CN110845251B - Preparation method of atomization core, atomization assembly and electronic cigarette - Google Patents
Preparation method of atomization core, atomization assembly and electronic cigarette Download PDFInfo
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Abstract
The invention provides an atomization core preparation method, an atomization core, an atomization assembly and an atomizer, wherein the method comprises the steps of selecting a porous ceramic plate and carrying out flat grinding on the porous ceramic plate; placing the porous ceramic plate in distilled water for cleaning and drying to obtain a porous ceramic plate after secondary treatment; preparing coating slurry by adopting fine aggregate powder and a coarse pore-forming agent; coating the coating slurry on the porous ceramic plate after the second treatment to form a coating; baking to obtain a porous ceramic plate with a dry blank coating with the thickness of 10-100 microns on the surface; carrying out glue removal and decomposing the pore-forming agent to obtain a composite porous plate with a porous ceramic coating on the surface; manufacturing an electrode heating wire on one surface of the composite porous plate with the coating through screen printing to obtain the composite porous plate with the electrode heating wire; and placing the composite porous plate with the electrode heating wire in a reducing atmosphere to burn the electrode to obtain the sheet type ceramic atomizing core with the composite structure. The porous coating greatly improves the surface roughness of the porous ceramic plate substrate and improves the printability.
Description
Technical Field
The invention relates to the technical field of electronic cigarette atomizing cores, in particular to an atomizing core preparation method, an atomizing core, an atomizing assembly and an electronic cigarette.
Background
The porous ceramic atomizing core is a core component of the oil storage type electronic cigarette and mainly plays a role in conducting tobacco tar and atomizing the tobacco tar. At present, most of oil storage type ceramic atomizing cores adopt a sheet type structure described in a published Chinese patent CN 108354232A: a heat generating member is formed on the surface of a porous ceramic sheet having a large number of through holes as a base by screen printing. Compared with a wire winding type ceramic atomizing core, the slice type ceramic atomizing core has the advantages of large tobacco tar evaporation area, large smoke amount, more uniform heat distribution and higher atomizing efficiency.
The oil guiding speed is one of the core performance indexes of the flake ceramic atomizing core. If the oil supply speed is insufficient, the electrodes are easy to be burnt, burnt flavor appears, and the experience of consumers is seriously influenced. At present, porous ceramic matrixes used for sheet-type ceramic atomizing cores on the market are generally prepared by a method of stacking aggregate particles and adding pore-forming agents. The aperture of the porous ceramic prepared by the method is in direct proportion to the particle size of the aggregate. The larger the particle size of the aggregate, the larger the pore diameter and the faster the oil guiding speed. Therefore, in order to ensure a large oil guiding speed, large-sized aggregate particles and large-sized pore-forming agents are selected as raw materials to form macropores. However, the porous ceramic plate prepared from the large-size aggregate and the pore-forming agent has a large surface roughness (generally Ra > 45 μm), and even the surface thereof has many large pits with a size of more than 200 μm. When the electrode slurry is printed by taking the porous ceramic plate as a substrate, the surface roughness is high, and the slurry is seriously infiltrated due to pits, so that the serious problems of collapse, weak connection, broken line, defect and the like of the electrode are caused. In addition, the porous ceramic plate has the serious problems that the subsequent electrode printing is influenced by the fact that pits, large roughness and the like are easily generated on the surface of the porous ceramic plate due to insufficient strength of the porous ceramic plate in the flat grinding process.
Disclosure of Invention
The invention provides an atomization core preparation method, an atomization core, an atomization assembly and an electronic cigarette, aiming at solving the problem of large surface roughness of a porous ceramic plate prepared by taking large-size aggregate and a pore-forming agent as raw materials in the prior art.
In order to solve the above problems, the technical solution adopted by the present invention is as follows:
a preparation method of an atomization core comprises the following steps: s1: selecting a porous ceramic plate and carrying out flat grinding processing on the porous ceramic plate to obtain a porous ceramic plate after primary treatment; s2: placing the porous ceramic plate after the first treatment in distilled water for cleaning and drying to obtain a porous ceramic plate after the second treatment; s3: preparing coating slurry by adopting fine aggregate powder and a coarse pore-forming agent; s4: coating the coating slurry on the porous ceramic plate after the second treatment by a slurry coating technology to form a coating layer to obtain a porous ceramic plate after the third treatment; s5: baking the porous ceramic plate after the third treatment to obtain a porous ceramic plate with a dry blank coating with the thickness of 10-100 mu m on the surface; s6: carrying out glue removal on the porous ceramic plate with the dry blank coating and decomposing a pore-forming agent to obtain a composite porous plate with a porous ceramic coating on the surface; s7: manufacturing an electrode heating wire on one surface of the composite porous plate with the coating through screen printing to obtain the composite porous plate with the electrode heating wire; s8: and placing the composite porous plate with the electrode heating wire in a reducing atmosphere to burn the electrode to obtain the sheet type ceramic atomizing core with a composite structure.
Preferably, the thickness d of the porous ceramic plate after the first treatment is 2 +/-0.1 mm, the flatness is less than or equal to 0.15mm, the average surface roughness Ra is 30-60 mu m, and the average oil guiding speed is 18-30 mg/(cm)2·min)。
Preferably, the method for preparing the coating slurry by using the fine aggregate powder and the coarse pore-forming agent comprises the following steps: s31: selecting crystalline silicon dioxide with D50 of 1-10 mu m, kaolin and anhydrous potassium carbonate as the fine aggregate powder, selecting substances with D50 of 50-150 mu m and capable of volatilizing or combusting at a certain temperature as pore forming agents, and preparing the pore forming agents according to the mass ratio: uniformly mixing crystalline silicon dioxide, kaolin, anhydrous potassium carbonate and pore forming agent in a ratio of 1-2: 0.1-0.5: 0.05-0.15: 1-3 to obtain mixed raw material powder; s32: adding terpineol or ethanol as a solvent, BYK110 as a dispersing agent, an ethyl cellulose solution as an adhesive and OE400 as a plasticizer into the raw material powder to obtain a mixture; s33: and (3) uniformly dispersing the mixture and regulating the viscosity to be 20-150 KcP to obtain the coating slurry.
Preferably, the addition amount of the solvent is 10 to 30% of the mass of the raw material powder, the addition amount of the binder is 3 to 10% of the mass of the raw material powder, the addition amount of the plasticizer is 40 to 60% of the mass of the binder, and the addition amount of the dispersant is 3 to 10% of the mass of the raw material powder.
Preferably, in step S5, the baking is performed in an oven at 100-150 ℃ for 10-20 min.
Preferably, step S6 includes the steps of: s61: placing the porous ceramic plate with the dry blank coating in a box furnace in an air atmosphere, heating to 400-600 ℃ at the speed of 0.5-1.5 ℃/min, and preserving heat for 1-3 h to remove glue; s62: heating to 500-1000 ℃ at the speed of 1-6 ℃/min, and preserving heat for 1-3 hours to fully decompose the pore-forming agent; s63: heating to 1100-1400 ℃, and preserving heat for 1-3 h; and then cooling along with the furnace to obtain the composite porous plate with the surface covered with the porous ceramic coating.
The invention also provides an atomizing core which is prepared by adopting the preparation method of the atomizing core.
Preferably, the method sequentially comprises: porous ceramic matrix, porous coating and electrode heating component.
The invention also provides an atomizing assembly which comprises the atomizing core.
The invention further provides an electronic cigarette which comprises the atomization assembly.
The invention has the beneficial effects that: the preparation method comprises the steps of preparing a porous thin coating on the surface of a porous ceramic plate with large surface roughness in advance by a slurry coating technology to improve the roughness, and then preparing a heating wire electrode on the surface of the coating. The process route has the characteristics of simple equipment, low cost, high efficiency and easy industrial production.
The porous ceramic coating is manufactured by adopting the idea of adding fine aggregate powder and coarse pore-forming agent. Under the process conditions specified by the invention, the coating not only does not influence the oil guiding speed, but also greatly improves the surface roughness of the porous ceramic plate, thereby improving the printability of the ceramic plate. The electrode is manufactured on the coating surface of the composite porous ceramic plate, and the problems of printing disconnection, weak connection and the like of the heating electrode are hopefully solved.
The coating prepared by the process route has the characteristics of controllable pore diameter and porosity, uniform and controllable thickness and firm combination with the matrix ceramic.
Drawings
FIG. 1 is a schematic illustration of a method of making an atomizing core in an embodiment of the present disclosure.
FIG. 2 is a schematic diagram of a method of forming a coating slurry using fine aggregate powder and coarse pore formers in accordance with an embodiment of the present invention.
FIG. 3 is a schematic diagram of a method for obtaining a composite porous plate with a porous ceramic coating on the surface thereof according to an embodiment of the present invention.
FIG. 4(a) is a surface SEM image of a porous ceramic matrix in an example of the present invention.
Fig. 4(b) is a surface SEM image of the porous ceramic substrate with the coating layer in the example of the present invention.
FIG. 5(a) is a diagram of an Optical Mirror (OM) of a porous ceramic substrate in an embodiment of the present invention.
FIG. 5(b) is a diagram of an Optical Mirror (OM) with the heating electrode effect printed on the surface of the composite porous plate coating in the embodiment of the present invention.
Fig. 6 is a schematic structural view of an atomizing core in an embodiment of the present invention.
Wherein, 1-porous ceramic matrix, 2-porous coating, 3-electrode heating component.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the embodiments of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. In addition, the connection may be for either a fixing function or a circuit connection function.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the embodiments of the present invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be in any way limiting of the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
Example 1
As shown in fig. 1, a method for preparing an atomizing core includes the following steps:
s1: selecting a porous ceramic plate and carrying out flat grinding processing on the porous ceramic plate to obtain a porous ceramic plate after primary treatment;
in one embodiment of the invention, a porous ceramic plate (A) with a thickness and a flatness meeting the use requirements (the thickness d is 2 +/-0.1 mm, and the flatness is less than or equal to 0.15mm) is obtained by selecting the porous ceramic plate and carrying out flat grinding on the porous ceramic plate by using 30-100 meshes, 200-400 meshes and 500-800 meshes of grinding wheels in sequence. The average surface roughness Ra is 30-60 μm, and the average oil guiding speed is 18-30 mg/(cm)2·min)。
S2: placing the porous ceramic plate after the first treatment in distilled water for cleaning and drying to obtain a porous ceramic plate after the second treatment;
in an embodiment of the invention, the porous ceramic plate after the first treatment is placed in distilled water, ultrasonically cleaned twice within 30-60 min, and then placed in an oven to be dried, so as to obtain a porous ceramic plate after the second treatment.
S3: preparing coating slurry by adopting fine aggregate powder and a coarse pore-forming agent;
s4: coating the coating slurry on the porous ceramic plate after the second treatment by a slurry coating technology to form a coating layer to obtain a porous ceramic plate after the third treatment;
s5: baking the porous ceramic plate after the third treatment to obtain a porous ceramic plate with a dry blank coating with the thickness of 10-100 mu m on the surface;
in one embodiment of the invention, the porous ceramic plate is baked in an oven at 100-150 ℃ for 10-20 min to obtain the porous ceramic plate with the dry blank coating with the thickness of about 10-100 μm on the surface. The thickness of the coating is another key factor influencing the oil guiding speed of the composite ceramic plate. The porous ceramic coating is manufactured by adopting the idea of increasing the pore-forming agent by using fine powder, the thickness of the coating must be controlled within a small range, otherwise, the coating is easy to form closed pores, and the oil guiding speed of the composite porous plate is seriously reduced.
S6: carrying out glue removal on the porous ceramic plate with the dry blank coating and decomposing a pore-forming agent to obtain a composite porous plate with a porous ceramic coating on the surface;
s7: manufacturing an electrode heating wire on one surface of the composite porous plate with the coating through screen printing to obtain the composite porous plate with the electrode heating wire;
s8: and placing the composite porous plate with the electrode heating wire in a reducing atmosphere to burn the electrode to obtain the sheet type ceramic atomizing core with a composite structure.
As shown in fig. 2, the method for preparing coating slurry by using fine aggregate powder and coarse pore-forming agent comprises the following steps:
s31: selecting crystalline silicon dioxide with D50 of 1-10 mu m, kaolin and anhydrous potassium carbonate as the fine aggregate powder, selecting substances with D50 of 50-150 mu m and capable of volatilizing or combusting at a certain temperature as pore forming agents, and preparing the pore forming agents according to the mass ratio: uniformly mixing crystalline silicon dioxide, kaolin, anhydrous potassium carbonate and pore forming agent in a ratio of 1-2: 0.1-0.5: 0.05-0.15: 1-3 to obtain mixed raw material powder;
the particle size of the aggregate is one of the key factors influencing the surface roughness of the coating. If the particle size of the aggregate is large, the roughness of the coating is large, and the effect of improving the roughness cannot be achieved. In addition, the size of the pore-forming agent is one of the key factors influencing the oil guiding speed of the composite porous plate.
S32: adding terpineol or ethanol as a solvent, BYK110 as a dispersing agent, an ethyl cellulose solution as an adhesive and OE400 as a plasticizer into the raw material powder to obtain a mixture;
in one embodiment, the solvent is added in an amount of 10% to 30% by mass of the raw material powder, the binder is added in an amount of 3% to 10% by mass of the raw material powder, the plasticizer is added in an amount of 40% to 60% by mass of the binder, and the dispersant is added in an amount of 3% to 10% by mass of the raw material powder.
S33: and (3) uniformly dispersing the mixture and regulating the viscosity to be 20-150 KcP to obtain the coating slurry.
The mixture may be uniformly dispersed using a high-speed disperser.
As shown in fig. 3, step S6 includes the following steps:
s61: placing the porous ceramic plate with the dry blank coating in a box furnace in an air atmosphere, heating to 400-600 ℃ at the speed of 0.5-1.5 ℃/min, and preserving heat for 1-3 h to remove glue;
s62: heating to 500-1000 ℃ at the speed of 1-6 ℃/min, and preserving heat for 1-3 hours to fully decompose the pore-forming agent;
s63: heating to 1100-1400 ℃, and preserving heat for 1-3 h; and then cooling along with the furnace to obtain the composite porous plate with the surface covered with the porous ceramic coating.
Example 2
In one embodiment of the present invention, the atomizing core is prepared by the following steps:
(1) selecting a porous ceramic plate, and carrying out flat grinding processing on the porous ceramic plate by using 30-mesh, 200-mesh and 500-mesh grinding wheels in sequence to obtain a porous ceramic plate with thickness and flatness meeting the use requirements: a porous ceramic plate A having a thickness d of 2. + -. 0.1mm and a flatness of 0.15mm or less, and having an average surface roughness Ra of 50 μm and an average oil guiding speed of 21.2 mg/(cm)2·min)。
(2) And placing the porous ceramic plate A in distilled water, ultrasonically cleaning twice within 45min, and then placing in an oven for drying to obtain a dried porous ceramic plate B.
(3) The coating slurry is prepared by adopting a method of adding fine aggregate powder and a coarse pore-forming agent. Selecting crystalline silicon dioxide SiO with D50 of 5 mu m2Kaolin Al2O3·2SiO2·2H2O and anhydrous potassium carbonate K2CO3Is aggregate, and the D50 is wood chips with the diameter of 80 mu m and is taken as pore-forming agent according to the mass ratio of SiO2∶Al2O3·2SiO2·2H2O∶K2CO3The pore-forming agent and the pore-forming agent are mixed uniformly according to the ratio of 1.8: 0.2: 0.1: 2, and mixed raw material powder C is obtained.
(4) A solvent (terpineol or ethanol), a dispersant (BYK110), a binder (ethylcellulose), and a plasticizer (OE400) were added to the raw powder C to obtain a mixture D. Wherein the adding amount of the solvent is about 20 percent of the mass of the raw material powder, the adding amount of the adhesive is 8 percent of the mass of the raw material powder, the adding amount of the plasticizer is about 50 percent of the mass of the adhesive, and the adding amount of the dispersing agent is about 8 percent of the mass of the raw material powder.
(5) The mixture D was uniformly dispersed by a high-speed disperser, and the viscosity thereof was adjusted to 100KcP to obtain coating slurry E.
(6) The porous ceramic plate B is used as a substrate, and the coating slurry E is printed on one surface of the porous ceramic plate B by a printing technology to form a thin coating.
(7) And (3) baking the porous ceramic with the printed slurry on the surface in an oven at 120 ℃ for 15min to obtain a porous ceramic plate F with a dry blank coating with the thickness of about 30 microns on the surface.
(8) Placing the porous ceramic plate F in a box furnace in an air atmosphere, heating to 500 ℃ at the speed of 1 ℃/min, and preserving heat for 2 hours to remove glue; then heating to 600 ℃ at the speed of 5 ℃/min and preserving heat for 2h to ensure that the pore-forming agent is fully combusted to form a porous structure coating; then heating to 1300 ℃, and preserving heat for 2 h; and then cooling with the furnace. Thus obtaining the composite porous plate G with the surface covered with the porous ceramic thin coating.
The test result shows that: the average oil guiding speed of the composite porous plate is basically unchanged compared with that of the base ceramic, and is 21.2 mg/(cm)2Min) to 20.7 mg/(cm)2Min); the average surface roughness Ra is greatly improved and reduced from the original 50 μm to 12 μm.
(9) And manufacturing an electrode heating wire on one surface of the composite porous plate G with the coating through screen printing to obtain a composite porous plate H with an electrode.
(10) And (3) placing the composite porous plate H with the electrode in a reducing atmosphere to burn the electrode to obtain the sheet type ceramic atomizing core with the composite structure.
As shown in fig. 4(a) to 4(b), SEM comparison images of the surfaces of the porous ceramic substrate and the porous ceramic substrate with the porous coating layer are shown. The figure shows that: the porous ceramic matrix has a large number of large pits on the surface, and the pit condition and the roughness are obviously improved after the coating is prepared.
As shown in fig. 5(a) to 5(b), the porous ceramic substrate and the composite porous plate coating layer are printed with heat generating electrode effect mirrors (OM) on the surface thereof, respectively. The figure shows that: the electrode is directly printed on the surface of the rough porous ceramic substrate, so that the phenomena of collapse, broken line, defect and weak connection can be caused, the electrode on the surface of the composite porous plate coating is full and intact, and the improvement effect is very obvious.
Example 3
(1) Selecting a porous ceramic plate, and carrying out flat grinding processing on the porous ceramic plate by using 50-mesh, 300-mesh and 600-mesh grinding wheels in sequence to obtain a porous ceramic plate with thickness and flatness meeting the use requirements: a porous ceramic plate A having a thickness d of 2. + -. 0.1mm and a flatness of 0.15mm or less, and having an average surface roughness Ra of 45 μm and an average oil guiding speed of 18.5 mg/(cm)2·min)。
(2) And placing the porous ceramic plate A in distilled water, ultrasonically cleaning twice within 30min, and then placing in an oven for drying to obtain a dried porous ceramic plate B.
(3) The coating slurry is prepared by adopting a method of adding fine aggregate powder and a coarse pore-forming agent. Selecting crystal silicon dioxide SiO with D50 of 2 mu m2Kaolin Al2O3·2SiO2·2H2O and anhydrous potassium carbonate K2CO3Is used as aggregate, PMMA with the D50 of 50 mu m is used as pore-forming agent according to the mass ratio of SiO2∶Al2O3·2SiO2·2H2O∶K2CO3The pore-forming agent and the pore-forming agent are mixed uniformly according to the ratio of 1.1: 0.1: 0.05: 1 to obtain the mixed raw material powder C.
(4) Solvent (terpineol or ethanol), dispersant (BYK110), binder (ethylcellulose solution) and plasticizer (OE400) were added to C to give mixture D. Wherein the adding amount of the solvent is about 10 percent of the mass of the raw material powder, the adding amount of the adhesive is 4 percent of the mass of the raw material powder, the adding amount of the plasticizer is about 40 percent of the mass of the adhesive, and the adding amount of the dispersing agent is about 4 percent of the mass of the raw material powder.
(5) D was uniformly dispersed by a high-speed disperser and the viscosity thereof was adjusted to 30KcP to obtain coating slurry E.
(6) The porous ceramic plate B is used as a substrate, and the coating slurry E is printed on one surface of the porous ceramic plate B by a printing technology to form a thin coating.
(7) And (3) baking the porous ceramic with the surface printed with the slurry in an oven at 100 ℃ for 10min to obtain a porous ceramic plate F with a dry blank coating with the thickness of about 15 microns on the surface.
(8) Placing the porous ceramic plate F in a box furnace in an air atmosphere, heating to 400 ℃ at the speed of 0.5 ℃/min, and preserving heat for 1h to remove glue; then heating to 600 ℃ at the speed of 2 ℃/min and preserving heat for 2h to ensure that the pore-forming agent is fully combusted to form a porous structure coating; then heating to 1350 ℃ and preserving heat for 1 h; then cooling along with the furnace; thus obtaining the composite porous plate G with the surface covered with the porous ceramic thin coating.
The test result shows that: the average oil guiding speed of the composite porous plate is basically unchanged compared with that of the base ceramic, and is 18.5 mg/(cm)2Min) to 18.2 mg/(cm)2Min); the average surface roughness Ra is greatly improved and reduced from 45 μm to 10 μm.
(9) And manufacturing an electrode heating wire on one surface of the composite porous plate G with the coating through screen printing to obtain a composite porous plate H with an electrode.
(10) And (3) placing the composite porous plate H with the electrode in a reducing atmosphere to burn the electrode to obtain the sheet type ceramic atomizing core with the composite structure.
Example 4
(1) Selecting a porous ceramic plate, and carrying out flat grinding processing on the porous ceramic plate by using a grinding wheel of 100 meshes, 400 meshes and 800 meshes in sequence to obtain a porous ceramic plate with thickness and flatness meeting the use requirements: a porous ceramic plate A having a thickness d of 2 + -0.1 mm and a flatness of less than or equal to 0.15mm, and having an average surface roughness Ra of 60 μm and an average oil pick-up speed of 28.9mg(cm2·min)。
(2) And placing the porous ceramic plate A in distilled water, ultrasonically cleaning twice within 60min, and then placing in an oven for drying to obtain a dried porous ceramic plate B.
(3) The coating slurry is prepared by adopting a method of adding fine aggregate powder and a coarse pore-forming agent. Selecting crystal silicon dioxide SiO with D50 of 10 mu m2Kaolin Al2O3·2SiO2·2H2O and anhydrous potassium carbonate K2CO3As an aggregate, graphite with the D50 of 150 mu m is taken as a pore-forming agent according to the mass ratio of SiO2∶Al2O3·2SiO2·2H2O∶K2CO3The pore-forming agent and the pore-forming agent are mixed uniformly according to the proportion of 1.5: 0.45: 0.15: 2.8 to obtain the mixed raw material powder C.
(4) A solvent (terpineol or ethanol), a dispersant (BYK110), a binder (ethylcellulose), and a plasticizer (OE400) were added to the raw powder C to obtain a mixture D. Wherein the adding amount of the solvent is about 30 percent of the mass of the raw material powder, the adding amount of the adhesive is 10 percent of the mass of the raw material powder, the adding amount of the plasticizer is about 60 percent of the mass of the adhesive, and the adding amount of the dispersing agent is about 10 percent of the mass of the raw material powder.
(5) The mixture D was uniformly dispersed by a high-speed disperser, and the viscosity thereof was adjusted to 150KcP to obtain coating slurry E.
(6) The porous ceramic plate B is used as a substrate, and the coating slurry E is printed on one surface of the porous ceramic plate B by a printing technology to form a thin coating.
(7) And (3) baking the porous ceramic with the printed slurry on the surface in an oven at 150 ℃ for 20min to obtain a porous ceramic plate F with a dry blank coating with the thickness of about 96 mu m on the surface.
(8) Placing the porous ceramic plate F in a box furnace in an air atmosphere, heating to 600 ℃ at the speed of 1.5 ℃/min, and preserving heat for 3 hours to remove glue; then heating to 900 ℃ at the speed of 6 ℃/min and preserving heat for 2h to ensure that the pore-forming agent is fully combusted to form a porous structure coating; then heating to 1150 ℃, and preserving heat for 3 hours; and then cooling with the furnace. Thus obtaining the composite porous plate G with the surface covered with the porous ceramic thin coating.
The test result shows that: the compositeThe average oil guiding speed of the perforated plate is basically kept unchanged compared with that of the base ceramic, and is changed from the original 28.9 mg/(cm)2Min) to 28.5 mg/(cm)2Min); the average surface roughness Ra is greatly improved and reduced from the original 60 mu m to 15 mu m.
(9) And manufacturing an electrode heating wire on one surface of the composite porous plate G with the coating through screen printing to obtain a composite porous plate H with an electrode.
(10) And (3) placing the composite porous plate H with the electrode in a reducing atmosphere to burn the electrode to obtain the sheet type ceramic atomizing core with the composite structure.
Example 5
As shown in fig. 6, the invention also provides an atomizing core prepared by the preparation method of the atomizing core. Sequentially comprises the following steps: a porous ceramic matrix 1, a porous coating layer 2 and an electrode heat generating component 3.
The invention also provides an atomization assembly which comprises the atomization core.
The invention also provides an electronic cigarette, which comprises the atomization assembly.
The invention uses the slurry coating technology to produce a porous thin coating on the surface of the porous ceramic plate with large surface roughness in advance to improve the roughness, and then produces the heating wire electrode on the surface of the coating. The process route has the characteristics of simple equipment, low cost, high efficiency and easy industrial production.
The porous ceramic coating is manufactured by adopting the idea of adding fine aggregate powder and coarse pore-forming agent. Under the process conditions specified by the invention, the coating not only does not influence the oil guiding speed, but also greatly improves the surface roughness of the porous ceramic plate, thereby improving the printability of the ceramic plate. The electrode is manufactured on the coating surface of the composite porous ceramic plate, and the problems of printing disconnection, weak connection and the like of the heating electrode are hopefully solved.
The coating prepared by the process route has the characteristics of controllable pore diameter and porosity, uniform and controllable thickness and firm combination with the matrix ceramic.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several equivalent substitutions or obvious modifications can be made without departing from the spirit of the invention, and all the properties or uses are considered to be within the scope of the invention.
Claims (10)
1. A preparation method of an atomization core is characterized by comprising the following steps:
s1: selecting a porous ceramic plate and carrying out flat grinding processing on the porous ceramic plate to obtain a porous ceramic plate after primary treatment;
s2: placing the porous ceramic plate after the first treatment in distilled water for cleaning and drying to obtain a porous ceramic plate after the second treatment;
s3: preparing coating slurry by adopting fine aggregate powder and a coarse pore-forming agent; the particle size of the fine aggregate powder is D50 and is 1-10 mu m; the particle size of the coarse pore-forming agent D50 is 50-150 mu m;
s4: coating the coating slurry on the porous ceramic plate after the second treatment by a slurry coating technology to form a coating layer to obtain a porous ceramic plate after the third treatment;
s5: baking the porous ceramic plate after the third treatment to obtain a porous ceramic plate with a dry blank coating with the thickness of 10-100 mu m on the surface;
s6: carrying out glue removal on the porous ceramic plate with the dry blank coating and decomposing a pore-forming agent to obtain a composite porous plate with a porous ceramic coating on the surface;
s7: manufacturing an electrode heating wire on one surface of the composite porous plate with the coating through screen printing to obtain the composite porous plate with the electrode heating wire;
s8: and placing the composite porous plate with the electrode heating wire in a reducing atmosphere to burn the electrode to obtain the sheet type ceramic atomizing core with the composite structure.
2. The method for preparing an atomizing core according to claim 1, wherein the porous ceramic plate after the first treatment has a thickness d =2 ± 0.1mm and a flatness ≤ 0.15mm, average surface roughness Ra of 30-60 μm, and average oil guiding speed of 18-30 mg/(cm)2∙min）。
3. The method of preparing an atomizing core according to claim 1, wherein the method of preparing the coating slurry using the fine aggregate powder and the coarse pore-forming agent comprises the steps of:
s31: selecting crystalline silicon dioxide with D50 of 1-10 mu m, kaolin and anhydrous potassium carbonate as the fine aggregate powder, selecting substances with D50 of 50-150 mu m and capable of volatilizing or combusting at a certain temperature as pore forming agents, and preparing the pore forming agents according to the mass ratio: uniformly mixing crystalline silicon dioxide, kaolin, anhydrous potassium carbonate and pore forming agent = 1-2: 0.1-0.5: 0.05-0.15: 1-3 to obtain well-mixed raw material powder;
s32: adding terpineol or ethanol as a solvent, BYK110 as a dispersing agent, an ethyl cellulose solution as an adhesive and OE400 as a plasticizer into the raw material powder to obtain a mixture;
s33: and (3) uniformly dispersing the mixture and regulating the viscosity to be 20-150 KcP to obtain the coating slurry.
4. The method for preparing the atomizing core according to claim 3, wherein the solvent is added in an amount of 10% to 30% by mass of the raw material powder, the binder is added in an amount of 3% to 10% by mass of the raw material powder, the plasticizer is added in an amount of 40% to 60% by mass of the binder, and the dispersant is added in an amount of 3% to 10% by mass of the raw material powder.
5. The method for preparing the atomizing core according to claim 1, wherein in step S5, the drying is performed in an oven at 100-150 ℃ for 10-20 min.
6. The method for preparing an atomizing core according to claim 1, wherein step S6 includes the steps of:
s61: placing the porous ceramic plate with the dry blank coating in a box furnace in an air atmosphere, heating to 400-600 ℃ at the speed of 0.5-1.5 ℃/min, and preserving heat for 1-3 h to remove glue;
s62: heating to 500-1000 ℃ at the speed of 1-6 ℃/min, and preserving heat for 1-3 hours to fully decompose the pore-forming agent;
s63: heating to 1100-1400 ℃, and preserving heat for 1-3 h; and then cooling along with the furnace to obtain the composite porous plate with the surface covered with the porous ceramic coating.
7. An atomizing core characterized by being produced by the method for producing an atomizing core according to any one of claims 1 to 6.
8. The atomizing core of claim 7, comprising, in order: porous ceramic matrix, porous coating and electrode heating component.
9. An atomizing assembly comprising the atomizing core of either of claims 7 or 8.
10. An electronic cigarette comprising the atomizing assembly of claim 9.
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