Non-stick pan with aluminum oxide ceramic layer

Abstract

A non-stick pan with aluminum oxide ceramic layers comprises a metal pan body, the aluminum oxide ceramic layers are evenly distributed on the surface, making contact with food, of the metal pan body, and the thickness of the aluminum oxide ceramic layers ranges from 80 micrometers to 500 micrometers. Especially for 150-300 microns, the effect of reheating or direct plasma spraying of the aluminum oxide ceramic layer in a spraying mode is better, the sprayed aluminum oxide ceramic layer has a nano-micro structure, and ceramic powder spraying and plasma spraying with the particle size of 1-20 microns can be adopted; the aluminum oxide ceramic layer comprises nanopores, and the diameter size of the nanopores is 100-1500 nanometers; elliptical or polygonal concave holes are evenly distributed in the metal pot body.

Description

Technical Field

[0001] The invention relates to the preparation of a non-stick pan, and in particular to the application and preparation of a non-stick pan with an alumina ceramic layer and nano-microstructure concave pore distribution (especially polygonal concave pores) and an electric rice cooker and an electric baking pan. Background Art

[0002] Currently, non-stick pans generally refer to PTFE Teflon coated non-stick pans; since the maximum temperature resistance of PTFE Teflon coating cannot exceed 250°C and the health standards are getting higher and higher, the application of this type of pan is not very popular.

[0003] CN201710462896.9 Alumina ceramic pot body and preparation method thereof, ceramic inlaid metal inner pot and cooking utensil, wherein a microporous structure is formed on the inner surface of the alumina ceramic pot body, and the depth of the microporous structure is less than the thickness of the alumina ceramic pot body. The ceramic inlaid metal inner pot comprises a ceramic layer (1) as an inner layer, a metal layer (3) as an outer layer, and a heat conducting layer (2) located between the ceramic layer (1) and the metal layer (3), wherein a microporous structure is formed on the inner surface of the ceramic layer (1), and the depth of the microporous structure is less than the thickness of the alumina ceramic pot body. The alumina ceramic pot body described in the present invention can exhibit a good non-stick effect.

[0004] CN201410098602.5 discloses a ceramic inner pot for an electric rice cooker and a heat-resistant ceramic pot, wherein the ceramic inner pot for the electric rice cooker and the heat-resistant ceramic pot are mainly made of kaolin and graphite as raw materials and fired at 800°C to 1450°C, wherein the mass fraction of graphite is 5% to 80%.

[0005] CN201420649677.3 discloses a cooking pot, a ceramic inner pot and an electric rice cooker with the ceramic inner pot, wherein the cooking pot comprises: a body, the inner wall surface of the body is formed as a ceramic wall surface; a metal layer, the metal layer is arranged on the ceramic wall surface and covers at least a part of the ceramic wall surface, the thickness of the metal layer is 50μm-300μm; and a coating layer, the coating layer is arranged on the metal layer. The existing formed ceramic or Metsonite ceramic glaze layer has good physical properties, good hardness and toughness. However, no anti-sticking performance is noticed.

[0006] The alumina ceramic layer is a ceramic that is beneficial to human health. It has stable chemical properties, its hardness is comparable to that of corundum, it has better temperature resistance, and its melting point is much higher than that of the metal itself.

[0007] The applicant has applied for an electric baking pan, application number CN2023232150967, but it is better to use an alumina ceramic layer nano-microstructure polygonal hole non-stick pan for an electric baking pan. Summary of the invention

[0008] In order to solve the above problems, the purpose of the present invention is to provide an alumina ceramic layer, especially a non-stick pan with a nanostructured pore distribution (especially polygonal pores), especially a low-cost spray-coated ceramic non-stick pan and its application and preparation in an electric baking pan.

[0009] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an alumina ceramic layer non-stick pan, comprising a metal pan body, a uniformly distributed alumina ceramic layer is arranged on the surface of the metal pan body in contact with food, the thickness of the alumina ceramic layer is 80μm-500μm; especially 150μm-300μm, the effect of spraying and then heating or directly plasma spraying the alumina ceramic layer is better, the sprayed alumina ceramic layer has a nano-micro structure, and can be sprayed with ceramic powder with a particle size of 1-20μm, plasma spraying;

[0010] The alumina ceramic layer contains nanopores, and the diameter of the nanopores is 100-1500 nanometers;

[0011] The metal pot body is provided with uniformly distributed elliptical or polygonal concave holes, the maximum size of the elliptical or polygonal holes is 0.3-1.2 mm, the size of the protrusions between the elliptical or polygonal holes is 0.1-0.6 mm, and the uniformly distributed elliptical or polygonal concave holes are covered with an alumina ceramic layer.

[0012] The metal pot is provided with evenly distributed elliptical or polygonal concave holes; the elliptical or polygonal holes are in a parallel array or a staggered array; the surface material of the metal pot body can be stainless steel, aluminum, iron or even titanium; composite materials are also acceptable.

[0013] The concave holes are arranged in a parallel array or a staggered array; the hole depth is between 0.2 and 0.5 mm.

[0014] The pot is divided into several small areas, each of which is provided with an elliptical or polygonal hole.

[0015] The total area of ​​the elliptical or polygonal holes accounts for more than 50% of the entire area.

[0016] The direction of the small-area elliptical or polygonal hole is perpendicular to the direction of the adjacent elliptical or polygonal hole.

[0017] The stainless steel pot body can be compounded with an aluminum heat-conducting layer.

[0018] The longitudinal section of the elliptical or polygonal concave hole is wavy.

[0019] The spacing between polygonal holes is large, and the raised area of ​​the rib is smaller than the concave area, making it easier to process.

[0020] The maximum size of the highest protrusions between adjacent polygonal holes and the lowest concave arcs of the polygonal holes does not exceed 500 microns.

[0021] Beneficial effects: The present invention can deposit a large number of dispersed nanoparticles by covering the surface of metals such as stainless steel with a γ-Al2O3 honeycomb porous structure alumina ceramic layer through plasma spraying technology. This composite structure can adjust the color of the coating and enhance the vibration resistance and thermal shock resistance of the coating; the γ-Al2O3 honeycomb porous structure alumina ceramic layer is on the elliptical array hole or polygonal array hole and serves as the contact layer of the pot, which changes the contact structure of the metal pot surface and makes it have good anti-sticking performance, especially thin thickness and strong bonding. Compared with the smooth stainless steel surface: the hole array and the nanopores can make the contact between the dish and the pot body The contact area changes, and the holes contain oil and water, which reduces the heat directly transferred from the pot body to the dishes, and prevents the dishes from sticking due to excessive temperatures. The polygonal hole array is better than the circular hole (the applicant has applied for multiple circular concave holes). The area of ​​the concave hole will be larger than the circular hole. The oil and water in the pot can be constrained in the concave hole, and constrained by surface tension, to achieve an unexpectedly good non-stick effect of the alumina ceramic layer, and achieve the effect of existing fluorine-coated non-stick materials; the hole is a nano-pore superimposed micro-concave hole. At the same time, the preparation cost of this application is low (including the cost of materials is much lower than that of titanium). The inner surface of the metal pot body is pressed by a press machine through an alloy mold convex rib mold to form a stainless steel plate-shaped pot body. The inner surface of the stainless steel metal pot body does not need to be made of an anti-stick film layer or the like, and it is the original ecology of stainless steel. Even if it is fried at high temperature and the pot is burned empty, the alumina ceramic layer pressing the non-stick pan will not release any toxic substances or gases, will not pollute the food being cooked, and the kitchen environment, and cooking is safer.

[0022] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the densely arranged distribution of rectangular concave holes in the pot body according to an embodiment of the present invention.

[0024] Figure 2 It is a schematic diagram of the staggered arrangement of rectangular recessed holes in the pot body according to an embodiment of the present invention.

[0025] Figure 3 It is a schematic diagram of the distribution of hexagonal recessed holes in the pot body according to an embodiment of the present invention.

[0026] Figure 4 It is a schematic diagram of the distribution of triangular concave holes in the pot body according to an embodiment of the present invention.

[0027] Figure 5 It is a cross-sectional schematic diagram of a pot body according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings: embodiments of the present invention are described in detail, examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same objects.

[0029] Figure 1-Figure 4 The middle pot body can adopt a uniform heat layer (with a composite aluminum layer) or a metal pot body; the present embodiment relates to an alumina ceramic layer pressed non-stick pot, and the uniformly distributed polygonal holes 1 with the same depth are better, and the distribution of the polygonal holes can also be denser at the bottom of the pot than at the edge of the pot; there are protrusions 2 between adjacent polygonal holes.

[0030] Metal pot body 3, alumina ceramic layer 4. The metal pot body 3 is treated, such as cleaning surface treatment, frosting (coarse sand frosting for surface treatment to increase the roughness of the metal surface) or shot peening and then cleaning and then direct plasma spraying technology uses a rigid non-transferred plasma arc as a heat source to heat the alumina powder material to a molten or semi-molten state, and atomizes it through a high-speed flame flow and accelerates it to the pre-treated workpiece surface to form a firm γ-Al2O3 honeycomb porous structure spray coating.

[0031] Plasma spraying technology uses a rigid non-transferred plasma arc as a heat source to heat the alumina powder material to a molten or semi-molten state, and atomizes it through a high-speed flame flow and accelerates it to spray onto the pre-treated workpiece surface to form a firm spray coating. The alumina coating has a high conductivity and excellent dielectric insulation properties. It can maintain electrical insulation at high temperatures. It can form a γ-Al2O3 honeycomb porous structure through trace amounts of CeO2 ZrO2, SiO2, TiO2, Fe2O3 and other components, and can accumulate a large number of dispersed nanoparticles. This composite structure can adjust the color of the coating and enhance the vibration resistance and thermal shock resistance of the coating. This technology is currently only used for metal catalyst coatings.

[0032] The non-stick pan with nanostructured polygonal holes of alumina ceramic layer includes a metal pan body, and the surface of the metal pan body in contact with food is provided with uniformly distributed polygonal holes; including an outer stainless steel layer, and the surface of the stainless steel layer is provided with polygonal holes in a parallel array or a radiating (radial) array, especially the pan is divided into several small areas, and each small area polygonal hole is a parallel line array polygonal hole. The area of ​​each small area can be 20-100 square centimeters; if there is no small area, it can also be a concentric circle structure polygonal hole, or a radiating (radial) polygonal hole.

[0033] The longitudinal section of the polygonal hole is wavy; the maximum size of the elliptical or polygonal hole can be 0.3-1.2mm, the polygonal hole spacing (rib width between polygonal holes) is 0.1-0.6mm, 0.3-0.5mm is better; the polygonal hole depth is 0.2-0.5mm, especially 0.3-0.4mm.

[0034] The spacing between polygonal holes is large, and the raised area of ​​the rib is smaller than the concave area, making it easier to process.

[0035] In a further solution, the rib width of the polygonal hole can be 300, 400, or 500 microns. The polygonal hole is pressed by a mold made of hard alloy through a pressure device, and the polygonal hole and the pot body are both hardened layer structures; a mold with uniformly distributed convex ribs is made of hard alloy, and pressed on the pot body plate to form a uniform polygonal hole distribution on the pot body.

[0036] The total area of ​​the polygonal holes accounts for a large proportion of the entire area, generally greater than 50%, which can ensure the physical non-stick performance of the entire non-stick pan and the service life of the pan.

[0037] Use 304 stainless steel as the surface of the pot body, which is the contact surface with the food, steel-aluminum composite or steel-aluminum-steel composite (referred to as three-layer steel, of course the purpose is to reduce weight and conduct temperature more evenly). 316 stainless steel is better.

[0038] Furthermore, the upper convex arc of the wave shape (the raised ribs between adjacent polygonal holes, namely the polygonal frame) is narrower than the lower concave arc (the polygonal hole itself); that is, the area of ​​the polygonal frame is smaller than the area of ​​the polygonal concave hole.

[0039] One of the cores of this application is that the area (raised part) that holds up the food accounts for only 30-50% of the total area of ​​the pot body (bottom); especially 30-45%; it has good anti-stick performance, and can be further processed by sanding, polishing, etc. to reduce the roughness of the inner surface of the pot body, reduce the friction between the food and the inner surface of the pot body, make the flipping of the shovel smoother when frying dishes, and the non-stick effect basically reaches the level of the new PTFE Teflon coating application. In particular, the manufacturing cost is low, which is half the manufacturing cost of other functional non-stick pans.

[0040] The pot body is in a concave pot shape, which is formed by pressing a flat plate with a hydraulic press. The pot body will be connected to a pot handle. The back of the stainless steel is composited with an aluminum layer. When a composite pot body is used, the thickness of the stainless steel is about 0.5-1mm, and the aluminum layer is about 1.5mm; stainless steel or titanium and aluminum plates can be composited by pressing or explosion.

[0041] Preparation of polygonal holes: An alloy mold with uniform polygonal hole protrusions is used, and the stainless steel pot surface is pressed by the mold and a press to form polygonal holes. The polygonal hole mold can also be prepared by electrochemical methods.

[0042] Polygonal hole arrays such as triangles, rectangles, squares, pentagons, hexagons, and octagons and nanopores can be prepared by plate etching methods or mold imprinting methods. The nanopores are especially made by pressing abrasives (dry materials or slurries) with a size of 30-300nm (500nm is also possible) nanometer-scale, and the pot surface is better nitrided.

[0043] The present invention can be used not only for various cooking pots, but also for electric baking pans and electric rice cookers.

[0044] Application of electric baking pan: The electric baking pan with a non-stick layer of polygonal holes in nanostructure of alumina ceramic layer comprises upper and lower heating plates, pot bodies and surfaces, and a heating component, wherein the heating component is arranged inside the pot body and surfaces of the upper and lower heating plates, and the upper and lower heating plates are respectively installed on the upper cover and the base; the structure of the pot body and surface is that the lower surface of the upper heating plate and the upper surface of the lower heating plate have evenly distributed protrusions, and the upper and lower heating plates are made of stainless steel or a composite metal material with aluminum as the pot surfaces of the upper and lower heating plates. The portion of the pot surface that contacts the food is the non-stick pan (layer) of polygonal holes in nanostructure of alumina ceramic layer.

[0045] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. An alumina ceramic layer non-stick pan, comprising a metal pan body, characterized in that: A uniformly distributed alumina ceramic layer is arranged on the surface of the metal pot body that contacts food, and the thickness of the alumina ceramic layer is 80 μm-500 μm.

2. The alumina ceramic layer non-stick pan according to claim 1, characterized in that: The thickness of the alumina ceramic layer is 150 μm-300 μm.

3. The alumina ceramic layer non-stick pan according to claim 1, characterized in that: The metal pot body is provided with uniformly distributed elliptical or polygonal concave holes, the maximum size of the elliptical or polygonal holes is 0.3-1.2 mm, the size of the protrusions between the elliptical or polygonal holes is 0.1-0.6 mm, and the uniformly distributed elliptical or polygonal concave holes are covered with an alumina ceramic layer.

4. The alumina ceramic layer nano-microstructure concave hole non-stick pan according to claim 3 is characterized in that: The concave holes are arranged in a parallel array or a staggered array; the hole depth is between 0.2 and 0.5 mm.

5. The alumina ceramic layer nano-microstructure concave hole non-stick pan according to claim 1 is characterized in that: The pot is divided into several small areas, each of which is provided with an elliptical or polygonal hole.

6. The alumina ceramic layer nano-microstructure concave hole non-stick pan according to claim 2 is characterized in that: The total area of ​​the elliptical or polygonal holes accounts for more than 50% of the entire area.

7. The alumina ceramic layer nano-microstructure concave hole non-stick pan according to claim 2 or 3, characterized in that: The direction of the small-area ellipse or polygonal hole is perpendicular to the direction of the adjacent polygonal hole.

8. The alumina ceramic layer nano-microstructure concave hole non-stick pan according to claim 2 or 3, characterized in that: The pot body is made of stainless steel and has a composite aluminum heat-conducting layer.

9. The alumina ceramic layer nano-microstructure concave hole non-stick pan according to claim 2, characterized in that: The longitudinal section of the elliptical or polygonal concave hole is wavy.

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