CN115124323B

CN115124323B - Porous ceramic heating element and preparation method thereof

Info

Publication number: CN115124323B
Application number: CN202210824974.6A
Authority: CN
Inventors: 陈家太; 周胜文; 李雪; 林云燕; 刘光烜
Original assignee: Shenzhen Smiss Technology Co Ltd
Current assignee: Shenzhen Smiss Technology Co Ltd
Priority date: 2022-07-14
Filing date: 2022-07-14
Publication date: 2023-07-04
Anticipated expiration: 2042-07-14
Also published as: CN115124323A

Abstract

The invention relates to a porous ceramic heating body and a preparation method thereof, wherein the porous ceramic heating body 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, the carbon fiber unidirectional tape and the conductive circuit are arranged, and the conductive circuit can conduct electricity for the carbon fiber unidirectional tape, so that the carbon fiber unidirectional tape generates heat, has higher thermal stability and higher temperature uniformity, is not easy to generate carbon deposition phenomenon, and ensures atomization effect; the ceramic powder can form a structural framework by adopting ceramic powder, low-temperature glass powder, a pore-forming agent, an adhesive and a surfactant, the low-temperature glass powder can be adhered to the ceramic powder, the sintering temperature is reduced, and the pore-forming agent can form pores; the surfactant can lead the pore distribution of the porous ceramic body to be even, and further ensures the atomization effect.

Description

Porous ceramic heating element and preparation method thereof

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 aerosol device is a device that produces a smokable aerosol by heating an aerosolized liquid, and is used primarily as a smoking substitute device or as a medical smoking device, typically including an aerosolization assembly, a battery assembly, and the like.

The atomizing assembly is used as a core component of the electronic atomizing device and is closely related to the atomizing effect of the whole device. At present, part of atomizing assemblies of electronic atomizing devices adopt ceramic atomizing assemblies, and the ceramic atomizing assemblies mainly comprise porous ceramic bodies and heating bodies. The heating element is usually produced by thick film printing, and the heating paste is printed and sintered on the surface of the porous ceramic body. The porous ceramic body can quickly absorb and conduct atomized liquid to the surface of the heating body due to the good lipophilicity and the porous structure of the porous ceramic body, so that the heating body can be heated and atomized to form the smokeable aerosol.

However, in the conventional ceramic atomization assembly, when the heating paste is printed on the porous ceramic body, the printing is not uniform, so that the heating body heats unevenly during working, and further, the porous ceramic body is subjected to carbon deposition after long-time use, so that blockage is easily caused, and the atomization effect is affected.

Disclosure of Invention

Based on the above, it is necessary to provide a porous ceramic heating element which is uniform in heat generation, is less likely to cause a carbon deposition phenomenon, and ensures an atomization effect, and a method for producing the same.

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 prepare 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 heating component further comprises a conductive electrode, and the conductive electrode is in unidirectional charged connection with the carbon fiber through the conductive circuit.

In one embodiment, the ceramic powder comprises one or more of diatomite, cordierite, aluminum oxide, silicon carbide, silicon nitride, quartz sand, corundum sand, glass sand, kaolin and clay.

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 powder.

In one embodiment, the adhesive comprises one or more of paraffin wax, beeswax, polyethylene wax, polypropylene wax.

In one embodiment, the surfactant comprises at least one of stearic acid and oleic acid.

The application also provides a preparation method of the porous ceramic heating element, which comprises the following steps:

weighing the ceramic powder, the low-temperature glass powder and the pore-forming agent according to parts by weight, uniformly mixing the ceramic powder, the low-temperature glass powder and the pore-forming agent, and then performing ball milling to prepare a mixture;

weighing the adhesive and the surfactant according to parts by weight, uniformly mixing the adhesive, the surfactant and the mixture, and then performing 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 prepare the heating component;

placing the heating component into a mould, pouring the raw material slurry into the mould, and performing die casting molding on the raw material slurry and the heating component to prepare a blank;

sintering the blank to prepare the porous ceramic heating body.

In one embodiment, the binder and the surfactant are mixed with the mixture uniformly, and then the mixture is put into deionized water or absolute ethyl alcohol for wet ball milling.

In one embodiment, the green body 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 body.

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 performing ball milling for 4-7 hours.

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 fiber and can generate heat and conduct heat, so that the carbon fiber unidirectional tape has higher thermal stability, good heat shock resistance and high reliability, basically has no local overheating phenomenon, has higher temperature uniformity, is not easy to generate carbon deposition phenomenon and ensures atomization effect; the raw materials of the porous ceramic body adopt ceramic powder, low-temperature glass powder, pore-forming agent, adhesive and surfactant, the ceramic powder can form a structural framework, the low-temperature glass powder can be adhered to the ceramic powder, the sintering temperature is reduced, and the pore-forming agent can form pores so as to ensure the porosity of the porous ceramic body; the surfactant can promote 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 capability of conducting atomized liquid and storing the atomized liquid of the porous ceramic body can be improved, and the atomization effect is further ensured.

Drawings

FIG. 1 is a schematic top view of a porous ceramic heating element according to an embodiment of the present invention;

FIG. 2 is a block diagram showing steps of a method for manufacturing 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 heating component; 210. a carbon fiber unidirectional tape; 220. and a conductive electrode.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" 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 are used herein for illustrative purposes only and are not meant to be the only embodiment.

The porous ceramic heating element 10 according to the embodiment of the present invention is mainly applicable to an atomization assembly of an electronic atomization device, and can be used in a liquid medicine component volatilization device or other aromatic component release devices based on the same conductive atomization liquid and atomization function, and the electronic atomization device is taken as an example in the following embodiments of the present invention.

Referring to fig. 1, an embodiment of the present invention provides a porous ceramic heating element 10, which includes a porous ceramic body 100 and a heating element 200, wherein the porous ceramic body 100 has a microporous structure therein for conducting an atomized liquid to be provided to the heating element 200. The heat generating component 200 is used to heat the atomized liquid conducted by the porous ceramic body 100 to generate an aerosol. Specifically, the heat generating component 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 this application.

The porous ceramic body 100 comprises the following raw materials in parts by weight: 200 to 250 parts of ceramic powder, 200 to 250 parts of low-temperature glass powder, 160 to 170 parts of pore-forming agent, 300 to 330 parts of adhesive and 160 to 170 parts of surfactant. The raw materials are sintered to produce porous ceramic body 100. The ceramic powder is used for forming a structural framework. 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 sintering temperature. The pore-forming agent acts to form pores. The surfactant has the function of improving the dispersion of pores in ceramic powder and low-temperature glass powder, so that the problem of poor uniformity of pore distribution of the porous ceramic body 100 prepared by using the surfactant 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 requirements. Illustratively, the ceramic powder has a particle size of 10 μm to 80 μm, the low temperature glass powder has a particle size of 5 μm to 30 μm, and the pore-forming agent has a particle size of 10 μm to 60 μm. Preferably, the particle size of the pore-forming agent is 40 μm to 60. Mu.m.

The heating element 200 is disposed on the upper surface of the porous ceramic body 100, and the heating 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,

porous ceramic body 100 has a contact surface that contacts carbon fiber unidirectional tape 210. The carbon fiber unidirectional tape 210 may generate heat to heat the atomized liquid conducted by the porous ceramic body 100. In this embodiment, the contact surface is the upper surface of the porous ceramic body 100. In other possible embodiments, the contact surface may be a lower surface of the porous ceramic body 100, or may be a 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 that are disposed opposite to each other, the electrode connection end is in contact with the conductive electrode 220, the conductive electrode 220 is capable of conducting electricity for the conductive circuit, the unidirectional tape connection end is in contact with the carbon fiber unidirectional tape 210, and the conductive circuit is capable of conducting electricity for the carbon fiber unidirectional tape 210. More specifically, the conductive electrode 220 is soldered to an electrode connection end of the conductive circuit.

A power supply and control circuit may be provided, the power supply and control circuit is electrically connected with the conductive electrode 220 through a lead, the power supply can supply power to the carbon fiber unidirectional tape 210, and the control circuit may be used for controlling the on-off of a circuit 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 in the application, and can be set according to the use requirement. Illustratively, the carbon fiber unidirectional tape 210 has a thickness of 0.08mm. Specifically, the carbon fiber unidirectional tape 210 employs carbon fibers T300 and T800.

Referring to fig. 2, in accordance with some embodiments of the present application, optionally, the ceramic powder includes, but is not limited to, one or more of diatomaceous earth, cordierite, alumina, silica, silicon carbide, silicon nitride, quartz sand, corundum sand, glass sand, kaolin, clay.

In this example, diatomaceous earth was used as the ceramic powder. The main component of diatomite is silicon dioxide (SiO ₂ ) The surface of the porous ceramic has numerous pores, and has the advantages of strong adsorption performance, light volume weight, uniform fineness, neutral and nontoxic pH value, good mixing uniformity and the like.

In another embodiment, the ceramic powder is one or more of diatomite, cordierite, aluminum oxide, silicon carbide, silicon nitride, quartz sand, corundum sand, glass sand, kaolin and clay. 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 selected from one or more of cordierite, alumina, silica, silicon carbide, silicon nitride, quartz sand, corundum sand, glass sand, kaolin, clay, and diatomaceous earth. Illustratively, quartz sand and diatomaceous earth are used as the ceramic powder.

Referring to fig. 2, in accordance with some embodiments of the present application, optionally, the pore formers include, but are 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 dust, flour, corn flour, starch, and soy flour.

In this example, polymethyl methacrylate (PMMA) was used as the pore-forming agent. The polymethyl methacrylate has higher mechanical strength: polymethyl methacrylate has a relative molecular mass of about 200 ten thousand, is a long-chain high polymer, and forms a molecular chain very soft, so that the strength of the polymethyl methacrylate is relatively high, 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 relatively low, and under the condition of oxygen, the polymethyl methacrylate starts to burn at 458 ℃, and carbon dioxide, water, carbon monoxide and some low-molecular compounds including formaldehyde are generated 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. Illustratively, the pore formers may be polymethyl methacrylate (PMMA), polypropylene (PP), and starch. The pore-forming agent can also be polystyrene (PS, polypropylene (PP) and flour).

In yet another embodiment, the pore former is 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 soy flour, and polymethyl methacrylate (PMMA). Illustratively, the pore-forming agent is polymethyl methacrylate (PMMA) and carbon powder.

Referring to fig. 2, in accordance with some embodiments of the present application, the adhesive may optionally include, but is not limited to, one or more of paraffin, beeswax, polyethylene wax, polypropylene.

In this embodiment, paraffin wax is used as the adhesive. The paraffin wax has high phase transition latent heat, almost no supercooling phenomenon, low steam pressure during melting, difficult chemical reaction, good chemical stability, small phase transition temperature and phase transition latent heat change after heat absorption for many times, self nucleation, no phase separation and corrosiveness. Paraffin has low chemical activity, neutrality and stable chemical property, and does not react with acid, nitric acid and alkaline solution under normal conditions.

In another embodiment, the adhesive comprises one or more of paraffin wax, beeswax, polyethylene wax, polypropylene wax. For example, paraffin wax, polyethylene wax, and polyethylene wax may be used as the adhesive, and 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. Illustratively, beeswax and paraffin wax are used as the adhesive.

Referring to fig. 2, optionally, in accordance with some embodiments of the present application, 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, the surfactant may be stearic acid or oleic acid, and the surfactant may be oleic acid.

Referring to fig. 1 and 2, an embodiment of the present invention provides a method for preparing a porous ceramic heating element 10, which includes the following steps:

step 1: and weighing 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 performing ball milling to prepare the mixture. The ceramic powder, the low-temperature glass powder and the pore-forming agent are more uniform through ball milling, and finally 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 measured 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, so that the ceramic powder pore-forming agent is not limited.

Step 2: and weighing the adhesive and the surfactant according to the parts by weight, uniformly mixing the adhesive, the surfactant and the mixture, and performing ball milling to prepare raw material slurry. The adhesive is heated and melted into liquid, and then the surfactant and the mixture are poured into the adhesive and cooled while stirring, 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 is heated and melted into a liquid.

By uniformly mixing the adhesive, the surfactant and the mixture, a 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 weight parts, the weight parts of the adhesive are selected from 300 to 330 parts, and the weight parts of the surfactant are selected from 30 to 40 parts.

Step 3: the carbon fiber unidirectional tape 210 is printed with conductive paste, and a conductive circuit is prepared using the conductive paste to manufacture the heating assembly 200. The process of printing the conductive paste on the carbon fiber unidirectional tape 210 may be a screen printing process or an electroplating process. In the present embodiment, the process of printing the conductive paste on the carbon fiber tape 210 adopts a screen printing process.

Step 4: the heating element 200 is placed in a mold, and then the raw material slurry is poured into the mold, and the raw material slurry and the heating element 200 are die-cast to form a blank.

Step 5: the green body is sintered to produce the porous ceramic heat-generating body 10. It is to be understood that: when the green body is sintered, not only the raw material slurry can be sintered to prepare the porous ceramic body 100, but also the heating component 200 can be formed on the porous ceramic body 100 in a sintering mode, so that the connection strength of the heating component 200 and the porous ceramic body 100 is ensured.

According to some embodiments of the present application, optionally, after the binder and surfactant are uniformly mixed with the mixture, they are placed in deionized water or absolute ethanol for wet ball milling. In this example, the binder and surfactant were mixed with the mixture uniformly and then placed in absolute ethanol for wet ball milling.

Referring to FIG. 1, according to some embodiments of the present application, optionally, the porous ceramic heating body 10 is manufactured by sintering a green body at 220-230 ℃ for 2-3 hours, and then sintering at 800-1200 ℃ for 2-4 hours. It is understood that when the green body is sintered for 2 to 3 hours at 220 to 230 ℃, the adhesive and the surfactant in the green body have lower melting points, and the adhesive is discharged out of the green body at 220 to 230 ℃. In the process of preparing the porous ceramic body 100, the surfactant and the pore-forming agent 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 7-10 hours. And uniformly mixing the adhesive, the surfactant and the mixture, and performing ball milling for 4-7 hours. Illustratively, the ceramic powder, the low temperature glass powder and the pore-forming agent are uniformly mixed and then ball-milled for 7 hours. And uniformly mixing the adhesive, the surfactant and the mixture, and performing 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 dispersing agent 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 diethyl ether acetate, diethylene glycol butyl ether acetate and ethanol. The surfactant is polyvinylpyrrolidone or lactic acid monoglyceride. The dispersant is RENTANL or REOTan LAM. The accelerator adopts a silane coupling agent. Specifically, the accelerator was a171 (vinyltrimethoxysilane), a172 (vinyltris (. Beta. -methoxyethoxy) silane)). Illustratively, the surfactant is polyvinylpyrrolidone. RENTANL is used as the dispersing agent. The organic solvent adopts diethylene glycol diethyl ether acetate. The accelerator was A171 (vinyltrimethoxysilane).

Examples:

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: and weighing ceramic powder, low-temperature glass powder and 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 the 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: and weighing the adhesive and the surfactant according to parts by weight, heating and melting the adhesive to form 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 performing ball milling for 4 hours to prepare the raw material slurry. Wherein, 300 parts of adhesive and 160 parts of surfactant are selected, the adhesive adopts paraffin wax, and the surfactant adopts stearic acid.

Step 3: the carbon fiber unidirectional tape 210 is printed with conductive paste, and a conductive circuit is prepared using the conductive paste to manufacture the heating assembly 200.

Step 5: the green body was sintered at 220℃for 2 hours and then at 800℃for 2 hours to prepare a porous ceramic heat-generating body 10.

Example 2:

this embodiment differs from embodiment 1 in that: 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 are selected.

Example 3:

this embodiment differs from embodiment 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 embodiment differs from embodiment 1 in that: and uniformly mixing the ceramic powder, the low-temperature glass powder and the pore-forming agent, and then performing ball milling for 10 hours. And uniformly mixing the adhesive, the surfactant and the mixture, and then performing ball milling for 7 hours.

Example 5:

this embodiment differs from embodiment 1 in that: the green body was sintered at 230℃for 3 hours and then at 1200℃for 3 hours to prepare the porous ceramic heat-generating body 10.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. A porous ceramic heat-generating body, characterized by comprising:

2. A porous ceramic heat-generating body as described in claim 1, wherein said heat-generating component further comprises a conductive electrode, said conductive electrode being unidirectionally electrically connected with said carbon fiber through said conductive circuit.

3. A porous ceramic heating body according to 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.

4. A porous ceramic heat-generating body according to claim 1, wherein 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 according to claim 1, wherein the binder comprises one or more of paraffin wax, beeswax, polyethylene wax, polypropylene wax.

6. A porous ceramic heat-generating body according to claim 1, wherein the surfactant comprises at least one of stearic acid and oleic acid.

7. A method for producing a porous ceramic heat-generating body according to claim 2, comprising the steps of:

sintering the blank to prepare the porous ceramic heating body.

8. The method of preparing a porous ceramic heater according to claim 7, wherein the binder and the surfactant are mixed with the mixture uniformly, and then the mixture is put into deionized water or absolute ethyl alcohol for wet ball milling.

9. The method for producing a porous ceramic heat-generating body according to claim 7, wherein the porous ceramic heat-generating body is produced by sintering the green body at 220 to 230 ℃ for 2 to 3 hours, and then at 800 to 1200 ℃ for 2 to 4 hours.

10. The method for producing a porous ceramic heat-generating body 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 performing ball milling for 4-7 hours.