Production process for magnetically conductive non-stick ceramic cooking appliance

Abstract

A production process for a magnetically conductive non-stick ceramic cooking appliance, comprising the following steps: 1) firing a ceramic green body at a high temperature to form a ceramic biscuit (1) of which the inner surface is not glazed yet; 2) carrying out sand blasting treatment on the inner surface of the ceramic biscuit (1); 3) using a blower gun to blow air towards and clean the inner surface of the ceramic biscuit (1); 4) preheating the cleaned ceramic biscuit (1) at a temperature of 90-110°C; 5) coating the inner surface of the ceramic biscuit (1) with a magnetically conductive material in a hot melting processing mode to form a magnetically conductive layer (2); 6) roughening the magnetically conductive layer (2) to increase the adhesion of the surface of the magnetically conductive layer (2); 7) preheating the whole ceramic biscuit (1) having the magnetically conductive layer (2) at a temperature of 45-55°C; 8) after preheating, spray coating the inner surface of the ceramic biscuit (1) and the surface of the magnetically conductive layer (2) with an inner protective layer (3), and spray coating the outer surface of the ceramic biscuit (1) with an outer protective layer (4); 9) spray coating the inner surface of the inner protective layer (3) with a functional glaze layer (5); and 10) firing the whole appliance at the temperature of 250-350°C for 15-20 minutes to manufacture the magnetically conductive non-stick ceramic cooking appliance.

Description

Production process of magnetic non-stick ceramic cooking utensils Technical Field

[0001] The invention relates to cooking utensils, and in particular to a production process of magnetic non-stick ceramic cooking utensils. Background Art

[0002] Ceramic materials lack the magnetic conductivity of metals, limiting their use in induction cooktops. Currently, the primary process for producing magnetic ceramic cookware involves baking a magnetic film directly onto the bottom of the ceramic, or applying a film to the ceramic body, followed by a glazing process and finally firing.

[0003] Patent applications with publication numbers CN105310460A and CN105310510A respectively disclose a method for manufacturing a ceramic pot, both of which are characterized in that a magnetic conductive electric heating film is pasted on the inner bottom surface of the ceramic pot and covered with a glaze layer. This approach has two disadvantages: first, the magnetic conductive electric heating film is pasted on the inner bottom surface of the ceramic pot, and the magnetic induction efficiency and thermal conductivity efficiency are low; second, the magnetic conductive electric heating film is a shaping film layer. After the shaping film layer is pasted on the inner bottom surface of the ceramic pot, the glaze is coated on the shaping film layer. The glaze and the shaping film layer cannot penetrate each other, which easily causes the glaze surface to crack, thereby resulting in uneven mechanical strength of the ceramic pot bottom and the pot body. Once impacted, the ceramic pot bottom will crack before the pot body.

[0004] Application No. ZL200310103236.X discloses a ceramic pot for an induction cooker, which is characterized in that a layer of magnetic conductive electric heating film is applied on the outer bottom surface of the ceramic pot. The disadvantage of this approach is that the external magnetic conductive electric heating film is not protected, is easily scratched, and has a short service life. Summary of the Invention

[0005] The problem to be solved by the present invention is to provide a production process for magnetic non-stick ceramic cooking utensils, which can increase the mechanical strength of the ceramic cooking utensils and improve the magnetic conductivity efficiency.

[0006] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0007] A production process for magnetic non-stick ceramic cooking utensils, characterized by comprising the following steps:

[0008] 1) forming a ceramic green body by slip casting or roll forming of a ceramic material, and firing the ceramic green body at a high temperature to form a ceramic body with an unglazed inner surface;

[0009] 2) Sandblast the inner surface of the ceramic blank to ensure that the cleanliness level of the inner surface of the ceramic blank reaches Sa2.5 and the roughness of the inner surface of the ceramic blank is between Ra2.5 and Ra3.0;

[0010] 3) Use an air gun to blow air to clean the inner surface of the ceramic blank;

[0011] 4) Preheating the cleaned ceramic blank at a temperature of 90°C-110°C;

[0012] 5) coating the magnetic conductive material on the inner surface of the ceramic blank by hot-melt processing, and the magnetic conductive material at least covers the bottom of the inner surface of the ceramic blank, forming a magnetic conductive layer on the inner surface of the ceramic blank;

[0013] 6) Roughening the magnetic conductive layer to increase the adhesion of the magnetic conductive layer surface;

[0014] 7) Preheating the entire ceramic blank with the magnetic conductive layer at a temperature of 45°C-55°C;

[0015] 8) After preheating, spray an inner protective layer on the inner surface of the ceramic blank and the surface of the magnetic conductive layer, and spray an outer protective layer on the outer surface of the ceramic blank;

[0016] 9) spraying a functional glaze layer on the inner surface of the inner protective layer;

[0017] 10) Firing the entire utensil at a temperature of 250° C. to 350° C. for 15 to 20 minutes to obtain the magnetic non-stick ceramic cooking utensil.

[0018] In step 1), the inner surface of the ceramic blank is not covered with glaze, and the inner surface roughness of the ceramic blank is relatively high, which provides a better mechanical anchoring effect for the magnetic material, allowing the magnetic material to directly contact the ceramic blank, enhancing the adhesion of the magnetic material to the ceramic blank, providing a good foundation for subsequent magnetic material coating operations, and enhancing the bonding and stability between the magnetic material and the ceramic blank. Because the ceramic blank is fired at high temperature, its inner surface is unglazed, which can better withstand the preheating temperature before the magnetic material is sprayed, thereby increasing the heat resistance and stability of the magnetic layer.

[0019] In step 2), sandblasting uses compressed air as a power source to form a high-speed jet beam that sprays a material (copper ore sand, quartz sand, corundum, iron sand, or sea sand) onto the surface of the workpiece being treated, thereby changing the surface appearance or shape of the workpiece. The impact and cutting action of the material on the workpiece surface imparts a certain degree of cleanliness and varying degrees of roughness to the workpiece surface, improving the mechanical properties of the workpiece surface. This enhances the fatigue resistance of the workpiece, increases the adhesion between the workpiece surface and the coating, prolongs the durability of the coating, and facilitates the leveling and decorative properties of the coating. Sandblasting the inner surface of the ceramic blank removes impurities such as dirt and oxides from the inner surface of the ceramic blank, increases surface cleanliness and surface roughness, and enhances the adhesion of the magnetic material.

[0020] In the above step 3), using an air gun to blow air towards the inner surface of the ceramic blank to clean it can further remove impurities on the surface of the ceramic blank and ensure the quality of the magnetic conductive layer.

[0021] In the above step 4), the cleaned ceramic blank is preheated at 90°C-110°C. This preheating enables the molten magnetic conductive material in step 5) to react with the high-temperature surface of the ceramic blank to form a more stable chemical bond and crystal structure, thereby improving the thermal stability and heat resistance of the magnetic conductive layer.

[0022] In the above step 5), the magnetic material can be applied in a molten state by hot melting, so that the magnetic material is evenly coated on the inner surface of the ceramic blank, so that the magnetic material can better contact and adhere to the inner surface of the ceramic blank, thereby improving the bonding strength between the magnetic material and the ceramic blank and reducing the possibility of the magnetic layer falling off.

[0023] In the above step 6), the magnetic conductive layer is roughened to provide a clean surface of the magnetic conductive layer for subsequent processing steps.

[0024] In the above step 7), the entire ceramic blank with the magnetic conductive layer is preheated at a temperature of 45°C-55°C. This preheating enables the inner protective layer in step 8) to form a more stable chemical bonding layer with the inner surface of the ceramic blank, and the outer protective layer to form an outer surface of the ceramic blank, thereby improving the adhesion between the inner protective layer and the inner surface of the ceramic blank, and between the outer protective layer and the outer surface of the ceramic blank.

[0025] In step 8), spraying the inner protective layer on the inner surface of the ceramic blank and the surface of the magnetically conductive layer increases the mechanical strength of the ceramic cookware, reduces the risk of cracking the bottom of the ceramic cookware when impacted, and improves the durability of the ceramic cookware. The inner protective layer also effectively protects the magnetically conductive layer, reducing scratches on the magnetically conductive layer and extending the service life of the ceramic cookware. Spraying the outer protective layer on the outer surface of the ceramic blank effectively protects the outer surface of the ceramic blank.

[0026] In the above step 9), spraying a functional glaze layer on the inner surface of the inner protective layer can reduce the adhesion of food during the cooking process, prevent food from sticking to the ceramic cooking utensils, improve the cleanability and durability of the ceramic cooking utensils, and protect the inner protective layer, thereby improving the quality and service life of the ceramic cooking utensils.

[0027] The preheating treatment in step 7) and the firing in step 10) can both be performed in a baking furnace or a tunnel oven.

[0028] In a preferred embodiment, in step 5), the magnetic conductive layer comprises a top layer and a bottom layer, wherein the bottom layer is applied to the inner surface of the ceramic blank, and the top layer is applied to the upper surface of the bottom layer. The top layer is applied to the upper surface of the bottom layer, and the bottom layer serves as a foundation for the magnetic conductive layer, providing good support and load-bearing capacity for the top layer.

[0029] In a further preferred embodiment, in step 5), the base layer is first applied to the inner surface of the ceramic blank. After the base layer cools to a certain degree, the top layer is applied to the upper surface of the base layer. This arrangement allows the top layer and the base layer to fuse together, forming a mutually penetrating bonding layer, thereby enhancing the bonding between the top layer and the base layer.

[0030] In a further preferred embodiment, in step 5), when the surface temperature of the bottom layer is annealed to 500° C.-600° C., the top layer is coated on the upper surface of the bottom layer.

[0031] In a further preferred embodiment, in step 5), the magnetic conductive material is prepared by mixing the following raw materials in parts by weight: 10-20 parts silver powder, 20-30 parts aluminum powder, 10-15 parts titanium powder, 15-20 parts cobalt powder, and 10-20 parts nickel powder. The magnetic conductive material comprises silver powder, aluminum powder, titanium powder, cobalt powder, and nickel powder. These different metal powders play different roles in the magnetic conductive material: silver powder has high electrical and thermal conductivity; aluminum powder and titanium powder enhance the magnetic properties of silver powder; and cobalt powder and nickel powder further increase the magnetic permeability of the magnetic conductive material. The mixing of these various metal powders improves the uniformity and consistency of the magnetic conductive material, ensuring ideal magnetic properties during the coating and sintering processes.

[0032] In a further preferred embodiment, the top layer is made from a mixture of the following raw materials in parts by weight: 10-15 parts titanium powder and 5-10 parts silver powder; the bottom layer is made from a mixture of the following raw materials in parts by weight: 5-10 parts silver powder, 15-20 parts cobalt powder, 20-30 parts aluminum powder, and 10-20 parts nickel powder. The top layer, containing titanium and silver, and the bottom layer, containing silver, cobalt, aluminum, and nickel, both have high magnetic permeability and electrical conductivity, effectively distributing and conducting magnetic energy, improving magnetic conductivity, and enhancing the magnetic coupling efficiency between the electromagnetic coil and the ceramic pot body.

[0033] In a preferred embodiment, the magnetic conductive material in step 5) covers at least the entire inner surface of the ceramic blank from the bottom to the upper portion of the sidewalls. This arrangement increases the coverage of the magnetic conductive layer on the inner surface of the ceramic blank, completely covering areas that may come into contact with the induction cooker during cooking. This effectively enhances the magnetic conductive layer's magnetic conductivity in the induction cooker, improving cooking efficiency and uniformity.

[0034] In a further preferred embodiment, in step 5), the magnetic conductive layer extends from bottom to top to cover at least one quarter of the side wall of the inner surface of the ceramic blank.

[0035] In a preferred embodiment, in step 5), the thickness of the magnetic conductive layer is in the range of 0.05 mm to 1.00 mm. The thickness of the magnetic conductive layer is determined by the rated power, and the power is directly proportional to the thickness. The thickness range is approximately between 0.05 mm and 1.00 mm.

[0036] In a preferred embodiment, in step 6), the roughening treatment comprises the following steps:

[0037] 6-1) Use an air gun to clean the magnetic conductive layer for the first time;

[0038] 6-2) Sandblast the magnetic layer to ensure that the surface cleanliness level of the magnetic layer reaches Sa2.5 and the surface roughness of the magnetic layer is between Ra2.5 and Ra3.0;

[0039] 6-3) Use an air gun to clean the magnetic layer for the second time.

[0040] Step 6-1) above removes impurities and dust from the magnetic layer, providing a clean surface for subsequent processing. Step 6-2) above further increases the surface roughness of the magnetic layer, enhancing the friction between the magnetic layer and other material layers during subsequent processing, and improving the adhesion of the magnetic layer. Step 6-3) above removes particles and impurities remaining on the magnetic layer after sandblasting, ensuring a clean and smooth surface for subsequent processing.

[0041] In a preferred embodiment, in step 8), both the inner and outer protective layers are glaze layers. The glaze layers are primarily composed of oxides and silicates, such as SiO2. These glaze layers are used as surface coatings for ceramic products, increasing their hardness, wear resistance, and aesthetics. High-temperature sintering is required to form a hard surface coating that creates a smooth surface.

[0042] In a further preferred embodiment, in step 8), the thickness of the inner protective layer and the outer protective layer are both in the range of 40 μm to 50 μm.

[0043] In a preferred embodiment, in step 9), the material of the functional glaze layer is SiO2. The SiO2 can be prepared by a sol-gel method and has a non-stick property.

[0044] In a further preferred embodiment, in step 9), the thickness of the functional glaze layer is in the range of 20 μm to 30 μm.

[0045] Compared with the prior art, the present invention has the following advantages:

[0046] 1) The unglazed inner surface of the ceramic blank of the present invention can enhance the adhesion of the magnetic conductive material, provide a good foundation for the subsequent coating operation of the magnetic conductive material, and enhance the bonding strength and stability between the magnetic conductive material and the ceramic blank.

[0047] 2) The present invention uses preheating to provide a prerequisite for subsequent hot-melt coating, so that the molten magnetic material reacts with the high-temperature surface of the ceramic blank to form a more stable chemical bond and crystal structure, thereby improving the thermal stability and heat resistance of the magnetic layer, improving the uniformity and consistency of the magnetic layer, and ensuring that the magnetic performance remains consistent across the entire surface of the device.

[0048] 3) The present invention provides a magnetic conductive layer on the bottom of the ceramic cooking utensil and a certain area from the bottom to the side wall, so that the magnetic non-stick ceramic cooking utensil has magnetic conductivity, improves the magnetic conductivity efficiency, and can better meet the heating requirements of the induction cooker.

[0049] 4) The present invention can effectively protect the inner and outer surfaces of the ceramic blank by coating the protective layer on the inner and outer surfaces of the ceramic blank, reduce the scratching of the magnetic conductive layer, and extend the service life of the ceramic cooking utensil. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] FIG1 is a schematic structural diagram of embodiment 1 of the present invention;

[0051] FIG2 is an enlarged schematic diagram of A in FIG1 . DETAILED DESCRIPTION

[0052] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] Example 1, as shown in Figures 1-2, the production process of the magnetic non-stick ceramic cooking utensil in this embodiment includes the following steps:

[0054] 1) forming a ceramic green body by slip casting or rolling, and firing the ceramic green body at a high temperature to form a ceramic green body 1 with an unglazed inner surface;

[0055] 2) sandblasting the inner surface of the ceramic blank 1 to ensure that the cleanliness level of the inner surface of the ceramic blank 1 reaches Sa2.5 and the roughness of the inner surface of the ceramic blank 1 is between Ra2.5 and Ra3.0;

[0056] 3) Use an air gun to blow air to clean the inner surface of the ceramic blank 1;

[0057] 4) preheating the cleaned ceramic blank 1 at 100° C.;

[0058] 5) coating the magnetic conductive material on the inner surface of the ceramic blank 1 by hot-melt processing, and the magnetic conductive material at least covers the bottom of the inner surface of the ceramic blank 1, forming a magnetic conductive layer 2 on the inner surface of the ceramic blank 1;

[0059] 6) Roughening the magnetic conductive layer 2 to increase the surface adhesion of the magnetic conductive layer 2;

[0060] 7) Preheating the entire ceramic blank 1 with the magnetic conductive layer 2 at a temperature of 50° C.;

[0061] 8) After preheating, spray an inner protective layer 3 on the inner surface of the ceramic blank 1 and the surface of the magnetic conductive layer 2, and spray an outer protective layer 4 on the outer surface of the ceramic blank 1;

[0062] 9) Spraying a functional glaze layer 5 on the inner surface of the inner protective layer 3;

[0063] 10) The entire utensil is fired at 300° C. for 15-20 minutes to obtain the magnetic non-stick ceramic cooking utensil.

[0064] In step 1) above, the inner surface of the ceramic blank 1 is not covered with glaze, and the inner surface roughness of the ceramic blank 1 is relatively high, which provides a better mechanical anchoring effect for the magnetic material, allowing the magnetic material to directly contact the ceramic blank 1, enhancing the adhesion of the magnetic material to the ceramic blank 1, providing a good foundation for subsequent magnetic material coating operations, and enhancing the bonding strength and stability between the magnetic material and the ceramic blank 1. Because the ceramic blank 1 is fired at a high temperature, its inner surface is unglazed, which can better withstand the preheating temperature before the magnetic material is sprayed, thereby increasing the heat resistance and stability of the magnetic layer 2.

[0065] In step 2), sandblasting utilizes compressed air as a power source to form a high-speed jet beam that sprays a material (copper ore sand, quartz sand, corundum, iron sand, or sea sand) onto the surface of the workpiece being treated, thereby changing the surface appearance or shape of the workpiece. The impact and cutting action of the material on the workpiece surface imparts a certain degree of cleanliness and varying degrees of roughness to the workpiece surface, improving the mechanical properties of the workpiece surface. This enhances the fatigue resistance of the workpiece, increases the adhesion between the workpiece surface and the coating, prolongs the durability of the coating, and facilitates the leveling and decorative properties of the coating. Sandblasting the inner surface of the ceramic blank 1 removes impurities such as dirt and oxides from the inner surface of the ceramic blank 1, increases surface cleanliness and surface roughness, and enhances the adhesion of the magnetically conductive material.

[0066] In the above step 3), an air gun is used to blow air towards the inner surface of the ceramic blank 1 to clean it, which can further remove impurities on the surface of the ceramic blank 1 and ensure the quality of the magnetic conductive layer 2 .

[0067] In the above step 4), the cleaned ceramic blank 1 is preheated at 100°C. This preheating allows the molten magnetic material in step 5) to react with the high-temperature surface of the ceramic blank 1 to form a more stable chemical bond and crystal structure, thereby improving the thermal stability and heat resistance of the magnetic layer 2.

[0068] In the above step 5), the magnetic material can be applied in a molten state by hot melting, so that the magnetic material is evenly coated on the inner surface of the ceramic blank 1, so that the magnetic material can better contact and adhere to the inner surface of the ceramic blank 1, thereby improving the bonding strength between the magnetic material and the ceramic blank 1 and reducing the possibility of the magnetic layer 2 falling off.

[0069] In the above step 6), the magnetic conductive layer 2 is roughened to provide a clean surface of the magnetic conductive layer 2 for subsequent processing steps.

[0070] In the above step 7), the entire ceramic blank 1 with the magnetic conductive layer 2 is preheated at a temperature of 50°C. This preheating enables the inner protective layer 3 and the inner surface of the ceramic blank 1, and the outer protective layer 4 and the outer surface of the ceramic blank 1 in step 8) to form a more stable chemical bonding layer, thereby improving the adhesion between the inner protective layer 3 and the inner surface of the ceramic blank 1, and between the outer protective layer 4 and the outer surface of the ceramic blank 1.

[0071] In step 8), spraying the inner protective layer 3 on the inner surface of the ceramic blank 1 and the surface of the magnetic conductive layer 2 increases the mechanical strength of the ceramic cookware, reduces the risk of cracking the bottom of the ceramic cookware when impacted, and improves the durability of the ceramic cookware. The inner protective layer 3 also effectively protects the magnetic conductive layer 2, reducing scratches on the magnetic conductive layer 2 and extending the service life of the ceramic cookware. Spraying the outer protective layer 4 on the outer surface of the ceramic blank 1 effectively protects the outer surface of the ceramic blank 1.

[0072] In the above step 9), the functional glaze layer 5 is sprayed on the inner surface of the inner protective layer 3, which can reduce the adhesion of food during the cooking process, prevent food from sticking to the ceramic cooking utensils, improve the cleanability and durability of the ceramic cooking utensils, and protect the inner protective layer 3, thereby improving the quality and service life of the ceramic cooking utensils.

[0073] The preheating treatment in step 7) and the firing in step 10) can both be performed in a baking furnace or a tunnel oven.

[0074] In step 5), the magnetic conductive layer 2 includes a surface layer 21 and a bottom layer 22. The bottom layer 22 is coated on the inner surface of the ceramic blank 1, and the surface layer 21 is coated on the upper surface of the bottom layer 22. The surface layer 21 is coated on the upper surface of the bottom layer 22. The bottom layer 22 serves as the foundation layer of the magnetic conductive layer 2 and can provide good support and load-bearing capacity for the surface layer 21.

[0075] In step 5), the bottom layer 22 is first coated on the inner surface of the ceramic blank 1. After the bottom layer 22 cools to a certain degree, the surface layer 21 is coated on the upper surface of the bottom layer 22. This arrangement allows the surface layer 21 and the bottom layer 22 to melt into each other, forming a mutually penetrating bonding layer, thereby enhancing the bonding between the surface layer 21 and the bottom layer 22.

[0076] In step 5), when the surface temperature of the bottom layer 22 is annealed to 500° C., the surface layer 21 is coated on the upper surface of the bottom layer 22 .

[0077] In step 5), the magnetic material is prepared by mixing the following raw materials in parts by weight: 10 parts silver powder, 20 parts aluminum powder, 10 parts titanium powder, 15 parts cobalt powder, and 10 parts nickel powder. The magnetic material is composed of silver, aluminum, titanium, cobalt, and nickel powders. These different metal powders play different roles in the magnetic material: silver powder has high electrical and thermal conductivity; aluminum and titanium powders enhance the magnetic properties of silver powder; and cobalt and nickel powders further increase the magnetic permeability of the magnetic material. This blend of metal powders improves the uniformity and consistency of the magnetic material, ensuring ideal magnetic properties during the coating and sintering processes.

[0078] The surface layer 21 is made from a mixture of the following raw materials in parts by weight: 10 parts titanium powder and 5 parts silver powder; the bottom layer 22 is made from a mixture of the following raw materials in parts by weight: 5 parts silver powder, 15 parts cobalt powder, 20 parts aluminum powder, and 10 parts nickel powder. The surface layer 21, containing titanium and silver, and the bottom layer 22, containing silver, cobalt, aluminum, and nickel, both have high magnetic permeability and electrical conductivity, effectively distributing and conducting magnetic energy, improving magnetic conductivity and enhancing the magnetic coupling efficiency between the electromagnetic coil and the ceramic pot body.

[0079] Step 5) The magnetic conductive material is applied to at least the entire inner surface of the ceramic blank 1 from the bottom to the upper portion of the sidewalls. This arrangement increases the coverage of the magnetic conductive layer 2 on the inner surface of the ceramic blank 1, completely covering the area that may come into contact with the induction cooker during cooking. This effectively enhances the magnetic conductivity of the magnetic conductive layer 2 in the induction cooker, improving cooking efficiency and uniformity.

[0080] In step 5), the thickness of the magnetic conductive layer 2 is 0.10 mm.

[0081] In step 6), the roughening process includes the following steps:

[0082] 6-1) Use an air gun to perform the first air cleaning on the magnetic conductive layer 2;

[0083] 6-2) sandblasting the magnetic conductive layer 2 to ensure that the surface cleanliness level of the magnetic conductive layer 2 reaches Sa2.5 and the surface roughness of the magnetic conductive layer 2 is between Ra2.5 and Ra3.0;

[0084] 6-3) Use an air gun to clean the magnetic conductive layer 2 for the second time.

[0085] Step 6-1) above can remove impurities, dust, and the like from the magnetic permeable layer 2, providing a clean surface for subsequent processing. Step 6-2) above can further increase the surface roughness of the magnetic permeable layer 2, enhancing the friction between the magnetic permeable layer 2 and other material layers during subsequent processing, and improving the adhesion of the magnetic permeable layer 2. Step 6-3) above can remove particles and impurities remaining on the magnetic permeable layer 2 after sandblasting, ensuring a clean and smooth surface for subsequent processing.

[0086] In step 8), both inner protective layer 3 and outer protective layer 4 are glaze layers. The glaze layers are primarily composed of oxides and silicates, such as SiO2. These glaze layers are used as surface coatings for ceramic products, increasing their hardness, wear resistance, and aesthetics. High-temperature sintering is required to form a hard, smooth surface coating.

[0087] In step 8), the thickness of the inner protective layer 3 and the outer protective layer 4 are both 40 μm.

[0088] In step 9), the material of the functional glaze layer 5 is SiO 2 . The SiO 2 can be prepared by a sol-gel method and has a non-stick property.

[0089] In step 9), the thickness of the functional glaze layer is 20 μm.

[0090] Example 2: The production process of the magnetic non-stick ceramic cooking utensil in this example differs from that in Example 1 in that:

[0091] In step 5), the magnetic conductive material is prepared by mixing the following raw materials in parts by weight: 15 parts of silver powder, 25 parts of aluminum powder, 12 parts of titanium powder, 17 parts of cobalt powder, and 15 parts of nickel powder.

[0092] The surface layer 21 is made by mixing the following raw materials in parts by weight: 12 parts titanium powder and 7 parts silver powder; the bottom layer 22 is made by mixing the following raw materials in parts by weight: 8 parts silver powder, 17 parts cobalt powder, 25 parts aluminum powder, and 15 parts nickel powder.

[0093] Example 3: The production process of the magnetic non-stick ceramic cooking utensil in this example differs from that in Example 1 in that:

[0094] In the step 5), the magnetic conductive material is prepared by mixing the following raw materials in parts by weight: 20 parts of silver powder, 30 parts of aluminum powder, 15 parts of titanium powder, 20 parts of cobalt powder, and 20 parts of nickel powder.

[0095] The surface layer 21 is made by mixing the following raw materials in parts by weight: 15 parts of titanium powder and 10 parts of silver powder; the bottom layer 22 is made by mixing the following raw materials in parts by weight: 10 parts of silver powder, 20 parts of cobalt powder, 30 parts of aluminum powder, and 20 parts of nickel powder.

[0096] The following are the thermal efficiency data of the magnetic non-stick ceramic cooking utensils of Examples 1-3, which were tested based on a 4L capacity IH rice cooker with a power of 1100W, as shown in Table 1:

[0097] Comparative Example 1

[0098] The bottom of the ceramic pot is covered with a magnetic film and a glaze layer. The thermal efficiency data of the 4L IH rice cooker with a power of 1100W is shown in Table 2:

[0099] Comparative Example 2

[0100] The bottom of the ceramic pot is coated with a magnetic film and covered with a glaze layer. The thermal efficiency data is tested based on a 4L capacity IH rice cooker with a power of 1100W, as shown in Table 3:

[0101] According to the data in Tables 1-3, compared with the rice cooker with a magnetic film in Comparative Examples 1-2, the magnetic non-stick ceramic cooking utensils in Examples 1-3 can greatly improve thermal efficiency and reduce power consumption.

[0102] In addition, it should be noted that the names of the various parts of the specific embodiments described in this specification may be different. Any equivalent or simple changes made based on the structure, features, and principles described in the patent concept of the present invention are included in the scope of protection of the patent of this invention. Those skilled in the art of the technical field to which the present invention relates may make various modifications, supplements, or replace the specific embodiments described in the description with similar methods. As long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they shall fall within the scope of protection of the present invention.

Claims

1. A production process for magnetic non-stick ceramic cooking utensils, characterized in that The steps include: 1) forming a ceramic green body by slip injection molding or roll forming of a ceramic material, and firing the ceramic green body at a high temperature to form a ceramic green body with an unglazed inner surface; 2) The inner surface of the ceramic blank is sandblasted to make the cleanliness level of the inner surface of the ceramic blank reach Sa2.5 level, and the inner surface roughness of the ceramic blank is between Ra2.5-Ra3.0; 3) Use an air gun to blow air to clean the inner surface of the ceramic blank; 4) preheating the cleaned ceramic blank at a temperature of 90°C-110°C; 5) coating the magnetic conductive material on the inner surface of the ceramic blank by hot-melt processing, and the magnetic conductive material at least covers the bottom of the inner surface of the ceramic blank to form a magnetic conductive layer on the inner surface of the ceramic blank; 6) Roughening the magnetic conductive layer to increase the adhesion of the surface of the magnetic conductive layer; 7) Preheating the entire ceramic blank with the magnetic conductive layer at a temperature of 45°C-55°C; 8) After preheating, spray an inner protective layer on the inner surface of the ceramic blank and the surface of the magnetic conductive layer, and spray an outer protective layer on the outer surface of the ceramic blank; 9) spraying a functional glaze layer on the inner surface of the inner protective layer; 10) The entire utensil is fired at a temperature of 250° C. to 350° C. for 15 min to 20 min to obtain the magnetic non-stick ceramic cooking utensil.

2. The production process of the magnetic non-stick ceramic cooking utensil according to claim 1, characterized in that: In the step 5), the magnetic conductive layer includes a surface layer and a bottom layer, the bottom layer is coated on the inner surface of the ceramic blank, and the surface layer is coated on the upper surface of the bottom layer.

3. The production process of the magnetic non-stick ceramic cooking utensil according to claim 2, characterized in that: In the step 5), the bottom layer is first coated on the inner surface of the ceramic blank, and after the bottom layer is cooled to a certain degree, the surface layer is coated on the upper surface of the bottom layer.

4. The production process of the magnetic non-stick ceramic cooking utensil according to claim 3, characterized in that: In the step 5), when the surface temperature of the bottom layer is annealed to 500° C.-600° C., the surface layer is coated on the upper surface of the bottom layer.

5. The production process of the magnetic non-stick ceramic cooking utensil according to claim 2, characterized in that: In the step 5), the magnetic conductive material is prepared by mixing the following raw materials in parts by weight: 10-20 parts of silver powder, 20-30 parts of aluminum powder, 10-15 parts of titanium powder, 15-20 parts of cobalt powder, and 10-20 parts of nickel powder.

6. The production process of the magnetic non-stick ceramic cooking utensil according to claim 5, characterized in that: The surface layer is made by mixing the following raw materials in parts by weight: 10-15 parts of titanium powder and 5-10 parts of silver powder; the bottom layer is made by mixing the following raw materials in parts by weight: 5-10 parts of silver powder, 15-20 parts of cobalt powder, 20-30 parts of aluminum powder and 10-20 parts of nickel powder.

7. The production process of the magnetic non-stick ceramic cooking utensil according to claim 1, characterized in that: In step 5), the magnetic conductive material covers at least the bottom of the inner surface of the ceramic blank to the part above the side wall thereof; In the step 5), the thickness of the magnetic conductive layer ranges from 0.05 mm to 1.00 mm.

8. The production process of the magnetic non-stick ceramic cooking utensil according to claim 1, characterized in that: In step 6), the roughening treatment comprises the following steps: 6-1) Use an air gun to blow clean the magnetic conductive layer for the first time; 6-2) The magnetic conductive layer is sandblasted to make the surface cleanliness level of the magnetic conductive layer reach Sa2.5 level and the surface roughness of the magnetic conductive layer be between Ra2.5-Ra3.0; 6-3) Use an air gun to blow clean the magnetic conductive layer for the second time.

9. The production process of the magnetic non-stick ceramic cooking utensil according to claim 1, characterized in that: In the step 8), both the inner protective layer and the outer protective layer are glaze layers; In the step 8), the thickness of the inner protective layer and the outer protective layer are both in the range of 40 μm to 50 μm.

10. The production process of the magnetic non-stick ceramic cooking utensil according to claim 1, characterized in that: In the step 9), the material of the functional glaze layer is SiO2; In the step 9), the thickness of the functional glaze layer is in the range of 20 μm to 30 μm.

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