CN115124323A - Porous ceramic heating element and preparation method thereof - Google Patents
Porous ceramic heating element and preparation method thereof Download PDFInfo
- Publication number
- CN115124323A CN115124323A CN202210824974.6A CN202210824974A CN115124323A CN 115124323 A CN115124323 A CN 115124323A CN 202210824974 A CN202210824974 A CN 202210824974A CN 115124323 A CN115124323 A CN 115124323A
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- Prior art keywords
- porous ceramic
- surfactant
- powder
- carbon fiber
- pore
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Links
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 52
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- 239000003795 chemical substances by application Substances 0.000 claims abstract description 36
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- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 claims description 5
- 238000005469 granulation Methods 0.000 claims description 5
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- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 5
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 5
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
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- 239000011148 porous material Substances 0.000 abstract description 16
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- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
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- 239000006185 dispersion Substances 0.000 description 2
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
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- LDVVTQMJQSCDMK-UHFFFAOYSA-N 1,3-dihydroxypropan-2-yl formate Chemical compound OCC(CO)OC=O LDVVTQMJQSCDMK-UHFFFAOYSA-N 0.000 description 1
- VXQBJTKSVGFQOL-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethyl acetate Chemical compound CCCCOCCOCCOC(C)=O VXQBJTKSVGFQOL-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 1
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- 125000003118 aryl group Chemical group 0.000 description 1
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- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
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- WOXXJEVNDJOOLV-UHFFFAOYSA-N ethenyl-tris(2-methoxyethoxy)silane Chemical compound COCCO[Si](OCCOC)(OCCOC)C=C WOXXJEVNDJOOLV-UHFFFAOYSA-N 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
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- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
- A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
- A24F40/46—Shape or structure of electric heating means
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M11/00—Sprayers or atomisers specially adapted for therapeutic purposes
- A61M11/04—Sprayers or atomisers specially adapted for therapeutic purposes operated by the vapour pressure of the liquid to be sprayed or atomised
- A61M11/041—Sprayers or atomisers specially adapted for therapeutic purposes operated by the vapour pressure of the liquid to be sprayed or atomised using heaters
- A61M11/042—Sprayers or atomisers specially adapted for therapeutic purposes operated by the vapour pressure of the liquid to be sprayed or atomised using heaters electrical
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
- C04B38/063—Preparing or treating the raw materials individually or as batches
- C04B38/0635—Compounding ingredients
- C04B38/0645—Burnable, meltable, sublimable materials
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
- C04B38/063—Preparing or treating the raw materials individually or as batches
- C04B38/0635—Compounding ingredients
- C04B38/0645—Burnable, meltable, sublimable materials
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
- C04B38/063—Preparing or treating the raw materials individually or as batches
- C04B38/0635—Compounding ingredients
- C04B38/0645—Burnable, meltable, sublimable materials
- C04B38/068—Carbonaceous materials, e.g. coal, carbon, graphite, hydrocarbons
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
- H05B3/03—Electrodes
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/141—Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/3481—Alkaline earth metal alumino-silicates other than clay, e.g. cordierite, beryl, micas such as margarite, plagioclase feldspars such as anorthite, zeolites such as chabazite
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Abstract
The invention relates to a porous ceramic heating element and a preparation method thereof, wherein the porous ceramic heating element comprises a porous ceramic body and a heating component, and the porous ceramic body comprises the following raw materials: ceramic powder, low-temperature glass powder, pore-forming agent, adhesive and surfactant; the heating component comprises a carbon fiber unidirectional tape and a conductive circuit printed on the carbon fiber unidirectional tape. According to the invention, by arranging the carbon fiber unidirectional tape and the conductive circuit, the conductive circuit can conduct electricity for the carbon fiber unidirectional tape, so that the carbon fiber unidirectional tape generates heat, the carbon fiber unidirectional tape has higher thermal stability and higher temperature uniformity, is not easy to generate carbon deposition phenomenon, and ensures the atomization effect; by adopting the ceramic powder, the low-temperature glass powder, the pore-forming agent, the adhesive and the surfactant, the ceramic powder can form a structural framework, the low-temperature glass powder can be used for bonding the ceramic powder, the sintering temperature is reduced, and the pore-forming agent can form pores; the surfactant can make the pores of the porous ceramic body uniformly distributed, and further ensure the atomization effect.
Description
Technical Field
The invention relates to the technical field of electronic atomization devices, in particular to a porous ceramic heating body and a preparation method thereof.
Background
An electronic atomizer is a device that generates a smokable aerosol by heating an atomized liquid, primarily for use as a smoking substitute device or medical smoking device, and typically includes an atomizing assembly, a battery assembly, and the like.
The atomization component is taken as a core component of the electronic atomization device and is closely related to the atomization effect of the whole device. At present, the atomizing component of part of electronic atomizing devices adopts a ceramic atomizing component which mainly comprises a porous ceramic body and a heating body. The heating element is generally formed by printing a heating paste on the surface of a porous ceramic body by thick-film printing. The porous ceramic body can rapidly absorb and conduct the atomized liquid to the surface of the heating body due to good lipophilicity and porous structure of the porous ceramic body, so that the heating body can be heated and atomized to form the aerosol which can be sucked.
However, in the existing ceramic atomization assembly, when the heating slurry is printed on the porous ceramic body, the phenomenon of uneven printing is easily caused, so that the heating body generates heat unevenly when working, and further the porous ceramic body generates carbon deposition after being used for a long time, thereby easily causing blockage and influencing the atomization effect.
Disclosure of Invention
Therefore, a porous ceramic heating element which can uniformly generate heat, is not easy to generate carbon deposition phenomenon and ensures the atomization effect and a preparation method thereof are needed.
A porous ceramic heat-generating body comprising:
the porous ceramic body comprises the following raw materials in parts by weight: 200-250 parts of ceramic powder, 200-250 parts of low-temperature glass powder, 160-170 parts of pore-forming agent, 300-330 parts of adhesive and 160-170 parts of surfactant, and sintering the raw materials to obtain the porous ceramic body;
the heating component is arranged on the upper surface of the porous ceramic body and comprises a carbon fiber unidirectional tape and a conductive circuit printed on the carbon fiber unidirectional tape.
In one embodiment, the heat generating component further comprises a conductive electrode, and the conductive electrode is in one-way charged connection with the carbon fiber through the conductive circuit.
In one embodiment, the ceramic powder comprises one or more of diatomite, cordierite, alumina, silica, silicon carbide, silicon nitride, quartz sand, corundum sand, glass sand, kaolin, clay and spray granulation.
In one embodiment, the pore-forming agent comprises one or more of polystyrene, polymethyl methacrylate, polyurethane, polypropylene, polyvinyl chloride, carbon powder, carbonate, nitrate, ammonium salt, wood dust, flour, corn flour, starch and bean flour.
In one embodiment, the adhesive comprises one or more of paraffin wax, beeswax, polyethylene wax, and polypropylene wax.
In one embodiment, the surfactant comprises at least one of stearic acid, oleic acid.
The application also provides a preparation method of the porous ceramic heating element, which comprises the following steps:
taking the ceramic powder, the low-temperature glass powder and the pore-forming agent according to the weight parts, uniformly mixing the ceramic powder, the low-temperature glass powder and the pore-forming agent, and then carrying out ball milling to prepare a mixture;
weighing the adhesive and the surfactant according to parts by weight, uniformly mixing the adhesive and the surfactant with the mixture, and then carrying out ball milling to prepare raw material slurry;
printing conductive paste on the carbon fiber unidirectional tape, and preparing the conductive circuit by using the conductive paste to manufacture the heating component;
putting the heating component into a mould, pouring the raw material slurry into the mould, and carrying out die-casting molding on the raw material slurry and the heating component to prepare a blank;
and sintering the blank to prepare the porous ceramic heating body.
In one embodiment, the adhesive and the surfactant are uniformly mixed with the mixture, and then the mixture is placed in deionized water or absolute ethyl alcohol for wet ball milling treatment.
In one embodiment, the blank is sintered for 2 to 3 hours at 220 to 230 ℃ and then sintered for 2 to 4 hours at 800 to 1200 ℃ to prepare the porous ceramic heating element.
In one embodiment, the ceramic powder, the low-temperature glass powder and the pore-forming agent are uniformly mixed and then ball-milled for 7-10 hours; and uniformly mixing the adhesive, the surfactant and the mixture, and then carrying out ball milling for 4-7 h.
In the scheme, the carbon fiber unidirectional tape and the conductive circuit are arranged, the conductive circuit can conduct electricity for the carbon fiber unidirectional tape, so that the carbon fiber unidirectional tape generates heat, and the carbon fiber unidirectional tape is made of carbon fibers and can generate heat and conduct heat, so that the carbon fiber unidirectional tape has high thermal stability, good thermal shock resistance and high reliability, does not basically have a local overheating phenomenon, has high temperature uniformity, is not easy to generate a carbon deposition phenomenon, and ensures an atomization effect; the raw materials of the porous ceramic body adopt ceramic powder, low-temperature glass powder, a pore-forming agent, a bonding agent and a surfactant, the ceramic powder can form a structural framework, the low-temperature glass powder can bond the ceramic powder, the sintering temperature is reduced, the pore-forming agent can form pores, and the porosity of the porous ceramic body is ensured; the surfactant can improve the dispersion of pores in the ceramic powder and the low-temperature glass powder, so that the pores of the porous ceramic body are uniformly distributed, the capacities of the porous ceramic body for conducting atomized liquid and storing the atomized liquid can be improved, and the atomization effect is further ensured.
Drawings
FIG. 1 is a plan view of a porous ceramic heating element according to an embodiment of the present invention;
FIG. 2 is a block diagram showing the steps of a method for producing a porous ceramic heating element according to an embodiment of the present invention.
Description of the reference numerals
10. A porous ceramic heating element; 100. a porous ceramic body; 200. a heat generating component; 210. a carbon fiber unidirectional tape; 220. and a conductive electrode.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the 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 and operated in a particular orientation, and are not to be considered limiting of the 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 at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
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 intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
The porous ceramic heating element 10 of the embodiment of the present invention is mainly applicable to an atomizing assembly of an electronic atomizing device, and can be extended to be used in a liquid medicine component volatilization device or other aromatic component release devices based on the same conductive atomizing liquid and atomizing function.
Referring to fig. 1, an embodiment of the present invention provides a porous ceramic heating element 10, including a porous ceramic body 100 and a heating element 200, wherein the porous ceramic body 100 has a micro-pore structure therein for conducting atomized liquid to the heating element 200. The heating element 200 is used to heat the atomized liquid conducted by the porous ceramic body 100 to generate an aerosol. Specifically, the heating element 200 may be formed on the porous ceramic body 100 by sintering, printing, coating, etching, or the like, or may be assembled on the porous ceramic body 100 as a separate component, which is not limited in the present application.
The porous ceramic body 100 comprises the following raw materials in parts by weight: 200 to 250 portions of ceramic powder, 200 to 250 portions of low-temperature glass powder, 160 to 170 portions of pore-forming agent, 300 to 330 portions of adhesive and 160 to 170 portions of surfactant. The raw materials are sintered to produce the porous ceramic body 100. The ceramic powder functions to form a structural skeleton. The softening temperature of the low-temperature glass powder is 320-340 ℃, the sintering temperature is 360-380 ℃, and the expansion coefficient is 90-100. The low-temperature glass powder has the functions of bonding ceramic powder and reducing the sintering temperature. The pore former acts to form pores. The surfactant has the function of improving the dispersion of pores in the ceramic powder and the low-temperature glass powder, so that the problem of poor pore distribution uniformity of the porous ceramic body 100 prepared by the surfactant due to poor pore dispersibility is solved.
Specifically, the particle sizes of the ceramic powder, the low-temperature glass powder and the pore-forming agent are not limited in the application and can be set according to the use requirement. Illustratively, the particle size of the ceramic powder is 10 to 80 μm, the particle size of the low-temperature glass powder is 5 to 30 μm, and the particle size of the pore-forming agent is 10 to 60 μm. Preferably, the pore former has a particle size of 40 to 60 μm.
The heat generating element 200 is disposed on the upper surface of the porous ceramic body 100, and the heat generating element 200 includes a carbon fiber unidirectional tape 210 and a conductive circuit printed on the carbon fiber unidirectional tape 210. Specifically, the carbon fiber unidirectional tape 210 may be a regular shape, such as a rectangle, a circle, or an irregular shape, such as a polygon. The present application is not limited in this regard,
the porous ceramic body 100 has a contact surface with the carbon fiber unidirectional tape 210. The unidirectional tape 210 of carbon fibers may generate heat to heat the atomized liquid conducted by the porous ceramic body 100. In the present embodiment, the contact surface is the upper surface of the porous ceramic body 100. In other possible embodiments, the contact surface may be the lower surface of the porous ceramic body 100 or the side surface of the porous ceramic body 100.
Referring to fig. 1, according to some embodiments of the present application, optionally, the heat generating component 200 further includes a conductive electrode 220, and the conductive electrode 220 is electrically connected to the carbon fiber unidirectional tape 210 through a conductive circuit. Specifically, the conductive circuit has an electrode connection end and a unidirectional tape connection end which are oppositely arranged, the electrode connection end is in contact with the conductive electrode 220, the conductive electrode 220 can be conductive for the conductive circuit, the unidirectional tape connection end is in contact with the carbon fiber unidirectional tape 210, and the conductive circuit can be conductive for the carbon fiber unidirectional tape 210. More specifically, the conductive electrode 220 is soldered to an electrode connection terminal of the conductive circuit.
A power supply and a control circuit can be arranged, the power supply and the control circuit are electrically connected with the conductive electrode 220 through leads, the power supply can supply power to the carbon fiber unidirectional tape 210, and the control circuit can be used for controlling the connection and disconnection of circuits between the power supply and the carbon fiber unidirectional tape 210.
The thickness of the carbon fiber unidirectional tape 210 is 0.08mm-0.1mm, and the thickness of the carbon fiber unidirectional tape 210 is not limited by the application and can be set according to the use requirement. Illustratively, carbon fiber unidirectional tape 210 has a thickness of 0.08 mm. Specifically, carbon fiber unidirectional tape 210 employs carbon fibers T300 and carbon fibers T800.
Referring to fig. 2, according to some embodiments of the present application, the ceramic powder optionally includes one or more of, but is not limited to, diatomaceous earth, cordierite, alumina, silica, silicon carbide, silicon nitride, quartz sand, corundum sand, glass sand, kaolin, clay, and spray granulation.
In this embodiment, diatomaceous earth is used as the ceramic powder. The main component of diatomite is silicon dioxide (SiO) 2 ) The surface has numerous pores, and has the advantages of strong adsorption property, light volume weight, uniform fineness, neutral pH value, no toxicity, good mixing uniformity and the like.
In another embodiment, the ceramic powder is one or more of diatomite, cordierite, alumina, silica, silicon carbide, silicon nitride, quartz sand, corundum sand, glass sand, kaolin, clay and spray granulation. For example, diatomaceous earth, alumina, and silicon carbide may be used as the ceramic powder. The ceramic powder can also adopt alumina, silicon oxide, silicon carbide and quartz sand.
In yet another embodiment, the ceramic powder is one or more selected from cordierite, alumina, silica, silicon carbide, silicon nitride, quartz sand, corundum sand, glass sand, kaolin, clay, spray granulation, and diatomite. Illustratively, quartz sand and diatomite are used as the ceramic powder.
Referring to fig. 2, according to some embodiments of the present application, the pore-forming agent optionally includes, but is not limited to, one or more of Polystyrene (PS), polymethyl methacrylate (PMMA), Polyurethane (PU), polypropylene (PP), polyvinyl chloride (PVC), carbon powder, carbonate, nitrate, ammonium salt, wood flour, corn flour, starch, and bean flour.
In this example, polymethyl methacrylate (PMMA) was used as the pore former. The mechanical strength of polymethyl methacrylate is high: the polymethyl methacrylate has the relative molecular mass of about 200 ten thousand, is a long-chain high molecular polymer, and forms a molecule chain which is very soft, so that the strength of the polymethyl methacrylate is higher, the tensile resistance and the impact resistance are 7-18 times higher than those of common glass, the melting point of the polymethyl methacrylate is lower, and in the presence of oxygen, the polymethyl methacrylate starts to burn at 458 ℃ to generate carbon dioxide, water, carbon monoxide and some low molecular compounds including formaldehyde after burning.
In another embodiment, the pore-forming agent is one or more of Polystyrene (PS), polymethyl methacrylate (PMMA), Polyurethane (PU), polypropylene (PP), polyvinyl chloride (PVC), carbon powder, carbonate, nitrate, ammonium salt, wood dust, flour, corn flour, starch, and bean flour. For example, polymethyl methacrylate (PMMA), polypropylene (PP), and starch may be used as the pore-forming agent. The pore-forming agent can also be polystyrene (PS, polypropylene (PP) or flour.
In yet another embodiment, the pore-forming agent is selected from one or more of Polystyrene (PS), Polyurethane (PU), polypropylene (PP), polyvinyl chloride (PVC), carbon powder, carbonate, nitrate, ammonium salt, wood dust, flour, corn flour, starch and bean flour, and polymethyl methacrylate (PMMA). For the pore former, polymethyl methacrylate (PMMA) and carbon powder are used as an example.
Referring to fig. 2, according to some embodiments of the present application, the adhesive may optionally include one or more of paraffin, beeswax, polyethylene wax, and polypropylene.
In this embodiment, paraffin wax is used as the binder. The paraffin has high phase change latent heat, almost no supercooling phenomenon, low steam pressure during melting, difficult chemical reaction, good chemical stability, small change of phase change temperature and phase change latent heat after repeated heat absorption and release, self-nucleation, no phase separation and no corrosivity. The paraffin wax has low chemical activity, is neutral, has stable chemical property, and does not react with acid except nitric acid and alkaline solution under common conditions.
In another embodiment, the adhesive comprises one or more of paraffin wax, beeswax, polyethylene wax, polypropylene wax. For example, paraffin wax, polyethylene wax, or polyethylene wax may be used as the adhesive.
In yet another embodiment, the adhesive comprises one or more of beeswax, polyethylene wax, polypropylene wax, and paraffin wax. For example, beeswax and paraffin wax are used as the adhesive.
Referring to fig. 2, according to some embodiments of the present application, optionally, the surfactant includes, but is not limited to, at least one of stearic acid, oleic acid. In this example, stearic acid was used as the surfactant. In other embodiments, stearic acid and oleic acid may be used as the surfactant, and oleic acid may also be used as the surfactant.
Referring to fig. 1 and 2, an embodiment of the present invention provides a method for preparing a porous ceramic heating element 10, including the steps of:
step 1: ceramic powder, low-temperature glass powder and a pore-forming agent are weighed according to the weight parts, and are uniformly mixed and then subjected to ball milling to prepare a mixture. The ceramic powder, the low-temperature glass powder and the pore-forming agent are more uniform through ball milling, and finally, a uniform mixture can be obtained. It is to be understood that: when the ceramic powder, the low-temperature glass powder and the pore-forming agent are taken according to the weight parts, the weight parts of the ceramic powder are selected from 200 to 250 parts, the weight parts of the low-temperature glass powder are selected from 200 to 250 parts, and the weight parts of the pore-forming agent are selected from 160 to 170 parts, which is not limited in the application.
And 2, step: weighing the adhesive and the surfactant according to the parts by weight, uniformly mixing the adhesive and the surfactant with the mixture, and then carrying out ball milling to prepare the raw material slurry. The adhesive is heated and melted into liquid, and then the surfactant and the mixture are poured into the adhesive and stirred and cooled so that the adhesive, the surfactant and the mixture are uniformly mixed. It should be noted that: the temperature at which the adhesive is heated is not limited in this application as long as the adhesive can be heated and melted into a liquid.
The adhesive, the surfactant and the mixture are uniformly mixed, so that uniform raw material slurry can be finally obtained. It is to be understood that: when the adhesive and the surfactant are measured according to the parts by weight, the parts by weight of the adhesive is selected from 300 to 330 parts, and the parts by weight of the surfactant is selected from 30 to 40 parts.
And step 3: the carbon fiber unidirectional tape 210 is printed with conductive paste, and a conductive circuit is prepared using the conductive paste to form the heating element 200. The process of printing the conductive paste on the carbon fiber unidirectional tape 210 may adopt a screen printing process or an electroplating process. In the present embodiment, the process of printing the conductive paste on the carbon fiber unidirectional tape 210 employs a screen printing process.
And 4, step 4: the heating element 200 is placed in a mold, the raw material slurry is poured into the mold, and the raw material slurry and the heating element 200 are molded by die casting to form a blank.
And 5: the green body is sintered to produce the porous ceramic heating element 10. It is to be understood that: when the green body is sintered, not only the raw material slurry can be sintered to form the porous ceramic body 100, but also the heating element 200 can be formed on the porous ceramic body 100 by sintering, thereby ensuring the connection strength between the heating element 200 and the porous ceramic body 100.
According to some embodiments of the present disclosure, optionally, after the binder and the surfactant are uniformly mixed with the mixture, the mixture is placed in deionized water or absolute ethyl alcohol for wet ball milling treatment. In this example, the binder and the surfactant were mixed with the mixture, and then the mixture was subjected to wet ball milling in absolute ethanol.
Referring to fig. 1, according to some embodiments of the present application, the green body is optionally sintered at 220-230 ℃ for 2-3 h, and then sintered at 800-1200 ℃ for 2-4 h to form the porous ceramic heating element 10. It is understood that when the blank is sintered for 2 to 3 hours at 220 to 230 ℃, the adhesive is discharged out of the blank at 220 to 230 ℃ due to the low melting point of the adhesive and the surfactant in the blank. In the preparation process of the porous ceramic body 100, the surfactant and the pore former are all vaporized and volatilized, so that the finally prepared porous ceramic body 100 only comprises ceramic powder and low-temperature glass powder.
According to some embodiments of the present application, optionally, the ceramic powder, the low-temperature glass powder and the pore-forming agent are uniformly mixed and then ball-milled for 7 to 10 hours. Uniformly mixing the adhesive, the surfactant and the mixture, and then performing ball milling for 4-7 hours. Illustratively, ceramic powder, low-temperature glass powder and pore-forming agent are uniformly mixed and then ball-milled for 7 hours. And uniformly mixing the adhesive, the surfactant and the mixture, and then carrying out ball milling for 4 hours.
Referring to fig. 1, according to some embodiments of the present application, optionally, the conductive paste includes the following components by weight: 80-85 parts of flake silver powder, 10-15 parts of glass powder, 10-15 parts of organic solvent, 0.6-1.2 parts of surfactant, 0.5-1.5 parts of dispersant and 0.8-1.2 parts of accelerator.
More specifically, the purity of the plate-like silver powder is greater than 99.99%. The organic solvent comprises at least one of ethyl acetate, dioctyl phthalate, diethylene glycol ethyl ether acetate, diethylene glycol butyl ether acetate and ethanol. The surfactant is polyvinylpyrrolidone or lactic acid monoglyceride. The dispersant is RENTANAL or Reotan LAM. The accelerator adopts silane coupling agent. Specifically, as the accelerator, a171 (vinyltrimethoxysilane), a172 (vinyltris (. beta. -methoxyethoxy) silane)) was used. Illustratively, the surfactant is polyvinylpyrrolidone. RENTANAL is used as the dispersant. The organic solvent adopts diethylene glycol ethyl ether acetate. The accelerator used was A171 (vinyltrimethoxysilane).
Example (b):
the present disclosure is more particularly described in the following examples that are intended as illustrations only, since various modifications and changes within the scope of the present disclosure will be apparent to those skilled in the art.
Example 1:
step 1: weighing ceramic powder, low-temperature glass powder and a pore-forming agent according to the weight parts, uniformly mixing the ceramic powder, the low-temperature glass powder and the pore-forming agent, and performing ball milling for 7 hours to prepare a mixture. Wherein, 200 parts of ceramic powder, 200 parts of low-temperature glass powder and 160 parts of pore-forming agent are selected. Specifically, diatomite is adopted as the ceramic powder, and polymethyl methacrylate (PMMA) is adopted as the pore-forming agent.
Step 2: weighing the adhesive and the surfactant according to parts by weight, heating and melting the adhesive into liquid, pouring the mixture and the surfactant into the adhesive, stirring and cooling the mixture, uniformly mixing the adhesive, the surfactant and the mixture, and then performing ball milling for 4 hours to prepare raw material slurry. Wherein, 300 parts of adhesive and 160 parts of surfactant are selected, the adhesive adopts paraffin, and the surfactant adopts stearic acid.
And step 3: the carbon fiber unidirectional tape 210 is printed with conductive paste, and a conductive circuit is prepared using the conductive paste to form the heating element 200.
And 4, step 4: the heating element 200 is placed in a mold, the raw material slurry is poured into the mold, and the raw material slurry and the heating element 200 are molded by die casting to form a blank.
And 5: the blank is sintered for 2 hours at 220 ℃ and then sintered for 2 hours at 800 ℃ to prepare the porous ceramic heating element 10.
Example 2:
the present example differs from example 1 in that: selecting 250 parts of ceramic powder, 250 parts of low-temperature glass powder, 170 parts of pore-forming agent, 330 parts of adhesive and 170 parts of surfactant.
Example 3:
this example differs from example 1 in that: 230 parts of ceramic powder, 220 parts of low-temperature glass powder, 165 parts of pore-forming agent, 320 parts of adhesive and 165 parts of surfactant are selected.
Example 4:
this example differs from example 1 in that: and uniformly mixing the ceramic powder, the low-temperature glass powder and the pore-forming agent, and then carrying out ball milling for 10 hours. And uniformly mixing the adhesive, the surfactant and the mixture, and then carrying out ball milling for 7 hours.
Example 5:
this example differs from example 1 in that: the blank is sintered for 3 hours at 230 ℃ and then sintered for 3 hours at 1200 ℃ to prepare the porous ceramic heating element 10.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A porous ceramic heat-generating body characterized by comprising:
the porous ceramic body comprises the following raw materials in parts by weight: 200-250 parts of ceramic powder, 200-250 parts of low-temperature glass powder, 160-170 parts of pore-forming agent, 300-330 parts of adhesive and 160-170 parts of surfactant, wherein the porous ceramic body is prepared by sintering the raw materials;
the heating component is arranged on the upper surface of the porous ceramic body and comprises a carbon fiber unidirectional tape and a conductive circuit printed on the carbon fiber unidirectional tape.
2. A porous ceramic heat-generating body as described in claim 1, wherein said heat-generating component further comprises a conductive electrode which is unidirectionally electrically connected with said carbon fiber through said conductive circuit.
3. A porous ceramic heat-generating body as described in claim 1, wherein the ceramic powder comprises one or more of diatomaceous earth, cordierite, alumina, silica, silicon carbide, silicon nitride, quartz sand, corundum sand, glass sand, kaolin, clay, and spray granulation.
4. A porous ceramic heat-generating body as described in claim 1, characterized in that the pore-forming agent comprises one or more of polystyrene, polymethyl methacrylate, polyurethane, polypropylene, polyvinyl chloride, carbon powder, carbonate, nitrate, ammonium salt, wood dust, flour, corn flour, starch and bean flour.
5. A porous ceramic heat-generating body as described in claim 1, wherein said adhesive agent comprises one or more of paraffin wax, beeswax, polyethylene wax, polypropylene wax.
6. A porous ceramic heat-generating body as described in claim 1, characterized in that the surfactant comprises at least one of stearic acid, oleic acid.
7. A production method of a porous ceramic heat-generating body as described in claim 2, characterized by comprising the steps of:
taking the ceramic powder, the low-temperature glass powder and the pore-forming agent according to the weight parts, uniformly mixing the ceramic powder, the low-temperature glass powder and the pore-forming agent, and then carrying out ball milling to prepare a mixture;
weighing the adhesive and the surfactant according to parts by weight, uniformly mixing the adhesive and the surfactant with the mixture, and then carrying out ball milling to prepare raw material slurry;
printing conductive paste on the carbon fiber unidirectional tape, and preparing the conductive circuit by using the conductive paste to manufacture the heating component;
putting the heating component into a mould, pouring the raw material slurry into the mould, and carrying out die-casting molding on the raw material slurry and the heating component to prepare a blank;
and sintering the blank to prepare the porous ceramic heating body.
8. A method for producing a porous ceramic heat-generating body as described in claim 7, characterized in that after the binder and the surfactant are uniformly mixed with the mixture, it is placed in deionized water or absolute ethyl alcohol to be subjected to wet ball milling treatment.
9. A method of producing a porous ceramic heat-generating body as described in claim 7, characterized in that the green body is sintered at 220 ℃ to 230 ℃ for 2 hours to 3 hours and then sintered at 800 ℃ to 1200 ℃ for 2 hours to 4 hours to produce the porous ceramic heat-generating body.
10. The method for preparing a porous ceramic heating element according to claim 7, characterized in that the ceramic powder, the low-temperature glass powder and the pore-forming agent are uniformly mixed and then ball-milled for 7 to 10 hours; and uniformly mixing the adhesive, the surfactant and the mixture, and then carrying out ball milling for 4-7 h.
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