size of the micropores in the third layer of ceramic sheets is 40 to 50 um, and the pore size of the micropores in the fourth layer of ceramic sheets is 10 to 20 um.

[0011] Preferably, the ceramic layers have 3 groups, each group of the ceramic layers has 2 ceramic layers, and the total number of layers is 6 layers. Among them, in order from bottom to top, the average pore size of the micropores in each layer of ceramic layers has a gradient change from large to small, among which the pore size of the micropores in the first group of ceramic layers is 35~50um, the pore size of the micropores in the second group of ceramic layers is 20~35um, and the pore size of the micropores in the third group of ceramic layers is 10~20um.

[0012] Preferably, there are 4 groups of ceramic sheets, each group of ceramic sheets has 2 ceramic sheets, and the total number of sheets is 8. The average pore size of the micropores in each layer of ceramic sheets has a gradient change from large to small in order from bottom to top, wherein the pore size of the micropores in the first group of ceramic sheets is 40-50um, the pore size of the micropores in the second group of ceramic sheets is 30-40um, the pore size of the micropores in the third group of ceramic sheets is 20-30um, and the pore size of the micropores in the fourth group of ceramic sheets is 10-20um.

[0013] Another technical solution of the present invention is a multi-pore porous ceramic atomization core, comprising the multi-pore porous ceramic substrate as described above, wherein one of the upper and lower surfaces of the multi-pore porous ceramic substrate is set as an atomization surface, and the other surface is set as a liquid guide surface, electrode layers are respectively provided at both ends of the atomization surface, and a metal heating layer is also provided on the atomization surface, and the metal heating layer is electrically connected to the electrode layer.

[0014] Preferably, the upper and lower surfaces of the porous ceramic substrate with multiple pores are selected so as to have smaller pore diameters as the atomizing surface, and the other surface is selected so as to have a liquid guiding surface. Beneficial effects

[0015] Different from the existing porous ceramics with a single pore structure, the porous ceramic matrix of the present invention has a multi-group multi-layer ceramic sheet structure. The pore size of the micropores in each group or layer of ceramic sheets is different. According to the order of stacking the ceramic sheets from bottom to top, the pore size of the micropores in each ceramic sheet can change alternately in size or change in a gradient from large to small. There will be an interlayer interface between the ceramic sheets at the microscopic level. The pore size of the micropores at the interlayer interface is between the pore sizes of the two layers of micropores, which has a certain transition and buffering effect on the transmission of the atomized liquid, which is beneficial to the storage and transmission of the atomized liquid. In addition, the stacking method of multi-layer ceramic sheets with multiple pores can be applied to the atomization core of electronic cigarettes. The atomization core can adjust the pore size structure of the ceramic micropores according to the ceramic sheets according to different heating methods and different viscosities of the smoke liquid. The porosity and pore size from the liquid guide surface to the atomization surface are adjusted layer by layer, so that the liquid supply and atomization of the porous ceramic matrix are balanced, achieving the advantages of both fast liquid guide and fine atomization, and improving the atomization experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a cross-sectional view of a porous ceramic substrate with multiple pore sizes according to a first embodiment of the present invention;

[0017] FIG2 is a cross-sectional view of a porous ceramic substrate with multiple pore sizes according to a second embodiment of the present invention;

[0018] FIG3 is a cross-sectional view of a porous ceramic substrate with multiple pore sizes according to a third embodiment of the present invention;

[0019] FIG4 is a cross-sectional view of a porous ceramic substrate with multiple pore sizes according to a fourth embodiment of the present invention;

[0020] FIG5 is an exploded perspective view of a porous ceramic atomizing core with multiple apertures according to embodiments five and six of the present invention;

[0021] FIG6 is an inverted exploded perspective view of the porous ceramic atomizing core with multiple apertures according to the fifth and sixth embodiments of the present invention. Best Mode for Carrying Out the Invention

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] To facilitate description and better illustrate the present invention and its embodiments, terms or descriptions indicating directions or positions, such as "upper," "lower," "upright," and "inverted," herein refer to the orientation or position of the devices or components in the accompanying drawings and are not intended to limit the devices, components, or parts indicated to a specific orientation, or to their construction and operation in a specific orientation. In the event of a change in orientation or position, the above-mentioned directional terms will also change accordingly. Furthermore, terms such as "first," "second," etc., are primarily used to distinguish different devices, components, or parts and are not intended to indicate or imply the relative importance, absolute order, or quantity of the devices, components, or parts indicated. A porous ceramic matrix with multiple pores is composed of several groups of ceramic sheets, such as 2 to 10 groups of ceramic sheets, stacked and sintered together. Each group of ceramic sheets includes one to several layers, such as one to five layers. Each layer of ceramic sheets has bubble-like micropores evenly distributed therein. The average pore size of the micropores in different layers of the same group is the same, while the average pore size of the micropores in different groups of ceramic sheets is different. The average pore size of the micropores in each group of ceramic sheets, arranged from bottom to top, varies in size or in a gradient from large to small. The micropores are spherical or nearly spherical bubble-like micropores, which are closely spaced. Some adjacent micropores are connected by tiny through-holes. Therefore, the entire porous ceramic matrix with multiple pores can be used as a liquid conductor, for absorbing liquid substances from one side and conducting them to the other side after adsorption, penetration, and flow through the micropores.

[0024] In addition, the above-mentioned several groups of ceramic sheets are arranged in a bottom-up order, and the average pore size of the micropores in each group of ceramic sheets has a pattern of alternating size or gradient change from large to small. In other embodiments, the order of arrangement when stacking the ceramic green sheets is based on the average particle size of the aggregate and / or pore-forming agent, that is, based on the average particle size of the aggregate and / or pore-forming agent in the ceramic green sheets, and can also be arranged from small to large, or two large and one small, or two small and one large, or the same size and then alternating in size, so that the size of the micropores of each layer of ceramic sheets after production is also arranged according to the above pattern.

[0025] The multi-aperture porous ceramic substrate of the present invention has an average pore size of 10 to 80 μm within each ceramic layer, a porosity of 35% to 65%, and a thickness of 0.1 to 1 mm within each ceramic layer. The above-described micropore diameters and ceramic layer thickness structure ensure that the multi-aperture porous ceramic substrate has good conductivity for conducting liquid substances under external forces such as suction, while also preventing excessive flow and maintaining a certain balance. In the absence of external forces such as suction, the micropores have a certain tension, allowing them to absorb and hold liquid substances without causing them to naturally flow and seep out, resulting in dripping. The multi-aperture porous ceramic substrate of the present invention can be used as a liquid conductor for conducting atomized liquids.

[0026] In the present invention, the average pore size of the micropores of each ceramic layer in the above-mentioned porous ceramic matrix with multiple pores is 10 to 80 um, which means but is not limited to any value between 10 and 80 um, and\or 10 to 20 um, and\or 20 to 30 um, and\or 30 to 40 um, and\or 40 to 50 um, and\or 50 to 60 um, and\or 60 to 70 um, and\or 70 to 80 um, and\or 15 to 45 um, and\or 20 to 40 um, and\or 35 to 65 um, and\or 55 to 80 um.

[0027] The porosity of the micropores of each ceramic layer of the porous ceramic matrix with multiple pore sizes is 35%-65%, which means but is not limited to any value between 35%-65%, and\or 35%-40%, and\or 40%-45%, and\or 45%-50%, and\or 50%-55%, and\or 55%-60%, and\or 60%-65%, and\or 45-60%, and\or 48-56%.

[0028] The thickness of each ceramic layer of the porous ceramic matrix with multiple pores is 0.1 to 1 mm, which means but is not limited to any value between 0.1 and 1 mm, and\ or 0.1 mm, and\ or 0.2 mm, and\ or 0.3 mm, and\ or 0.4 mm, and\ or 0.5 mm, and\ or 0.6 mm, and\ or 0.7 mm, and\ or 0.8 mm, and\ or 0.9 mm, and\ or 1 mm, and\ or 0.1 to 0.25 mm, and or 0.2 to 0.4 mm, and or 0.25 to 0.5 mm, and or 0.5 to 0.65 mm, and or 0.65 to 0.8 mm, and or 0.8 to 1 mm.

[0029] The overall thickness of the porous ceramic substrate with multiple pore sizes in the embodiment of the present invention is generally between 1 and 8 mm.

[0030] In order to obtain a multi-layer porous ceramic matrix with the above-mentioned parameters, the multi-layer porous ceramic matrix of the present invention is manufactured by stacking 1 to several layers, for example 1 to 5 layers, of the same lamellar ceramic green embryos into a group of ceramic green embryos, and then stacking several groups, for example 2 to 10 groups, of ceramic green embryos into a whole and then debinding and sintering to obtain a multi-layer porous ceramic matrix. After sintering, one layer of the ceramic green embryos constitutes one layer of the ceramic layer.

[0031] The above-mentioned ceramic green body is made by a tape-casting process using a tape-casting ceramic slurry. The components of the tape-cast ceramic slurry include, by weight, 40 to 65 parts of ceramic powder, 30 to 50 parts of solvent, 0.1 to 3 parts of slurry dispersant, 1 to 8 parts of plasticizer and 1 to 10 parts of binder. The components of the ceramic powder include, by weight, 25 to 55 parts of aggregate, 5 to 40 parts of pore-forming agent, 5 to 19 parts of sintering aid and 5 to 35 parts of powder dispersant. The average particle size of the aggregate and pore-forming agent contained in different layers of the ceramic green bodies in the same group is the same, and the average particle size of the aggregate and / or pore-forming agent contained in different groups of ceramic green bodies is different. The average particle sizes of the aggregate and / or pore-forming agent contained in each group of ceramic green bodies are selected to be different, including selecting different average particle sizes of the aggregate, different average particle sizes of the pore-forming agent, or different average particle sizes of both the aggregate and the pore-forming agent. Such selection is intended to result in different micropore diameters within different groups of ceramic sheets formed after sintering the different groups of ceramic green bodies.

[0032] Aggregate, the primary material forming the skeleton of the multi-layered porous ceramic matrix, includes at least one of kaolin, diatomaceous earth, alumina, silicon nitride, silicon carbide, quartz sand, glass sand, clay, feldspar powder, fused quartz, cordierite, and mullite. In the present invention, due to the need to create micropores within the ceramic matrix, certain requirements are placed on the aggregate particle size, with an average particle size of 5 to 100 μm being selected.

[0033] The pore-forming agent is a material that vaporizes and evaporates during sintering to form micropores within the porous ceramic matrix. It can include at least one of graphite, starch, wood flour, flour, soy flour, polystyrene microspheres, polymethyl methacrylate microspheres, sucrose, and fiber. In the present invention, the particle size of the pore-forming agent is also required to produce micropores within the ceramic matrix. The average particle size of the pore-forming agent is preferably 5 to 100 μm.

[0034] Different from the existing porous ceramics with a single pore structure, the porous ceramic matrix of the present invention has a multi-group multi-layer ceramic sheet structure. The pore size of the micropores in each group or layer of ceramic sheets is different. According to the order of stacking the ceramic sheets from bottom to top, the pore size of the micropores in each ceramic sheet can change alternately in size or change in a gradient from large to small. There will be an interlayer interface between the ceramic sheets at the microscopic level. The pore size of the micropores at the interlayer interface is between the pore sizes of the two layers of micropores, which has a certain transition and buffering effect on the transmission of the atomized liquid, which is beneficial to the storage and transmission of the atomized liquid. In addition, the stacking method of multi-layer ceramic sheets with multiple pores can be applied to the atomization core of electronic cigarettes. The atomization core can adjust the pore size structure of the ceramic micropores according to the ceramic sheets according to different heating methods and different viscosities of the smoke liquid. The porosity and pore size from the liquid guide surface to the atomization surface are adjusted layer by layer, so that the liquid supply and atomization of the porous ceramic matrix are balanced, achieving the advantages of both fast liquid guide and fine atomization, and improving the atomization experience.

[0035] It should be noted that during the manufacture of the multi-layered porous ceramic substrate of the present invention, due to the stacking and pressing of the ceramic green sheets, the thickness of each layer of the ceramic green sheets will be slightly greater than the thickness of each layer of the ceramic sheets after sintering. The multi-layered porous ceramic substrate after sintering is actually a whole, and no obvious stratification can be seen from the appearance and cross-section, which is generally difficult to distinguish with the naked eye. The number of groups and the layer-by-layer analysis of the ceramic sheets described in this article are simply grouping and stratification based on the size of the micropores inside each group and each layer of the ceramic sheets. Modes for Carrying Out the Invention

[0036] The present invention will be described in detail below through specific examples. Example 1

[0037] As shown in Figure 1, a porous ceramic substrate 10 with multiple pores of the present invention is composed of four groups of ceramic layers stacked up and down and sintered into one. The four groups of ceramic layers include, in order from bottom to top, a first group of ceramic layers 110, a second group of ceramic layers 120, a third group of ceramic layers 130, and a fourth group of ceramic layers 140. Each group of ceramic layers is composed of one layer of ceramic layers 100, and each layer of ceramic layers 100 is uniformly distributed with bubble-shaped micropores (not shown in the figure). The average pore size of the micropores in each group or layer of ceramic layers is different. The average pore size of the micropores in each group of ceramic layers has a gradient change from large to small in the four groups of ceramic layers in order from bottom to top, that is, from the first group of ceramic layers 110 to the fourth group of ceramic layers 140, the average pore size of the micropores in each group of ceramic layers has a gradient change from large to small. In order of stacking from bottom to top, the micropores in the first group of ceramic sheets 110 have a diameter of 40-50 μm, the micropores in the second group of ceramic sheets 120 have a diameter of 30-40 μm, the micropores in the third group of ceramic sheets 130 have a diameter of 20-30 μm, and the micropores in the fourth group of ceramic sheets 140 have a diameter of 10-20 μm. In Figure 1, denser shaded areas represent smaller pores, while looser shaded areas represent larger pores.

[0038] In the porous ceramic substrate with multiple pores in this embodiment, the porosity of micropores in each ceramic layer is 40%-65%, and the thickness of each ceramic layer is 0.5 mm. Example 2

[0039] As shown in Figure 2, a porous ceramic substrate 20 with multiple pores of the present invention is composed of four groups of ceramic layers stacked up and down and sintered into one, the four groups of ceramic layers including a first group of ceramic layers 210, a second group of ceramic layers 220, a third group of ceramic layers 230, and a fourth group of ceramic layers 240. Each group of ceramic layers is composed of one layer of ceramic layers 210, or 220, or 230, or 240, and each layer of ceramic layers is uniformly distributed with bubble-shaped micropores (not shown in the figure), wherein the average pore size of the micropores in each group of ceramic layers is different. The four groups of ceramic layers are arranged in a bottom-up order, and the average pore size of the micropores in each group of ceramic layers has a pattern of alternating size changes, that is, from the first group of ceramic layers 210 to the fourth group of ceramic layers 240, the average pore size of the micropores in each group of ceramic layers has a pattern of alternating size changes. In order of stacking from bottom to top, the micropores in the first group of ceramic sheets 210 have a diameter of 40-50 μm, the micropores in the second group of ceramic sheets 220 have a diameter of 30-40 μm, the micropores in the third group of ceramic sheets 230 have a diameter of 40-50 μm, and the micropores in the fourth group of ceramic sheets 240 have a diameter of 10-20 μm. In Figure 2, denser shaded areas represent smaller pores, while looser shaded areas represent larger pores.

[0040] In the porous ceramic substrate with multiple pores in this embodiment, the porosity of micropores in each ceramic layer is 40%-65%, and the thickness of each ceramic layer is 0.5 mm. Example 3

[0041] As shown in Figure 3, a porous ceramic matrix 30 with multiple pores in this embodiment is composed of three groups of ceramic sheets 310, 320, and 330 stacked up and sintered into one. Each group of ceramic sheets includes two layers of ceramic sheets 300. Bubble-shaped micropores are evenly distributed in each layer of ceramic sheets 300. The average pore size of the micropores in different layers of the same group is the same, and the average pore size of the micropores in different groups of ceramic sheets is different. The three groups of ceramic sheets are arranged in a bottom-up order, and the average pore size of the micropores in each group of ceramic sheets has a gradient change from large to small.

[0042] That is, there are three groups of ceramic layers: a first group of ceramic layers 310, a second group of ceramic layers 320, and a third group of ceramic layers 330. Each group of ceramic layers has two ceramic layers 300, for a total of six layers. From bottom to top, the micropores in the first group of ceramic layers 310 have a diameter of 35 to 50 μm, the micropores in the second group of ceramic layers 320 have a diameter of 20 to 35 μm, and the micropores in the third group of ceramic layers 330 have a diameter of 10 to 20 μm. In Figure 3, denser shaded lines represent smaller pores, while looser shaded lines represent larger pores.

[0043] In the porous ceramic substrate with multiple pores in this embodiment, the porosity of micropores in each ceramic layer is 40%-65%, and the thickness of each ceramic layer is 0.35 mm. Example 4

[0044] As shown in Figure 4, a porous ceramic matrix 40 with multiple pores in this embodiment is composed of four groups of ceramic layers 410, 420, 430, and 440 stacked up and sintered into one. Each group of ceramic layers includes two layers of ceramic layers 400. Bubble-shaped micropores are evenly distributed in each layer of ceramic layers 400. The average pore size of the micropores in the same group of ceramic layers is the same, and the average pore size of the micropores in different groups of ceramic layers is different. The four groups of ceramic layers are arranged in a bottom-up order, and the average pore size of the micropores in each group of ceramic layers has a gradient change from large to small.

[0045] That is, the porous ceramic substrate 40 of the present invention has four groups of ceramic layers, including a first group of ceramic layers 410, a second group of ceramic layers 420, a third group of ceramic layers 430, and a fourth group of ceramic layers 440. Each group of ceramic layers has two ceramic layers 400, for a total of eight layers. From bottom to top, the micropores in the first group of ceramic layers 410 have a diameter of 40 to 50 μm, the micropores in the second group of ceramic layers 420 have a diameter of 30 to 40 μm, the micropores in the third group of ceramic layers 430 have a diameter of 20 to 30 μm, and the micropores in the fourth group of ceramic layers 440 have a diameter of 10 to 20 μm. In FIG. 4 , denser shaded lines represent smaller pores, while looser shaded lines represent larger pores.

[0046] In the porous ceramic substrate with multiple pores in this embodiment, the porosity of micropores in each ceramic layer is 40%-65%, and the thickness of each ceramic layer is 0.25 mm. Example 5

[0047] As shown in Figures 5 and 6, this embodiment provides a multi-pore porous ceramic atomizing core, which includes a multi-pore porous ceramic substrate 50 that can be used as a liquid guide for the atomizing core. First, on the basis of the multi-pore porous ceramic substrate 50 of the above embodiment, one of the upper and lower surfaces of the multi-pore porous ceramic substrate is selected as the atomizing surface 51, and the other surface is used as the liquid guide surface 52. Electrode layers 53 are provided at both ends of the atomizing surface 51. The electrode layer is printed on both ends of the atomizing surface 51 by screen printing of metal slurry and sintered to obtain the electrode layer 53. A metal heating layer 54 is also provided on the atomizing surface 51. The metal heating layer 54 is obtained by a metal sputtering coating process or by a process of screen printing another metal slurry and then sintering. The metal heating layer 54 is covered on the electrode layer 53 so that the two can be electrically connected. Both the upper and lower surfaces of the porous ceramic matrix with multiple pores can be used as liquid guiding surfaces for introducing liquid substances, and the other surface is used as an atomizing surface for seeping out liquid substances. The metal heating layer 54 also has micropores or large through holes, so that the liquid substance seeping out of the atomizing surface 51 can continue to seep out through the metal heating layer, or provide gaseous substances for volatilization into the air. When the metal heating layer 54 is energized and heated, it can heat, evaporate or atomize the liquid substance seeping out of the atomizing surface 51 to form an aerosol or aerosol, or smoke. The electrode layer 53 is used to connect the two poles of the power supply to provide electrical energy for the metal heating layer 54.

[0048] The multi-aperture porous ceramic atomizing core of the present invention, in which the multi-aperture porous ceramic matrix 50 serving as a liquid conductor, has bubble-shaped micropores uniformly distributed within each ceramic layer. The average pore size of the micropores within the same group of ceramic layers is the same, while the average pore size of the micropores within different groups of ceramic layers is different. The average pore size of the micropores within each group of ceramic layers, in a bottom-up order, has a pattern of alternating size changes or a gradient change from large to small. The micropores are spherical or nearly spherical bubble-shaped micropores, the distance between the micropores is relatively close, and some adjacent micropores are connected by tiny through-holes. Therefore, the entire multi-aperture porous ceramic matrix can serve as a liquid conductor, used to absorb liquid substances from one side and conduct them to the other side after adsorption, penetration, and flow through the micropores. The multi-aperture porous ceramic atomizer core of the present invention has the aforementioned micropore diameter and ceramic layer thickness structure, which ensures that the multi-aperture porous ceramic matrix has good conductivity for conducting liquid substances under external forces such as suction, while preventing excessive flow and maintaining a certain balance. In the absence of external forces such as suction, the micropores have a certain tension, which allows for rapid absorption of liquid substances without causing natural flow and leakage. The multi-aperture porous ceramic atomizer core of the present invention can be used in electronic cigarette atomizers to heat, evaporate, and atomize atomized liquid or electronic cigarette liquid within the electronic cigarette liquid storage chamber.

[0049] The porous ceramic matrix of the present invention has a multi-layer ceramic sheet structure with multiple groups and multiple layers. The pore size of the micropores in each group or layer of ceramic sheets is different. According to the order of stacking the ceramic sheets from bottom to top, the pore size of the micropores in each ceramic sheet can change alternately in size or change in a gradient from large to small. There will be an interlayer interface between the ceramic sheets at the microscopic level. The pore size of the micropores at the interlayer interface is between the pore sizes of the two layers of micropores, which has a certain transition and buffering effect on the transmission of the atomized liquid, which is beneficial to the storage and transmission of the atomized liquid. In addition, the stacking method of the multi-layer ceramic sheets with multiple pores can be applied to the atomization core of the electronic cigarette. The atomization core can adjust the pore size structure of the ceramic micropores according to the ceramic sheets according to different heating methods and different viscosities of the smoke liquid. The porosity and pore size from the liquid guide surface to the atomization surface are adjusted layer by layer, so that the liquid supply and atomization of the porous ceramic matrix are balanced, achieving the advantages of both fast liquid guide and fine atomization, and improving the atomization experience.

[0050] Figure 5 of the accompanying drawings in this specification shows an upright, exploded perspective view of the multi-layered porous ceramic atomizer core of this embodiment, and Figure 6 shows an inverted, exploded perspective view of the multi-layered porous ceramic atomizer core of this embodiment. In actual use, the multi-layered porous ceramic atomizer core of the present invention is generally installed in the position shown in Figure 6 so that the atomized liquid can flow from top to bottom by gravity and be conducted to the metal heating layer. The position shown in Figure 5 is for the convenience of showing the electrode layer and metal heating layer in the exploded structure. Example 6

[0051] As shown in Figures 5 and 6, the multi-pore porous ceramic atomizing core of the present invention is first based on the multi-pore porous ceramic substrate 50 in the above embodiment. The side with smaller pore size of the micropores is selected from the upper and lower surfaces of the multi-pore porous ceramic substrate to be set as the atomizing surface 51, and the other side is set as the liquid guide surface 52. Electrode layers 53 are provided at both ends of the atomizing surface 51. The electrode layer is printed by screen printing a metal slurry on both ends of the atomizing surface 51 and sintered to obtain the electrode layer 53. A metal heating layer 54 is also provided on the atomizing surface 51. The metal heating layer 54 is obtained by a metal sputtering coating process or by screen printing another metal slurry and then sintering. In this embodiment, the side with a smaller pore size of the micropores is selected as the atomizing surface 51, and the other side is set as the liquid guiding surface 52, so that the atomized liquid is more easily absorbed by the liquid guiding surface. When it reaches the atomizing surface, due to the smaller micropore size, the seepage rate of the atomized liquid can be controlled, so that the liquid supply and atomization speeds are matched to better achieve a dynamic balance, thereby achieving the advantages of both fast liquid guiding and fine atomization, and improving the atomization experience of electronic cigarette atomizer users. Industrial Applicability

[0052] The above descriptions are merely preferred embodiments of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.

Claims

1. A porous ceramic matrix with multiple apertures, characterized in that It is composed of several groups of ceramic sheet layers that are stacked up and down and sintered into one body. Each group of the ceramic sheet layers includes 1 to several layers of ceramic sheet layers. Bubbly micropores are evenly distributed in each layer of the ceramic sheet layers. The average pore diameters of the micropores in the ceramic sheet layers of the same group and different layers are the same, while the average pore diameters of the micropores in the ceramic sheet layers of different groups are different. In the order from bottom to top of the several groups of ceramic sheet layers, the average pore diameters of the micropores in the ceramic sheet layers of each group have a pattern of alternating large and small changes or gradient changes from large to small. Among them, the average pore diameter of the micropores in each layer of the ceramic sheet layers is 10 to 80 um, the porosity of the micropores is 35% - 65%, and the thickness of each layer of the ceramic sheet layers is 0.1 to 1 mm.

2. The porous ceramic matrix with multiple apertures according to claim 1, characterized in that, There are 2 to 10 groups of the ceramic sheet layers, and each group of the ceramic sheet layers has 1 to 5 layers of ceramic sheet layers.

3. The porous ceramic matrix with multiple apertures according to claim 2, characterized in that, There are 2 to 5 groups of the ceramic sheet layers, and each group of the ceramic sheet layers has 1 to 3 layers of ceramic sheet layers.

4. The porous ceramic matrix with multiple apertures according to claim 2, wherein There are 3 or 4 groups of the ceramic sheet layers, and each group of the ceramic sheet layers has 2 layers of ceramic sheet layers.

5. The porous ceramic matrix with multiple apertures according to claim 2, characterized in that, There are 4 groups of the ceramic sheet layers, and each group of the ceramic sheet layers has 1 layer of ceramic sheet layer. In the order of stacking from bottom to top, the average pore diameters of the micropores in the ceramic sheet layers of each layer have a gradient change pattern from large to small. Among them, the pore diameter of the micropores in the first layer of the ceramic sheet layer is 40 to 50 um, the pore diameter of the micropores in the second layer of the ceramic sheet layer is 30 to 40 um, the pore diameter of the micropores in the third layer of the ceramic sheet layer is 20 to 30 um, and the pore diameter of the micropores in the fourth layer of the ceramic sheet layer is 10 to 20 um.

6. The porous ceramic matrix with multiple apertures according to claim 2, characterized in that, There are 4 groups of the ceramic sheet layers, and each group of the ceramic sheet layers has 1 layer of ceramic sheet layer. In the order of stacking from bottom to top, the average pore diameters of the micropores in the ceramic sheet layers of each layer have a pattern of alternating large and small changes. Among them, the pore diameter of the micropores in the first layer of the ceramic sheet layer is 40 to 50 um, the pore diameter of the micropores in the second layer of the ceramic sheet layer is 30 to 40 um, the pore diameter of the micropores in the third layer of the ceramic sheet layer is 40 to 50 um, and the pore diameter of the micropores in the fourth layer of the ceramic sheet layer is 10 to 20 um.

7. The porous ceramic matrix with multiple apertures according to claim 4, characterized in that, There are 3 groups of the ceramic sheet layers, and each group of the ceramic sheet layers has 2 layers of ceramic sheet layers. The total number of sheet layers is 6. In the order from bottom to top, the average pore diameters of the micropores in the ceramic sheet layers of each layer have a gradient change pattern from large to small. Among them, the pore diameter of the micropores in the first group of the ceramic sheet layer is 35 to 50 um, the pore diameter of the micropores in the second group of the ceramic sheet layer is 20 to 35 um, and the pore diameter of the micropores in the third group of the ceramic sheet layer is 10 to 20 um.

8. The porous ceramic matrix with multiple apertures according to claim 4, characterized in that, There are 4 groups of the ceramic sheet layers, and each group of the ceramic sheet layers has 2 layers of ceramic sheet layers. The total number of sheet layers is 8. In the order from bottom to top, the average pore diameters of the micropores in the ceramic sheet layers of each layer have a gradient change pattern from large to small. Among them, the pore diameter of the micropores in the first group of the ceramic sheet layer is 40 to 50 um, the pore diameter of the micropores in the second group of the ceramic sheet layer is 30 to 40 um, the pore diameter of the micropores in the third group of the ceramic sheet layer is 20 to 30 um, and the pore diameter of the micropores in the fourth group of the ceramic sheet layer is 10 to 20 um.

9. A multi-aperture porous ceramic atomization core, characterized in that, Comprising a porous ceramic matrix with multiple apertures as described in any one of claims 1-8, one of the upper and lower surfaces of the porous ceramic matrix with multiple apertures is set as the atomization surface, and the other surface is set as the liquid guiding surface. Electrode layers are respectively provided at both ends of the atomization surface, and a metal heating layer is further provided on the atomization surface, and the metal heating layer is electrically connected to the electrode layer.

10. The porous ceramic atomization core with multiple apertures according to claim 9, characterized in that, Select the surface with smaller pore diameter of the micropores among the upper and lower surfaces of the porous ceramic matrix with multiple apertures as the atomization surface, and the other surface as the liquid guiding surface.

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