A preparation method of a silicon carbide porous ceramic atomization core

Abstract

The present invention provides a method for preparing a porous silicon carbide ceramic atomization core. The porous silicon carbide ceramic atomization core obtained by the preparation method of the present invention can maintain a good oil guiding rate and oil absorption performance without powder dropping while maintaining an appropriate porosity; moreover, the preparation method is environmentally friendly, and the obtained atomization core has good thermal conductivity.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic cigarettes, and in particular relates to a method for preparing a silicon carbide porous ceramic atomization core. Background Art

[0002] The core of the electronic cigarette is the atomizer core that can produce smoke. The smoke oil is injected into the atomizer core, and the smoke oil is atomized into smoke after heating the atomizer core. The atomization effect of the atomizer core determines the quality and taste of the smoke. At present, the atomizer cores on the market mainly include porous ceramic atomizer cores and cotton cores. The former can make the electronic cigarette heat higher, the smoke oil atomization is more complete, and no carbonization occurs.

[0003] The existing electronic cigarette ceramic atomizer core has a porous structure and is generally made of materials such as diatomaceous earth and alumina. It has low thermal conductivity, which affects the atomization effect. A pore-forming agent needs to be added during the preparation process, and it needs to be sintered at a high temperature of more than 1000 degrees. The process is complicated, the cost is high, and the powder loss is relatively serious (as the porosity increases, the risk of powder loss is greater). As the porosity increases, the ceramic atomizer core may have the risk of oil leakage.

[0004] The existing CN114634372A discloses a porous ceramic material for an atomizer core, a porous ceramic body, a ceramic atomizer core, a preparation method and an electronic cigarette. The porous ceramic material for an atomizer core includes raw materials such as aggregates, pore-forming agents and organic binders. The aggregates include glass powder with a specific softening point and SiO 2 Ceramic powder, the glass powder and SiO 2 Ceramic powder has good compatibility with SiO 2 Ceramic powders are mixed in a certain proportion as ceramic aggregates, and are combined with pore-forming agents and organic binders to make the porous ceramic body made of porous ceramic materials for the atomizer core have small shrinkage, high porosity, high strength, and smooth pore inner walls, so that the oil absorption and oil conduction rates are fast. This technology increases the oil absorption and oil conduction rates by increasing the porosity, but there is a risk of powder loss, and the sintering temperature is also high.

[0005] Therefore, under the premise of properly controlling the porosity and reducing powder loss, how to improve the oil absorption and oil conduction performance of the atomizer core is a problem that needs to be solved at present. On this basis, how to improve the thermal conductivity and economic performance of the atomizer core, that is, without high-temperature sintering means, is also a technical problem that needs to be solved.

[0006] Based on this, the present invention provides a method for preparing a silicon carbide porous ceramic atomizer core. The silicon carbide porous ceramic atomizer core obtained by the preparation method of the present invention can maintain a good oil conduction rate and oil absorption performance without losing powder while maintaining an appropriate porosity; and the preparation process is environmentally friendly, and the atomizer core has good thermal conductivity. Summary of the invention

[0007] In order to solve the problems in the prior art, such as poor thermal conductivity of ceramic atomization cores, easy powder falling, excessive porosity leading to easy oil leakage, and high-temperature sintering at a preparation process temperature above 800 °C, the present invention provides a method for preparing a porous silicon carbide ceramic atomization core. The porous silicon carbide ceramic atomization core obtained by the preparation method of the present invention can maintain a good oil guiding rate and oil absorption performance without powder falling on the premise of maintaining an appropriate porosity; and the preparation method is environmentally friendly, and the obtained atomization core has good thermal conductivity.

[0008] In the first aspect of the present invention, a method for preparing a porous silicon carbide ceramic atomization core is provided, and the method includes the following steps:

[0009] (1) Mix silicon carbide particles with a diameter of 50 - 60 μm and silicon carbide particles with a diameter of 10 - 20 μm; add a binder to the mixed silicon carbide particles and mix evenly;

[0010] (2) Pour the mixed raw materials obtained in step (1) into a mold for hot pressing treatment to obtain a formed blank, and the hot pressing temperature is 100 - 300 °C;

[0011] (3) Transfer the blank obtained by hot pressing treatment in step (2) to a high-temperature furnace for sintering to obtain a porous ceramic, and the sintering temperature is 600 - 800 °C;

[0012] (4) Put the obtained porous ceramic into an acetic acid solution for cleaning and drying to obtain a porous silicon carbide ceramic atomization core;

[0013] (5) Immerse the porous silicon carbide ceramic atomization core obtained in step (4) in a surfactant solution for ultrasonic impregnation for 10 - 30 min, and then dry it to obtain a porous silicon carbide ceramic atomization core.

[0014] Furthermore, the surfactant used in the above step (5) is one or more of tributylmethylammonium chloride, sodium alkylbenzene sulfonate, polyoxyethylene lauryl ether, polyoxyethylene alkylphenol ether, and stearamide.

[0015] The surfactant can be well impregnated into the porous structure of the ceramic atomization core. The combination of large-particle-size and small-particle-size silicon carbide ceramics forms a porous structure, which is conducive to the surfactant entering the pores. The surfactant is adsorbed in the pores of the porous ceramic structure, which is conducive to the penetration and diffusion of e-liquid.

[0016] Further, the weight ratio of the silicon carbide particles with a diameter of 50 - 60 μm to the silicon carbide particles with a diameter of 10 - 20 μm is 30:70 - 70:30, more preferably 40:60 - 60:40, and even more preferably 40:60 - 50:50. The combination of silicon carbide particles with different particle sizes can adjust the porosity of the porous ceramic. Among them, for the silicon carbide particles with a diameter of 50 - 60 μm and the silicon carbide particles with a diameter of 10 - 20 μm, the pore structure adjusted within the weight ratio range of 30:70 - 70:30 is beneficial to the impregnation of the surfactant, and the oil guiding and oil absorption performance of the ceramic atomizing core after lipophilic modification is improved. Further, when the weight ratio of the silicon carbide particles with a diameter of 50 - 60 μm to the silicon carbide particles with a diameter of 10 - 20 μm is 40:60 - 50:50, better performance is obtained and there is no problem of powder shedding.

[0017] Further, the binder used in the preparation process is one or more of sodium silicate, polyvinyl alcohol, paraffin emulsion, and aluminum hydroxide. The binder dosage is 3 - 5%, that is, it accounts for 3 - 5% of the total raw material consumption of the silicon carbide porous ceramic. The use of the binder can promote the bonding of silicon carbide particles to each other and is beneficial to hot pressing forming.

[0018] Further, during the hot pressing process in step (2), the pressure is 30 - 200 MPa, and the hot pressing time is 5 - 10 minutes. The grading method of large and small particle sizes of silicon carbide is convenient for molding by die pressing. Only a small amount of binder needs to be added to form. The hot pressing pressure is more preferably 30 - 100 MPa, even more preferably 30 - 80 MPa, 30 - 70 MPa, 30 - 60 MPa, 30 - 50 MPa, 30 - 40 MPa. The above pressures can all achieve hot pressing forming, and the hot pressing temperature is 100 - 300 °C.

[0019] Further, the sintering time in step (3) is 1 - 2 h, and the sintering temperature is 600 - 800 °C. Further, the sintering temperature can be 600 - 750 °C, more preferably 600 - 650 °C. By adopting the above particle size grading method and selecting the material of silicon carbide, without using a pore-forming agent, the sintering temperature can be reduced to below 800 °C and powder shedding can be ensured not to occur.

[0020] Further, in step (4), the mass concentration of the acetic acid solution is 5% - 10%. The acetic acid solution is used to clean the sintered porous ceramic, which can pre-remove the fine powder particles with unstable consolidation, ensure that the formed porous ceramic does not shed powder, and reduce the possibility of powder shedding; the cleaning method of the acetic acid solution is more preferably an ultrasonic cleaning method, and the cleaning time is 5 - 10 minutes.

[0021] Further, the mass percentage of the surfactant solution used in the above step (5) is 2-10%, more preferably 3-8%, and the ultrasonic impregnation temperature is 25-40°C. The appropriate temperature is conducive to the diffusion and attachment of the surfactant.

[0022] The second aspect of the present invention provides a silicon carbide porous ceramic atomizing core, which is prepared by using the above-mentioned method for preparing a silicon carbide porous ceramic atomizing core.

[0023] Advantages of the present invention:

[0024] The present invention provides a method for preparing a silicon carbide porous ceramic atomizing core, which uses silicon carbide particles with different particle sizes as raw materials to obtain different porosity structures through particle size grading; the silicon carbide material has good thermal conductivity and fast heating, and the effectiveness of the oil-loving impregnation treatment is ensured through particle size grading, improving the oil guiding rate and oil absorption performance of the atomizing core.

[0025] The present invention adopts the silicon carbide particle size grading method, ensuring a moderate porosity and no powder falling, with good stability.

[0026] The present invention provides a method for preparing a silicon carbide porous ceramic atomizing core, which uses silicon carbide particles with specific contents and particle size ratios, and obtains a silicon carbide porous ceramic atomizing core by hot pressing and low-temperature sintering, with low process costs. Description of the drawings

[0027] Figure 1 The silicon carbide porous ceramic atomizing core prepared for Example 1. Detailed implementation manners

[0028] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further elaborates on the present invention in combination with examples and attached Figure 1 , drawings. The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. It should be understood that the following description is only used to explain the present invention and is not used to limit the present invention.

[0029] As used herein, the terms "comprising", "including", "having", "containing" or any other variation thereof are intended to cover non-exclusive inclusion. For example, a composition, step, method, article or device containing the listed elements is not necessarily limited to those elements, but may include other elements not explicitly listed or elements inherent to such composition, step, method, article or device.

[0030] The phrase "consisting of" excludes any unrecited element, step, or component. If used in a claim, this phrase renders the claim closed, excluding materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a clause within the body of a claim rather than immediately following the subject, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0031] When an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper preferred values and lower preferred values, it should be understood that all ranges formed by any pairing of any upper range limit or preferred value with any lower range limit or preferred value are specifically disclosed, whether or not the ranges are separately disclosed. For example, when the range "1 to 5" is disclosed, the described range should be interpreted as including the ranges "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described herein, unless otherwise stated, the range is intended to include its end values and all integers and fractions within the range.

[0032] In some instances, approximating language may correspond to the precision of the instrument for measuring a value. In the specification and claims of this application, range limitations may be combined and / or interchanged. Unless otherwise stated, these ranges include all sub-ranges subsumed therein.

[0033] The indefinite articles "a" and "an" before an element or component of the present invention do not limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be construed to include one or at least one, and an element or component in the singular form also includes the plural form, unless the quantity clearly refers only to the singular form.

[0034] The description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. in the present invention means that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the technical features involved in each embodiment of the present invention can be combined with each other as long as they do not conflict with each other.

[0035] Unless otherwise specified, the raw materials and equipment used in the present invention can be purchased from the market or are commonly used in the art. The methods in the examples, unless otherwise stated, are conventional methods in the art.

[0036] An embodiment of the present invention provides a method for preparing a porous silicon carbide ceramic atomization core, the method comprising the following steps:

[0037] (1) Mix silicon carbide particles with a diameter of 50 - 60 μm and silicon carbide particles with a diameter of 10 - 20 μm; add a binder to the mixed silicon carbide particles and stir to mix evenly.

[0038] (2) Pour the mixed raw material obtained in step (1) into a mold for hot pressing to obtain a formed blank, and the hot pressing temperature is 100 - 300 °C.

[0039] (3) Transfer the blank obtained by hot pressing in step (2) to a high-temperature furnace for sintering to obtain a porous ceramic, and the sintering temperature is 600 - 800 °C.

[0040] (4) Put the obtained porous ceramic into an acetic acid solution for cleaning and drying to obtain a silicon carbide porous ceramic atomization core.

[0041] (5) Immerse the silicon carbide porous ceramic atomization core obtained in step (4) in a surfactant solution for ultrasonic impregnation for 10 - 30 min, and then dry it to obtain a silicon carbide porous ceramic atomization core.

[0042] Further, the surfactant used in step (5) above is one or more of tributylmethylammonium chloride, sodium alkylbenzene sulfonate, polyoxyethylene lauryl ether, polyoxyethylene alkylphenol ether, and stearamide. In some embodiments, the weight ratio of the silicon carbide particles with a diameter of 50 - 60 μm to the silicon carbide particles with a diameter of 10 - 20 μm is 30:70 - 70:30, more preferably 40:60 - 60:40, and further preferably 40:60 - 50:50. In some embodiments, the binder used in the preparation process is one or more of sodium silicate, polyvinyl alcohol, paraffin emulsion, and aluminum hydroxide, and the binder dosage is 3 - 5%, that is, it accounts for 3 - 5% of the total raw material dosage of the silicon carbide porous ceramic.

[0043] In some embodiments, during the hot pressing in step (2), the pressure is 30 - 200 MPa, the hot pressing time is 5 - 10 minutes, and the hot pressing pressure is more preferably 30 - 100 MPa, further preferably 30 - 80 MPa, 30 - 70 MPa, 30 - 60 MPa, 30 - 50 MPa, 30 - 40 MPa. The above pressures can all achieve hot pressing forming, and the hot pressing temperature is 100 - 300 °C.

[0044] In some embodiments, the sintering time in step (3) is 1 - 2 h, the sintering temperature is 600 - 800 °C. Further, the sintering temperature can be 600 - 750 °C, and more preferably 600 - 650 °C.

[0045] In some embodiments, in step (4), the mass concentration of the acetic acid solution is 5%-10%. The cleaning method of the acetic acid solution is further preferably ultrasonic cleaning, and the cleaning time is 5-10 minutes.

[0046] In some embodiments, the mass percentage of the surfactant solution used in step (5) above is 2-10%, further preferably 3-8%, and the temperature of the ultrasonic impregnation is 25-40°C.

[0047] The following is described in conjunction with specific embodiments. Example 1

[0048] Silicon carbide particles with a diameter of 50-60 um and silicon carbide particles with a diameter of 10-20 um are screened and mixed according to a mass ratio of 40:60. Then 5% sodium silicate is added as a binder, and the dry materials are stirred and mixed evenly; the uniformly mixed raw materials are poured into a mold for hot pressing treatment. The heating temperature is 300°C, the pressure is 40 MPa, and the pressure time is 10 minutes. A formed blank is obtained through hot pressing treatment; the blank after hot pressing treatment is transferred to a sintering furnace for sintering to obtain a porous ceramic. The sintering temperature is 600°C, and the sintering time is maintained for 1 h; after cooling, the porous ceramic is put into a 6% acetic acid solution for ultrasonic cleaning for 5 minutes, dried and then transferred to a 5% sodium alkylbenzene sulfonate solution for ultrasonic impregnation for 10 minutes, and then dried at 100°C to obtain a silicon carbide porous ceramic atomization core. The specific shape is shown in the appendix Figure 1 The performance of the porous ceramic atomization core is tested and measured as follows:

[0049] Porosity test method: Test according to "Test Methods for Apparent Porosity and Bulk Density of Porous Ceramics" GB / T1966-1996. The oil absorption rate is measured using a general-purpose fully automatic ceramic atomization core oil absorption rate measuring instrument in the industry. The test method is as follows: The e-liquid for testing is filled into a constant temperature cup, the porous ceramic atomization core is vertically hung, the rising displacement is set, and the equipment start button is clicked. The instrument automatically raises the e-liquid to the position where it contacts the lower end of the porous ceramic core, and at the same time records the weight change values at all time points during the e-liquid climbing process, and generates a curve of weight change over time.

[0050] Thermal conductivity and powder shedding test: A heating circuit is set on the porous ceramic atomization core, the e-liquid is filled into a constant temperature cup, the porous ceramic atomization core is vertically hung, the rising displacement is set, and the equipment start button is clicked. The instrument automatically raises the e-liquid to the position where it contacts the lower end of the porous ceramic core, and the e-liquid is intermittently heated by power on. The temperature change of the ceramic atomization core is detected by infrared. After intermittent power on 20 times, the atomization core is taken out for ethanol cleaning and observe whether there are solid powders in the e-liquid, and observe whether there are solid powders in the ethanol cleaning solution after cleaning.

[0051] The relevant test data are recorded in Table 1. For specific relevant data, see Table 1. Example 2

[0052] Screen silicon carbide particles with a diameter of 50 - 60 μm and silicon carbide particles with a diameter of 10 - 20 μm, mix them according to a mass ratio of 30:70, then add 5% sodium silicate as a binder, and dry-mix the materials evenly; pour the evenly mixed raw materials into a mold for hot pressing treatment, with a heating temperature of 300 °C, a pressure of 40 MPa, and a pressure application time of 10 minutes. Obtain a formed blank through hot pressing treatment; transfer the blank after hot pressing treatment to a sintering furnace for sintering to obtain a porous ceramic, where the sintering temperature is 600 °C and the sintering time is 1 h; put the porous ceramic into a 6% acetic acid solution for ultrasonic cleaning for 5 minutes, dry it, transfer it to a 5% sodium alkylbenzene sulfonate solution for ultrasonic impregnation for 60 minutes, and then dry it at 100 °C to obtain a silicon carbide porous ceramic atomization core. Detect and test the performance of the porous ceramic atomization core. Example 3

[0053] Screen silicon carbide particles with a diameter of 50 - 60 μm and silicon carbide particles with a diameter of 10 - 20 μm, mix them according to a mass ratio of 20:80, then add 5% sodium silicate as a binder, and dry-mix the dry materials evenly; pour the evenly mixed raw materials into a mold for hot pressing treatment, with a heating temperature of 300 °C, a pressure of 40 MPa, and a pressure application time of 20 minutes. Obtain a formed blank through hot pressing treatment, transfer the blank after hot pressing treatment to a sintering furnace for sintering to obtain a porous ceramic, where the sintering temperature is 600 °C and the sintering time remains 1 h; put the porous ceramic into a 6% acetic acid solution for ultrasonic cleaning for 5 minutes, dry it, transfer it to a 5% sodium alkylbenzene sulfonate solution for ultrasonic impregnation for 20 minutes, and then dry it at 100 °C to obtain an oil-loving silicon carbide porous ceramic atomization core. Detect and test the performance of the porous ceramic atomization core. Example 4

[0054] Screen silicon carbide particles with a diameter of 50 - 60 μm and silicon carbide particles with a diameter of 10 - 20 μm, mix them according to a mass ratio of 50:50, then add 5% sodium silicate as a binder, and dry-mix the dry materials evenly; pour the evenly mixed raw materials into a mold for hot pressing treatment, with a heating temperature of 300 °C, a pressure of 40 MPa, and a pressure application time of 20 minutes. Obtain a formed blank through hot pressing treatment, transfer the blank after hot pressing treatment to a sintering furnace, and obtain a porous ceramic after low-temperature sintering, with a sintering temperature of 600 °C and the sintering time remaining 1 h; put the porous ceramic into a 6% acetic acid solution for ultrasonic cleaning for 5 minutes, dry it, and then transfer it to a 5% sodium alkylbenzene sulfonate solution for ultrasonic impregnation for 20 minutes, and then dry it at 100 °C to obtain a silicon carbide porous ceramic atomization core, and detect and test the performance of the porous ceramic atomization core. Example 5

[0055] Screen silicon carbide particles with a diameter of 50 - 60 μm and silicon carbide particles with a diameter of 10 - 20 μm, mix them according to a mass ratio of 60:40, then add 5% sodium silicate as a binder, and mix the dry materials evenly; pour the evenly mixed raw materials into a mold for hot pressing treatment, with a heating temperature of 300 °C, a pressure of 40 MPa, and a pressing time of 10 minutes. Obtain a formed green body through hot pressing treatment, transfer the hot-pressed green body to a sintering furnace for sintering to obtain a porous ceramic, where the sintering temperature is 600 °C and the sintering time is maintained for 1 h; put the porous ceramic into a 6% acetic acid solution for ultrasonic cleaning for 10 minutes, dry it, transfer it to a 5% sodium alkylbenzenesulfonate solution for ultrasonic impregnation for 60 minutes, and then dry it at 100 °C to obtain a silicon carbide porous ceramic atomization core, and detect and test the performance of the porous ceramic atomization core. Example 6

[0056] Screen silicon carbide particles with a diameter of 50 - 60 μm and silicon carbide particles with a diameter of 10 - 20 μm, mix them according to a mass ratio of 70:30, then add 5% sodium silicate as a binder, and mix the dry materials evenly; pour the evenly mixed raw materials into a mold for hot pressing treatment, with a heating temperature of 300 °C, a pressure of 40 MPa, and a pressing time of 10 minutes. Obtain a formed green body through hot pressing treatment, transfer the hot-pressed green body to a sintering furnace for low-temperature sintering to obtain a porous ceramic, where the sintering temperature is 600 °C and the sintering time is maintained for 1 h; put the porous ceramic into a 6% acetic acid solution for ultrasonic cleaning for 5 minutes, dry it, transfer it to a 5% sodium alkylbenzenesulfonate solution for ultrasonic impregnation for 30 minutes, and then dry it at 100 °C to obtain an oil-loving silicon carbide porous ceramic atomization core, and detect and test the performance of the porous ceramic atomization core. Example 7

[0057] Screen silicon carbide particles with a diameter of 50 - 60 μm and silicon carbide particles with a diameter of 10 - 20 μm, mix them according to a mass ratio of 80:20, then add 5% sodium silicate as a binder, and mix the dry materials evenly; pour the evenly mixed raw materials into a mold for hot pressing treatment, with a heating temperature of 300 °C, a pressure of 40 MPa, and a pressing time of 10 minutes. Obtain a formed green body through hot pressing treatment, transfer the hot-pressed green body to a sintering furnace for sintering to obtain a porous ceramic, where the sintering temperature is 600 °C and the sintering time is maintained for 1 h; put the porous ceramic into a 6% acetic acid solution for ultrasonic cleaning for 5 minutes, dry it, transfer it to a 5% sodium alkylbenzenesulfonate solution for ultrasonic impregnation for 20 minutes, and then dry it at 100 °C to obtain an oil-loving silicon carbide porous ceramic atomization core, and detect and test the performance of the porous ceramic atomization core. Example 8

[0058] Screen silicon carbide particles with a diameter of 50 - 60 μm and silicon carbide particles with a diameter of 10 - 20 μm, mix them according to a mass ratio of 40:60, then add 5% sodium silicate as a binder, and mix the dry materials evenly; pour the evenly mixed raw materials into a mold for hot pressing treatment, with a heating temperature of 300 °C, a pressure of 40 MPa, and a pressing time of 10 minutes. Obtain a formed blank through hot pressing treatment, transfer the blank after hot pressing treatment to a sintering furnace for low-temperature sintering to obtain a porous ceramic, with a sintering temperature of 650 °C and a sintering time of 1 h; put the porous ceramic into a 6% acetic acid solution for ultrasonic cleaning for 5 minutes, dry it, transfer it to a 5% sodium alkylbenzene sulfonate solution for ultrasonic impregnation for 60 minutes, and then dry it at 100 °C to obtain an oil-wettable silicon carbide porous ceramic atomization core, and detect and test the performance of the porous ceramic atomization core. Example 9

[0059] Screen silicon carbide particles with a diameter of 50 - 60 μm and silicon carbide particles with a diameter of 10 - 20 μm, mix them according to a mass ratio of 40:60, then add 5% sodium silicate as a binder, and mix the dry materials; pour the evenly mixed raw materials into a mold for hot pressing treatment, with a heating temperature of 300 °C, a pressure of 40 MPa, and a pressing time of 10 minutes. Obtain a formed blank through hot pressing treatment, transfer the blank after hot pressing treatment to a sintering furnace for sintering to obtain a porous ceramic, with a sintering temperature of 750 °C and a sintering time of 1 h; put the porous ceramic into a 6% acetic acid solution for ultrasonic cleaning for 5 minutes, dry it, transfer it to a 5% sodium alkylbenzene sulfonate solution for ultrasonic impregnation for 15 minutes, and then dry it at 100 °C to obtain an oil-wettable silicon carbide porous ceramic atomization core, and detect and test the performance of the porous ceramic atomization core. Example 10

[0060] Screen silicon carbide particles with a diameter of 50 - 60 μm and silicon carbide particles with a diameter of 10 - 20 μm, mix them according to a mass ratio of 40:60, then add 5% sodium silicate as a binder, and mix the dry materials evenly; pour the evenly mixed raw materials into a mold for hot pressing treatment, with a heating temperature of 300 °C, a pressure of 40 MPa, and a pressing time of 10 minutes. Obtain a formed blank through hot pressing treatment, transfer the blank after hot pressing treatment to a sintering furnace for sintering to obtain a porous ceramic, with a sintering temperature of 800 °C and a sintering time of 1 h; put the porous ceramic into a 6% acetic acid solution for ultrasonic cleaning for 5 minutes, dry it, transfer it to a 5% sodium alkylbenzene sulfonate solution for ultrasonic impregnation for 10 minutes, and then dry it at 100 °C to obtain an oil-wettable silicon carbide porous ceramic atomization core, and detect and test the performance of the porous ceramic atomization core. Example 11

[0061] Screen silicon carbide particles with a diameter of 50 - 60 μm and silicon carbide particles with a diameter of 10 - 20 μm, mix them according to a mass ratio of 40:60, then add 5% sodium silicate as a binder, and mix the dry materials evenly; pour the evenly mixed raw materials into a mold for hot pressing treatment, with a heating temperature of 300 °C, a pressure of 40 MPa, and a pressure application time of 10 minutes. After hot pressing treatment, a formed blank is obtained. Transfer the blank after hot pressing treatment to a sintering furnace for sintering to obtain a porous ceramic, where the sintering temperature is 500 °C and the sintering time is maintained for 1 h; put the porous ceramic into a 6% acetic acid solution for ultrasonic cleaning for 5 minutes, dry it, transfer it to a 5% sodium alkylbenzenesulfonate solution for ultrasonic impregnation for 15 minutes, and then dry it at 100 °C to obtain an oil - wettable silicon carbide porous ceramic atomization core. Detect and test the performance of the porous ceramic atomization core. Example 12

[0062] Screen silicon carbide particles with a diameter of 50 - 60 μm and silicon carbide particles with a diameter of 30 - 40 μm, mix them according to a mass ratio of 40:60, then add 5% sodium silicate as a binder, and mix the dry materials evenly; pour the evenly mixed raw materials into a mold for hot pressing treatment, with a heating temperature of 300 °C, a pressure of 40 MPa, and a pressure application time of 10 minutes. After hot pressing treatment, a formed blank is obtained. Transfer the blank after hot pressing treatment to a sintering furnace for sintering to obtain a porous ceramic, where the sintering temperature is 600 °C and the sintering time is maintained for 1 h; put the porous ceramic into a 6% acetic acid solution for ultrasonic cleaning for 5 minutes, dry it, transfer it to a 5% sodium alkylbenzenesulfonate solution for ultrasonic impregnation for 20 minutes, and then dry it at 100 °C to obtain an oil - wettable silicon carbide porous ceramic atomization core. Detect and test the performance of the porous ceramic atomization core. Example 13

[0063] Screen silicon carbide particles with a diameter of 70 - 80 μm and silicon carbide particles with a diameter of 10 - 20 μm, mix them according to a mass ratio of 40:60, then add 5% sodium silicate as a binder, and mix the dry materials evenly; pour the evenly mixed raw materials into a mold for hot pressing treatment, with a heating temperature of 300 °C, a pressure of 40 MPa, and a pressure application time of 15 minutes. After hot pressing treatment, a formed blank is obtained. Transfer the blank after hot pressing treatment to a sintering furnace for sintering to obtain a porous ceramic, where the sintering temperature is 600 °C and the sintering time is maintained for 1 h; put the porous ceramic into a 6% acetic acid solution for ultrasonic cleaning for 5 minutes, dry it, transfer it to a 5% sodium alkylbenzenesulfonate solution for ultrasonic impregnation for 20 minutes, and then dry it at 100 °C to obtain an oil - wettable silicon carbide porous ceramic atomization core. Detect and test the performance of the porous ceramic atomization core. Example 14

[0064] Screen silicon carbide particles with a diameter of 50 - 60 μm and silicon carbide particles with a diameter of 10 - 20 μm, mix them according to a mass ratio of 40:60, then add 5% sodium silicate as a binder, and mix the dry materials evenly; pour the evenly mixed raw materials into a mold for hot pressing treatment, with a heating temperature of 300 °C, a pressure of 40 MPa, and a pressing time of 10 minutes. Obtain a formed blank through hot pressing treatment, transfer the blank after hot pressing treatment to a sintering furnace for sintering to obtain a porous ceramic, where the sintering temperature is 600 °C and the sintering time is maintained for 1 h; put the porous ceramic into a 6% acetic acid solution for ultrasonic cleaning for 5 minutes, dry it, transfer it to distilled water for ultrasonic impregnation for 60 minutes, and then dry it at 100 °C to obtain an oil-wettable silicon carbide porous ceramic atomization core, and detect and test its performance. Example 15

[0065] Screen silicon carbide particles with a diameter of 50 - 60 μm and silicon carbide particles with a diameter of 10 - 20 μm, mix them according to a mass ratio of 40:60, then add 5% sodium silicate as a binder, and mix the dry materials evenly; pour the evenly mixed raw materials into a mold for hot pressing treatment, with a heating temperature of 300 °C, a pressure of 40 MPa, and a pressing time of 10 minutes. Obtain a formed blank through hot pressing treatment. Transfer the blank after hot pressing treatment to a sintering furnace for low-temperature sintering to obtain a porous ceramic, where the sintering temperature is 600 °C and the sintering time is maintained for 1 h; put the porous ceramic into a 6% acetic acid solution for ultrasonic cleaning for 5 minutes, dry it, transfer it to a 5% tributylmethylammonium chloride solution for ultrasonic impregnation for 20 minutes, and then dry it at 100 °C to obtain an oil-wettable silicon carbide porous ceramic atomization core, and detect and test the performance of the porous ceramic atomization core.

[0066] Furthermore, the examples also conducted experiments on dodecyl polyoxyethylene ether, alkylphenol polyoxyethylene ether, and stearamide as surfactants, which are Examples 16 - 18 respectively. See the relevant data in Table 1 for details.

[0067] Table 1 Preparation process and performance parameters of silicon carbide porous ceramic atomization core

[0068]

[0069] The data results of Examples 1 - 7 show that the dosage of the size grading of silicon carbide particle sizes has an impact on the porosity, oil absorption rate, powder loss, and thermal conductivity of silicon carbide ceramics. An excessive or too small dosage ratio has a significant impact on the oil absorption rate, powder loss, and thermal conductivity. The above data further illustrate that the weight ratio of the 50 - 60 μm silicon carbide particles to the 10 - 20 μm silicon carbide particles should be between 30:70 and 70:30.

[0070] The data results of Example 1 and Examples 8 - 11 show that the sintering temperature has an impact on the stability of silicon carbide ceramics. If the sintering temperature is too low, the crystallization of the ceramics is unstable, resulting in easy powder shedding.

[0071] The data of Examples 1, 12 - 13 show that different selections of the particle size of silicon carbide directly affect the performance of the porous ceramic atomization core, including the powder shedding performance, oil absorption performance, and heat conduction performance. The data of Example 1, 14 show that the impregnation treatment with surfactants has an important impact on the oil absorption rate of the porous ceramic atomization core. In summary, to achieve a good oil absorption rate, it is not only related to surfactants, but also related to the dosage of particle size grading and the particle size. The three work together synergistically to achieve a better oil absorption rate.

[0072] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A preparation method of a silicon carbide porous ceramic atomization core, the method comprising the following steps: (1) Mix silicon carbide particles with a diameter of 50-60 μm and silicon carbide particles with a diameter of 10-20 μm, add a binder to the mixed silicon carbide particles, and stir and mix evenly; (2) Pour the mixed raw materials obtained in step (1) into a mold for hot pressing treatment to obtain a formed blank, and the hot pressing temperature is 100-300 °C; (3) Transfer the blank obtained by hot pressing treatment in step (2) to a high-temperature furnace for sintering to obtain a porous ceramic, and the sintering temperature is 600-800 °C; (4) Put the obtained porous ceramic into an acetic acid solution for cleaning and drying to obtain a silicon carbide porous ceramic atomization core; (5) Immerse the silicon carbide porous ceramic atomization core obtained in step (4) in a surfactant solution for ultrasonic impregnation for 5-10 min, and then dry it to obtain a lipophilic silicon carbide porous ceramic atomization core; The surfactant is one or more of tributylmethylammonium chloride, sodium alkylbenzene sulfonate, polyoxyethylene lauryl ether, polyoxyethylene alkylphenol ether, and stearamide; the weight ratio of the silicon carbide particles with a diameter of 50-60 μm to the silicon carbide particles with a diameter of 10-20 μm is 30:70-70:

30.

2. A preparation method of a silicon carbide porous ceramic atomization core according to claim 1, characterized in that, The binder is one or more of sodium silicate, polyvinyl alcohol, paraffin emulsion, and aluminum hydroxide, and the binder dosage is 3-5%.

3. A preparation method of a silicon carbide porous ceramic atomization core according to claim 1, characterized in that, During the hot pressing process in step (2), the pressure is 30-200 MPa, and the hot pressing time is 5-10 minutes.

4. A preparation method of a silicon carbide porous ceramic atomization core according to claim 1, characterized in that, The sintering time in step (3) is 1-2 h.

5. A preparation method of a silicon carbide porous ceramic atomization core according to claim 1, characterized in that, The mass concentration of the acetic acid solution in step (4) is 5%-10%.

6. A preparation method of a silicon carbide porous ceramic atomization core according to claim 1, characterized in that, The mass percentage of the surfactant solution is 2-10%.

7. A preparation method of a silicon carbide porous ceramic atomization core according to claim 6, characterized in that, The ultrasonic impregnation temperature is 25-40 °C.

8. A silicon carbide porous ceramic atomization core, characterized in that, It is prepared by using the preparation method of a silicon carbide porous ceramic atomization core according to any one of claims 1-7.

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