Graphene ceramic electric cooker and preparation method thereof

Abstract

The invention relates to the field of ceramics, in particular to a graphene ceramic electric cooker and a preparation method thereof.The graphene ceramic electric cooker comprises a green body, the green body comprises a green body side wall and a green body bottom, an annular heat conduction clamping piece and an annular heat preservation clamping piece are arranged in the green body side wall, the annular heat conduction clamping piece is located on the inner side of the annular heat preservation clamping piece, and a heat conduction bottom piece is arranged in the green body bottom; a high-efficiency multi-stage heat conduction path formed by the graphene coating, the copper-based annular heat conduction clamping piece and the heat conduction bottom piece is constructed, the heat conduction coefficient is greatly increased, and therefore the heating speed is increased; the annular heat preservation clamping piece made of the porous ceramic material is arranged in the side wall of the green body, heat conduction between the green body and air is reduced, heat loss is reduced, and energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the field of ceramics, and particularly to a graphene ceramic electric cooker and a preparation method thereof. Background Art

[0002] A ceramic electric cooker includes a heating base and a ceramic pot body. The heating base converts electrical energy into heat energy through an electric heating element. The bottom surface of the ceramic pot body is in direct contact with the heating component of the heating base, thereby transferring the heat energy to the ceramic pot body to cook the food in the pot. The existing ceramic pot body has the following problems: the heat conduction efficiency of the ceramic body is low, resulting in a slow heating speed; the heat preservation performance of the ceramic side wall is poor, resulting in heat being transferred from the side wall to the air, serious heat loss, and increased energy consumption; in the existing structure for improving the heat conduction efficiency through a metal oxide coating, the metal coating is prone to oxidation failure during use, affecting the long-term use stability. In view of this, this case arises. Summary of the Invention

[0003] An object of the present invention is to solve at least the above problems through a graphene ceramic electric cooker and a preparation method thereof.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is as follows: The graphene ceramic electric cooker includes a blank body, the blank body includes a blank side wall and a blank bottom, an annular heat conduction clip and an annular heat preservation clip are arranged inside the blank side wall, the annular heat conduction clip is located inside the annular heat preservation clip, a heat conduction bottom sheet is arranged inside the blank bottom, and a graphene coating is arranged on the bottom surface of the blank bottom.

[0005] Preferably, the raw materials of the graphene coating include the following components in parts by weight: 8 - 14 parts of graphene, 15 - 17 parts of a composite binder, 5 - 7 parts of an antioxidant, 50 - 60 parts of a solvent, and 3 - 5 parts of a surfactant. The composite binder is prepared from silica sol and aluminum sol in a weight ratio of 1:1, and the antioxidant is zinc oxide.

[0006] Preferably, the materials of the annular heat conduction clip and the heat conduction bottom sheet are copper.

[0007] Preferably, the material of the annular heat preservation clip is porous ceramic. The raw materials of the porous ceramic include the following components in parts by weight: 50 - 70 parts of diatomite, 30 - 40 parts of kaolin, 10 - 12 parts of glass fiber, 5 - 7 parts of ammonium bicarbonate, 5 - 6 parts of quartz sand, and 2 - 3 parts of borax.

[0008] Preferably, a downwardly protruding foot ring is arranged at the bottom of the blank bottom, and the graphene coating covers the bottom surface of the blank bottom inside the foot ring.

[0009] Preferably, the outer surface of the blank side wall is covered with artistic glaze, and the inner surface of the blank side wall and the top surface of the blank bottom are covered with transparent glaze. The raw materials of the artistic glaze include the following components in parts by weight: 35-45 parts of quartz, 14-18 parts of potassium feldspar, 15-18 parts of kaolin, 8-12 parts of flake graphite, 1-2 parts of sodium humate, 0.5-1 part of titanium dioxide, 20-30 parts of borosilicate glass powder, 3-5 parts of zinc oxide, and 3-5 parts of nano-aluminum oxide. The raw materials of the transparent glaze include the following components in parts by weight: 30-40 parts of quartz, 22-25 parts of potassium feldspar, 20-22 parts of kaolin, 20-30 parts of borosilicate glass powder, 3-5 parts of zinc oxide, and 3-5 parts of nano-aluminum oxide.

[0010] The preparation method of the graphene ceramic electric cooker includes the following steps: Step a, forming the blank bottom and drying it; Step b, preparing an annular heat-conducting clip, a heat-conducting bottom sheet, and an annular heat-insulating clip, and placing the annular heat-conducting clip inside the annular heat-conducting clip; Step c, placing the blank bottom on the bottom mold, placing the heat-conducting bottom sheet in the concave pit reserved on the blank bottom for positioning, and then placing the combination of the annular heat-conducting clip and the annular heat-conducting clip in the concave pit reserved on the blank bottom for positioning. The heat-conducting bottom sheet is located in the middle of the bottom of the annular heat-conducting clip. Apply blank material at the connection and dry to fix the annular heat-conducting clip, the heat-conducting bottom sheet, and the annular heat-insulating clip; Step d, placing the upper mold on the bottom mold, injecting the blank material from the top, and vibrating the mold to remove air bubbles at the same time. The slurry coats the annular heat-conducting clip, the heat-conducting bottom sheet, and the annular heat-insulating clip to form the blank side wall. After the slurry is dried and solidified, demold to form a blank body, and trim and polish the blank body; Step e, putting the blank body into a kiln for biscuit firing; Step f, forming a graphene coating on the inner bottom surface of the foot ring of the biscuit-fired blank body; Step g, applying artistic glaze on the outer surface of the blank side wall and drying it, and applying transparent glaze on the inner surface of the blank side wall and the top surface of the blank bottom and drying it; Step h, putting it into a kiln for glaze firing to obtain the graphene ceramic electric cooker.

[0011] Preferably, in the step b, the preparation method of the annular heat-insulating clip is as follows: after mixing the components of the raw materials, perform dry pressing molding with a pressure of 15 Mpa, and then perform segmented sintering. First, foam at 600 °C, and then keep warm at 1100 °C for 2 hours to form a closed-cell structure.

[0012] Preferably, in step f, the preparation method of the graphene coating is as follows: Prepare a graphene dispersion: Weigh each component raw material in proportion for standby. Mix silica sol and aluminum sol in advance at a ratio of 1:1. Add a surfactant to a solvent and stir at a low speed for 40 - 60 minutes. Add graphene in batches and stir at a low speed for 30 minutes at room temperature to form a preliminary suspension. Then transfer it to an ultrasonic device and ultrasonicate for 60 - 90 minutes. Spray the graphene dispersion onto the blank base with an air pressure of 0.3 - 0.5 MPa and a spraying distance of 20 cm. Use multi-layer spraying and cure at a low temperature of 150 - 200 °C for 1 hour to form a dense coating. Then spray silica sol on the graphene coating and cure at 300 °C for 1 hour to form a protective layer.

[0013] Preferably, in step h, the glaze firing curve is as follows: Rise from room temperature to 300 °C within 1 hour, rise from 300 °C to 600 °C within 1.5 hours, rise from 600 °C to 800 °C within 1.5 hours, rise from 800 °C to 900 °C within 1 hour, hold at 900 °C for 2 hours, and finally cool naturally. Maintain a reducing atmosphere in the temperature range of 800 - 900 °C and before finally cooling to 200 °C.

[0014] As can be seen from the above description, the graphene ceramic electric cooker and its preparation method provided by the present invention have the following beneficial effects: The present invention constructs an efficient multi-stage heat conduction path formed by the graphene coating, the copper-based annular heat conduction clip, and the heat conduction bottom plate, greatly improving the heat conduction coefficient, thereby increasing the heating speed. An annular heat preservation clip made of porous ceramic material is provided inside the side wall of the blank body, reducing the heat conduction between the blank body and the air, reducing heat loss, and reducing energy consumption. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the graphene ceramic electric cooker. Detailed Embodiments

[0016] The following further describes the present invention through specific embodiments.

[0017] To make the technical means, creative features, achieved purposes, and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments.

[0018] Such as Figure 1As shown in the figure, the graphene ceramic electric cooker of the present invention includes a blank body, which includes a blank side wall 1 and a blank bottom 2. An annular heat-conducting clip 3 and an annular heat-insulating clip 4 are arranged inside the blank side wall 1. The annular heat-conducting clip 3 is located inside the annular heat-insulating clip 4. A heat-conducting bottom sheet 5 is arranged inside the blank bottom 2, and a graphene coating 6 is arranged on the bottom surface of the blank bottom 2. The present invention constructs an efficient multi-stage heat-conducting path formed by the graphene coating 6, the copper-based annular heat-conducting clip 3, and the heat-conducting bottom sheet 5, greatly improving the heat-conducting coefficient, thereby increasing the heating speed. Among them, the graphene coating 6, the heat-conducting bottom sheet 5, and the blank bottom 2 together constitute the bottom heat-conducting core, and the annular heat-conducting clip 3 helps the heat to be quickly conducted to each part; an annular heat-insulating clip 4 made of porous ceramic material is arranged outside the annular heat-conducting clip 3, reducing the heat conduction between the blank body and the air, reducing heat loss, and reducing energy consumption. A control group was set up for the heating speed test. The control group was fired with the blank body raw materials and glazes with the same formula components as the present invention, but without the annular heat-conducting clip 3, the annular heat-insulating clip 4, the heat-conducting bottom sheet 5, and the graphene coating 6. After testing, the heating speed of the graphene ceramic electric cooker of the present invention is increased by 30%-35% compared with the control group.

[0019] The raw materials of the graphene coating 6 are in parts by weight and include the following components: 8-14 parts of graphene, 15-17 parts of composite binder, 5-7 parts of antioxidant, 50-60 parts of solvent, and 3-5 parts of surfactant. The composite binder is prepared from silica sol and aluminum sol according to a weight ratio of 1:1, and the antioxidant is zinc oxide. Graphene has an extremely high heat-conducting coefficient and can quickly conduct heat. The graphene used is few-layer graphene with the best heat conductivity, and the purity is ≥98%; in the composite binder, the particle size of silica sol is 10-20 nm, and the solid content is 30%. The particle size of aluminum sol is 5-10 nm, and the solid content is 25%. The composite binder bonds graphene and ceramics at high temperatures. After sintering, the density of the silicon-aluminum composite binder is >95%, and the porosity is <3%, forming a dense layer, increasing the oxygen diffusion path length by more than 5 times, and inhibiting the oxidation of copper; ZnO reacts with O at temperatures above 600 °C to form a dense ZnO film. Therefore, the antioxidant forms a protective barrier at high temperatures and can also protect copper; the solvent uses deionized water to disperse each component and adjust the fluidity of the slurry; the surfactant uses sodium dodecylbenzenesulfonate to improve the dispersion of graphene and reduce agglomeration. 2 The particle size is 10-20 nm, and the solid content is 30%. The Al of aluminum sol 2 O 3 The particle size is 5-10 nm, and the solid content is 25%. The composite binder bonds graphene and ceramics at high temperatures. After sintering, the density of the silicon-aluminum composite binder is >95%, and the porosity is <3%, forming a dense layer, increasing the oxygen diffusion path length by more than 5 times, and inhibiting the oxidation of copper; ZnO reacts with O at temperatures above 600 °C to form a dense ZnO film. Therefore, the antioxidant forms a protective barrier at high temperatures and can also protect copper; the solvent uses deionized water to disperse each component and adjust the fluidity of the slurry; the surfactant uses sodium dodecylbenzenesulfonate to improve the dispersion of graphene and reduce agglomeration. 2 to form a dense ZnO film. Therefore, the antioxidant forms a protective barrier at high temperatures and can also protect copper; the solvent uses deionized water to disperse each component and adjust the fluidity of the slurry; the surfactant uses sodium dodecylbenzenesulfonate to improve the dispersion of graphene and reduce agglomeration.

[0020] The materials of the annular heat-conducting clip 3 and the heat-conducting bottom sheet 5 are copper. Copper has good heat conductivity. Embedding it inside the blank body can significantly improve the heat-conducting efficiency. The annular heat-conducting clip 3 is woven by thin copper strips, and the heat-conducting bottom sheet 5 can be a whole copper sheet or woven by thin copper strips.

[0021] The material of the annular thermal insulation clip 4 is porous ceramic, and the raw materials of the porous ceramic include the following components by weight: 50-70 parts of diatomaceous earth, 30-40 parts of kaolin, 10-12 parts of glass fiber, 5-7 parts of ammonium bicarbonate, 5-6 parts of quartz sand, and 2-3 parts of borax. Among the components, diatomaceous earth, kaolin, and glass fiber are base materials, ammonium bicarbonate is a foaming agent, and quartz sand and borax are sintering aids. After calcination, a closed-pore porous ceramic is formed, and the pores are filled with air, with a porosity of 60-70%. Because it is divided into discontinuous small units by a large number of pores, heat cannot be quickly transferred through a continuous solid path, so the thermal conductivity is low and the thermal insulation performance is good.

[0022] The bottom of the base 2 is provided with a downwardly protruding ring foot 21, and the graphene coating 6 covers the bottom surface of the base 2 in the ring foot 21. The function of the ring foot 21 is that when the glaze is fired, the ring foot 21 abuts against the shelf, so the bottom surface in the ring foot 21 does not directly contact the shelf, avoiding contact damage to the graphene coating 6. The relatively sealed environment formed between the ring foot 21 and the shelf can also avoid high-temperature decomposition of the graphene coating 6; the heating part of the heating base matched with the graphene ceramic electric cooker protrudes upward, and the diameter of the heating part is slightly smaller than the inner diameter of the ring foot 21. When in use, the heating part is embedded in the ring foot 21 and directly contacts the bottom surface of the ceramic. With the help of the graphene coating 6 and the thermal conductive bottom sheet 5, the heat is directly conducted through the bottom of the ceramic to the inside.

[0023] The outer surface of the blank side wall 1 is covered with an artistic glaze 7, and the inner surface of the blank side wall 1 and the top surface of the blank bottom 2 are covered with a transparent glaze 8. The raw materials of the artistic glaze 7 include the following components in parts by weight: 35-45 parts of quartz, 14-18 parts of potassium feldspar, 15-18 parts of kaolin, 8-12 parts of flake graphite, 1-2 parts of sodium humate, 0.5-1 parts of titanium dioxide, 20-30 parts of borosilicate glass powder, 3-5 parts of zinc oxide, and 3-5 parts of nano alumina. The raw materials of the transparent glaze 8 include the following components in parts by weight: 30-40 parts of quartz, 22-25 parts of potassium feldspar, 20-22 parts of kaolin, 20-30 parts of borosilicate glass powder, 3-5 parts of zinc oxide, and 3-5 parts of nano alumina. Among the glaze components, graphite powder does not melt at high temperatures and retains its flaky structure, providing a silver-grey metallic luster or a directional reflection effect, and ultimately forming metallic patterns on the glaze surface, giving Art Glaze 7 a unique glaze effect; borosilicate glass powder and zinc oxide can significantly reduce the firing temperature, nano-alumina can improve the mechanical strength of the glaze layer, and sodium humate can wrap carbon particles to prevent agglomeration; titanium dioxide can increase the glaze opacity and highlight the graphite luster.

[0024] The preparation method of the graphene ceramic electric cooker comprises the following steps: Step a, forming the base 2 and drying it; Step b: Prepare the annular heat-conducting clip 3, the heat-conducting bottom plate 5 and the annular heat-insulating clip 4, and place the annular heat-conducting clip 3 inside the annular heat-conducting clip 3; Before assembly, first brush a layer of silica sol on the surfaces of the annular heat-conducting clip 3 and the heat-conducting bottom plate 5 and dry it. After assembly, brush another layer of silica sol on the surfaces of the annular heat-conducting clip 3 and the heat-conducting bottom plate 5 to play a role of fixation and protection. The silica sol forms a protective layer on the copper surface during firing, isolating oxygen contact and avoiding oxidation of copper during firing.

[0025] Step c: Place the blank bottom 2 on the bottom mold, place the heat-conducting bottom plate 5 in the concave pit reserved on the blank bottom 2 for positioning, and then place the assembly of the annular heat-conducting clip 3 and the annular heat-conducting clip 3 in the concave pit reserved on the blank bottom 2 for positioning. The heat-conducting bottom plate 5 is located in the middle at the bottom of the annular heat-conducting clip 3. Apply the blank material at the joint and dry it to fix the annular heat-conducting clip 3, the heat-conducting bottom plate 5 and the annular heat-insulating clip 4; Step d: Place the upper mold on the bottom mold, inject the blank material from the top, and vibrate the mold simultaneously to remove air bubbles. The slurry coats the annular heat-conducting clip 3, the heat-conducting bottom plate 5 and the annular heat-insulating clip 4 to form the blank side wall 1. After the slurry is dried and solidified, demold it to form the blank body, and perform trimming and grinding on the blank body; The upper mold has a core that can be embedded in the bottom mold. There is a gap for the slurry to flow between the bottom mold and the annular heat-insulating clip 4, and there is a gap for the slurry to flow between the annular heat-conducting clip 3, the heat-conducting bottom plate 5 and the core. Inject the slurry through the grouting port at the top of the upper mold so that the slurry coats the annular heat-conducting clip 3, the heat-conducting bottom plate 5 and the annular heat-insulating clip 4. After the blank body is dried, demold it, and perform trimming and grinding on the blank body to obtain the blank body embedded with the annular heat-conducting clip 3, the heat-conducting bottom plate 5 and the annular heat-insulating clip 4.

[0026] Step e: Put the blank body into the kiln for biscuit firing; Step f: Form the graphene coating 6 on the inner bottom surface of the foot ring 21 of the biscuit-fired blank body; Step g: Apply the artistic glaze 7 on the outer surface of the blank side wall 1 and dry it, and apply the transparent glaze 8 on the inner surface of the blank side wall 1 and the top surface of the blank bottom 2 and dry it; Step h: Put it into the kiln for glaze firing to obtain the graphene ceramic electric cooker.

[0027] In step b, the preparation method of the annular heat-insulating clip 4 is as follows: After mixing the components of the raw materials, perform dry pressing molding with a pressure of 15 Mpa, and then perform segmented sintering. First, foam at 600 °C, and then keep it at 1100 °C for 2 hours to form a closed-cell structure.

[0028] In step f, the preparation method of the graphene coating 6 is as follows: Prepare a graphene dispersion liquid, spray the graphene dispersion liquid onto the blank base 2 with an air pressure of 0.3 - 0.5 MPa and a spraying distance of 20 cm. Use multi-layer spraying, and cure at a low temperature of 150 - 200 °C for 1 hour to form a dense coating. Then, spray silica sol on the graphene coating 6 and cure at 300 °C for 1 hour to form a protective layer. The silica sol forms a protective film on the surface of the graphene coating 6 to block the penetration of oxygen. Since the art glaze 7 and the sealing glaze use low-temperature glazes with a firing temperature of 900 °C, the low-temperature glaze firing can also effectively prevent the graphene coating 6 from being damaged during glaze firing.

[0029] In step h, the glaze firing curve is as follows: Rise from room temperature to 300 °C within 1 hour, rise from 300 °C to 600 °C within 1.5 hours, rise from 600 °C to 800 °C within 1.5 hours, rise from 800 °C to 900 °C within 1 hour, hold at 900 °C for 2 hours, and finally cool naturally. Maintain a reducing atmosphere in the temperature range of 800 - 900 °C and before finally cooling to 200 °C. Regarding the protection of copper and the graphene coating 6 during glaze firing, since the oxidation rate is the fastest below 600 - 800 °C, rapid heating is required in the low-temperature stage to reduce the residence time of the copper wire in the oxidizing atmosphere and also prevent the decomposition and damage of the graphene coating 6. Ensure the stability of the reducing atmosphere in the high-temperature stage to avoid re-oxidation midway and protect the copper wire and the graphene coating 6. The glaze firing temperature is 900 °C. Maintain the reducing atmosphere until the temperature drops below 200 °C in the cooling stage to prevent the copper from being re-oxidized during cooling. Regarding the glaze firing of the art glaze 7: Since the flake graphite does not melt at high temperatures and is protected by a reducing atmosphere, it can retain its flaky structure, providing a silver-gray metallic luster or a directional reflection effect, with a unique artistic effect.

[0030] The above are only several specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantive modification made to the present invention using this concept shall fall within the scope of infringement of the protection scope of the present invention.

Claims

1. Graphene ceramic electric cooker, characterized by: The invention comprises a blank body, wherein the blank body comprises a blank side wall and a blank bottom, wherein an annular heat-conducting clip and an annular heat-insulating clip are arranged inside the blank side wall, wherein the annular heat-conducting clip is located inside the annular heat-insulating clip, wherein a heat-conducting bottom plate is arranged inside the blank bottom, wherein a graphene coating is arranged on the bottom surface of the blank bottom, wherein the raw materials of the graphene coating comprise the following components in parts by weight: 8-14 parts of graphene, 15-17 parts of a composite binder, 5-7 parts of an antioxidant, 50-60 parts of a solvent, and 3-5 parts of a surfactant, wherein the composite binder is prepared by silica sol and aluminum sol in a weight ratio of 1:1, wherein the antioxidant is zinc oxide, wherein the material of the annular heat-insulating clip is porous ceramic, wherein the raw materials of the porous ceramic comprise the following components in parts by weight: 50-70 parts of diatomaceous earth, 30-40 parts of kaolin, 10-12 parts of glass fiber, 5-7 parts of ammonium bicarbonate, 5-6 parts of quartz sand, and 2-3 parts of borax.

2. The graphene ceramic electric cooker according to claim 1, characterized in that: The annular heat-conducting clip and the heat-conducting bottom plate are made of copper.

3. The graphene ceramic electric cooker according to claim 1, characterized in that: The bottom of the blank bottom is provided with a ring foot protruding downward, and the graphene coating covers the bottom surface of the blank bottom within the ring foot.

4. The graphene ceramic electric cooker according to claim 1, characterized in that: The outer surface of the side wall of the blank is covered with artistic glaze, and the inner surface of the side wall and the top surface of the bottom of the blank are covered with transparent glaze. The raw materials of the artistic glaze include the following components in parts by weight: 35-45 parts of quartz, 14-18 parts of potassium feldspar, 15-18 parts of kaolin, 8-12 parts of flake graphite, 1-2 parts of sodium humate, 0.5-1 parts of titanium dioxide, 20-30 parts of borosilicate glass powder, 3-5 parts of zinc oxide, and 3-5 parts of nano alumina. The raw materials of the transparent glaze include the following components in parts by weight: 30-40 parts of quartz, 22-25 parts of potassium feldspar, 20-22 parts of kaolin, 20-30 parts of borosilicate glass powder, 3-5 parts of zinc oxide, and 3-5 parts of nano alumina.

5. The method for preparing a graphene ceramic electric cooker according to any one of claims 1 to 4, characterized in that: The steps include: Step a, forming and drying the base; Step b, preparing an annular heat-conducting clip, a heat-conducting bottom sheet and an annular heat-insulating clip, and placing the annular heat-conducting clip inside the annular heat-conducting clip; Step c, placing the bottom of the blank on the bottom mold, placing the heat-conducting bottom sheet in the pit reserved on the bottom of the blank for positioning, and then placing the annular heat-conducting clip and the assembly of the annular heat-conducting clip in the pit reserved on the bottom of the blank for positioning, the heat-conducting bottom sheet is located in the middle of the bottom of the annular heat-conducting clip, applying the blank at the connection and drying and fixing the annular heat-conducting clip, the heat-conducting bottom sheet and the annular heat-insulating clip; Step d, placing an upper mold on the bottom mold, injecting the blank from the top, and vibrating the mold to remove bubbles, the slurry covers the annular heat-conducting clip, the heat-conducting bottom sheet and the annular heat-insulating clip to form the side wall of the blank, and the slurry is dried and solidified and then demolded to form a blank, and the blank is repaired and polished; Step e, placing the green body into a kiln for biscuit firing; Step f, forming a graphene coating on the inner bottom surface of the ring foot of the bisque-fired green body; Step g, applying artistic glaze on the outer surface of the side wall of the blank and drying it, and applying transparent glaze on the inner surface of the side wall of the blank and the top surface of the bottom of the blank and drying it; Step h, putting the graphene ceramic rice cooker into a kiln for glaze firing to obtain a graphene ceramic rice cooker.

6. The method for preparing a graphene ceramic electric cooker according to claim 5, characterized in that: In step b, the preparation method of the annular thermal insulation clip is as follows: after mixing the various components of the raw materials, dry pressing is performed at a pressure of 15Mpa, and then segmented sintering is performed, first foaming at 600°C, and then keeping warm at 1100°C for 2 hours to form a closed-cell structure.

7. The method for preparing a graphene ceramic electric cooker according to claim 5, characterized in that: In the step f, the preparation method of the graphene coating is as follows: prepare a graphene dispersion, spray the graphene dispersion onto the bottom of the blank, the air pressure is 0.3-0.5MPa, the spraying distance is 20cm, multi-layer spraying is adopted, and a dense coating is formed by low temperature curing at 150-200°C for 1 hour, and then silica sol is sprayed on the graphene coating, and cured at 300°C for 1 hour to form a protective layer.

8. The method for preparing a graphene ceramic electric cooker according to claim 5, characterized in that: In the step h, the glaze firing curve is as follows: from room temperature to 300°C within 1 hour, from 300°C to 600°C within 1.5 hours, from 600°C to 800°C within 1.5 hours, from 800°C to 900°C within 1 hour, keeping at 900°C for 2 hours, and finally cooling naturally, maintaining a reducing atmosphere in the temperature range of 800-900°C and before finally cooling to 200°C.

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