Cookware and cooking appliance

Abstract

The utility model relates to the technical field of cooking utensils, and discloses a cooking utensil and a cooking appliance. The utility model designs a kind of iron-based material as cooking utensil base body and carries out nitrogen-oxygen co-permeation treatment to the whole cooking utensil, forms nitrogen-oxygen co-permeation layer, which can be used as the transition layer of thermal expansion coefficient, elastic modulus, hardness and other physical parameters, thereby effectively buffering and dispersing interface stress, avoiding the interface failure problem generated when the two materials with different properties are directly combined, making the cooking utensil more reliable and durable;Nitrogen-oxygen co-permeation layer also has very strong corrosion resistance, and corrosion products are not easy to grow and accumulate at the interface between non-stick layer and nitrogen-oxygen co-permeation layer, improving the overall rust-proof ability of the cooking utensil. The cooking utensil of the utility model can be used under full-power working condition of induction cooker, has good rust-proof performance and low preparation cost.

Description

Technical Field

[0001] This utility model relates to the field of cooking cookware technology, and in particular to a cookware and cooking utensils. Background Technology

[0002] There are many types of cookware on the market, and the main difference lies in the material. Cookware made of materials such as aluminum alloy and stainless steel has been widely used due to its mature technology and ease of processing. However, stainless steel is more expensive. Aluminum-based cookware cannot be directly heated on an induction cooker. If it is necessary to use it, a double bottom plate must be added. Because there are many riveting holes when the double bottom plate is combined with the aluminum base material, the riveting holes reduce the magnetic conductive area of ​​the double bottom plate, which results in a lower power when the induction cooker uses this type of cookware. Utility Model Content

[0003] The main purpose of this invention is to develop a cookware with iron as the base material that can be used under the full power conditions of an induction cooker, has good rust resistance, and has a low manufacturing cost.

[0004] This utility model proposes a cookware, comprising: a cookware base; a non-stick layer disposed on the inner wall surface of the cookware base; a first nitrogen-oxygen co-permeation layer disposed between the cookware base and the non-stick layer; and a second nitrogen-oxygen co-permeation layer disposed on the outer wall surface of the cookware base.

[0005] In one embodiment, the non-stick layer is selected from any one of polytetrafluoroethylene coating, polyetheretherketone coating, silicone resin coating, and ceramic coating.

[0006] In one embodiment, the porosity of the first nitrogen-oxygen co-permeation layer is 1% to 3%; and / or, the porosity of the second nitrogen-oxygen co-permeation layer is 1% to 3%.

[0007] In one embodiment, the mass fraction of oxygen in the first nitrogen-oxygen co-permeation layer is 1wt% to 3wt%; and / or, the mass fraction of nitrogen in the first nitrogen-oxygen co-permeation layer is 5wt% to 10wt%.

[0008] In another embodiment, the oxygen element in the second nitrogen-oxygen co-permeation layer has a mass fraction of 1wt% to 3wt%; and / or, the nitrogen element in the second nitrogen-oxygen co-permeation layer has a mass fraction of 5wt% to 10wt%.

[0009] In one embodiment, the cookware substrate is selected from any one of cast iron substrate, low carbon steel substrate, stainless steel substrate, or pure iron substrate.

[0010] In one embodiment, the surface roughness of the cookware substrate is 2μm to 15μm.

[0011] In one embodiment, the inner wall surface of the cookware base is provided with at least one concave-convex structure, the concave-convex structure including a convex part and / or a concave part; wherein, the height of the convex part is 0.05mm~0.15mm; and / or, the depth of the concave part is 0.05mm~0.15mm.

[0012] In one embodiment, the distance between adjacent protrusions on the inner wall surface of the cookware base is 0.2mm to 2mm; and / or, the distance between adjacent recesses on the inner wall surface of the cookware base is 0.2mm to 2mm; and / or, the distance between adjacent protrusions and recesses on the inner wall surface of the cookware base is 0.2mm to 2mm.

[0013] In one embodiment, the thickness of the cookware base is 4mm to 6mm.

[0014] In one embodiment, the thickness of the non-stick layer is 0.3 mm to 1 mm.

[0015] In one embodiment, the thickness of the first nitrogen-oxygen co-diffusion layer is 0.2 mm to 0.6 mm.

[0016] In one embodiment, the thickness of the second nitrogen-oxygen co-diffusion layer is 0.2 mm to 0.6 mm.

[0017] In one embodiment, the cookware further includes a protective layer disposed on the surface of the second nitrogen-oxygen co-permeation layer on the side away from the cookware substrate.

[0018] In one embodiment, the protective layer is a ceramic coating.

[0019] In one embodiment, the thickness of the protective layer is 0.5 mm to 1 mm.

[0020] This utility model also proposes a cooking utensil, including the pot.

[0021] This invention designs a cookware with an iron-based material as the substrate and subjects the entire cookware to a nitrogen-oxygen co-diffusion treatment. This nitrogen-oxygen co-diffusion layer acts as a transition layer for physical parameters such as thermal expansion coefficient, elastic modulus, and hardness, effectively buffering and dispersing interfacial stress. This avoids interfacial failure problems that occur when two materials with vastly different properties are directly bonded, making the cookware more reliable and durable. The nitrogen-oxygen co-diffusion layer itself has high hardness and high wear resistance, and is not easily deformed under impact, thus providing a better adhesion surface for the ceramic coating on the inner surface of the cookware. This effectively reduces the risk of cracking of the non-stick layer due to external impacts. Furthermore, the nitrogen-oxygen co-diffusion layer has extremely strong corrosion resistance; corrosion products are unlikely to grow and accumulate at the interface between the non-stick layer and the nitrogen-oxygen co-diffusion layer, effectively preventing blistering, peeling, and cracking of the non-stick layer, and also improving the overall rust resistance of the cookware. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the cookware in one embodiment of the present invention; Figure 2 This is a partial enlarged view of part A of the pot in one embodiment of the present invention; Figure 3 This is a partial enlarged view of part A of the cookware in another embodiment of the present invention; Figure 4 This is a partial enlarged view of the cookware A in another embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures: 10. Cookware base; 101. Protrusion; 21. First nitrogen-oxygen co-permeation layer; 22. Second nitrogen-oxygen co-permeation layer; 30. Non-stick layer; 40. Protective layer.

[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0027] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0029] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0030] The technical problem solved by this utility model is that there are many types of cookware on the market, and the differences are mainly reflected in the materials. Cookware made of materials such as aluminum alloy and stainless steel has been widely used due to its mature technology and ease of processing. However, stainless steel is expensive. Aluminum substrate cannot be directly heated on an induction cooker. If it is necessary to use it, a double bottom plate needs to be added. Since there are many riveting holes when the double bottom plate is combined with the aluminum substrate, the riveting holes reduce the magnetic conductive area of ​​the double bottom plate, resulting in a lower power when the induction cooker uses this type of cookware.

[0031] It should be noted that the relevant technologies use cast iron as the base material, and then coat it with a non-stick coating. However, the casting process of cast iron is complex, and cast iron has poor plasticity, toughness, and ductility, making the cookware prone to cracking and failure if subjected to impact during use. Another related technology uses thermal spraying, electroplating, and other techniques to prepare an iron coating on an aluminum-based cookware body. The coating formed by this method is relatively thin, the magnetic conductivity of the cookware is weak, and the sprayed iron-based coating requires an additional anti-corrosion layer, otherwise the coating will corrode and fail, thus further increasing the manufacturing process and cost.

[0032] It should also be noted that when iron-based materials are used as the base material for cookware in related technologies, a non-stick layer is usually coated on the inner surface of the cookware base. This non-stick layer is typically a ceramic coating, which offers better wear resistance compared to organic polymer non-stick coatings. However, iron-based cookware has lower hardness and is prone to deformation upon impact, which can cause the attached ceramic coating to crack. Furthermore, due to the significant difference in thermal expansion coefficients, the ceramic coating can easily detach from the cookware base after prolonged use.

[0033] To solve the above problems, this utility model proposes a cookware, referring to... Figure 1 and Figure 2It includes: a cookware base 10; a non-stick layer 30 disposed on the inner wall surface of the cookware base 10; a first nitrogen-oxygen co-permeation layer 21 disposed between the cookware base 10 and the non-stick layer 30; and a second nitrogen-oxygen co-permeation layer 22 disposed on the outer wall surface of the cookware base 10.

[0034] It should be noted that the cookware in this invention uses an iron-based material as the cookware base and undergoes a nitrogen-oxygen co-diffusion treatment. The resulting first and second nitrogen-oxygen co-diffusion layers serve as transition layers for physical parameters such as thermal expansion coefficient, elastic modulus, and hardness, effectively buffering and dispersing interfacial stress. This avoids interfacial failure problems that occur when two materials with vastly different properties are directly bonded, making the cookware more reliable and durable. The nitrogen-oxygen co-diffusion layer itself has high hardness and high wear resistance, and is not easily deformed under impact, thus providing a better adhesion surface for the ceramic coating on the inner surface of the cookware. This effectively reduces the risk of cracking of the non-stick layer caused by external impacts. In addition, the nitrogen-oxygen co-diffusion layer also has extremely strong corrosion resistance. Corrosion products are not easily grown and accumulated at the interface between the non-stick layer and the nitrogen-oxygen co-diffusion layer, thus effectively preventing bubbles, peeling, and cracking of the non-stick layer, and also improving the overall rust resistance of the cookware.

[0035] It should also be noted that iron-based cookware substrates are typically made from cold-rolled steel sheets, and even after surface sandblasting, the surface roughness remains relatively low, failing to provide a sufficient number of mechanical bonding points for the long-term stable bonding of the ceramic coating. However, after a nitrile-oxygen co-diffusion layer is formed on the surface of the iron-based cookware, the compound structure of this layer exhibits high mechanical strength and a porous structure, providing both a sufficient number of mechanical bonding points and ensuring the high strength of these points. When liquid ceramic coating is applied to the surface of the nitrile-oxygen co-diffusion layer, it penetrates into the pores of the nitrile-oxygen co-diffusion layer, allowing the cured ceramic coating to firmly adhere to the cookware substrate.

[0036] In a specific embodiment, the first nitrogen-oxygen co-diffusion layer 21 and the second nitrogen-oxygen co-diffusion layer 22 can be prepared using a gas nitrogen-oxygen co-diffusion process, including the following steps: the cookware substrate 10 is sequentially cleaned, degreased, and sandblasted, then placed in a sealed furnace, a vacuum is drawn or an inert gas is introduced to expel air, the temperature is raised, and then a precisely proportioned process gas, including a nitrogen source and an oxygen source, is introduced. The nitrogen source is typically ammonia, which decomposes on the workpiece surface to provide active nitrogen atoms; the oxygen source is typically air, carbon dioxide, or nitrous oxide, which decomposes to provide active oxygen atoms. The gas flow rate, ratio, and furnace pressure are controlled, and the temperature is maintained for a certain time to allow nitrogen and oxygen to permeate simultaneously. After the co-diffusion stage, water vapor or an air-rich gas is directly introduced into the furnace to generate a dense oxide film in situ on the workpiece surface. Finally, the workpiece is cooled to room temperature and removed from the furnace.

[0037] In another embodiment, the first nitrogen-oxygen co-diffusion layer 21 and the second nitrogen-oxygen co-diffusion layer 22 can be prepared by a salt bath nitrogen-oxygen co-diffusion process or a plasma nitrogen-oxygen co-diffusion process.

[0038] In one embodiment, the non-stick layer 30 is selected from any one of polytetrafluoroethylene coating, polyetheretherketone coating, silicone resin coating, and ceramic coating.

[0039] It's important to note that the non-stick coating on the inner wall of a cookware, as the functional surface that directly contacts food, determines the cookware's initial non-stick performance and applicable scenarios based on its material selection. Polytetrafluoroethylene (PTFE) coatings offer superior general non-stick properties due to their extremely low surface energy; polyetheretherketone (PEEK) coatings maintain good non-stick properties while possessing higher hardness, wear resistance, and high-temperature resistance, resulting in a longer lifespan; silicone resin coatings excel in their excellent flexibility and resistance to thermal shock; and ceramic coatings primarily attract consumers with their absolute safety as inorganic materials and high-temperature resistance. All of these factors contribute to the non-stick properties of cookware, expanding its applicability and enhancing product quality.

[0040] In a preferred embodiment, the non-stick layer 30 is a ceramic coating.

[0041] Understandably, ceramic coatings are far safer than organic polymer coatings. Because they contain no PTFE (polytetrafluoroethylene) or PFOA (perfluorooctanoic acid) or other organic fluorine compounds, they do not decompose and release harmful substances even at extremely high temperatures (typically above 450°C), fundamentally eliminating users' concerns about chemical toxicity. Furthermore, the surface hardness of ceramics typically reaches 6H or higher, significantly resisting scratches from metal spatulas and greatly delaying coating wear and failure, thus extending the lifespan of the cookware. In addition, the porous structure of ceramics allows it to be firmly anchored to the underlying nitrogen-oxygen co-diffusion layer through physical adsorption, resulting in high interfacial bonding strength.

[0042] In one embodiment, the porosity of the first nitrogen-oxygen co-permeation layer 21 is 1% to 3%; and / or, the porosity of the second nitrogen-oxygen co-permeation layer 22 is 1% to 3%.

[0043] It should be noted that due to the differences in the crystal structure of compounds such as iron nitride and iron oxide in the first and second oxynitride co-diffusion layers, as well as factors such as gas evolution and internal stress during the process, microscopic pores and channels inevitably form in the diffusing layers. These provide physical space for the subsequent ceramic coating to wet and embed during application. When the ceramic slurry or ceramic sol precursor penetrates these nanoscale pores and solidifies, a strong mechanical interlocking effect is formed, greatly enhancing the adhesion between the ceramic coating and the oxynitride co-diffusion layer. By controlling precise process parameters to limit the porosity of the first and second oxynitride co-diffusion layers to a specific range, the risk of the non-stick coating on the inner surface of the cookware peeling off under thermal cycling or mechanical scratching can be effectively reduced.

[0044] In one embodiment, the mass fraction of oxygen in the first nitrogen-oxygen co-permeation layer 21 is 1wt% to 3wt%; and / or, the mass fraction of nitrogen in the first nitrogen-oxygen co-permeation layer 21 is 5wt% to 10wt%.

[0045] In another embodiment, the oxygen element in the second nitrogen-oxygen co-permeation layer 22 is 1wt% to 3wt% by mass; and / or, the nitrogen element in the second nitrogen-oxygen co-permeation layer 22 is 5wt% to 10wt% by mass.

[0046] It should be noted that in the first or second oxynitride co-diffusion layer, the nitrides formed mainly include ε-iron nitride and γ-iron nitride. Nitrogen, as the primary alloying element, directly dominates the mechanical properties of the diffusion layer due to its mass fraction. Sufficient nitrogen content ensures the continuous and dense formation of the ε-phase, providing a hard and stable "support skeleton" for the overlying ceramic coating. This layer is porous and uniformly distributed; these micropores provide countless tiny "anchor points" for the subsequent ceramic coating, facilitating its mechanical integration. Appropriate amounts of oxygen activate the surface during nitriding, promoting nitrogen penetration and generating extremely fine oxide dispersions or a thin layer of magnetite on the surface and grain boundaries of the ε-phase. This further fills and refines the microstructure of the iron nitride diffusion layer, reducing its porosity and enhancing its corrosion resistance. In addition, this oxide layer is rich in active groups such as hydroxyl groups. Active groups such as silanol groups in ceramic coatings can easily undergo dehydration condensation reactions with hydroxyl groups on the substrate surface to form strong chemical covalent bonds. The binding force of these chemical bonds is much stronger than that of simple physical adsorption.

[0047] In one embodiment, the cookware substrate 10 is selected from any one of cast iron substrate, low carbon steel substrate, stainless steel substrate, and pure iron substrate.

[0048] In a preferred embodiment, the cookware substrate 10 is selected from a pure iron substrate.

[0049] Understandably, compared to other iron-based materials, pure iron provides a substrate with a pure composition, uniform structure, and ideal reactivity. Because pure iron contains almost no carbon or other alloying elements such as Cr, Ni, and Mo, during oxynitride infiltration, active nitrogen atoms can dissolve unimpeded in the iron phase and react directly, uniformly forming a compound layer dominated by iron nitride. Furthermore, pure iron has better ductility, making it a better stress buffer as a substrate material for pots. Based on these factors and cost considerations, pure iron is undoubtedly the better choice.

[0050] In one embodiment, the surface roughness of the cookware substrate 10 is 2 μm to 15 μm.

[0051] It should be noted that cookware substrates typically require sandblasting before nitriding and oxygenation. This process creates a uniformly distributed microscopic peak-valley structure on the substrate surface, providing numerous tiny anchor points for coating adhesion. If the surface roughness of the cookware substrate is too high, it can lead to stress concentration, making it prone to cracking upon impact. Furthermore, it hinders the coating's penetration into crevices, creating weak points that become sources of corrosion.

[0052] In one embodiment, the inner wall surface of the cookware base 10 is provided with at least one uneven structure, the uneven structure including a protrusion and / or a recess; the height of the protrusion is 0.05mm to 0.15mm; and / or, the depth of the recess is 0.05mm to 0.15mm. Specifically, in this embodiment, a protrusion refers to a raised portion on the inner surface of the cookware base that is higher than its average thickness, while a recess refers to a pit on the inner surface of the cookware base that is lower than its average thickness. It is understood that the height of the protrusion or the depth of the recess can be any one of 0.05mm, 0.05mm, 0.06mm, 0.1mm, 0.11mm, 0.12mm, or 0.15mm, and any value within the above range is acceptable.

[0053] In one specific embodiment, refer to Figure 3 The inner wall surface of the cookware base 10 is provided with multiple protrusions 101.

[0054] Understandably, the design of the concave-convex structure on the inner wall of the cookware substrate creates a three-dimensional interlocking interface between the cookware substrate and the first nitrogen-oxygen co-permeation layer and the non-stick layer, effectively resisting shear stress caused by thermal cycling or mechanical scratching and preventing the coating from peeling off. On the other hand, it increases the surface area of ​​the inner wall and optimizes the heat conduction process.

[0055] In one specific embodiment, the distance between adjacent protrusions on the inner wall surface of the cookware base is 0.2mm to 2mm; and / or, the distance between adjacent recesses on the inner wall surface of the cookware base is 0.2mm to 2mm; and / or, the distance between adjacent protrusions and recesses on the inner wall surface of the cookware base is 0.2mm to 2mm. It is understood that the distance between adjacent protrusions and / or the distance between adjacent recesses and / or the distance between adjacent recesses and protrusions can specifically be any of 0.2mm, 0.3mm, 0.4mm, 0.5mm, 1mm, 1.5mm, or 2mm, and any distance falling within the above range is acceptable.

[0056] It is understandable that by controlling the spacing between adjacent concave and convex structures, the distribution density of the concave and convex structures on the inner wall of the cookware substrate can be controlled, thereby strengthening the adhesion between the layered structures and allowing the stress to be evenly distributed.

[0057] In one embodiment, the thickness of the cookware base 10 is 4mm to 6mm. It is understood that the thickness of the cookware base can be any of 4mm, 4.1mm, 4.2mm, 4.5mm, 5mm, 5.1mm, and 6mm, and any thickness within the above range is acceptable.

[0058] In one embodiment, the thickness of the non-stick layer 30 is 0.3 mm to 1 mm. It is understood that the thickness of the non-stick layer 30 is 0.3 mm to 1 mm. It is also understood that the thickness of the non-stick layer can be any of 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, or 1 mm, and any thickness within the above range is acceptable.

[0059] In one embodiment, the thickness of the first nitrogen-oxygen co-diffusion layer 21 is 0.2 mm to 0.6 mm. It is understood that the thickness of the first nitrogen-oxygen co-diffusion layer can be any of 0.2 mm, 0.21 mm, 0.3 mm, 0.4 mm, or 0.6 mm, and any thickness within the above range is acceptable.

[0060] In one embodiment, the thickness of the second oxynitride co-diffusion layer 22 is 0.2 mm to 0.6 mm. It is understood that the thickness of the second oxynitride co-diffusion layer can be any of 0.2 mm, 0.21 mm, 0.3 mm, 0.4 mm, or 0.6 mm, and any thickness within the above range is acceptable.

[0061] In one embodiment, reference is made to Figure 4 The cookware also includes a protective layer 40, which is disposed on the surface of the second nitrogen-oxygen co-permeation layer 22 on the side away from the cookware substrate 10.

[0062] It should be noted that while the outermost second nitride-oxygen co-permeation layer of the cookware possesses excellent corrosion resistance and a certain degree of hardness, its surface may still contain extremely fine pores or uneven composition. Furthermore, under extreme conditions such as prolonged exposure to open flame, accidental impacts from a spatula, or scrubbing with hard objects, the thin film of magnetite on its surface may still be damaged, easily leading to oxidation and corrosion of the cookware substrate. The addition of a protective layer greatly enhances the ability to isolate the cookware from external corrosive media, effectively resisting continuous oxidation at high temperatures or mechanical scratches during daily use. Therefore, the addition of a protective layer significantly improves the durability and aesthetics of the cookware.

[0063] In one embodiment, the protective layer 40 includes a ceramic coating.

[0064] Understandably, the ceramic coating used as a protective layer is usually prepared as an inorganic silicate coating through sol-gel technology. After curing, it forms a continuous, non-porous glassy amorphous structure, which can physically cover and seal the inherent micropores and grain boundaries on the surface of the underlying second nitrogen-oxygen co-diffusion layer, completely blocking external water vapor, oxygen, and corrosive ions. Secondly, the high hardness of the ceramic layer provides excellent mechanical scratch protection for the relatively soft second nitrogen-oxygen co-diffusion layer, effectively resisting wear caused by friction with the stove and collisions caused by stacking cookware. Finally, ceramics have excellent thermal stability and chemical inertness, and can withstand prolonged exposure to open flame without decomposition, discoloration, or loss of gloss, thus giving the cookware an excellent easy-to-clean surface and a long-lasting beautiful appearance.

[0065] In one embodiment, the thickness of the protective layer is 0.5 mm to 1 mm. It is understood that the thickness of the protective layer can be any of 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, or 1 mm, and any thickness within the above range is acceptable; furthermore, the protective layer can be one or more layers of coating, as long as the total thickness meets the above range.

[0066] This utility model also proposes a cooking utensil, including the aforementioned pot. Specifically, the pot can be an inner pot of a rice cooker, an inner pot of an electric pressure cooker, or a frying pan, a milk pot, etc. The cooking utensil provided by this utility model has all the beneficial effects of the pot, which will not be elaborated here.

[0067] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A cookware, characterized in that, The cookware includes: Cookware base; A non-stick layer is provided on the inner wall surface of the cookware substrate; A first nitrogen-oxygen co-permeation layer is disposed between the cookware substrate and the non-stick layer; and The second nitrogen-oxygen co-permeation layer is disposed on the outer wall surface of the cookware substrate.

2. The cookware as described in claim 1, characterized in that, The non-stick layer is selected from any one of polytetrafluoroethylene coating, polyetheretherketone coating, silicone resin coating, and ceramic coating.

3. The cookware as described in claim 1, characterized in that, The cookware substrate is selected from any one of cast iron substrate, low carbon steel substrate, stainless steel substrate, or pure iron substrate.

4. The cookware as described in claim 1, characterized in that, The surface roughness of the cookware substrate is 2μm~15μm.

5. The cookware as described in claim 1, characterized in that, The inner wall surface of the cookware base is provided with at least one concave-convex structure, the concave-convex structure including a convex part and / or a concave part; Wherein, the height of the protrusion is 0.05mm to 0.15mm; and / or, the depth of the recess is 0.05mm to 0.15mm.

6. The cookware as described in claim 5, characterized in that, The distance between adjacent protrusions on the inner wall surface of the cookware base is 0.2mm to 2mm; and / or, the distance between adjacent recesses on the inner wall surface of the cookware base is 0.2mm to 2mm; and / or, the distance between adjacent protrusions and recesses on the inner wall surface of the cookware base is 0.2mm to 2mm.

7. The cookware as described in claim 1, characterized in that, The thickness of the cookware base is 4mm~6mm; And / or, the thickness of the non-stick layer is 0.3mm to 1mm; And / or, the thickness of the first nitrogen-oxygen co-diffusion layer is 0.2 mm to 0.6 mm; And / or, the thickness of the second nitrogen-oxygen co-diffusion layer is 0.2 mm to 0.6 mm.

8. The cookware as described in claim 1, characterized in that, The cookware also includes a protective layer disposed on the surface of the second nitrogen-oxygen co-permeation layer away from the cookware substrate.

9. The cookware as described in claim 8, characterized in that, The protective layer is a ceramic coating; And / or, the thickness of the protective layer is 0.5mm to 1mm.

10. A cooking utensil, characterized in that, The cooking appliance includes the pot as described in any one of claims 1 to 9.

Images