阅读说明：本技术 多孔陶瓷发热体及其制备方法 (porous ceramic heating element and preparation method thereof ) 是由 刘伟 于 2019-09-25 设计创作，主要内容包括：本发明实施例提出一种多孔陶瓷发热体及其制备方法,属于陶瓷发热体技术领域。该制备方法包括：提取第一原料：骨料40-80wt％、粘结剂8-20wt％和造孔剂12-50wt％；将第一原料研磨均匀混合,获得混合料；将混合料进行造粒,并放置于密闭环境陈腐第一预设时间,获得第一物料；将第一物料压制成目标坯体；提取第二原料：金属粉末70-95wt％和有机载体5-30wt％；将第二原料均匀混合以制备金属浆料；将金属浆料印刷于目标坯体,获得待烧结坯体；将待烧结坯体按预设加温步骤进行烧结。发热元件和多孔陶瓷基体是在经烧结之后而形成,从而增强了发热元件和多孔陶瓷基体之间的稳固性,以及使得发热元件和多孔陶瓷基体之间贴合紧密。(The embodiment of the invention provides a porous ceramic heating element and a preparation method thereof, belonging to the technical field of ceramic heating elements. The preparation method comprises the following steps: extracting a first raw material: 40-80 wt% of aggregate, 8-20 wt% of binder and 12-50 wt% of pore-forming agent; grinding and uniformly mixing the first raw material to obtain a mixture; granulating the mixture, and placing the mixture in a closed environment for a first preset time to obtain a first material; pressing the first material into a target blank body; extracting a second raw material: 70-95 wt% of metal powder and 5-30 wt% of organic carrier; uniformly mixing the second raw material to prepare metal slurry; printing the metal slurry on a target blank to obtain a blank to be sintered; and sintering the green body to be sintered according to a preset heating step. The heating element and the porous ceramic base are formed after being sintered, thereby enhancing the stability between the heating element and the porous ceramic base and allowing the close adhesion between the heating element and the porous ceramic base.)

1. A method for preparing a porous ceramic heating element is characterized by comprising the following steps:

Extracting a first feedstock, the first feedstock comprising: 40-80 wt% of aggregate, 8-20 wt% of binder and 12-50 wt% of pore-forming agent;

Grinding and uniformly mixing the first raw material to obtain a mixture;

granulating the mixture, and placing the mixture in a closed environment for a first preset time to obtain a first material;

pressing the first material into a target green body;

Extracting a second feedstock, the second feedstock comprising: 70-95 wt% of metal powder and 5-30 wt% of organic carrier;

uniformly mixing the second raw material to prepare a metal slurry;

Printing the metal slurry on the target blank to obtain a blank to be sintered;

And sintering the green body to be sintered according to a preset heating step.

2. A method for preparing a porous ceramic heating element as described in claim 1, wherein said aggregate is one or more of silicon carbide, silicon nitride, alumina and quartz;

the binder is one or more of alumina, kaolin, feldspar and quartz;

the pore-forming agent is one or more of graphite, starch, carbon black and paraffin;

The metal powder is one or more of a mixture of tungsten powder and molybdenum powder, a mixture of silver powder and palladium powder and a mixture of platinum powder and rhodium powder;

the organic vehicle includes: 80-96 wt% of terpineol, 3-17 wt% of ethyl cellulose and 0.5-3 wt% of absolute ethyl alcohol.

3. The method of producing a porous ceramic heat-generating body as described in claim 1, wherein the step of granulating the mixture material comprises:

And pouring the mixture into a mortar, adding 2-7 wt% of polyvinyl alcohol into the mixture, uniformly mixing, and granulating.

4. The method of producing a porous ceramic heat-generating body as described in claim 1, wherein the step of pressing the first material into a target green body comprises:

Pressing and forming the first material into a preset model, wherein the forming pressure is changed from small to large until reaching a limit pressure value of 3-5.5KN, and then keeping for a second preset time;

And placing the formed preset model in an oven at the temperature of 90-110 ℃ for drying treatment to obtain the target blank.

5. the method of producing a porous ceramic heat-generating body as described in claim 1, wherein the step of printing the metal paste on the target green body to obtain a green body to be sintered includes:

Printing the metal slurry with the viscosity of 15-30 Pa-s on the surface of the target blank;

Partially covering a pre-cast green body with the metal slurry;

And carrying out hot pressing treatment on the preset casting green body so as to fixedly arrange the preset casting green body on the target green body, thereby obtaining the green body to be sintered.

6. a method of producing a porous ceramic heat-generating body as described in claim 5, wherein a hot-pressing working temperature of said hot-pressing treatment is 40 to 60 ℃ and a hot-pressing pressure is 9 to 12 MPa.

7. the method for producing a porous ceramic heat-generating body as described in claim 1, wherein the step of sintering the green body to be sintered in accordance with a preset heating step comprises:

Placing the green body to be sintered in a glue discharging area for glue discharging treatment for 2-7 h;

Placing the green body to be sintered after the binder removal treatment in a heating area for heating treatment, wherein the temperature is kept at 1200-1600 ℃ for 1-3 h;

And placing the blank to be sintered after temperature rise treatment in a cooling zone for temperature reduction treatment for 2-7 h.

8. a production method of a porous ceramic heat-generating body as described in claim 7, characterized in that the green body to be sintered is subjected to a gel removal treatment process, a temperature rise treatment process and a temperature decrease treatment process, respectively, under a wet hydrogen atmosphere.

9. a porous ceramic heating element characterized by being produced by the production method for a porous ceramic heating element according to any one of claims 1 to 8.

10. a porous ceramic heating element is characterized by comprising a porous ceramic matrix and a heating element printed on the porous ceramic matrix;

The porous ceramic matrix includes: 40-80 wt% of aggregate, 8-20 wt% of binder and 12-50 wt% of pore-forming agent;

The heat generating element includes: 70-95 wt% of metal powder and 5-30 wt% of organic carrier.

Technical Field

the embodiment of the invention relates to the technical field of ceramic heating elements, in particular to a porous ceramic heating element applicable to an electronic smoking set and a preparation method thereof.

Background

In some electronic smoking article products, the porous ceramic is used for adsorbing the tobacco tar to the heating wire, and the tobacco tar is heated and atomized under the electric heating action of the heating wire.

At present, because the heater sets up in porous ceramic's the outside, not only make the steadiness between heater and the porous ceramic poor, connect between heater and the porous ceramic not inseparable moreover, lead to having great temperature difference between heater and the porous ceramic, thereby have the space between heater and the porous ceramic promptly and lead to the technical problem such as the difference in temperature is big, heat conductivility is poor and heating control temperature process is inaccurate.

Disclosure of Invention

the embodiment of the invention aims to provide a porous ceramic heating element and a preparation method thereof, which can solve the technical problem of poor heat conduction performance caused by the untight connection between a heating element and a porous ceramic substrate in the prior art.

the embodiment of the invention adopts the following technical scheme:

The embodiment of the invention provides a preparation method of a porous ceramic heating body, which comprises the following steps:

extracting a first feedstock, the first feedstock comprising: 40-80 wt% of aggregate, 8-20 wt% of binder and 12-50 wt% of pore-forming agent;

grinding and uniformly mixing the first raw material to obtain a mixture;

granulating the mixture, and placing the mixture in a closed environment for a first preset time to obtain a first material;

Pressing the first material into a target green body;

extracting a second feedstock, the second feedstock comprising: 70-95 wt% of metal powder and 5-30 wt% of organic carrier;

uniformly mixing the second raw material to prepare a metal slurry;

printing the metal slurry on the target blank to obtain a blank to be sintered;

And sintering the green body to be sintered according to a preset heating step.

Optionally, the aggregate is one or more of silicon carbide, silicon nitride, alumina and quartz;

The binder is one or more of alumina, kaolin, feldspar and quartz;

The pore-forming agent is one or more of graphite, starch, carbon black and paraffin;

the metal powder is one or more of a mixture of tungsten powder and molybdenum powder, a mixture of silver powder and palladium powder and a mixture of platinum powder and rhodium powder;

the organic vehicle includes: 80-96 wt% of terpineol, 3-17 wt% of ethyl cellulose and 0.5-3 wt% of absolute ethyl alcohol.

optionally, the step of granulating the mixture comprises:

And pouring the mixture into a mortar, adding 2-7 wt% of polyvinyl alcohol into the mixture, uniformly mixing, and granulating.

optionally, the step of pressing the first material into a target green body comprises:

pressing and forming the first material into a preset model, wherein the forming pressure is changed from small to large until reaching a limit pressure value of 3-5.5KN, and then keeping for a second preset time;

and placing the formed preset model in an oven at the temperature of 90-110 ℃ for drying treatment to obtain the target blank.

Optionally, the step of printing the metal slurry on the target blank to obtain a blank to be sintered includes:

Printing the metal slurry with the viscosity of 15-30 Pa-s on the surface of the target blank;

Partially covering a pre-cast green body with the metal slurry;

and carrying out hot pressing treatment on the preset casting green body so as to fixedly arrange the preset casting green body on the target green body, thereby obtaining the green body to be sintered.

Optionally, the hot-pressing working temperature of the hot-pressing treatment is 40-60 ℃, and the hot-pressing pressure is 9-12 MPa.

optionally, the sintering the green body to be sintered according to a preset heating step includes:

placing the green body to be sintered in a glue discharging area for glue discharging treatment for 2-7 h;

Placing the green body to be sintered after the binder removal treatment in a heating area for heating treatment, wherein the temperature is kept at 1200-1600 ℃ for 1-3 h;

and placing the blank to be sintered after temperature rise treatment in a cooling zone for temperature reduction treatment for 2-7 h.

Optionally, the green body to be sintered is subjected to a glue removal treatment process, a heating treatment process and a cooling treatment process under a wet hydrogen atmosphere.

in addition, the embodiment of the invention also provides a porous ceramic heating element, and the porous ceramic heating element is prepared by the preparation method of the porous ceramic heating element.

in addition, the embodiment of the invention also provides a porous ceramic heating body, which comprises a porous ceramic substrate and a heating element printed on the porous ceramic substrate;

The porous ceramic matrix includes: 40-80 wt% of aggregate, 8-20 wt% of binder and 12-50 wt% of pore-forming agent;

The heat generating element includes: 70-95 wt% of metal powder and 5-30 wt% of organic carrier.

compared with the prior art, in the preparation method of the porous ceramic heating element according to the embodiment, the metal slurry is printed on the target blank and sintered to form the porous ceramic heating element, wherein the target blank forms a porous ceramic matrix after being sintered, and the metal slurry forms a heating element after being sintered. The heating element and the porous ceramic base body are formed after sintering and are fixedly arranged in a whole, so that the stability between the heating element and the porous ceramic base body is enhanced, the heating element and the porous ceramic base body are tightly attached, the heat energy of the heating element can be fully conducted to the porous ceramic base body, the temperature difference between the heating element and the porous ceramic base body is small, the heat energy utilization rate is improved, and the temperature control process is more accurate.

drawings

FIG. 1 is a schematic view showing a structure of a porous ceramic heat-generating body provided in one embodiment of the present invention;

FIG. 2 is a schematic flow chart of a method for producing a porous ceramic heating element according to an embodiment of the present invention.

Detailed Description

In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. It will be understood that when an element is referred to as being "secured to" 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 be present. As used in this specification, the terms "upper," "lower," "inner," "outer," "vertical," "horizontal," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and simplicity in description, and do not indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operated in a particular orientation, and are not to be considered limiting of the 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 relative importance.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Referring to fig. 1, an embodiment of the present invention provides a porous ceramic heating element 100, where the porous ceramic heating element 100 includes a porous ceramic substrate 10 and a heating element 20, and the heating element 20 is printed on the porous ceramic substrate 10.

the porous ceramic matrix 10 includes a first raw material: 40-80 wt% of aggregate, 8-20 wt% of binder and 12-50 wt% of pore-forming agent. Wherein the aggregate is one or more of silicon carbide, silicon nitride, alumina and quartz; the binder is one or more of alumina, kaolin, feldspar and quartz, and the pore-forming agent is one or more of graphite, starch, carbon black and paraffin.

the heating element 20 comprises a second raw material: 70-95 wt% of metal powder and 5-30 wt% of organic carrier. The metal powder is one or more of a mixture of tungsten powder and molybdenum powder, a mixture of silver powder and palladium powder and a mixture of platinum powder and rhodium powder; the organic vehicle includes: 80-96 wt% of terpineol, 3-17 wt% of ethyl cellulose and 0.5-3 wt% of absolute ethyl alcohol.

in the present embodiment, "wt%" means mass percentage.

based on the above fig. 1 and the raw materials of the components of the porous ceramic heating element 100, the embodiments of the method for preparing a porous ceramic heating element 100 according to the present invention are presented:

the first embodiment:

referring to fig. 2, a method for preparing a porous ceramic heating element 100 includes the following steps:

Step S10, extracting a first raw material, the first raw material comprising: 40-80 wt% of aggregate, 8-20 wt% of binder and 12-50 wt% of pore-forming agent. Specifically, the first raw material is extracted according to the following mass fractions: 40-80 wt% of aggregate, 8-20 wt% of binder and 12-50 wt% of pore-forming agent, wherein the aggregate is one or more of silicon carbide, silicon nitride, alumina and quartz; the binder is one or more of alumina, kaolin, feldspar and quartz; the pore-forming agent is one or more of graphite, starch, carbon black and paraffin.

and step S20, grinding and uniformly mixing the first raw material to obtain a mixture. For example, the aggregate, the binder and the pore-forming agent are put into a ball mill for grinding and mixing, and the ball-to-material ratio is 1: 2.

And step S30, granulating the mixture, and placing the mixture in a closed environment for a first preset time to obtain a first material. For example, the first preset time is 24 h. Optionally, pouring the mixture into a mortar, adding 2-7% wt of polyvinyl alcohol into the mixture, uniformly mixing, and granulating. And placing the uniformly mixed and granulated mixed material in a closed environment for ageing for 24 hours to uniformly distribute the polyvinyl alcohol so as to prepare for pressing blanks.

and step S40, pressing the first material into a target blank body. Optionally, the first material is pressed and formed into a preset model, wherein the forming pressure is changed from small to large until reaching a limit pressure value of 3-5.5KN, and then the second preset time is kept; and placing the formed preset model in an oven at the temperature of 90-110 ℃ for drying treatment to obtain the target blank. And in the process of pressing the first material into the target blank, slowly pressurizing to exhaust air in the material, and keeping the pressure for the second preset time after the limit pressure value of 3-5.5KN is reached, wherein the second preset time is 45s, so that the delamination caused by the elastic action is prevented. And (4) drying the target blank after the compression molding in an oven for 5-15h, thereby completing the drying treatment.

step S50, extracting a second raw material, the second raw material comprising: 70-95 wt% of metal powder and 5-30 wt% of organic carrier. Specifically, the second raw material is extracted according to the following mass fractions: 70-95 wt% of metal powder and 5-30 wt% of organic carrier, wherein the metal powder is one or more of a mixture of tungsten powder and molybdenum powder, a mixture of silver powder and palladium powder, and a mixture of platinum powder and rhodium powder; the organic carrier comprises the following raw materials in percentage by mass: 80-96 wt% of terpineol, 3-17 wt% of ethyl cellulose and 0.5-3 wt% of absolute ethyl alcohol.

step S60, the second raw material is uniformly mixed to prepare a metal slurry. Alternatively, the process of preparing the metal powder: placing the metal powder raw materials in a nylon tank, and grinding for 2-5h by using a planetary ball mill, wherein a ball-milling medium is absolute ethyl alcohol: ball: anhydrous ethanol ═ 1: 1.5: 1, ball milling at a rotating speed of 500r/min, and drying the ball-milled metal powder for later use. The process for preparing the organic carrier comprises the following steps: extracting the raw materials according to the mass percent, stirring the ethyl cellulose by using a magnetic stirrer until the ethyl cellulose is completely dissolved, and heating the ethyl cellulose by adopting a water bath in the stirring process, wherein the temperature of the water bath is 80 ℃, and the stirring speed is 300 r/min. And uniformly mixing the prepared metal powder and the organic carrier according to a proportion to prepare the metal slurry.

And step S70, printing the metal slurry on the target blank to obtain a blank to be sintered. Optionally, printing the metal slurry with the viscosity of 15-30 Pa-s on the surface of the target blank; partially covering a pre-cast green body with the metal slurry; and carrying out hot-pressing treatment on the preset casting green body so as to fixedly arrange the preset casting green body on the target green body, thereby obtaining the target green body. The hot-pressing working temperature of the hot-pressing treatment is 40-60 ℃, and the hot-pressing pressure is 9-12 MPa. For example, the metal paste is screen-printed on the surface of the target blank using a semi-automatic screen printer.

And step S80, sintering the green body to be sintered according to the preset heating step. Optionally, placing the green body to be sintered in a glue discharging area for glue discharging treatment for 2-7 h; placing the green body to be sintered after the binder removal treatment in a heating zone for heating treatment, wherein the green body to be sintered is respectively subjected to heat preservation for 60min at the temperature of 280 ℃, 300 ℃, 330 ℃, 500 ℃, 600 ℃, 700 ℃, 800 ℃, 900 ℃, 1000 ℃ and 1100 ℃, and is subjected to heat preservation for 1-3h at the temperature of 1200-1600 ℃; and placing the blank to be sintered after temperature rise treatment in a cooling zone for temperature reduction treatment for 2-7 h. And the green body to be sintered is subjected to a gel removal treatment process, a heating treatment process and a cooling treatment process under a wet hydrogen atmosphere. For example, the green body to be sintered after the hot pressing treatment is placed in a high-temperature sealed tunnel kiln for sintering, wherein the sintering atmosphere is wet hydrogen. The wet hydrogen is mixed gas of nitrogen and hydrogen prepared by an ammonia decomposition generator, and the mixed gas is introduced into a sealed tunnel kiln after passing through water with the temperature of 30-50 ℃. The tunnel kiln comprises the glue discharging area, the heating area and the cooling area. The green body to be sintered sequentially passes through the glue discharging area, the heating area and the cooling area in the kiln, wherein the glue discharging time in the glue discharging area is 3-6 hours, the green body to be sintered after glue discharging enters the heating area, the temperature is raised to 1200-1600 ℃ after 6-10 hours, the temperature is kept for 2 hours, and then the green body to be sintered enters the cooling area, and the cooling time is 3-6 hours. Optionally, in the heating zone, the green body to be sintered is insulated at 280 ℃, 300 ℃, 330 ℃, 500 ℃, 600 ℃, 700 ℃, 800 ℃, 900 ℃, 1000 ℃ and 1100 ℃ for 60 min.

In the method for producing the porous ceramic heating element 100 of the present embodiment, the first raw material is extracted in the following mass fractions: 40-80 wt% of aggregate, 8-20 wt% of binder and 12-50 wt% of pore-forming agent; grinding and uniformly mixing the first raw material to obtain a mixture; granulating the mixture, and placing the mixture in a closed environment for a first preset time to obtain a first material; pressing the first material into a target green body; extracting a second raw material according to the following mass fractions: 70-95 wt% of metal powder and 5-30 wt% of organic carrier; uniformly mixing the second raw material to prepare a metal slurry; printing the metal slurry on the target blank to obtain a blank to be sintered; and sintering the green body to be sintered according to a preset heating step. Thus, the metal paste is printed on the target blank, which is sintered to form the porous ceramic base 10, and sintered to form the porous ceramic heating element 100, and the metal paste is the heating element 20. The heating element 20 and the porous ceramic base 10 are formed after sintering and are fixedly arranged into a whole, so that the stability between the heating element 20 and the porous ceramic base 10 is enhanced, the heating element 20 and the porous ceramic base 10 are tightly attached, the heat energy of the heating element 20 can be fully conducted to the porous ceramic base 10, the temperature difference between the heating element 20 and the porous ceramic base 10 is small, the heat energy utilization rate is improved, and the temperature control process is more accurate.

For example, when a current is passed through the heating element 20 printed on the bottom of the porous ceramic substrate 10, the heating element 20 is turned on to heat and raise the temperature, and the temperature of the porous ceramic substrate 10 is also raised, thereby heating or atomizing the electronic cigarette smoke or other liquid adsorbed in the porous ceramic substrate 10. Further, when the temperature of the heating element 20 increases, the resistance value of the heating element 20 also changes, and the current temperature condition of the heating element 20 can be calculated by detecting the resistance value of the heating element 20 in real time, so that when the heating element 20 is closely attached to the porous ceramic substrate 10 by a printing technique, the temperature of the porous ceramic substrate 10 is approximate to or equal to the temperature of the heating element 20, and the temperature distribution of the surface of the porous ceramic substrate 10 is relatively uniform. Therefore, the temperature of the porous ceramic body 10 can be controlled equivalently and accurately by controlling the temperature of the heating element 20, and if the temperature (or resistance value) of the heating element 20 exceeds a first preset value, the power can be reduced or the output power can be stopped, and if the temperature (or resistance value) of the heating element 20 is lower than a second preset value, the output power can be increased so that the temperature of the heating element 20 is kept constant around a target temperature value, thereby accurately controlling the temperature of the porous ceramic body.

Second embodiment:

Extracting a first feedstock, the first feedstock comprising: 70 wt% of aggregate, 15 wt% of binder and 15 wt% of pore-forming agent. Wherein the aggregate is silicon carbide; the binder is alumina; the pore former is graphite.

And grinding and uniformly mixing the first raw material to obtain a mixture. For example, the aggregate, the binder and the pore-forming agent are put into a ball mill for grinding and mixing, and the ball-to-material ratio is 1: 2.

And granulating the mixture, and placing the mixture in a closed environment for a first preset time to obtain a first material. For example, the first preset time is 24 h. Optionally, pouring the mixture into a mortar, adding 5 wt% of polyvinyl alcohol into the mixture, uniformly mixing, and granulating. And placing the uniformly mixed and granulated mixed material in a closed environment for ageing for 24 hours to uniformly distribute the polyvinyl alcohol so as to prepare for pressing blanks.

and pressing the first material into a target blank body. Optionally, the first material is pressed and formed into a preset model, wherein the forming pressure is changed from small to large until reaching a limit pressure value of 5KN, and then the second preset time is kept; and placing the formed preset model in an oven at 100 ℃ for drying treatment to obtain the target blank. And in the process of pressing the first material into the target blank, slowly pressurizing to exhaust air in the material at the beginning, and maintaining the pressure for the second preset time after the limit pressure value of 5KN is reached, wherein the second preset time is 45s, so that the delamination caused by the elastic action is prevented. And (4) drying the target blank after the compression molding in an oven for 10h, thereby completing the drying treatment.

extracting a second feedstock, the second feedstock comprising: 80 wt% of metal powder and 20 wt% of organic carrier. Specifically, the second raw material is extracted according to the following mass fractions: 70-95 wt% of metal powder and 5-30 wt% of organic carrier, wherein the metal powder is one or more of a mixture of tungsten powder and molybdenum powder, a mixture of silver powder and palladium powder, and a mixture of platinum powder and rhodium powder; the organic carrier comprises the following raw materials in percentage by mass: 87 wt% of terpineol, 11 wt% of ethyl cellulose and 2 wt% of absolute ethyl alcohol.

and uniformly mixing the second raw material to prepare the metal slurry. Alternatively, the process of preparing the metal powder: placing the metal powder raw materials in a nylon tank, and grinding for 2-5h by using a planetary ball mill, wherein a ball-milling medium is absolute ethyl alcohol: ball: anhydrous ethanol ═ 1: 1.5: 1, ball milling at a rotating speed of 500r/min, and drying the ball-milled metal powder for later use. The process for preparing the organic carrier comprises the following steps: extracting the raw materials according to the mass percent, stirring the ethyl cellulose by using a magnetic stirrer until the ethyl cellulose is completely dissolved, and heating the ethyl cellulose by adopting a water bath in the stirring process, wherein the temperature of the water bath is 80 ℃, and the stirring speed is 300 r/min. And uniformly mixing the prepared metal powder and the organic carrier according to a proportion to prepare the metal slurry.

and printing the metal slurry on the target blank to obtain a blank to be sintered. Optionally, printing the metal slurry with the viscosity of 25 Pa-s on the surface of the target blank; partially covering a pre-cast green body with the metal slurry; and carrying out hot-pressing treatment on the preset casting green body so as to fixedly arrange the preset casting green body on the target green body, thereby obtaining the target green body. The hot-pressing working temperature of the hot-pressing treatment is 40-60 ℃, and the hot-pressing pressure is 9-12 MPa. For example, the metal paste is screen-printed on the surface of the target blank using a semi-automatic screen printer.

and sintering the green body to be sintered according to a preset heating step. Optionally, placing the green body to be sintered in a glue discharging area for glue discharging treatment for 7 hours; placing the green body to be sintered after the binder removal treatment in a heating zone for heating treatment, wherein the green body to be sintered is respectively subjected to heat preservation for 60min at the temperature of 280 ℃, 300 ℃, 330 ℃, 500 ℃, 600 ℃, 700 ℃, 800 ℃, 900 ℃, 1000 ℃ and 1100 ℃, and is subjected to heat preservation for 1-3h at the temperature of 1200-1600 ℃; and placing the blank to be sintered after temperature rise treatment in a cooling area for cooling treatment for 5 hours. And the green body to be sintered is subjected to a gel removal treatment process, a heating treatment process and a cooling treatment process under a wet hydrogen atmosphere. For example, the green body to be sintered after the hot pressing treatment is placed in a high-temperature sealed tunnel kiln for sintering, wherein the sintering atmosphere is wet hydrogen. The wet hydrogen is mixed gas of nitrogen and hydrogen prepared by an ammonia decomposition generator, and the mixed gas is introduced into a sealed tunnel kiln after passing through water with the temperature of 30-50 ℃. The tunnel kiln comprises the glue discharging area, the heating area and the cooling area. The green body to be sintered sequentially passes through the glue discharging area, the heating area and the cooling area in the kiln, wherein the glue discharging time in the glue discharging area is 3-6 hours, the green body to be sintered after glue discharging enters the heating area, the temperature is raised to 1200-1600 ℃ after 6-10 hours, the temperature is kept for 2 hours, and then the green body to be sintered enters the cooling area, and the cooling time is 3-6 hours. Optionally, in the heating zone, the green body to be sintered is insulated at 280 ℃, 300 ℃, 330 ℃, 500 ℃, 600 ℃, 700 ℃, 800 ℃, 900 ℃, 1000 ℃ and 1100 ℃ for 60 min.

in summary, the technical solution of the present application includes, but is not limited to, the following advantages:

thus, the metal paste is printed on the target blank, which is sintered to form the porous ceramic base 10, and sintered to form the porous ceramic heating element 100, and the metal paste is the heating element 20. The heating element 20 and the porous ceramic base 10 are formed after sintering and are fixedly arranged into a whole, so that the stability between the heating element 20 and the porous ceramic base 10 is enhanced, the heating element 20 and the porous ceramic base 10 are tightly attached, the heat energy of the heating element 20 can be fully conducted to the porous ceramic base 10, the temperature difference between the heating element 20 and the porous ceramic base 10 is small, the heat energy utilization rate is improved, and the temperature control process is more accurate.

finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.