A kind of household enamel heating plate

Abstract

The present invention discloses a household enameled heating plate, specifically relating to the technical field of enameled heating plates. The plate comprises a metal layer, an enamel layer, and a graphene coating. The method for preparing the heating plate comprises the following steps: obtaining a metal plate of a specified size and shape, pre-treating the metal plate to obtain the pre-treated metal plate; and preparing conductive fibers by reacting cellulose pulp with graphene to prepare the conductive fibers. The present invention utilizes an enamelling process, which allows for relatively uniform adhesion to a given particle surface, enhancing bonding. Anhydrous ethanol acts as a grinding aid, enhancing the ball milling effect during the enamel material preparation process. The use of nickel, silicon, and boric acid enhances the seismic and heat resistance of the enamel layer. Furthermore, the enamel layer in this embodiment exhibits ideal impact resistance, making it less susceptible to edge collapse due to minor impacts or continuous performance degradation during heating, thereby ensuring a normal service life and making the plate suitable for widespread use.

Description

Technical Field

[0001] The present invention relates to the technical field of enamel heating plates, and more particularly to a household enamel heating plate. Background Art

[0002] Enamel coatings primarily refer to single or multiple layers of enamel applied to metal surfaces. During high-temperature enamel firing, physical and chemical reactions occur between the metal substrate and the inorganic glass frit. This reaction precipitates a large number of crystals at the interface, ultimately forming chemical bonds and creating a dense coating. Generally, this process involves mixing silicate and oxide powders, then calcining them at high temperatures before coating the surface, providing high-temperature protection for the substrate.

[0003] Enamel coatings offer advantages such as high-temperature oxidation resistance, low cost, and heat-corrosion resistance, making them ideal for metal protection. This is because during high-temperature enameling, the metal substrate reacts with the enamel glaze. This physical and chemical reaction causes crystals to precipitate at the interface, ultimately forming chemical bonds that securely bond the coating to the substrate.

[0004] In daily life, enamel panels are needed for decoration of some parts of the home or special locations to ensure usage requirements. Enamel panels have good corrosion resistance, are easy to clean, and are scratch-resistant. However, existing enamel panels do not have a heating function. Some parts will come into contact with the human body and need to be heated at low temperatures to increase usage comfort. The impact resistance of the surface of existing enamel panels is not ideal, and they are prone to breakage when encountering collisions. At the same time, when the enamel panels are heated, the surface of the enamel panels may be unevenly heated, resulting in large temperature differences and cracks. Therefore, a home enamel heating panel is needed to solve the above problems. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides an enamel heating plate for household use. The technical problem to be solved by the present invention is: the existing enamel plate does not have a heating function, and some positions will come into contact with the human body. It needs to be heated at low temperatures to increase the comfort of use. The impact resistance of the surface of the existing enamel plate is not ideal, and it is easy to break when encountering a collision. At the same time, when the enamel plate is heated, the surface of the enamel plate may be unevenly heated, resulting in a large temperature difference and cracks.

[0006] To achieve the above object, the present invention provides the following technical solution: a household enamel heating plate, comprising a metal layer, an enamel layer and a graphene coating, wherein the preparation method of the heating plate comprises the following steps:

[0007] S1. Obtain a metal plate of a specified size and shape, and pre-treat the metal plate to obtain a pre-treated metal plate;

[0008] S2, preparation of conductive fibers, using cellulose pulp and graphene to react to prepare conductive fibers;

[0009] S3, the conductive fibers are placed at a preset position on the surface of the metal plate to form a coplanar, semi-finished metal plate;

[0010] S4, preparing enamel material, mixing enamel raw materials to obtain enamel material;

[0011] S5, enamel coating, coating the obtained enamel material on the surface of the pretreated metal plate;

[0012] S6, sintering, sintering the metal plate coated with the enamel material to obtain an enameled heating plate;

[0013] S7, graphene coating, coating the graphene coating on the sintered enamel surface to obtain the final product.

[0014] The metal plate pretreatment process in S1 is as follows:

[0015] First, use 100# sandpaper to polish for 10 minutes, then use 200# sandpaper to polish until there are no obvious scratches on the surface;

[0016] Use acetone solution for cleaning, the cleaning time is 20 minutes, and after cleaning, put it into the drying box for drying, and the drying temperature is controlled at 85-95℃.

[0017] The S4 enamel material preparation process comprises the following steps:

[0018] Preparation of enamel glaze: weighing powder for enamel glaze, comprising the following components by mass: 32% silicon oxide, 50% boric acid, 5% aluminum oxide, 11% sodium carbonate, and 2% zirconium oxide, and filtering the powder. The raw materials were placed in a ball mill and uniformly mixed for 35 minutes. The mixed raw materials were placed in a corundum crucible, and the temperature of a box-type high-temperature furnace was controlled to be raised to 1460° C. and smelted for 1.5 hours to obtain a uniform melt. The enamel glaze was then quenched in water to obtain a block-shaped enamel glaze.

[0019] Preparation of enamel material: The obtained block enamel glaze is placed in a drying oven at 210°C for drying, and then placed in a ball mill for crushing. The ball milling process lasts for 68 hours to obtain fine enamel powder. The enamel powder is passed through a 200-mesh sieve to obtain sieved enamel powder. Anhydrous ethanol is added to the enamel powder, and after sufficient stirring for 2 hours, cobalt oxide, nickel oxide and clay are added to the solution. The ball milling is continued for 100 hours to obtain the enamel material.

[0020] The enamel coating process in S5 comprises the following steps:

[0021] Heat the semi-finished metal plate to 75-82℃, clamp the semi-finished metal plate and place it into the enamel material, so that the semi-finished metal plate is completely immersed in the enamel material;

[0022] The semi-finished metal plate is taken out from the enamel material, and the residual heat of the semi-finished metal plate dries the enamel material, and finally a powdery covering layer is formed on the surface of the semi-finished metal plate.

[0023] The S6 sintering process includes the following steps:

[0024] Place the semi-finished metal plate covered with powdery coating on the surface of refractory bricks and sinter it in a box furnace at a temperature of 850-950℃ for 15-20 minutes.

[0025] After sintering, the sample was cooled naturally to room temperature to obtain a dark green enamel heating plate.

[0026] The beneficial effects of the present invention are:

[0027] 1. The present invention adopts an enamelling process, and cobalt oxide and nickel oxide are used as adhesives to increase the adhesion between the glaze and the substrate during the preparation of the enamel material. The clay used makes the enamel material present a relatively stable suspension state, which can adhere relatively evenly to a certain particle surface, thereby increasing the cementing effect. Anhydrous ethanol acts as a grinding aid, increasing the ball milling effect during the preparation of the enamel material. The use of nickel, silicon, and boric acid increases the seismic resistance and heat resistance of the enamel layer. At the same time, the impact resistance of the enamel layer in this solution is relatively ideal, so that the whole is not prone to edge collapse due to slight impact or continuous performance degradation during heating during use, ensuring a normal service life and being suitable for large-scale promotion and use.

[0028] 2. The present invention places conductive fibers on the same plane as the surface of the metal plate and adopts a graphene coating. The graphene coating has a high thermal conductivity coefficient. When the conductive fibers are energized and heated, the heat can be transferred to the graphene coating. The graphene coating evenly disperses the heat to the surface of the heating plate, reducing the probability of large temperature differences at different positions on the surface of the heating plate, making the overall heating more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the internal structure of the present invention;

[0030] Figure 2 Schematic diagram of the three-dimensional structure of the metal layer of the present invention;

[0031] In the figure: 1. Metal layer; 2. Enamel layer; 3. Graphene coating. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Example 1:

[0034] A household enamel heating plate comprises a metal layer, an enamel layer and a graphene coating. The preparation method of the heating plate comprises the following steps:

[0035] S1. Obtain a metal plate of a specified size and shape, and pre-treat the metal plate to obtain a pre-treated metal plate;

[0036] S2, preparation of conductive fibers, using cellulose pulp and graphene to react to prepare conductive fibers;

[0037] S3, the conductive fibers are placed at a preset position on the surface of the metal plate to form a coplanar, semi-finished metal plate;

[0038] S4, preparing enamel material, mixing enamel raw materials to obtain enamel material;

[0039] S5, enamel coating, coating the obtained enamel material on the surface of the pretreated metal plate;

[0040] S6, sintering, sintering the metal plate coated with the enamel material to obtain an enameled heating plate;

[0041] S7, graphene coating, coating the graphene coating on the sintered enamel surface to obtain the final product.

[0042] The metal plate pretreatment process in S1 is:

[0043] First, use 100# sandpaper to polish for 10 minutes, then use 200# sandpaper to polish until there are no obvious scratches on the surface;

[0044] Use acetone solution for cleaning, the cleaning time is 20 minutes, and after cleaning, put it into the drying box for drying, and the drying temperature is controlled at 85-95℃.

[0045] The S4 enamel material preparation process includes the following steps:

[0046] Preparation of enamel glaze: weighing powder for enamel glaze, comprising the following components by mass: 32% silicon oxide, 50% boric acid, 5% aluminum oxide, 11% sodium carbonate, and 2% zirconium oxide, and filtering the powder. The raw materials were placed in a ball mill and uniformly mixed for 35 minutes. The mixed raw materials were placed in a corundum crucible, and the temperature of a box-type high-temperature furnace was controlled to be raised to 1460° C. and smelted for 1.5 hours to obtain a uniform melt. The enamel glaze was then quenched in water to obtain a block-shaped enamel glaze.

[0047] Preparation of enamel material: The obtained block enamel glaze is placed in a drying oven at 210°C for drying, and then placed in a ball mill for crushing. The ball milling process lasts for 68 hours to obtain fine enamel powder. The enamel powder is passed through a 200-mesh sieve to obtain sieved enamel powder. Anhydrous ethanol is added to the enamel powder, and after sufficient stirring for 2 hours, cobalt oxide, nickel oxide and clay are added to the solution. The ball milling is continued for 100 hours to obtain the enamel material.

[0048] The enamel coating process in S5 includes the following steps:

[0049] Heat the semi-finished metal plate to 75-82℃, clamp the semi-finished metal plate and place it into the enamel material, so that the semi-finished metal plate is completely immersed in the enamel material;

[0050] The semi-finished metal plate is taken out from the enamel material, and the residual heat of the semi-finished metal plate dries the enamel material, and finally a powdery covering layer is formed on the surface of the semi-finished metal plate.

[0051] The S6 sintering process includes the following steps:

[0052] The semi-finished metal plate covered with the powdered covering is placed on the surface of the refractory bricks and sintered in a box furnace at a temperature of 850°C for 18 minutes.

[0053] After sintering, the sample was cooled naturally to room temperature to obtain a dark green enamel heating plate.

[0054] Example 2:

[0055] A household enamel heating plate comprises a metal layer, an enamel layer and a graphene coating. The preparation method of the heating plate comprises the following steps:

[0056] S1. Obtain a metal plate of a specified size and shape, and pre-treat the metal plate to obtain a pre-treated metal plate;

[0057] S2, preparation of conductive fibers, using cellulose pulp and graphene to react to prepare conductive fibers;

[0058] S3, the conductive fibers are placed at a preset position on the surface of the metal plate to form a coplanar, semi-finished metal plate;

[0059] S4, preparing enamel material, mixing enamel raw materials to obtain enamel material;

[0060] S5, enamel coating, coating the obtained enamel material on the surface of the pretreated metal plate;

[0061] S6, sintering, sintering the metal plate coated with the enamel material to obtain an enameled heating plate;

[0062] S7, graphene coating, coating the graphene coating on the sintered enamel surface to obtain the final product.

[0063] The metal plate pretreatment process in S1 is:

[0064] First, use 100# sandpaper to polish for 10 minutes, then use 200# sandpaper to polish until there are no obvious scratches on the surface;

[0065] Use acetone solution for cleaning, the cleaning time is 20 minutes, and after cleaning, put it into the drying box for drying, and the drying temperature is controlled at 85-95℃.

[0066] The S4 enamel material preparation process includes the following steps:

[0067] Preparation of enamel glaze: weighing powder for enamel glaze, comprising the following components by mass: 32% silicon oxide, 50% boric acid, 5% aluminum oxide, 11% sodium carbonate, and 2% zirconium oxide, and filtering the powder. The raw materials were placed in a ball mill and uniformly mixed for 35 minutes. The mixed raw materials were placed in a corundum crucible, and the temperature of a box-type high-temperature furnace was controlled to be raised to 1460° C. and smelted for 1.5 hours to obtain a uniform melt. The enamel glaze was then quenched in water to obtain a block-shaped enamel glaze.

[0068] Preparation of enamel material: The obtained block enamel glaze is placed in a drying oven at 210°C for drying, and then placed in a ball mill for crushing. The ball milling process lasts for 68 hours to obtain fine enamel powder. The enamel powder is passed through a 200-mesh sieve to obtain sieved enamel powder. Anhydrous ethanol is added to the enamel powder, and after sufficient stirring for 2 hours, cobalt oxide, nickel oxide and clay are added to the solution. The ball milling is continued for 100 hours to obtain the enamel material.

[0069] The enamel coating process in S5 includes the following steps:

[0070] Heat the semi-finished metal plate to 75-82℃, clamp the semi-finished metal plate and place it into the enamel material, so that the semi-finished metal plate is completely immersed in the enamel material;

[0071] The semi-finished metal plate is taken out from the enamel material, and the residual heat of the semi-finished metal plate dries the enamel material, and finally a powdery covering layer is formed on the surface of the semi-finished metal plate.

[0072] The S6 sintering process includes the following steps:

[0073] The semi-finished metal plate covered with the powdered covering is placed on the surface of the refractory bricks and sintered in a box furnace at a temperature of 880°C for 18 minutes.

[0074] After sintering, the sample was cooled naturally to room temperature to obtain a dark green enamel heating plate.

[0075] Example 3:

[0076] A household enamel heating plate comprises a metal layer, an enamel layer and a graphene coating. The preparation method of the heating plate comprises the following steps:

[0077] S1. Obtain a metal plate of a specified size and shape, and pre-treat the metal plate to obtain a pre-treated metal plate;

[0078] S2, preparation of conductive fibers, using cellulose pulp and graphene to react to prepare conductive fibers;

[0079] S3, the conductive fibers are placed at a preset position on the surface of the metal plate to form a coplanar, semi-finished metal plate;

[0080] S4, preparing enamel material, mixing enamel raw materials to obtain enamel material;

[0081] S5, enamel coating, coating the obtained enamel material on the surface of the pretreated metal plate;

[0082] S6, sintering, sintering the metal plate coated with the enamel material to obtain an enameled heating plate;

[0083] S7, graphene coating, coating the graphene coating on the sintered enamel surface to obtain the final product.

[0084] The metal plate pretreatment process in S1 is:

[0085] First, use 100# sandpaper to polish for 10 minutes, then use 200# sandpaper to polish until there are no obvious scratches on the surface;

[0086] Use acetone solution for cleaning, the cleaning time is 20 minutes, and after cleaning, put it into the drying box for drying, and the drying temperature is controlled at 85-95℃.

[0087] The S4 enamel material preparation process includes the following steps:

[0088] Preparation of enamel glaze: weighing powder for enamel glaze, comprising the following components by mass: 32% silicon oxide, 50% boric acid, 5% aluminum oxide, 11% sodium carbonate, and 2% zirconium oxide, and filtering the powder. The raw materials were placed in a ball mill and uniformly mixed for 35 minutes. The mixed raw materials were placed in a corundum crucible, and the temperature of a box-type high-temperature furnace was controlled to be raised to 1460° C. and smelted for 1.5 hours to obtain a uniform melt. The enamel glaze was then quenched in water to obtain a block-shaped enamel glaze.

[0089] Preparation of enamel material: The obtained block enamel glaze is placed in a drying oven at 210°C for drying, and then placed in a ball mill for crushing. The ball milling process lasts for 68 hours to obtain fine enamel powder. The enamel powder is passed through a 200-mesh sieve to obtain sieved enamel powder. Anhydrous ethanol is added to the enamel powder, and after sufficient stirring for 2 hours, cobalt oxide, nickel oxide and clay are added to the solution. The ball milling is continued for 100 hours to obtain the enamel material.

[0090] The enamel coating process in S5 includes the following steps:

[0091] Heat the semi-finished metal plate to 75-82℃, clamp the semi-finished metal plate and place it into the enamel material, so that the semi-finished metal plate is completely immersed in the enamel material;

[0092] The semi-finished metal plate is taken out from the enamel material, and the residual heat of the semi-finished metal plate dries the enamel material, and finally a powdery covering layer is formed on the surface of the semi-finished metal plate.

[0093] The S6 sintering process includes the following steps:

[0094] The semi-finished metal plate covered with the powdered covering layer was placed on the surface of the refractory bricks and sintered in a box furnace at a temperature of 910°C for 18 minutes.

[0095] After sintering, the sample was cooled naturally to room temperature to obtain a dark green enamel heating plate.

[0096] Example 4:

[0097] A household enamel heating plate comprises a metal layer, an enamel layer and a graphene coating. The preparation method of the heating plate comprises the following steps:

[0098] S1. Obtain a metal plate of a specified size and shape, and pre-treat the metal plate to obtain a pre-treated metal plate;

[0099] S2, preparation of conductive fibers, using cellulose pulp and graphene to react to prepare conductive fibers;

[0100] S3, the conductive fibers are placed at a preset position on the surface of the metal plate to form a coplanar, semi-finished metal plate;

[0101] S4, preparing enamel material, mixing enamel raw materials to obtain enamel material;

[0102] S5, enamel coating, coating the obtained enamel material on the surface of the pretreated metal plate;

[0103] S6, sintering, sintering the metal plate coated with the enamel material to obtain an enameled heating plate;

[0104] S7, graphene coating, coating the graphene coating on the sintered enamel surface to obtain the final product.

[0105] The metal plate pretreatment process in S1 is:

[0106] First, use 100# sandpaper to polish for 10 minutes, then use 200# sandpaper to polish until there are no obvious scratches on the surface;

[0107] Use acetone solution for cleaning, the cleaning time is 20 minutes, and after cleaning, put it into the drying box for drying, and the drying temperature is controlled at 85-95℃.

[0108] The S4 enamel material preparation process includes the following steps:

[0109] Preparation of enamel glaze: weighing powder for enamel glaze, comprising the following components by mass: 32% silicon oxide, 50% boric acid, 5% aluminum oxide, 11% sodium carbonate, and 2% zirconium oxide, and filtering the powder. The raw materials were placed in a ball mill and uniformly mixed for 35 minutes. The mixed raw materials were placed in a corundum crucible, and the temperature of a box-type high-temperature furnace was controlled to be raised to 1460° C. and smelted for 1.5 hours to obtain a uniform melt. The enamel glaze was then quenched in water to obtain a block-shaped enamel glaze.

[0110] Preparation of enamel material: The obtained block enamel glaze is placed in a drying oven at 210°C for drying, and then placed in a ball mill for crushing. The ball milling process lasts for 68 hours to obtain fine enamel powder. The enamel powder is passed through a 200-mesh sieve to obtain sieved enamel powder. Anhydrous ethanol is added to the enamel powder, and after sufficient stirring for 2 hours, cobalt oxide, nickel oxide and clay are added to the solution. The ball milling is continued for 100 hours to obtain the enamel material.

[0111] The enamel coating process in S5 includes the following steps:

[0112] Heat the semi-finished metal plate to 75-82℃, clamp the semi-finished metal plate and place it into the enamel material, so that the semi-finished metal plate is completely immersed in the enamel material;

[0113] The semi-finished metal plate is taken out from the enamel material, and the residual heat of the semi-finished metal plate dries the enamel material, and finally a powdery covering layer is formed on the surface of the semi-finished metal plate.

[0114] The S6 sintering process includes the following steps:

[0115] The semi-finished metal plate covered with the powdered covering is placed on the surface of the refractory bricks and sintered in a box furnace at a temperature of 950°C for 18 minutes.

[0116] After sintering, the sample was cooled naturally to room temperature to obtain a dark green enamel heating plate.

[0117] From Examples 1-4, the following table is obtained:

[0118] Sintering temperature (℃) Impact resistance Example 1 850 4.2 Example 2 880 3.1 Example 3 910 2.0 Example 4 950 2.1

[0119] Example 5:

[0120] A household enamel heating plate comprises a metal layer, an enamel layer and a graphene coating. The preparation method of the heating plate comprises the following steps:

[0121] S1. Obtain a metal plate of a specified size and shape, and pre-treat the metal plate to obtain a pre-treated metal plate;

[0122] S2, preparation of conductive fibers, using cellulose pulp and graphene to react to prepare conductive fibers;

[0123] S3, the conductive fibers are placed at a preset position on the surface of the metal plate to form a coplanar, semi-finished metal plate;

[0124] S4, preparing enamel material, mixing enamel raw materials to obtain enamel material;

[0125] S5, enamel coating, coating the obtained enamel material on the surface of the pretreated metal plate;

[0126] S6, sintering, sintering the metal plate coated with the enamel material to obtain an enameled heating plate;

[0127] S7, graphene coating, coating the graphene coating on the sintered enamel surface to obtain the final product.

[0128] The metal plate pretreatment process in S1 is:

[0129] First, use 100# sandpaper to polish for 10 minutes, then use 200# sandpaper to polish until there are no obvious scratches on the surface;

[0130] Use acetone solution for cleaning, the cleaning time is 20 minutes, and after cleaning, put it into the drying box for drying, and the drying temperature is controlled at 85-95℃.

[0131] The S4 enamel material preparation process includes the following steps:

[0132] Preparation of enamel glaze: weighing powder for enamel glaze, comprising the following components by mass: 32% silicon oxide, 50% boric acid, 5% aluminum oxide, 11% sodium carbonate, and 2% zirconium oxide, and filtering the powder. The raw materials were placed in a ball mill and uniformly mixed for 35 minutes. The mixed raw materials were placed in a corundum crucible, and the temperature of a box-type high-temperature furnace was controlled to be raised to 1460° C. and smelted for 1.5 hours to obtain a uniform melt. The enamel glaze was then quenched in water to obtain a block-shaped enamel glaze.

[0133] Preparation of enamel material: The obtained block enamel glaze is placed in a drying oven at 210°C for drying, and then placed in a ball mill for crushing. The ball milling process lasts for 68 hours to obtain fine enamel powder. The enamel powder is passed through a 200-mesh sieve to obtain sieved enamel powder. Anhydrous ethanol is added to the enamel powder, and after sufficient stirring for 2 hours, cobalt oxide, nickel oxide and clay are added to the solution. The ball milling is continued for 100 hours to obtain the enamel material.

[0134] The enamel coating process in S5 includes the following steps:

[0135] Heat the semi-finished metal plate to 75-82℃, clamp the semi-finished metal plate and place it into the enamel material, so that the semi-finished metal plate is completely immersed in the enamel material;

[0136] The semi-finished metal plate is taken out from the enamel material, and the residual heat of the semi-finished metal plate dries the enamel material, and finally a powdery covering layer is formed on the surface of the semi-finished metal plate.

[0137] The S6 sintering process includes the following steps:

[0138] The semi-finished metal plate covered with the powdered covering is placed on the surface of the refractory bricks and sintered in a box furnace at a temperature of 850°C for 15 minutes.

[0139] After sintering, the sample was cooled naturally to room temperature to obtain a dark green enamel heating plate.

[0140] Example 6:

[0141] A household enamel heating plate comprises a metal layer, an enamel layer and a graphene coating. The preparation method of the heating plate comprises the following steps:

[0142] S1. Obtain a metal plate of a specified size and shape, and pre-treat the metal plate to obtain a pre-treated metal plate;

[0143] S2, preparation of conductive fibers, using cellulose pulp and graphene to react to prepare conductive fibers;

[0144] S3, the conductive fibers are placed at a preset position on the surface of the metal plate to form a coplanar, semi-finished metal plate;

[0145] S4, preparing enamel material, mixing enamel raw materials to obtain enamel material;

[0146] S5, enamel coating, coating the obtained enamel material on the surface of the pretreated metal plate;

[0147] S6, sintering, sintering the metal plate coated with the enamel material to obtain an enameled heating plate;

[0148] S7, graphene coating, coating the graphene coating on the sintered enamel surface to obtain the final product.

[0149] The metal plate pretreatment process in S1 is:

[0150] First, use 100# sandpaper to polish for 10 minutes, then use 200# sandpaper to polish until there are no obvious scratches on the surface;

[0151] Use acetone solution for cleaning, the cleaning time is 20 minutes, and after cleaning, put it into the drying box for drying, and the drying temperature is controlled at 85-95℃.

[0152] The S4 enamel material preparation process includes the following steps:

[0153] Preparation of enamel glaze: weighing powder for enamel glaze, comprising the following components by mass: 32% silicon oxide, 50% boric acid, 5% aluminum oxide, 11% sodium carbonate, and 2% zirconium oxide, and filtering the powder. The raw materials were placed in a ball mill and uniformly mixed for 35 minutes. The mixed raw materials were placed in a corundum crucible, and the temperature of a box-type high-temperature furnace was controlled to be raised to 1460° C. and smelted for 1.5 hours to obtain a uniform melt. The enamel glaze was then quenched in water to obtain a block-shaped enamel glaze.

[0154] Preparation of enamel material: The obtained block enamel glaze is placed in a drying oven at 210°C for drying, and then placed in a ball mill for crushing. The ball milling process lasts for 68 hours to obtain fine enamel powder. The enamel powder is passed through a 200-mesh sieve to obtain sieved enamel powder. Anhydrous ethanol is added to the enamel powder, and after sufficient stirring for 2 hours, cobalt oxide, nickel oxide and clay are added to the solution. The ball milling is continued for 100 hours to obtain the enamel material.

[0155] The enamel coating process in S5 includes the following steps:

[0156] Heat the semi-finished metal plate to 75-82℃, clamp the semi-finished metal plate and place it into the enamel material, so that the semi-finished metal plate is completely immersed in the enamel material;

[0157] The semi-finished metal plate is taken out from the enamel material, and the residual heat of the semi-finished metal plate dries the enamel material, and finally a powdery covering layer is formed on the surface of the semi-finished metal plate.

[0158] The S6 sintering process includes the following steps:

[0159] The semi-finished metal plate covered with the powdered covering layer was placed on the surface of the refractory bricks and sintered in a box furnace at a temperature of 850°C for 16.5 minutes.

[0160] After sintering, the sample was cooled naturally to room temperature to obtain a dark green enamel heating plate.

[0161] Example 7:

[0162] A household enamel heating plate comprises a metal layer, an enamel layer and a graphene coating. The preparation method of the heating plate comprises the following steps:

[0163] S1. Obtain a metal plate of a specified size and shape, and pre-treat the metal plate to obtain a pre-treated metal plate;

[0164] S2, preparation of conductive fibers, using cellulose pulp and graphene to react to prepare conductive fibers;

[0165] S3, the conductive fibers are placed at a preset position on the surface of the metal plate to form a coplanar, semi-finished metal plate;

[0166] S4, preparing enamel material, mixing enamel raw materials to obtain enamel material;

[0167] S5, enamel coating, coating the obtained enamel material on the surface of the pretreated metal plate;

[0168] S6, sintering, sintering the metal plate coated with the enamel material to obtain an enameled heating plate;

[0169] S7, graphene coating, coating the graphene coating on the sintered enamel surface to obtain the final product.

[0170] The metal plate pretreatment process in S1 is:

[0171] First, use 100# sandpaper to polish for 10 minutes, then use 200# sandpaper to polish until there are no obvious scratches on the surface;

[0172] Use acetone solution for cleaning, the cleaning time is 20 minutes, and after cleaning, put it into the drying box for drying, and the drying temperature is controlled at 85-95℃.

[0173] The S4 enamel material preparation process includes the following steps:

[0174] Preparation of enamel glaze: weighing powder for enamel glaze, comprising the following components by mass: 32% silicon oxide, 50% boric acid, 5% aluminum oxide, 11% sodium carbonate, and 2% zirconium oxide, and filtering the powder. The raw materials were placed in a ball mill and uniformly mixed for 35 minutes. The mixed raw materials were placed in a corundum crucible, and the temperature of a box-type high-temperature furnace was controlled to be raised to 1460° C. and smelted for 1.5 hours to obtain a uniform melt. The enamel glaze was then quenched in water to obtain a block-shaped enamel glaze.

[0175] Preparation of enamel material: The obtained block enamel glaze is placed in a drying oven at 210°C for drying, and then placed in a ball mill for crushing. The ball milling process lasts for 68 hours to obtain fine enamel powder. The enamel powder is passed through a 200-mesh sieve to obtain sieved enamel powder. Anhydrous ethanol is added to the enamel powder, and after sufficient stirring for 2 hours, cobalt oxide, nickel oxide and clay are added to the solution. The ball milling is continued for 100 hours to obtain the enamel material.

[0176] The enamel coating process in S5 includes the following steps:

[0177] Heat the semi-finished metal plate to 75-82℃, clamp the semi-finished metal plate and place it into the enamel material, so that the semi-finished metal plate is completely immersed in the enamel material;

[0178] The semi-finished metal plate is taken out from the enamel material, and the residual heat of the semi-finished metal plate dries the enamel material, and finally a powdery covering layer is formed on the surface of the semi-finished metal plate.

[0179] The S6 sintering process includes the following steps:

[0180] The semi-finished metal plate covered with the powdered covering is placed on the surface of the refractory bricks and sintered in a box furnace at a temperature of 850°C for 18 minutes.

[0181] After sintering, the sample was cooled naturally to room temperature to obtain a dark green enamel heating plate.

[0182] Example 8:

[0183] A household enamel heating plate comprises a metal layer, an enamel layer and a graphene coating. The preparation method of the heating plate comprises the following steps:

[0184] S1. Obtain a metal plate of a specified size and shape, and pre-treat the metal plate to obtain a pre-treated metal plate;

[0185] S2, preparation of conductive fibers, using cellulose pulp and graphene to react to prepare conductive fibers;

[0186] S3, the conductive fibers are placed at a preset position on the surface of the metal plate to form a coplanar, semi-finished metal plate;

[0187] S4, preparing enamel material, mixing enamel raw materials to obtain enamel material;

[0188] S5, enamel coating, coating the obtained enamel material on the surface of the pretreated metal plate;

[0189] S6, sintering, sintering the metal plate coated with the enamel material to obtain an enameled heating plate;

[0190] S7, graphene coating, coating the graphene coating on the sintered enamel surface to obtain the final product.

[0191] The metal plate pretreatment process in S1 is:

[0192] First, use 100# sandpaper to polish for 10 minutes, then use 200# sandpaper to polish until there are no obvious scratches on the surface;

[0193] Use acetone solution for cleaning, the cleaning time is 20 minutes, and after cleaning, put it into the drying box for drying, and the drying temperature is controlled at 85-95℃.

[0194] The S4 enamel material preparation process includes the following steps:

[0195] Preparation of enamel glaze: weighing powder for enamel glaze, comprising the following components by mass: 32% silicon oxide, 50% boric acid, 5% aluminum oxide, 11% sodium carbonate, and 2% zirconium oxide, and filtering the powder. The raw materials were placed in a ball mill and uniformly mixed for 35 minutes. The mixed raw materials were placed in a corundum crucible, and the temperature of a box-type high-temperature furnace was controlled to be raised to 1460° C. and smelted for 1.5 hours to obtain a uniform melt. The enamel glaze was then quenched in water to obtain a block-shaped enamel glaze.

[0196] Preparation of enamel material: The obtained block enamel glaze is placed in a drying oven at 210°C for drying, and then placed in a ball mill for crushing. The ball milling process lasts for 68 hours to obtain fine enamel powder. The enamel powder is passed through a 200-mesh sieve to obtain sieved enamel powder. Anhydrous ethanol is added to the enamel powder, and after sufficient stirring for 2 hours, cobalt oxide, nickel oxide and clay are added to the solution. The ball milling is continued for 100 hours to obtain the enamel material.

[0197] The enamel coating process in S5 includes the following steps:

[0198] Heat the semi-finished metal plate to 75-82℃, clamp the semi-finished metal plate and place it into the enamel material, so that the semi-finished metal plate is completely immersed in the enamel material;

[0199] The semi-finished metal plate is taken out from the enamel material, and the residual heat of the semi-finished metal plate dries the enamel material, and finally a powdery covering layer is formed on the surface of the semi-finished metal plate.

[0200] The S6 sintering process includes the following steps:

[0201] The semi-finished metal plate covered with the powdered covering layer is placed on the surface of the refractory bricks and sintered in a box furnace at a temperature of 850°C for 20 minutes.

[0202] After sintering, the sample was cooled naturally to room temperature to obtain a dark green enamel heating plate.

[0203] From Examples 5-8, the following table is obtained:

[0204] Sintering time (min) Impact resistance Example 5 15 4.8 Example 6 16.5 4.6 Example 7 18 4.2 Example 8 20 4.25

[0205] Impact resistance: The sintered enamel heating plate is impacted by an impact machine. After observing the appearance after the impact, the impact resistance level is divided into 5 levels, with level 5 being the worst and level 1 being the best.

[0206] Secondly: The drawings of the embodiments disclosed in the present invention only involve structures related to the embodiments disclosed in the present invention. Other structures may refer to conventional designs. The same embodiment and different embodiments of the present invention may be combined with each other without conflict.

[0207] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A household enamel heating plate, comprising a metal layer, an enamel layer and a graphene coating, characterized in that: The preparation method of the heating plate comprises the following steps: S1. Obtain a metal plate of a specified size and shape, and pre-treat the metal plate to obtain a pre-treated metal plate; S2, preparation of conductive fibers, using cellulose pulp and graphene to react to prepare conductive fibers; S3, the conductive fibers are placed at a preset position on the surface of the metal plate to form a coplanar, semi-finished metal plate; S4, preparing enamel material, mixing enamel raw materials to obtain enamel material; S5, enamel coating, coating the obtained enamel material on the surface of the pretreated metal plate; S6, sintering, sintering the metal plate coated with the enamel material to obtain an enameled heating plate; S7, graphene coating, coating the graphene coating on the sintered enamel surface to obtain the final product.

2. A household enamel heating plate according to claim 1, characterized in that: The metal plate pretreatment process in S1 is as follows: First, use 100# sandpaper to polish for 10 minutes, then use 200# sandpaper to polish until there are no obvious scratches on the surface; Use acetone solution for cleaning, the cleaning time is 20 minutes, and after cleaning, put it into the drying box for drying, and the drying temperature is controlled at 85-95℃.

3. A household enamel heating plate according to claim 1, characterized in that: The S4 enamel material preparation process comprises the following steps: Preparation of enamel glaze: weighing powder for enamel glaze, comprising the following components by mass: 32% silicon oxide, 50% boric acid, 5% aluminum oxide, 11% sodium carbonate, and 2% zirconium oxide, and filtering the powder. The raw materials were placed in a ball mill and uniformly mixed for 35 minutes. The mixed raw materials were placed in a corundum crucible, and the temperature of a box-type high-temperature furnace was controlled to be raised to 1460° C. and smelted for 1.5 hours to obtain a uniform melt. The enamel glaze was then quenched in water to obtain a block-shaped enamel glaze. Preparation of enamel material: The obtained block enamel glaze is placed in a drying oven at 210°C for drying, and then placed in a ball mill for crushing. The ball milling process lasts for 68 hours to obtain fine enamel powder. The enamel powder is passed through a 200-mesh sieve to obtain sieved enamel powder. Anhydrous ethanol is added to the enamel powder, and after sufficient stirring for 2 hours, cobalt oxide, nickel oxide and clay are added to the solution. The ball milling is continued for 100 hours to obtain the enamel material.

4. A household enamel heating plate according to claim 1, characterized in that: The enamel coating process in S5 comprises the following steps: Heat the semi-finished metal plate to 75-82℃, clamp the semi-finished metal plate and place it into the enamel material, so that the semi-finished metal plate is completely immersed in the enamel material; The semi-finished metal plate is taken out from the enamel material, and the residual heat of the semi-finished metal plate dries the enamel material, and finally a powdery covering layer is formed on the surface of the semi-finished metal plate.

5. The household enamel heating plate according to claim 1, characterized in that: The S6 sintering process includes the following steps: Place the semi-finished metal plate covered with powdery coating on the surface of refractory bricks and sinter it in a box furnace at a temperature of 850-950℃ for 15-20 minutes. After sintering, the sample was cooled naturally to room temperature to obtain a dark green enamel heating plate.

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