Porous ceramic bodies and their preparation methods, heating components, atomizers, and electronic atomization devices

Abstract

This invention relates to a porous ceramic body and its preparation method, a heating element, an atomizer, and an electronic atomization device. The porous ceramic body is made of one or more of quartz ceramic, cordierite ceramic, and diatomaceous earth ceramic, and the pore size of the porous ceramic body satisfies: d 50 The value ranges from 5 μm to 50 μm, and β ranges from 0.17 to 0.55, where β = (d 50 -d 10 ) / d 50 The aforementioned porous ceramic body makes the electronic atomizing device less prone to splattering and dry burning, thus improving the user experience.

Description

Technical Field

[0001] This invention relates to the field of atomization technology, and in particular to a porous ceramic body and its preparation method, a heating component, an atomizer, and an electronic atomization device. Background Technology

[0002] An electronic atomizing device is a device capable of atomizing liquids. Generally, an atomizer includes an atomizing coil, which includes a heating element. The heating element consists of a liquid guide and a heating element located on the liquid guide, which is primarily made of porous ceramic. When the electronic atomizing device is in operation, the liquid guide draws the liquid into it, and the heating element on the liquid guide heats and atomizes the liquid.

[0003] However, current electronic atomizing devices are prone to liquid splattering and dry burning, which affects the user experience. Summary of the Invention

[0004] Based on this, embodiments of this application provide a porous ceramic body that is less prone to liquid spillage and dry burning when used as a liquid guide in an electronic atomization device, thus improving the user experience.

[0005] Furthermore, embodiments of this application also provide a method for preparing the above-mentioned porous ceramic body, a heating component including the above-mentioned porous ceramic body, an atomizing core including the heating component, and an electronic atomizing device including the atomizing core.

[0006] A porous ceramic body, wherein the material of the porous ceramic body includes one or more of quartz ceramic, cordierite ceramic, and diatomaceous earth ceramic, and the pore size of the porous ceramic body satisfies: d 50 The value ranges from 5 μm to 50 μm, and β ranges from 0.17 to 0.55, where β = (d 50 -d 10 ) / d 50 .

[0007] The research presented in this application revealed that uneven pore size in porous ceramics can easily lead to oil splattering and dry burning during atomization. Therefore, the aforementioned porous ceramic body, by selecting a pore size that meets the specified d... 50 Ceramic materials with a diameter of 5μm to 50μm and a β value of 0.17 to 0.55 are used as liquid-absorbing components in the heating elements of electronic atomizing devices. This makes it less likely for the above-mentioned porous ceramic materials to cause oil splattering and dry burning when applied to electronic atomizing devices. Furthermore, the atomization efficiency is high, and it is less likely to form soot, thus improving the user experience.

[0008] In one embodiment, the porous ceramic body comprises one or more of quartz or cordierite.

[0009] In one embodiment, β is 0.2 to 0.32.

[0010] In one embodiment, the d 50 The value is 5μm to 20μm; or, the d 50 The size ranges from 15μm to 30μm.

[0011] In one embodiment, the porous ceramic body further has at least one of the following characteristics:

[0012] (1) The porosity of the porous ceramic body is 3% to 80%;

[0013] (2) The average coefficient of thermal expansion of the porous ceramic body under the condition of 800℃~1200℃ is -50ppm / ℃~20ppm / ℃;

[0014] (3) The compressive strength of the porous ceramic body is above 0.6 MPa.

[0015] In one embodiment, the porous ceramic body comprises 19wt% to 44wt% quartz.

[0016] In one embodiment, the porous ceramic body further comprises at least one of the following: 3 wt% to 2.9 wt% albite, 0.6 wt% to 2.4 wt% alumina, and 0.1 wt% to 0.4 wt% mullite;

[0017] Furthermore, the porous ceramic body also satisfies at least one of the following characteristics: the quartz includes at least one of cristobalite and α-quartz; the alumina includes α-alumina;

[0018] Furthermore, the porous ceramic body comprises 19wt% to 42wt% cristobalite and 0.2wt% to 7wt% α-quartz.

[0019] In one embodiment, the porous ceramic comprises 67wt% to 88wt% cordierite.

[0020] In one embodiment, the porous ceramic body further comprises at least one of the following: 2wt% to 5wt% mullite, 0wt% to 5wt% spinel, 0.8wt% to 1wt% forsterite, 0.5wt% to 5wt% quartz, 0.3wt% to 0.4wt% leucosite, 0.3wt% to 0.5wt% rutile, and 5wt% to 27wt% amorphous phase material.

[0021] The above-mentioned method for preparing porous ceramic bodies includes the following steps:

[0022] The raw materials for preparing porous ceramic bodies are mixed to prepare a premix;

[0023] The premixed material is molded to prepare a green body; and

[0024] The green body is sintered after debinding to prepare the porous ceramic body.

[0025] In one embodiment, the sintering temperature is 1000℃~1200℃.

[0026] A heating element comprising the aforementioned porous ceramic body and a heating element located on the porous ceramic body.

[0027] An atomizer, comprising:

[0028] Liquid storage tank, used to hold liquids; and

[0029] The aforementioned heating element is used to atomize the liquid in the storage tank.

[0030] An electronic atomizing device includes a power source and the aforementioned atomizer, wherein the power source supplies power to the atomizer. Attached Figure Description

[0031] Figure 1 A heating component is provided as an example.

[0032] Figure 2 An atomizer as one embodiment;

[0033] Figure 3 for Figure 2 The diagram shows a cross-sectional view of the atomizer.

[0034] Figure 4 For including Figure 2 A cross-sectional view of the atomizing device of the atomizer shown;

[0035] Figure 5 Electron micrographs of a commercially available porous ceramic body and the porous ceramic body of Example 1;

[0036] Figure 6 The results show the thermal shock resistance of the porous ceramics in Examples 1-10;

[0037] Figures 7-11 This study examines the atomization efficiency and soot formation of porous ceramic bodies. Detailed Implementation

[0038] To facilitate understanding of this application, a more complete description will be provided below. This application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be more thorough and complete.

[0039] It should be noted that when an element is described as "connected" to another element, it can be directly connected to the other element, or there may be one or more intermediate elements between them. When terms such as "vertical," "horizontal," "left," "right," "upper," "lower," "inner," "outer," and "bottom" are used to indicate orientation or positional relationships, this is based on the orientation or positional relationships shown in the accompanying drawings and is for ease of description only, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit this application.

[0040] In this paper, porosity and pore size were determined by a mercury porosimeter, d 10 d 50 and d 90 These represent the pore sizes corresponding to a cumulative pore size distribution percentage of 10%, 50%, and 90% for the sample, respectively. 50 Also known as median aperture or median aperture.

[0041] The research in this application found that the pore size and unevenness of porous ceramics are the causes of oil splattering and dry burning during the atomization process. Specifically, during atomization, the liquid in different pore sizes of the porous ceramic body reacts as follows: First, the low capillary pressure in the large pores is the root cause of "leakage." Then, the large amount of low-temperature "leaking liquid" seeping from the large pores directly contacts the overheated heating element, leading to "oil splattering." Next, in the subsequent high-temperature atomization process, the liquid in the large pores with low capillary pressure cannot be filled due to the high capillary force of the connected small pores, resulting in "dry burning" in the large pores. Prolonged "dry burning" further manifests as a large amount of scale (carbon deposits), affecting service life. Simultaneously, an excessively wide pore size distribution can also easily lead to an imbalance between oil supply and heat at different power levels. For example, in closed-type ceramic appliances, the atomization temperature increases with increasing heating power, resulting in an increase in the content of harmful and potentially harmful substances (HPHC), increasing the safety risk to the user.

[0042] Therefore, based on the above, one embodiment of this application provides a porous ceramic body, wherein the pore size of the porous ceramic body satisfies: d 50 The value ranges from 5 μm to 50 μm, and β ranges from 0.17 to 0.55, where β = (d 50 -d 10 ) / d 50 .

[0043] d 50This reflects the overall distribution of pore size in the aforementioned porous ceramic body. Optionally, d 50 The sizes are 5μm, 6μm, 8μm, 10μm, 12μm, 15μm, 18μm, 20μm, 22μm, 25μm, 28μm, 30μm, 35μm, 40μm, 45μm, or 49μm. Further, in some embodiments, d 50 The value is 5μm to 20μm. In other embodiments, d 50 The value is 15μm to 30μm. In other embodiments, d 50 The value is 15μm to 25μm. Furthermore, d 50 The size ranges from 18μm to 22μm.

[0044] In some embodiments, the maximum pore size of the porous ceramic body does not exceed 65 μm; the most probable pore size of the porous ceramic body does not exceed 45 μm. In some embodiments, the maximum pore size of the porous ceramic body is 38 μm to 62 μm; the most probable pore size of the porous ceramic body is 10 μm to 22 μm. In some embodiments, the maximum pore size of the porous ceramic body is 38 μm to 45 μm; the most probable pore size of the porous ceramic body is 10 μm to 22 μm.

[0045] β reflects the uniformity of the pore size distribution in the porous ceramic body; the smaller the β, the better the uniformity. Optionally, β is 0.17, 0.2, 0.25, 0.28, 0.3, 0.35, 0.4, or 0.55. In some embodiments, β is 0.17 to 0.55. Further, β is 0.22 to 0.33. Even further, β is 0.2 to 0.32. In some embodiments, β is 0.17 to 0.21.

[0046] In some embodiments, the pore size of the porous ceramic body described above satisfies: d 50 The pore size is 15 μm to 30 μm, and β is 0.17 to 0.55. In some embodiments, the pore size of the above porous ceramic body satisfies: d 50 The pore size is 18 μm to 30 μm, and β is 0.17 to 0.33. In other embodiments, the pore size of the above-mentioned porous ceramic body satisfies: d 50 The value ranges from 18 μm to 22 μm, and β ranges from 0.17 to 0.21.

[0047] Porosity is used to represent the proportion of the total pore volume in the porous ceramic body. In some embodiments, the porosity of the porous ceramic body is 3% to 80%. Optionally, the porosity of the porous ceramic body is 3%, 10%, 20%, 30%, 40%, 45%, 50%, 60%, 70%, or 80%. Further, the porosity of the porous ceramic body is 20% to 70%. Even further, the porosity of the porous ceramic body is 35% to 65%.

[0048] In some embodiments, the pore size of the porous ceramic body described above satisfies: d 50 The pore size is 15 μm to 30 μm, β is 0.17 to 0.55, and the porosity is 5% to 70%. In some embodiments, the pore size of the above-mentioned porous ceramic body satisfies: d 50 The pore size is 18 μm to 30 μm, β is 0.17 to 0.33, and the porosity is 35% to 65%. In some embodiments, the pore size of the above-mentioned porous ceramic body satisfies: d 50 The micrometer diameter is 18 μm to 22 μm, the β value is 0.17 to 0.21, and the porosity is 45% to 65%.

[0049] In some embodiments, the porous ceramic body is made of one or more of quartz ceramic, cordierite ceramic, and diatomaceous earth ceramic. In an optional specific example, the porous ceramic body is made of quartz ceramic, cordierite ceramic, or diatomaceous earth ceramic.

[0050] In some embodiments, the porous ceramic body is made of quartz ceramic. Optionally, the porous ceramic body comprises 19 wt% to 44 wt% quartz. In some specific examples, the quartz comprises at least one of cristobalite and α-quartz. Further, the porous ceramic body comprises 19 wt% to 42 wt% cristobalite and 0.2 wt% to 1.7 wt% α-quartz. Further, the porous ceramic body also comprises at least one of the following: 1.3 wt% to 2.9 wt% albite (NaAlSi3O8), 0.6 wt% to 2.4 wt% alumina, and mullite (Al6Si2O8). 13The porous ceramic body comprises 0.1 wt% to 0.4 wt%. In some specific examples, the porous ceramic body further includes an amorphous phase. In some embodiments, the porous ceramic body comprises 25 wt% to 42 wt% cristobalite, 2 wt% to 2.5 wt% albite, 0.5 wt% to 1.5 wt% α-quartz, 0.6 wt% to 2 wt% α-alumina, 0.1 wt% to 0.4 wt% mullite, and the balance being an amorphous phase. In some embodiments, the porous ceramic body comprises 25 wt% to 42 wt% cristobalite, 2 wt% to 2.5 wt% albite, 0.5 wt% to 1.5 wt% α-quartz, 0.6 wt% to 2 wt% α-alumina, 0.1 wt% to 0.4 wt% mullite, and the balance being an amorphous phase.

[0051] In some embodiments, the porous ceramic body is made of cordierite ceramic. Optionally, the porous ceramic body includes cordierite (Mg2Al4SiO2). 18 67wt%–88wt%. Further, the aforementioned porous ceramic body also includes at least one of the following: mullite 2wt%–5wt%, spinel (MgAl2O4) 0wt%–1.5wt%, forsterite (Mg2SiO4) 0.8wt%–1.1wt%, quartz 0.5wt%–1.5wt%, and calcium silicate (Ca). 14 The porous ceramic body comprises 0.3wt%–0.4wt% Mg2(SiO4)8, 0.3wt%–0.5wt% rutile (TiO2), and 4wt%–27wt% amorphous phase material. Further, the porous ceramic body includes 68wt%–85wt% cordierite, 2.5wt%–5wt% mullite, 0.5wt%–1.5wt% spinel, 0.8wt%–1wt% forsterite, 0.8wt%–1.5wt% quartz, 0.3wt%–0.4wt% leucosilicon, 0.3wt%–0.5wt% rutile, and 6wt%–25wt% amorphous phase material.

[0052] It is understandable that, whether preparing porous ceramic bodies made of cordierite or quartz ceramic materials, the raw materials include pore-forming agents and necessary forming aids. Optionally, the pore-forming agent includes at least one of graphite, amorphous carbon, cellulose, wood flour, nut shell powder, starch, and synthetic polymers such as polyethylene, polystyrene, and polyacrylate. Further, the pore-forming agent is selected from at least one of polystyrene microspheres, carbon powder, flour, and sawdust. Optionally, the particle size of the pore-forming agent is 5 μm to 100 μm. Further, the particle size of the pore-forming agent is 5 μm to 50 μm. Further, the particle size of the pore-forming agent is 10 μm to 40 μm.

[0053] In some embodiments, the average coefficient of thermal expansion of the porous ceramic body at 800°C to 1200°C is -50ppm / °C to 20ppm / °C. Further, the average coefficient of thermal expansion of the porous ceramic body at 800°C to 1200°C is -30ppm / °C to 20ppm / °C.

[0054] In some embodiments, the compressive strength of the porous ceramic body is 0.6 MPa or higher. Optionally, the compressive strength of the porous ceramic body is 0.68 MPa, 1 MPa, 1.5 MPa, 2 MPa, 2.5 MPa, 3 MPa, 4 MPa, 4.5 MPa, 5 MPa, 5.5 MPa, 6 MPa, 6.5 MPa, 7 MPa, 8 MPa, 9 MPa, 10 MPa, or 11 MPa. Further, in some embodiments, the compressive strength of the porous ceramic body is 1.5 MPa to 9 MPa. Even further, the compressive strength of the porous ceramic body is 4 MPa to 8 MPa.

[0055] In some embodiments, the pore size of the porous ceramic body described above satisfies: d 50 The porous ceramic body has a diameter of 15 μm to 30 μm, a β value of 0.17 to 0.55, a porosity of 5% to 70%, an average coefficient of thermal expansion of -50 ppm / ℃ to 20 ppm / ℃ at temperatures of 800℃ to 1200℃, and a compressive strength of 0.6 MPa to 11 MPa. In some embodiments, the pore size of the porous ceramic body satisfies: d 50 The porous ceramic body has a diameter of 18 μm to 30 μm, a β value of 0.17 to 0.33, a porosity of 35% to 65%, an average coefficient of thermal expansion of -30 ppm / ℃ to 20 ppm / ℃ at temperatures of 800℃ to 1200℃, and a compressive strength of 100 N to 210 N. In some embodiments, the pore size of the porous ceramic body satisfies: d 50 The diameter of the porous ceramic body is 18μm to 22μm, the β value is 0.17 to 0.21, the porosity is 45% to 65%, the average coefficient of thermal expansion of the above porous ceramic body under the conditions of 800℃ to 1200℃ is -30ppm / ℃ to 10ppm / ℃, and the compressive strength is 0.6MPa to 11MPa.

[0056] Furthermore, one embodiment of this application also provides a method for preparing the above-mentioned porous ceramic body, the method comprising steps S110, S120, and S130. Specifically:

[0057] Step S110: Mix the raw materials for preparing porous ceramic bodies to prepare a premix.

[0058] Specifically, the raw materials for preparing porous ceramic bodies are selected based on the material of the porous ceramic body to be obtained. For example, when preparing porous ceramic bodies made of quartz ceramic or cordierite ceramic, the raw materials are prepared accordingly, referring to the composition of porous ceramic bodies described above.

[0059] In some embodiments, in porous ceramics where quartz is the main phase component, corresponding raw materials can be selected based on the phase composition of the porous ceramic body. The raw materials mainly include: silica sources, alumina sources, metal oxide sources, and pore-forming agents, etc.

[0060] In some embodiments, the silica source is selected from at least one of quartz, cristobalite, zeolite, diatomaceous earth, fused silica, colloidal silica, amorphous silica, and glass. The median particle size (d) of the silica source is... 50 The median particle size (d) of the silica source is 5 μm to 100 μm. In some embodiments, the median particle size (d) of the silica source is... 50 The thickness ranges from 15μm to 65μm.

[0061] In some embodiments, the alumina source is selected from at least one of corundum, aluminum hydroxide (boehmite), kaolin, and clay. The median particle size (d) of the alumina source... 50 The median particle size (d) of the alumina source is 5 μm to 100 μm. In some embodiments, the median particle size (d) of the alumina source is... 50 The thickness ranges from 15μm to 65μm.

[0062] In some embodiments, the metal oxide source is primarily selected from oxides, hydroxides, salts, etc., of the corresponding metal element. For example, the sodium source is selected from at least one sodium-containing salt or alkali such as sodium carbonate, sodium hydroxide, and sodium silicate. The calcium source is selected from at least one of calcium carbonate, calcium hydroxide, calcium aluminate, calcium titanate, and calcium silicate. Correspondingly, salts or oxides of magnesium, aluminum, etc., are also used as raw materials.

[0063] In some embodiments, the pore-forming agent is selected from at least one of graphite, amorphous carbon, cellulose, wood flour, nut shell powder, starch, and synthetic polymers (e.g., polyethylene, polystyrene, and polyacrylates). The median particle size (d) of the pore-forming agent... 50 The median particle size (d) of the pore-forming agent is 5 μm to 100 μm. In some embodiments, the median particle size (d) of the pore-forming agent is... 50 The thickness ranges from 15μm to 65μm.

[0064] Understandably, a certain amount of molding agent needs to be added during the preparation process. The molding agent mainly includes at least one of organic binders and inorganic binders, lubricants, and plasticizers. The molding agent is selected from at least one of paraffin wax, stearic acid, methylcellulose, triethanolamine, and water. Further, the molding agent is selected from at least one of paraffin wax and stearic acid.

[0065] Step S120: The premixed material is shaped to prepare a green body.

[0066] Specifically, there are no restrictions on the molding method of the premix; different molding methods can be selected based on the properties of the premix.

[0067] Step S130: After removing the binder from the green body, sinter it to prepare a porous ceramic body.

[0068] In some embodiments, the sintering temperature is 1000°C to 1200°C. Optionally, the sintering temperature is 1000°C, 1050°C, 1100°C, 1150°C, or 1180°C. Further, the sintering temperature is 1000°C to 1150°C.

[0069] The above-mentioned method for preparing porous ceramic bodies is simple and conducive to large-scale production.

[0070] The aforementioned porous ceramic body has a small pore size and good uniformity of pore size distribution. When used as a liquid guiding element in the heating component of an atomizer, it can prevent the atomizer from leaking, splattering, and dry burning, thus improving the user experience. Therefore, one embodiment of this application also provides an application of the porous ceramic body of any of the above embodiments in the preparation of an electronic atomizing device. It is understood that the application of the aforementioned porous ceramic body is not limited to its use as a liquid suction element in the heating component of an electronic atomizing device, but may also have other applications, such as as a filter element in a filtration device.

[0071] In addition, please see Figure 1 One embodiment of this application also provides a heating assembly 100, which includes a liquid-absorbing member 110 and a heating element 120 located on a porous ceramic body. The liquid-absorbing member 110 is used to supply liquid to the heating element 120, and the liquid-absorbing member 110 is a porous ceramic body as described in any of the above embodiments. In some embodiments, the liquid-absorbing member 110 is strip-shaped, and the heating element 120 is located on the end face of the liquid-absorbing member 110. In this case, the liquid flows from one end of the liquid-absorbing member 110 to the other end where the heating element 120 is located, thereby being atomized.

[0072] In some embodiments, the liquid-absorbing element 110 is cylindrical, and the heating element 120 is located on the circumferential surface of the cylindrical liquid-absorbing element 110. In other embodiments, the liquid-absorbing element 110 is cylindrical, and the heating element 120 is located on the inner surface of the cylindrical liquid-absorbing element 110. In this case, the liquid flows from the outer surface of the liquid-absorbing element 110 to the hollow inner surface and is heated and atomized by the heating element 120. In other embodiments, the heating element 120 is located inside the liquid-absorbing element 110. In this case, during the fabrication of the liquid-absorbing element 110, the heating element 120 is pre-embedded in the green blank of the liquid-absorbing element 110 and sintered together. In other embodiments, the heating element 120 can also be set on the liquid-absorbing element 110 by screen printing or thick film printing and then sintered.

[0073] The heating component 100 described above includes a porous ceramic body according to any of the above embodiments, which has the corresponding advantages of the porous ceramic body.

[0074] In addition, please see Figure 2 and Figure 3 This application also provides an atomizer 10 in one embodiment. The atomizer 10 includes a liquid storage tank 200 and a heating element 100 of any of the above embodiments. The liquid storage tank 200 is used to hold a liquid atomizing matrix, and the heating element 100 is used to atomize the atomizing matrix in the liquid storage tank 200. Optionally, the liquid outlet of the liquid storage tank 200 is connected to the liquid inlet of the suction member 110, so that the liquid in the liquid storage tank 200 can flow to the suction member 110 and be atomized by the heating element 120 of the suction member 110. In the illustrated embodiment, the atomizer 10 also includes a housing 300. The heating element 100 and the liquid storage tank 200 are located inside the housing 300. An airflow channel 310 and an air outlet 320 are formed on the housing. It should be noted that in Figure 3 In the diagram, the dashed arrows indicate the direction of airflow within the atomizer 10 during inhalation.

[0075] The atomizer 10 described above includes the heating element assembly 100 of any of the above embodiments, which has the corresponding advantages of the porous ceramic body described above.

[0076] In addition, please see Figure 4 An embodiment of this application also provides an electronic atomizing device 1, including a power supply 20 and an atomizer 10 of any of the above embodiments, wherein the power supply 20 is used to supply power to the atomizer 10.

[0077] The electronic atomizing device 1 described above includes a porous ceramic body according to any of the above embodiments, which has the corresponding advantages of the porous ceramic body. Specific Implementation

[0079] The following detailed description is provided with reference to specific embodiments. Unless otherwise specified, the embodiments do not include components other than unavoidable impurities. Unless otherwise specified, the reagents and instruments used in the embodiments are conventionally selected in the art. Experimental methods not specifying specific conditions in the embodiments are implemented according to conventional conditions, such as those described in literature, books, or methods recommended by the manufacturer.

[0080] 1. Prepare the corresponding raw materials for porous ceramic bodies according to the different composition systems in Tables 1 and 2. The porous ceramic bodies in Examples 1-40 are quartz porous ceramic bodies, and the porous ceramic bodies in Examples 41-47 are cordierite porous ceramic bodies.

[0081] Table 1

[0082]

[0083]

[0084] Table 2

[0085]

[0086]

[0087] Raw material selection:

[0088] In this application, the raw materials for the porous ceramic bodies in Examples 1-5 are the same. These raw materials include diatomaceous earth, clay, and polystyrene microparticles. The forming agent is a mixture of paraffin wax and stearic acid. The median particle size of the above raw materials is 5 micrometers. The pore-forming agent accounts for 60 wt%.

[0089] In this application, the porous ceramic bodies of Examples 6-10 use the same raw materials. These raw materials include diatomaceous earth, clay, and polystyrene microparticles. The forming agent is a mixture of paraffin wax and stearic acid. The median particle size of the above raw materials is 15 micrometers. The pore-forming agent accounts for 60 wt%.

[0090] In this application, the porous ceramic bodies of Examples 11-15 use the same raw materials. These raw materials include diatomaceous earth, clay, and polystyrene microparticles. The forming agent is a mixture of paraffin wax and stearic acid. The median particle size of the above raw materials is 30 micrometers. The pore-forming agent accounts for 50 wt%.

[0091] In this application, the raw materials for the porous ceramic bodies of Examples 16-20 are the same. These raw materials include diatomaceous earth, clay, and polystyrene microparticles. The forming agent is a mixture of paraffin wax and stearic acid. The median particle size of the above raw materials is 65 micrometers. The pore-forming agent accounts for 50 wt%.

[0092] In this application, the porous ceramic bodies of Examples 21-25 use the same raw materials. These raw materials include diatomaceous earth, glass, and polystyrene microparticles. The forming agent is a mixture of paraffin wax and stearic acid. The median particle size of the above raw materials is 5 micrometers. The pore-forming agent accounts for 60 wt%.

[0093] In this application, the porous ceramic bodies of Examples 26-30 use the same raw materials. These materials include diatomaceous earth, glass, and polystyrene microparticles. The forming agent is a mixture of paraffin wax and stearic acid. The median particle size of all the above raw materials is 15 micrometers. The pore-forming agent accounts for 60 wt%.

[0094] In this application, the porous ceramic bodies of Examples 31-35 use the same raw materials. These raw materials include diatomaceous earth, glass, and polystyrene microparticles. The forming agent is a mixture of paraffin wax and stearic acid. The median particle size of the above raw materials is 30 micrometers. The pore-forming agent accounts for 50 wt%.

[0095] In this application, the porous ceramic bodies of Examples 36-40 use the same raw materials. These raw materials include diatomaceous earth, glass, and polystyrene microparticles. The forming agent is a mixture of paraffin wax and stearic acid. The median particle size of the above raw materials is 65 micrometers. The pore-forming agent accounts for 50 wt%.

[0096] As shown in Table 2, the porous ceramic bodies in Examples 41-47 are cordierite ceramics. Referring to Examples 1-40, the corresponding raw materials can be selected. Typically, the raw materials can be selected from at least one of magnesium oxide (MgO) powder, alumina (Al2O3) powder, and silicon dioxide (SiO2) powder.

[0097] 2. Preparation:

[0098] As described above, the raw materials of each porous ceramic body are mixed separately to form premixes in groups. Then, each premix is ​​shaped and debinded, and sintered at 1000℃, 1050℃, 1100℃, 1150℃ and 1200℃ respectively to produce multiple porous ceramic bodies.

[0099] 3. Testing:

[0100] (1) The pore size and porosity of each porous ceramic body were determined using a mercury porosimeter according to the mercury intrusion porosimetry method, and the internal structure of the porous ceramic body was observed using an electron microscope. Some results are shown in Table 3 and Figure 5 The phase composition of each porous ceramic body was analyzed by XRD, and the results are shown in Tables 1 and 2.

[0101] Table 3

[0102]

[0103]

[0104] Figure 5 In the image, the left side shows an electron microscope image of a commercially available product (as a comparison), and the right side shows an electron microscope image of Example 1. Figure 5 It can be seen that the porous ceramic body of this application has a more uniform pore size.

[0105] (2) The thermal shock resistance of each porous ceramic body was tested, and some results are shown below. Figure 6 As shown.

[0106] Depend on Figure 6It is evident that Examples 1-5 and Examples 6-10 exhibit good thermal shock resistance. Therefore, the porous ceramic body of this application demonstrates excellent thermal shock resistance. When applied to the heating element of an atomizer, it significantly improves the service life of the heating element. This is because, in some embodiments, the heating circuitry is typically formed using screen printing or thick film printing to create a pre-defined pattern, followed by sintering. Traditional porous ceramics have poor thermal shock resistance, easily damaging the heating circuitry during thermal shock. However, the heating element in these examples, employing the porous ceramic of this embodiment, possesses excellent thermal shock resistance, preventing damage to the heating circuitry during thermal shock.

[0107] (3) The mechanical properties of each porous ceramic body were tested, and some results are shown in Table 4.

[0108] Table 4

[0109]

[0110]

[0111] A comparison of Examples 11-14 with Examples 16-18 in Tables 3 and 4 shows that, despite a significant increase in porosity between Examples 11-14 and Examples 16-18, the compressive strength remains similar. This demonstrates that the porous ceramic proposed in this application possesses high mechanical strength. When applied to the heating element of an atomizer, it can significantly improve the service life of the heating element.

[0112] (4) The atomization efficiency (6W) and scale formation of each porous ceramic body were tested. Some results are shown below. Figures 7-11 As shown. Wherein:

[0113] Figure 7 The results show the atomization efficiency of the electronic atomizing device obtained using the porous ceramic body of Example 13. The average atomization efficiency (n=4) of this electronic atomizing device was tested to be 6.35 mg / puff. Figure 8 The results show the atomization efficiency of the electronic atomizing device obtained using the porous ceramic system of Example 18; Figure 7 and 8 In the graph, the horizontal axis represents the number of inhalation ports, and the vertical axis represents the amount of vapor. The average atomization efficiency (n=4) of the electronic atomizing device in Example 18 was tested to be 6.44 mg / puff. Meanwhile, under the same testing conditions, the commercially available heating element (as a comparison) yielded a result of 5.36 mg / puff.

[0114] Figure 9 The soot levels of commercially available heating elements (for comparison) are shown (maximum number of puffs: 200). Figure 10The soot condition of the heating element obtained using the porous ceramic body of Example 13 (maximum number of puffs: 200). Figure 11 The soot condition of the heating element obtained using the porous ceramic body of Example 18 (maximum number of puffs: 200). Figures 9-11 In the image above, the state before suction is shown, and the state after 200 suction tests is shown. It can be clearly seen that the carbon buildup in this embodiment is less than that in the comparative example.

[0115] Depend on Figures 7-11 It is known that heating components made of porous ceramic bodies with uniform pore size and high porosity have better atomization efficiency (18% to 20% higher) and produce less carbon scale, thus improving service life.

[0116] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0117] The embodiments described above are merely illustrative of several implementation methods of this application, intended to facilitate a detailed understanding of the technical solutions of this application, but should not be construed as limiting the scope of protection of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. It should be understood that technical solutions obtained by those skilled in the art based on the technical solutions provided in this application through logical analysis, reasoning, or limited experimentation are all within the scope of protection of the appended claims. Therefore, the scope of protection of this patent application should be determined by the content of the appended claims, and the specification and drawings can be used to interpret the content of the claims.

Claims

1. A porous ceramic body for an electronic atomizing device, characterized in that, The pore size distribution of the porous ceramic body satisfies: d 50 The value ranges from 18 μm to 30 μm, and β ranges from 0.17 to 0.32, where β = (d 50 -d 10 ) / d 50 The average coefficient of thermal expansion of the porous ceramic body at 800℃~1200℃ is -30ppm / ℃~20ppm / ℃. The maximum pore size of the porous ceramic body does not exceed 65 μm.

2. The porous ceramic body according to claim 1, characterized in that, The maximum pore size of the porous ceramic body is 38μm~62μm; and / or, the porous ceramic body includes one or more of quartz or cordierite.

3. The porous ceramic body according to claim 1, characterized in that, The value of β is 0.2 to 0.

32.

4. The porous ceramic body according to claim 1, characterized in that, The d 50 It is 18μm ~20μm.

5. The porous ceramic body according to claim 1, characterized in that, The porous ceramic body also has at least one of the following characteristics: (1) The porosity of the porous ceramic body is 3%~80%; (2) The average coefficient of thermal expansion of the porous ceramic body under the condition of 800℃~1200℃ is -30 ppm / ℃ ~10ppm / ℃; (3) The compressive strength of the porous ceramic body is above 0.6 MPa.

6. The porous ceramic body according to any one of claims 1 to 5, characterized in that, The porous ceramic body is made of quartz ceramic, and the porous ceramic body includes 19 wt% to 44 wt% quartz.

7. The porous ceramic body according to claim 6, characterized in that, The porous ceramic body further includes at least one of the following: 1.3 wt% to 2.9 wt% albite, 0.6 wt% to 2.4 wt% alumina, and 0.1 wt% to 0.4 wt% mullite.

8. The porous ceramic body according to claim 7, characterized in that, The porous ceramic body also satisfies at least one of the following characteristics: the quartz includes at least one of cristobalite and α-quartz; the alumina includes α-alumina.

9. The porous ceramic body according to claim 8, characterized in that, The porous ceramic body comprises 19 wt% to 42 wt% cristobalite and 0.2 wt% to 1.7 wt% α-quartz.

10. The porous ceramic body according to any one of claims 1 to 5, characterized in that, The porous ceramic body is made of cordierite ceramic, and the porous ceramic comprises cordierite at a content of 67wt% to 88wt%.

11. The porous ceramic body according to claim 10, characterized in that, The porous ceramic body further includes at least one of the following: 2wt%~5wt% mullite, 0wt%~1.5wt% spinel, 0.8wt%~1.1wt% forsterite, 0.5wt%~1.5wt% quartz, 0.3wt%~0.4wt% leucosite, 0.3wt%~0.5wt% rutile, and 5wt%~27wt% amorphous phase material.

12. The method for preparing the porous ceramic body according to claim 1, characterized in that, Includes the following steps: The raw materials for preparing porous ceramic bodies are mixed to prepare a premix; The premixed material is molded to prepare a green body; and The green body is sintered after debinding to prepare the porous ceramic body.

13. The preparation method according to claim 12, characterized in that, The sintering temperature is 1000℃~1200℃.

14. A heating element, characterized in that, The heating component includes a porous ceramic body as described in any one of claims 1 to 11 and a heating element located on the porous ceramic body.

15. An atomizer, characterized in that, include: A liquid storage tank, used to hold liquids; and The heating component of claim 14, wherein the heating component body is used to atomize the liquid in the storage tank.

16. An electronic atomizing device, characterized in that, It includes a power source and the atomizer as described in claim 15, wherein the power source is used to supply power to the atomizer.

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