Ceramic powder, ceramic slurry and application thereof

Abstract

The present invention discloses a ceramic powder, a ceramic slurry, and their applications, relating to the field of atomizers. The ceramic powder comprises the following components per 100 parts by weight: 3-18 parts silicon carbide; 30-60 parts aluminum oxide; 3-7 parts zirconium oxide; 2-6 parts basic magnesium carbonate; 4-10 parts of an additive selected from at least one of clay, kaolin, and lanthanum oxide; and 10-30 parts of a pore-forming agent. The porous ceramic prepared using the ceramic powder of the present invention exhibits a low sintering temperature, high flexural strength, and uniform pore size distribution.

Description

Technical Field

[0001] The present invention relates to the field of atomizers, and in particular to ceramic powder, ceramic slurry and applications thereof. Background Art

[0002] The atomizer core is the core technology of the atomizer, which, to a certain extent, determines the fineness of the atomization of the atomized liquid and the degree of flavor reproduction. Currently, the vast majority of commercially available atomizer cores are porous ceramic atomizer cores. Compared with traditional atomization methods, porous ceramics contain abundant micropores, and the porosity is controlled by a special sintering process, which allows the aerosol particle size of the mist to be arbitrarily adjusted. This ceramic has the characteristics of low thermal conductivity, low density, and low specific heat capacity. In addition, due to its own material properties, the temperature field of the liquid is relatively uniform during the atomization process, and the atomization is more complete per unit time, which brings a better experience to the user with higher atomization efficiency.

[0003] At present, porous ceramics are mainly made of diatomaceous earth as the base material, which is sintered by adding certain binders and pore-forming agents. Natural diatomaceous earth has a large number of pore structures, among which the mesopores and macropores have strong adsorption properties, but diatomaceous earth has obvious defects such as low mechanical strength and high sintering temperature. The strength of the ceramic matrix obtained is poor, and the ceramic matrix is ​​easily damaged and powdered during assembly, affecting the assembly yield, the atomization taste and the bonding strength between the matrix and the heating element. At present, some solutions also use quartz sand or alumina as the porous ceramic matrix material, but the prepared ceramics have low porosity and poor toughness. Summary of the Invention

[0004] The main purpose of the present invention is to provide a ceramic powder, a ceramic slurry and their application, aiming to solve the technical problems of low strength, high sintering temperature and uneven pore size distribution of existing porous ceramics.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] In a first aspect, the present invention provides a ceramic powder, wherein 100 parts by weight of the ceramic powder comprises the following components:

[0007] 3-18 parts of silicon carbide;

[0008] 30-60 parts of aluminum oxide;

[0009] 3-7 parts of zirconium oxide;

[0010] 2-6 parts of basic magnesium carbonate;

[0011] 4-10 parts of an additive, wherein the additive is at least one selected from clay, kaolin, and lanthanum oxide;

[0012] 10-30 parts of pore-forming agent.

[0013] Furthermore, the pore-forming agent is selected from at least one of starch, carbon powder, and polystyrene microspheres.

[0014] Furthermore, the silicon carbide particle size is 1-5 μm, and the aluminum oxide particle size is 300-500 mesh.

[0015] Furthermore, the silicon carbide and alumina particles overlap to form a strong skeleton structure, thereby improving the strength of the porous ceramic.

[0016] Furthermore, the zirconium oxide can improve the toughness of porous ceramics.

[0017] Furthermore, the basic magnesium carbonate can decompose to form magnesium oxide, which forms magnesium-aluminum spinel with aluminum oxide to inhibit the irregular growth of grains.

[0018] Furthermore, the clay, lanthanum oxide and kaolin can reduce the sintering temperature and refine the grains.

[0019] In a second aspect, the present invention provides a ceramic slurry prepared using the ceramic powder of the first aspect, comprising the following components per 100 parts by weight:

[0020] 8-20 parts of paraffin wax;

[0021] 3-10 parts beeswax;

[0022] 75-84 parts of ceramic powder;

[0023] Furthermore, the paraffin wax and beeswax are used as binders. The paraffin wax has a low melting point and thermal stability and can evenly wrap the ceramic powder particles. The beeswax can make the paraffin wax easy to emulsify, so that the ceramic powder and paraffin wax are better combined, the amount of paraffin wax used is reduced, the wax slurry forming performance is improved and the wax blank strength is increased.

[0024] In a third aspect, the present invention provides a method for preparing a porous ceramic, which is prepared using the ceramic slurry of the second aspect, comprising the following steps:

[0025] S1, mixing ceramic powder; mixing silicon carbide and aluminum oxide evenly, adding additives, mixing evenly, continuing to add pore-forming agent, and mixing evenly to obtain ceramic powder;

[0026] S2. Prepare ceramic slurry; weigh paraffin wax and beeswax, put them into an internal mixer, and stir until completely melted. Add the mixed ceramic powder into the internal mixer in 5-8 batches, stir for 10-15 hours to fully mix the ceramic powder particles and the binder, and then collect them for use to obtain a stable ceramic slurry.

[0027] S3, preparing a ceramic body; placing the ceramic slurry into the barrel of an injection molding machine, setting the parameters of the injection molding machine, and obtaining a ceramic body through an injection molding process;

[0028] S4, degreasing and sintering: degreasing and sintering the ceramic body, cooling it to room temperature, and obtaining porous ceramics.

[0029] Furthermore, the purpose of adding the ceramic powder into the internal mixer in 5-8 times in step S2 is to fully mix the ceramic powder particles and the binder to prevent agglomeration, which in turn affects the subsequent injection molding and degreasing processes.

[0030] Furthermore, the injection molding machine parameters are: mold temperature 30±1°C, barrel temperature of the front, middle and rear sections are 70±1°C, 80±1°C and 65±1°C respectively, injection pressure 20±3Pa, injection speed 20±2mm / s, holding time 2±1s, holding pressure 15±3Pa, cooling time 10±1s.

[0031] Furthermore, the degreasing and sintering steps in step S4 are as follows: first, the temperature is increased to 60°C at 110-130°C / h, and the temperature is kept for 1-2h; then, the temperature is increased to 120°C at 30-50°C / h, and the temperature is kept for 1-2h; then, the temperature is increased to 200°C at 10-30°C / h, and the temperature is kept for 2-3h; then, the temperature is increased to 280°C at 20-40°C / h, and the temperature is kept for 1-2h; then, the temperature is increased to 370°C at 10-30°C / h, and the temperature is kept for 2-4h; then, the temperature is increased to 500°C at 30-50°C / h, and the temperature is kept for 2-4h; then, the temperature is increased to 1000°C at 260-340°C / h, and the temperature is kept for 1-2h; finally, the temperature is increased to 1100-1250°C at 90-150°C / h, and the temperature is kept for 2-5h.

[0032] Furthermore, in the degreasing and sintering step, the purpose of the first heating and insulation is to remove moisture from the green body; the purpose of the second heating and insulation is to slowly soften the paraffin wax and beeswax; the purpose of the third and fourth heating and insulation is to discharge the paraffin wax and beeswax from the green body; the purpose of the fifth and sixth heating and insulation is to completely discharge the pore-forming agent and binder from the green body; the purpose of the seventh rapid heating is to inhibit surface diffusion in the early stage of sintering and increase the sintering densification rate; the purpose of the eighth heating and insulation is to promote grain growth and improve the toughness of the ceramic.

[0033] Furthermore, the parameters of the internal mixer in step S2 are: temperature 80-150° C., rotation speed 60-180 r / min.

[0034] In a fourth aspect, the present invention provides a method for preparing a conductive ceramic film, comprising the following steps:

[0035] (1) preparing a sol; using Ba(OH)2·8H2O and Cu(NO3)2·3H2O as raw materials, adding an organic acid and deionized water, heating in a water bath at 80-90°C with stirring, and adding ammonia water to control the pH to be greater than 7, to obtain a sol; the organic acid is selected from at least one of ethylenediaminetetraacetic acid, citric acid, and tartaric acid; further, the mass of the organic acid is 10%-25% of that of the Ba(OH)2·8H2O; and the mass of the deionized water is 5-8 times that of the Ba(OH)2·8H2O;

[0036] (2) Preparing a conductive ceramic film; placing the porous ceramic of the third aspect into a spin coater, dripping the sol onto it, setting the spin coater speed to 1500-3000 r / min, and the rotation time to 1-10 min, spin coating the porous ceramic surface to form a film, drying for 30-60 minutes, repeating the operation to increase the film thickness, and heat treating at 700-800°C to obtain a conductive ceramic film.

[0037] Furthermore, the molar ratio of Ba(OH)2·8H2O to Cu(NO3)2·3H2O is 1:(0.8-1.5).

[0038] In a fifth aspect, the present invention proposes a method for preparing a porous ceramic atomizer core, comprising the following steps: printing silver electrodes at both ends of the conductive ceramic membrane described in the fourth aspect, and heat treating the membrane at 450-550°C to obtain a porous ceramic atomizer core.

[0039] The present invention has the following technical effects:

[0040] 1. The ceramic powder of the present invention can form a strong skeleton structure by overlapping silicon carbide and aluminum oxide particles. The toughness of the ceramic can be improved by adding zirconium oxide, the strength can be improved by adding basic magnesium carbonate, and the sintering temperature of the ceramic can be reduced by the additives. The prepared porous ceramic has a low sintering temperature, high bending strength, and uniform pore size distribution.

[0041] 2. The present invention prepares a porous ceramic atomization core by spin-coating a conductive ceramic film on the surface of a porous ceramic and polymerizing the two ceramics through heat treatment. The conductive ceramic film and the porous ceramic are firmly bonded. The prepared porous ceramic atomization core generates heat through the surface conductive ceramic film. Compared with the traditional heating method, this new heating method generates heat more evenly and has a better atomization effect. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0044] In order to more fully understand the technical content of the present invention, the technical solution of the present invention is further introduced and illustrated in conjunction with specific embodiments below.

[0045] A method for preparing a porous ceramic atomizing core comprises the following steps:

[0046] (1) Mixing ceramic powder; the ceramic powder, calculated per 100 parts by weight, comprises 3-18 parts of silicon carbide; 30-60 parts of aluminum oxide; 3-7 parts of zirconium oxide; 2-6 parts of basic magnesium carbonate; 4-10 parts of an additive selected from at least one of clay, kaolin, and lanthanum oxide; and 10-30 parts of a pore former. Silicon carbide, aluminum oxide, and additives are placed in a mixer in the aforementioned proportions and mixed for 1 hour, followed by the addition of the pore former and continued mixing for 5 hours.

[0047] (2) Prepare a ceramic slurry; the ceramic slurry comprises 8-20 parts paraffin wax, 3-10 parts beeswax, and 75-84 parts ceramic powder per 100 parts by weight. The weighed paraffin wax and beeswax are added to an internal mixer and stirred until completely melted. The ceramic powder is then added to the internal mixer in 5-8 portions and stirred for 10 hours to obtain the ceramic slurry.

[0048] (3) Degreasing and sintering: putting the ceramic slurry into the barrel of the injection molding machine, setting the parameters of the injection molding machine, and obtaining the ceramic green body through the injection molding process. The ceramic body is placed in a sintering furnace, first heated to 60°C at 110-130°C / h, held for 1-2h; then heated to 120°C at 30-50°C / h, held for 1-2h; then heated to 200°C at 10-30°C / h, held for 2-3h; then heated to 280°C at 20-40°C / h, held for 1-2h; then heated to 370°C at 10-30°C / h, held for 2-4h; then heated to 500°C at 30-50°C / h, held for 2-4h; then heated to 1000°C at 260-3400°C / h, held for 1-2h; finally heated to 1100-1250°C at 90-150°C / h, held for 2-5h, and cooled to room temperature. The prepared porous ceramic is thus obtained.

[0049] (4) preparing a sol; using Ba(OH)2·8H2O and Cu(NO3)2·3H2O as raw materials, adding an organic acid, adding deionized water, heating in a water bath at 80-90°C with stirring, adding ammonia water to control the pH to be greater than 7, and obtaining a sol; the organic acid is selected from at least one of ethylenediaminetetraacetic acid, citric acid, and tartaric acid; further, the mass of the organic acid is 10%-25% of that of Ba(OH)2·8H2O; and the mass of the deionized water is 5-8 times that of Ba(OH)2·8H2O.

[0050] (5) Spin coating: Place the porous ceramic in a spin coater, drop an appropriate amount of sol on the center of the porous ceramic, set the spin coater speed to 1500-3000 r / min, and the spin time to 1-10 min. Spin coat the porous ceramic surface to form a film. After drying for 30-60 minutes, repeat the operation to increase the film thickness, and heat treat at 700-800 ° C to obtain a conductive ceramic film.

[0051] (6) Silver electrodes are printed on both ends of the conductive ceramic membrane and kept at 450-550°C for 20 minutes to obtain a porous ceramic atomization core.

[0052] In some embodiments, the pore-forming agent in step (1) is selected from at least one of starch, carbon powder, and polystyrene microspheres.

[0053] In some embodiments, the parameters of the internal mixer in step (2) are: temperature 80-150° C., speed 60-180 r / min.

[0054] In some embodiments, the injection molding machine parameters of step (3) are: mold temperature 30±1°C, barrel temperature front section, middle section and rear section temperatures are 70±1°C, 80±1°C, 65±1°C respectively, injection pressure 20±3Pa, injection speed 20±2mm / s, holding time 2±1s, holding pressure 15±3Pa, cooling time 10±1s.

[0055] In some embodiments, the molar ratio of Ba(OH)2·8H2O and Cu(NO3)2·3H2O in step (4) is 1:(0.8-1.5).

[0056] The following are examples and comparative examples provided by the present invention.

[0057] Example 1:

[0058] The preparation method of a porous ceramic atomizing core of this embodiment is as follows:

[0059] (1) The ceramic powder, calculated per 100 parts by weight, comprises 8 parts of silicon carbide, 37 parts of 400 mesh alumina, 10 parts of 300 mesh alumina, 5 parts of zirconium oxide, 3 parts of basic magnesium carbonate, 3 parts of clay, 5 parts of kaolin, 1 part of lanthanum oxide, and 28 parts of polystyrene microspheres. Silicon carbide, alumina, zirconium oxide, basic magnesium carbonate, clay, kaolin, and lanthanum oxide are placed in a mixer in the above proportions and mixed for 1 hour. The polystyrene microspheres are then added and the mixing is continued for 5 hours.

[0060] (2) The ceramic slurry, calculated per 100 parts by weight, includes 17 parts of paraffin wax, 8 parts of beeswax, and 75 parts of ceramic powder. The weighed paraffin wax and beeswax are added to an internal mixer, and the mixer temperature is set to 130°C and the speed is set to 100 r / min. After the paraffin wax and beeswax are completely melted, the mixer temperature is set to 80°C. The ceramic powder is added to the internal mixer in 5 portions and stirred for 10 hours to obtain the ceramic slurry.

[0061] (3) Place the ceramic slurry into the barrel of the injection molding machine, set the parameters of the injection molding machine, and obtain a ceramic body through the injection molding process. Place the ceramic body in a sintering furnace, first heat it to 60°C at 120°C / h and keep it warm for 1 hour; then heat it to 120°C at 40°C / h and keep it warm for 1 hour; then heat it to 200°C at 20°C / h and keep it warm for 2 hours; then heat it to 280°C at 30°C / h and keep it warm for 1 hour; then heat it to 370°C at 20°C / h and keep it warm for 2 hours; then heat it to 500°C at 40°C / h and keep it warm for 2 hours; then heat it to 1000°C at 300°C / h and keep it warm for 1 hour; finally heat it to 1100°C-1250°C at 120°C / h, keep it warm for 3 hours, and cool it to room temperature. The prepared porous ceramics are obtained.

[0062] (4) Weigh 31.5 g of Ba(OH)2·8H2O, 24.1 g of Cu(NO3)2·3H2O, 1.6 g of ethylenediaminetetraacetic acid, 2.2 g of citric acid, 3.2 g of tartaric acid, and 165 g of deionized water by mass. Stir in a 90°C water bath and add a small amount of ammonia water to control the solution pH to >7. Stir for 8 hours to obtain a sol.

[0063] (5) Place the porous ceramic in a spin coater, drop an appropriate amount of sol on the center of the porous ceramic, set the rotation speed to 2300 r / min, the rotation time to 2 min, and spin coat the porous ceramic surface to form a film. After drying for 40 minutes, repeat the above operation to increase the film thickness, and keep it at 750°C for 15 minutes to obtain a conductive ceramic film.

[0064] (6) Silver electrodes were printed on both ends of the conductive ceramic membrane and kept at 500°C for 20 min to obtain a porous ceramic atomization core.

[0065] Example 2:

[0066] The preparation method of a porous ceramic atomizing core of this embodiment is as follows:

[0067] (1) The ceramic powder, calculated per 100 parts by weight, comprises 10 parts of silicon carbide, 10 parts of 500-mesh alumina, 40 parts of 400-mesh alumina, 20 parts of 300-mesh alumina, 3 parts of zirconium oxide, 2 parts of basic magnesium carbonate, 3 parts of kaolin, 1 part of lanthanum oxide, and 21 parts of polystyrene microspheres. Silicon carbide, alumina, zirconium oxide, basic magnesium carbonate, kaolin, and lanthanum oxide are placed in a mixer in the above proportions and mixed for 1 hour. The polystyrene microspheres are then added and the mixing is continued for 5 hours.

[0068] (2) The ceramic slurry, calculated per 100 parts by weight, includes 13 parts of paraffin wax, 5 parts of beeswax, and 82 parts of ceramic powder. The weighed paraffin wax and beeswax are added to an internal mixer, and the mixer temperature is set to 130°C and the speed is set to 100 r / min. After the paraffin wax and beeswax are completely melted, the mixer temperature is set to 80°C. The ceramic powder is added to the internal mixer in 6 portions and stirred for 10 hours to obtain the ceramic slurry.

[0069] (3) Place the ceramic slurry into the barrel of the injection molding machine, set the parameters of the injection molding machine, and obtain a ceramic body through the injection molding process. Place the ceramic body in a sintering furnace, heat it to 60°C at 120°C / h, keep it warm for 1 hour, heat it to 120°C at 40°C / h, keep it warm for 1 hour, heat it to 200°C at 20°C / h, keep it warm for 2 hours, heat it to 280°C at 30°C / h, keep it warm for 1 hour, heat it to 370°C at 20°C / h, keep it warm for 2 hours, heat it to 500°C at 40°C / h, keep it warm for 2 hours, heat it to 1000°C at 300°C / h, keep it warm for 1 hour, heat it to 1180°C at 120°C / h, keep it warm for 3 hours, and cool it to room temperature. The prepared porous ceramic is obtained.

[0070] (4) Weigh, by mass, 41 g of Ba(OH)2·8H2O, 37.6 g of Cu(NO3)2·3H2O, 2.2 g of ethylenediaminetetraacetic acid, 3 g of citric acid, 4 g of tartaric acid, and 210 g of deionized water. Stir in a 90°C water bath and add a small amount of aqueous ammonia to control the solution pH to >7. Stir for 8 hours to obtain a sol.

[0071] (5) Place the porous ceramic in a spin coater, drop an appropriate amount of sol on the center of the porous ceramic, set the rotation speed to 2000 r / min, the rotation time to 3 min, and spin coat the porous ceramic surface to form a film. After drying for 40 minutes, repeat the above operation to increase the film thickness, and keep it at 720°C for 15 minutes to obtain a conductive ceramic film.

[0072] (6) Silver electrodes were printed on both ends of the conductive ceramic membrane and kept at 500°C for 20 min to obtain a porous ceramic atomization core.

[0073] Example 3:

[0074] The preparation method of a porous ceramic atomizing core of this embodiment is as follows:

[0075] (1) The ceramic powder, calculated per 100 parts by weight, comprises 13 parts of silicon carbide, 35 parts of 400-mesh alumina, 15 parts of 500-mesh alumina, 4 parts of zirconium oxide, 3 parts of basic magnesium carbonate, 8 parts of kaolin, and 22 parts of polystyrene microspheres. Silicon carbide, alumina, zirconium oxide, basic magnesium carbonate, and kaolin are placed in a mixer in the above proportions and mixed for 1 hour. The polystyrene microspheres are then added and the mixing is continued for 5 hours.

[0076] (2) The ceramic slurry, calculated per 100 parts by weight, includes 14 parts of paraffin wax, 6 parts of beeswax, and 77 parts of ceramic powder. The weighed paraffin wax and beeswax are added to an internal mixer, and the mixer temperature is set to 130°C and the speed is set to 100 r / min. After the paraffin wax and beeswax are completely melted, the mixer temperature is set to 80°C. The ceramic powder is added to the internal mixer in 5 portions and stirred for 10 hours to obtain the ceramic slurry.

[0077] (3) Place the ceramic slurry into the barrel of the injection molding machine, set the parameters of the injection molding machine, and obtain a ceramic body through the injection molding process. Place the ceramic body in a sintering furnace, heat it to 60°C at 115°C / h, keep it warm for 1 hour, heat it to 120°C at 35°C / h, keep it warm for 1 hour, heat it to 200°C at 20°C / h, keep it warm for 2 hours, heat it to 280°C at 30°C / h, keep it warm for 1 hour, heat it to 370°C at 15°C / h, keep it warm for 2 hours, heat it to 500°C at 35°C / h, keep it warm for 2 hours, heat it to 1000°C at 300°C / h, keep it warm for 1 hour, heat it to 1160°C at 120°C / h, keep it warm for 3 hours, and cool it to room temperature. The prepared porous ceramic is obtained.

[0078] (4) Weigh 37.8 g of Ba(OH)2·8H2O, 31.2 g of Cu(NO3)2·3H2O, 1.9 g of ethylenediaminetetraacetic acid, 2.5 g of citric acid, 3.6 g of tartaric acid, and 200 g of deionized water by mass. Stir in a 90°C water bath and add a small amount of ammonia water to control the solution pH to >7. Stir for 8 hours to obtain a sol.

[0079] (5) Place the porous ceramic in a spin coater, drop an appropriate amount of sol on the center of the porous ceramic, set the rotation speed to 2800 r / min, the rotation time to 1.5 min, and spin coat the porous ceramic surface to form a film. After drying for 40 minutes, repeat the above operation to increase the film thickness, and keep it at 730 ° C for 15 minutes to obtain a conductive ceramic film.

[0080] (6) Silver electrodes were printed on both ends of the conductive ceramic membrane and kept at 500°C for 20 min to obtain a porous ceramic atomization core.

[0081] Example 4:

[0082] The preparation method of a porous ceramic atomizing core of this embodiment is as follows:

[0083] (1) The ceramic powder, calculated per 100 parts by weight, comprises 18 parts of silicon carbide, 5 parts of 500-mesh alumina, 25 parts of 400-mesh alumina, 7 parts of zirconium oxide, 6 parts of basic magnesium carbonate, 4 parts of clay, 4 parts of kaolin, 1 part of lanthanum oxide, and 30 parts of starch. Silicon carbide, alumina, zirconium oxide, basic magnesium carbonate, clay, kaolin, and lanthanum oxide are placed in a mixer in the above proportions and mixed for 1 hour. The starch is then added and mixing is continued for 5 hours.

[0084] (2) The ceramic slurry, calculated per 100 parts by weight, includes 20 parts of paraffin wax, 5 parts of beeswax, and 75 parts of ceramic powder. The weighed paraffin wax and beeswax are added to an internal mixer, and the mixer temperature is set to 120°C and the speed is set to 60 r / min. After the paraffin wax and beeswax are completely melted, the mixer temperature is set to 80°C. The ceramic powder is added to the internal mixer in 6 portions and stirred for 15 hours to obtain the ceramic slurry.

[0085] (3) Place the ceramic slurry into the barrel of the injection molding machine, set the parameters of the injection molding machine, and obtain a ceramic body through the injection molding process. Place the ceramic body in a sintering furnace, heat it to 60°C at 110°C / h, keep it warm for 2h, heat it to 120°C at 30°C / h, keep it warm for 2h, heat it to 200°C at 10°C / h, keep it warm for 3h, heat it to 280°C at 20°C / h, keep it warm for 1h, heat it to 370°C at 10°C / h, keep it warm for 3h, heat it to 500°C at 30°C / h, keep it warm for 3h, heat it to 1000°C at 260°C / h, keep it warm for 1h, heat it to 1100°C at 90°C / h, keep it warm for 5h, and cool it to room temperature. The prepared porous ceramic is obtained.

[0086] (4) Weigh 34 g of Ba(OH)2·8H2O, 25.3 g of Cu(NO3)2·3H2O, 1.3 g of ethylenediaminetetraacetic acid, 2 g of citric acid, 4 g of tartaric acid, and 185 g of deionized water by mass. Stir in an 85°C water bath and add a small amount of aqueous ammonia to control the solution pH to >7. Stir for 8 hours to obtain a sol.

[0087] (5) Place the porous ceramic in a spin coater, drop an appropriate amount of sol on the center of the porous ceramic, set the rotation speed to 1500 r / min, the rotation time to 10 min, and spin coat the porous ceramic surface to form a film. After drying for 60 minutes, repeat the above operation to increase the film thickness, and keep it at 700 ° C for 15 minutes to obtain a conductive ceramic film.

[0088] (6) Silver electrodes were printed on both ends of the conductive ceramic membrane and kept at 450°C for 20 min to obtain a porous ceramic atomization core.

[0089] Example 5:

[0090] The preparation method of a porous ceramic atomizing core of this embodiment is as follows:

[0091] (1) The ceramic powder, calculated per 100 parts by weight, comprises 3 parts of silicon carbide, 10 parts of 500-mesh alumina, 40 parts of 400-mesh alumina, 20 parts of 300-mesh alumina, 7 parts of zirconium oxide, 6 parts of basic magnesium carbonate, 4 parts of kaolin, and 20 parts of carbon powder. Silicon carbide, alumina, zirconium oxide, basic magnesium carbonate, and kaolin are placed in a mixer in the above proportions and mixed for 1 hour. The carbon powder is then added and mixing is continued for 5 hours.

[0092] (2) The ceramic slurry, calculated per 100 parts by weight, includes 12 parts of paraffin wax, 10 parts of beeswax, and 78 parts of ceramic powder. The weighed paraffin wax and beeswax are added to an internal mixer, and the mixer temperature is set to 150°C and the speed is set to 180 r / min. After the paraffin wax and beeswax are completely melted, the mixer temperature is set to 80°C. The ceramic powder is added to the internal mixer in 6 portions and stirred for 10 hours to obtain the ceramic slurry.

[0093] (3) Place the ceramic slurry into the barrel of the injection molding machine, set the parameters of the injection molding machine, and obtain a ceramic body through the injection molding process. Place the ceramic body in a sintering furnace, heat it to 60°C at 130°C / h, keep it warm for 1 hour, heat it to 120°C at 50°C / h, keep it warm for 2 hours, heat it to 200°C at 30°C / h, keep it warm for 2 hours, heat it to 280°C at 40°C / h, keep it warm for 1 hour, heat it to 370°C at 30°C / h, keep it warm for 2 hours, heat it to 500°C at 50°C / h, keep it warm for 2 hours, heat it to 1000°C at 340°C / h, keep it warm for 1 hour, heat it to 1250°C at 150°C / h, keep it warm for 2 hours, and cool it to room temperature. The prepared porous ceramics are obtained.

[0094] (4) Weigh 32.4 g of Ba(OH)2·8H2O, 24.5 g of Cu(NO3)2·3H2O, 2 g of ethylenediaminetetraacetic acid, 2 g of citric acid, 2 g of tartaric acid, and 170 g of deionized water by mass. Stir in an 80°C water bath and add a small amount of aqueous ammonia to control the solution pH to >7. Stir for 8 hours to obtain a sol.

[0095] (5) Place the porous ceramic in a spin coater, drop an appropriate amount of sol on the center of the porous ceramic, set the rotation speed to 3000 r / min, the rotation time to 1 min, and spin coat the porous ceramic surface to form a film. After drying for 40 minutes, repeat the above operation to increase the film thickness, and keep it at 720°C for 15 minutes to obtain a conductive ceramic film.

[0096] (6) Silver electrodes were printed on both ends of the conductive ceramic membrane and kept at 500°C for 20 min to obtain a porous ceramic atomization core.

[0097] Example 6:

[0098] The preparation method of a porous ceramic atomizing core of this embodiment is as follows:

[0099] (1) The ceramic powder, calculated per 100 parts by weight, includes 15 parts of silicon carbide, 10 parts of 500-mesh alumina, 20 parts of 400-mesh alumina, 40 parts of 300-mesh alumina, 5 parts of zirconium oxide, 4 parts of basic magnesium carbonate, 2 parts of clay, 3 parts of kaolin, and 10 parts of polystyrene microspheres. Silicon carbide, alumina, zirconium oxide, basic magnesium carbonate, clay, and kaolin are placed in a mixer in the above proportions and mixed for 1 hour. The polystyrene microspheres are then added and mixed for 5 hours.

[0100] (2) The ceramic slurry, calculated per 100 parts by weight, includes 11 parts of paraffin wax, 5 parts of beeswax, and 84 parts of ceramic powder. The weighed paraffin wax and beeswax are added to an internal mixer, and the mixer temperature is set to 130°C and the speed is set to 100 r / min. After the paraffin wax and beeswax are completely melted, the mixer temperature is set to 80°C. The ceramic powder is added to the internal mixer in 6 portions and stirred for 12 hours to obtain the ceramic slurry.

[0101] (3) Place the ceramic slurry into the barrel of the injection molding machine, set the parameters of the injection molding machine, and obtain a ceramic body through the injection molding process. Place the ceramic body in a sintering furnace, heat it to 60°C at 120°C / h, keep it warm for 1.5h, heat it to 120°C at 40°C / h, keep it warm for 1.5h, heat it to 200°C at 20°C / h, keep it warm for 2.5h, heat it to 280°C at 30°C / h, keep it warm for 1.5h, heat it to 370°C at 20°C / h, keep it warm for 3h, heat it to 500°C at 40°C / h, keep it warm for 3h, heat it to 1000°C at 300°C / h, keep it warm for 1.5h, heat it to 2000°C at 120°C / h, keep it warm for 3h, and cool it to room temperature. The prepared porous ceramic is obtained.

[0102] (4) Weigh 36.7 g of Ba(OH)2·8H2O, 30.1 g of Cu(NO3)2·3H2O, 2 g of ethylenediaminetetraacetic acid, 2.5 g of citric acid, 3.5 g of tartaric acid, and 190 g of deionized water by mass. Stir in a 90°C water bath and add a small amount of ammonia water to control the solution pH to >7. Stir for 8 hours to obtain a sol.

[0103] (5) Place the porous ceramic in a spin coater, drop an appropriate amount of sol on the center of the porous ceramic, set the rotation speed to 2000 r / min, the rotation time to 3 min, and spin coat the porous ceramic surface to form a film. After drying for 40 minutes, repeat the above operation to increase the film thickness, and keep it at 720°C for 15 minutes to obtain a conductive ceramic film.

[0104] (6) Silver electrodes were printed on both ends of the conductive ceramic membrane and kept at 500°C for 20 min to obtain a porous ceramic atomization core.

[0105] To further illustrate the technical effects of the present invention, comparative examples 1-10 are set based on Example 1. The differences between comparative examples 1-10 and Example 1 are shown in Table 1:

[0106] Table 1 Differences between Comparative Examples 1-10 and Example 1

[0107]

[0108]

[0109] In order to prove the technical effect of the present invention, the following performance tests were carried out on Examples 1-6 and Comparative Examples 1-10 respectively:

[0110] (1) Porous ceramic performance test

[0111] The porous ceramics prepared in Examples 1-6 and Comparative Examples 1-9 were subjected to performance tests. The porosity of the ceramics was tested using a porosity tester, the pore size of the ceramics was tested using a pore size analyzer, and the flexural strength of the ceramics was tested using an electronic universal testing machine. The results are shown in Table 2 below.

[0112] Table 2 Performance of porous ceramics in Examples 1-6 and Comparative Examples 1-9

[0113]

[0114] (2) Heating film performance test

[0115] The heating films prepared in Examples 1-6 and Comparative Example 10 were tested. The thickness of the heating films was tested using a film thickness meter, and the resistance of the heating films was tested using a resistance meter. The results are shown in Table 3 below.

[0116] Table 3 Performance of the heating film of porous ceramic atomizer core

[0117]

[0118]

[0119] (3) Test of the effect of porous ceramic atomizer core

[0120] Five porous ceramic atomizer cores were prepared according to the schemes of Example 1 and Comparative Example 10, and 20 cigarette tasters puffed the same atomizing liquid on each porous ceramic atomizer core. The results were scored based on the use effect, with a full score of 10. The average of the evaluation results of the 20 cigarette tasters was taken, and the results are shown in Table 4 below.

[0121] Table 4 Hole Ceramic Atomizer Core Vacuum Evaluation Table

[0122] Atomizer core 1 Atomizer core 2 Atomizer core 3 Atomizer core 4 Atomizer core 5 Example 1 7.8 8.1 7.6 8.4 7.9 Comparative Example 10 5.6 5.2 6.5 5.9 5.5

[0123] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A method for preparing a porous ceramic atomizing core, characterized in that: The following steps are involved: (1) Preparing a sol; Ba(OH)2·8H2O and Cu(NO3)2·3H2O are used as raw materials, an organic acid is added, deionized water is added, the mixture is heated in a water bath at 80-90°C with stirring, and ammonia water is added to control the pH to be greater than 7, to obtain a sol; the organic acid is selected from at least one of ethylenediaminetetraacetic acid, citric acid, and tartaric acid; the mass of the organic acid is 10%-25% of that of Ba(OH)2·8H2O; the mass of the deionized water is 5-8 times that of Ba(OH)2·8H2O; (2) Preparing a conductive ceramic film; spin-coating the sol on the porous ceramic surface to form a film, and then heat-treating it at 700-800°C to obtain a conductive ceramic film; (3) Printing silver electrodes on both ends of the conductive ceramic membrane and heat treating it at 450-550°C to obtain a porous ceramic atomization core; The molar ratio of Ba(OH)2·8H2O to Cu(NO3)2·3H2O in step (1) is 1:(0.8-1.5); The porous ceramic described in step (2) is prepared by the following steps: S1, mixed ceramic powder; the ceramic powder is calculated per 100 parts by weight and consists of 3-18 parts of silicon carbide, 30-60 parts of aluminum oxide, 3-7 parts of zirconium oxide, 2-6 parts of basic magnesium carbonate, 4-10 parts of additives, and 10-30 parts of a pore-forming agent, wherein the additive is selected from at least one of clay, kaolin, and lanthanum oxide; according to the above ratio, the silicon carbide and aluminum oxide are mixed uniformly, zirconium oxide, basic magnesium carbonate and additives are added, mixed uniformly, and 10-30 parts of the pore-forming agent is continued to be added and mixed uniformly to obtain ceramic powder; S2. Prepare a ceramic slurry; the ceramic slurry is composed of 8-20 parts of paraffin wax, 3-10 parts of beeswax, and 75-84 parts of the ceramic powder obtained in step S1 per 100 parts by weight; according to the above ratio, mix the paraffin wax and beeswax, stir until completely melted, and obtain a paraffin wax and beeswax mixture; add the ceramic powder obtained in step S1 to the paraffin wax and beeswax mixture, and stir for 10-15 hours to obtain a ceramic slurry; S3, preparing a ceramic body; preparing a ceramic body by injection molding the ceramic slurry; S4, degreasing and sintering; degreasing and sintering the ceramic body, and cooling it to room temperature to obtain a porous ceramic; Degreasing and sintering the ceramic body comprises: Place the ceramic body in a sintering furnace, first heat it to 60°C at 110-130°C / h, and keep it warm for 1-2h; then heat it to 120°C at 30-50°C / h, and keep it warm for 1-2h; then heat it to 200°C at 10-30°C / h, and keep it warm for 2-3h; then heat it to 280°C at 20-40°C / h, and keep it warm for 1-2h; then heat it to 370°C at 10-30°C / h, and keep it warm for 2-4h; then heat it to 500°C at 30-50°C / h, and keep it warm for 2-4h; then heat it to 1000°C at 260-340°C / h, and keep it warm for 1-2h; finally heat it to 1100-1250°C at 90-150°C / h, and keep it warm for 2-5h.

2. The method for preparing a porous ceramic atomizing core according to claim 1, characterized in that: The pore-forming agent is selected from at least one of starch, carbon powder, and polystyrene microspheres.

3. The method for preparing a porous ceramic atomizing core according to claim 1, characterized in that: The silicon carbide particle size is 1-5 μm, and the aluminum oxide particle size is 300-500 mesh.

4. The method for preparing a porous ceramic atomizing core according to claim 1, characterized in that: The step S2 is performed in an internal mixer, and the parameters of the internal mixer are: temperature 80-150° C., and rotation speed 60-180 r / min.

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