Cookware that achieves non-stick effect by pure inorganic structure layer and its manufacturing method

Abstract

The present invention relates to a cooking utensil that realizes an anti-stick effect by a pure inorganic structural layer and a manufacturing method thereof. The cooking utensil includes a base layer and a pure inorganic structural layer, and the pure inorganic structural layer is formed by spraying inorganic particles on the inner surface of the base layer, and a void structure is formed between the inorganic particles of the pure inorganic structural layer, and the pure inorganic structural layer includes at least three sub-inorganic structural layers, and the at least three sub-inorganic structural layers are stacked on the inner surface of the base layer in order according to the particle size of the inorganic particles, in which the particle size of the inorganic particles of the sub-inorganic structural layer adjacent to the base layer is the largest, and the particle size of the inorganic particles of the sub-inorganic structural layers becomes smaller in the direction away from the base layer, so that the voids in the sub-inorganic structural layers become smaller in the direction away from the base layer. The pure inorganic structural layer of the cookware of the present invention has high bonding strength and toughness, high surface hardness, is not easily scratched, is wear-resistant, and has the functions of absorbing oil on the surface, storing oil and self-lubricating. After heating, the voids can perform heating breathing of the pores, thereby achieving the effects of anti-sticking and easy cleaning.

Description

[Technical Field]

[0001] The present invention relates to the technical field of kitchenware, and more particularly to a cookware having a non-stick layer and a method for manufacturing the same. [Background technology]

[0002] Non-stick cookware, especially non-stick pans, is the mainstream cookware currently available on the market, and is achieved mainly by forming a layer of non-stick material on the surface of the pan base.

[0003] In conventional technology, the main component of common non-stick materials is a fluorine-based organic compound such as polytetrafluoroethylene, and the non-wetting properties of the fluorine-based organic compound can be used to provide non-stick properties to cookware. However, fluorine-based organic compounds decompose under high temperature conditions (for example, polytetrafluoroethylene at temperatures exceeding 250°C), damaging the fluorine-based organic compound coating and causing the cookware to lose its non-stick properties. Furthermore, the decomposition of the fluorine-based organic compound coating can generate toxic substances that may be harmful to human health.

[0004] Another non-stick material is mainly composed of silica sol resin, which, like fluorine-based organic compound materials, has excellent non-stick properties. However, due to the characteristics of the material itself, it has severe limitations in terms of heat resistance, hardness, durability, and environmental safety, and is unable to fully meet the demands of the market and consumers.

[0005] It has also been proposed to use ceramic and enamel as non-stick materials to manufacture non-stick cookware. While ceramic and enamel have properties such as good appearance, ultra-heat resistance, high hardness, durability, and environmental protection, the materials themselves do not have any non-stick properties and have low non-stick properties, whether oiled or not. Therefore, they are generally used in products such as soup pots and stew pots, and have not been widely adopted.

[0006] Currently, non-stick structures have begun to appear on the market in which numerous fine grooves or capillary pores are formed on the inner surface of cookware, which reduce the contact area between the food ingredients and the inner surface of the cookware during cooking and allow the grooves and pores on the inner surface of the cookware to adsorb oil and fat. During cooking, the oil in the grooves and pores expands and is released from the grooves and pores, forming a layer of oil film on the bottom of the cookware, thereby creating a "non-stick" effect. After heating is stopped, the cooking oil cools and is stored in the grooves and pores on the inner surface of the cookware. Therefore, cookware with the above structure can maintain a certain level of functionality for a long period of time, but the structure of these small grooves or pores has a significant impact on the non-stick properties of the cookware, and a specific structure is required to achieve good non-stick properties, which places great demands on the manufacturing process, etc. Summary of the Invention

[0007] To solve the above problems, the present invention provides a cookware and a manufacturing method thereof that achieves non-stick effect through a pure inorganic structural layer.

[0008] According to one aspect of the present invention, the cooking utensil includes a base layer and a pure inorganic structural layer, and the pure inorganic structural layer is formed by spraying inorganic particles onto an inner surface of the base layer, and a communicating void structure is formed between the inorganic particles of the pure inorganic structural layer, and the inorganic particles sprayed onto the inner surface of the base layer are pure inorganic particles to which no organic solvent has been added, The purely inorganic structural layer includes at least three sub-inorganic structural layers, which are stacked on the inner surface of the substrate layer in order according to the particle size of the inorganic particles, wherein the particle size of the inorganic particles in the sub-inorganic structural layer adjacent to the substrate layer is the largest, and the particle sizes of the inorganic particles in the multiple sub-inorganic structural layers become smaller in order in the direction away from the substrate layer, thereby causing the voids in the multiple sub-inorganic structural layers to become smaller in order in the direction away from the substrate layer.

[0009] In one embodiment, the inorganic particles have a particle size of 100 nm-60 μm, and the inorganic particles are plasma sprayed, supersonic sprayed, cold sprayed, laser cladding or airless sprayed onto the inner surface of the substrate layer, and the thickness of the purely inorganic structural layer is 61-130 μm.

[0010] In one embodiment, the inorganic particulate material is metal particles, ceramic particles, or carbon powder, and the metal particles are one or more of titanium, titanium alloy, zirconium, zirconium alloy, stainless steel, low carbon steel, high carbon steel, and zinc; the ceramic particles are one or more of zirconium oxide, zirconium nitride, titanium oxide, titanium nitride, titanium carbide, aluminum oxide, magnesium oxide, iron oxide, ferric oxide, boron nitride, calcium oxide, silicon oxide, and silicon nitride; and the carbon powder is one or more of natural graphite, polycrystalline graphite, pyrolytic graphite, highly oriented pyrolytic graphite, and carbon quantum dots.

[0011] In one embodiment, the three sub-inorganic structural layers are an oil reservoir layer, a sustained release hardening layer and a dispersion surface layer, and the oil reservoir layer, the sustained release hardening layer and the dispersion surface layer are arranged in order in a direction away from the substrate layer.

[0012] In one embodiment, the oil reservoir layer, the sustained release curing layer and the dispersing surface layer are laminated in this order.

[0013] In one embodiment, the inorganic particles in the oil reservoir layer have a particle size of 15-60 μm, a thickness of the oil reservoir layer of 40-70 μm, and a porosity of 15-25%; the inorganic particles in the sustained-release hardened layer have a particle size of 1-15 μm, a thickness of the sustained-release hardened layer of 20-40 μm, and a porosity of 5-15%; the inorganic particles in the dispersion surface layer have a particle size of 100 nm-1 μm, and a thickness of the dispersion surface layer of 1-20 μm.

[0014] In one embodiment, the weight ratio of ceramic particles in the oil reservoir layer is 70% or more, the weight ratio of metal particles in the sustained release hardening layer is 60% or more, and the weight ratio of carbon powder in the dispersed surface layer is 50% or more.

[0015] According to another aspect of the present invention, a method for manufacturing the cookware includes: A metal substrate is formed by drawing or die-casting, and then deburred, surface polished and cleaned to form a substrate layer having a thickness of 1 mm or more; spraying inorganic particles onto the inner surface of the substrate layer by cold spraying, plasma spraying, supersonic spraying, laser cladding or airless spraying to form a purely inorganic structural layer; Includes:

[0016] Beneficial Effects of the Invention In the cookware having a pure inorganic structural layer of the present invention, the pure inorganic structural layer comprises at least three sub-inorganic structural layers, which are stacked on the inner surface of the base layer in order according to the particle size of the inorganic particles, and the particle size of the inorganic particles in the sub-inorganic structural layers decreases in order away from the base layer, so that the void structure in the sub-inorganic structural layers decreases in order away from the base layer. This gives the pure inorganic structural layer high bonding strength and toughness, high surface hardness, scratch resistance, and wear resistance. When oil is present in the pot, the surface can absorb the oil, providing oil storage and self-lubrication functions. After heating, the voids can allow the pores to heat and breathe, achieving the effects of anti-sticking and easy cleaning. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a cross-sectional view of a container wall of a cooking utensil having a purely inorganic structural layer as proposed in an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and drawings. Those skilled in the art will understand that the present invention is not limited to the drawings and the following embodiments.

[0019] As used herein, the term "comprises" and its various variations may be understood as open terms, meaning "including but not limited to." The term "based on" and similar expressions may be understood as "based at least on." Terms such as "first," "second," and "third" are merely used to distinguish different features and have no substantive meaning. The terms "left," "right," "middle," and similar expressions are merely used to indicate the positional relationship between relative objects.

[0020] According to one embodiment of the present invention, a cookware that achieves a non-stick effect using a pure inorganic structural layer is provided. The cookware includes a base layer 1 and a pure inorganic structural layer 2. The pure inorganic structural layer 2 is formed by spraying inorganic particles onto the inner surface of the base layer 1. A void structure is formed between the inorganic particles in the pure inorganic structural layer 2. The inorganic particles sprayed onto the inner surface of the base layer are pure inorganic particles to which no organic solvent is added. The pure inorganic structural layer 2 includes at least three sub-inorganic structural layers. The at least three sub-inorganic structural layers are stacked on the inner surface of the base layer 1 in order according to the particle size of the inorganic particles. The particle size of the inorganic particles in the sub-inorganic structural layer adjacent to the base layer 1 is the largest, and the particle size of the inorganic particles in the sub-inorganic structural layers decreases in the direction away from the base layer 1, thereby causing the voids in the sub-inorganic structural layers to decrease in the direction away from the base layer 1.

[0021] Specifically, Figure 1 shows a cross-sectional view of the container wall of a cookware. The cookware in Figure 1 is preferably a frying pan depending on the conditions and effects of use. The cookware includes a substrate layer 1 and a purely inorganic structural layer 2.

[0022] The base layer 1 is the base of the cookware and is usually made of a metal material such as aluminum alloy, stainless steel or iron, and its thickness is usually 1 mm or more.

[0023] The purely inorganic structural layer 2 according to the embodiment of the present invention is formed by spraying inorganic particle material onto the inner surface of the substrate layer 1. The particle size of the inorganic particles is 100 nm-60 μm. The spraying can be achieved by plasma spraying, supersonic spraying, cold spraying, laser cladding technology, airless spraying, etc. The thickness of the purely inorganic structural layer 2 is 61-130 μm.

[0024] The inorganic particle material may be metal particles, ceramic particles, or carbon powder. The metal particles may be one or more of titanium, titanium alloy, zirconium, zirconium alloy, stainless steel, low-carbon steel, high-carbon steel, and zinc. The ceramic particles may be one or more of zirconium oxide, zirconium nitride, titanium oxide, titanium nitride, titanium carbide, aluminum oxide, magnesium oxide, iron oxide, iron sesquioxide, boron nitride, calcium oxide, silicon oxide, and silicon nitride. The carbon powder may be one or more of natural graphite, polycrystalline graphite, pyrolytic graphite, highly oriented pyrolytic graphite, and carbon quantum dots. Because a spraying process is used, the inorganic particles of the pure inorganic structural layer 2 do not adhere to each other, and a void structure is formed between the inorganic particles.

[0025] The purely inorganic structural layer 2 includes at least three sub-inorganic structural layers stacked in order according to the particle size of the inorganic particles. The particle size of the inorganic particles in the sub-inorganic structural layer adjacent to the substrate layer 1 is the largest. The particle sizes of the inorganic particles in the multiple sub-inorganic structural layers decrease in order in the direction away from the substrate layer 1.

[0026] In this embodiment, the three inorganic structural sub-layers are an oil reservoir layer 21, a sustained-release hardening layer 22, and a dispersion surface layer 23, which are stacked in order. The inorganic particles in the oil reservoir layer 21 have a particle size of 15-60 μm. The inorganic particles may be one or more of the metal particles, ceramic particles, and carbon powder. The oil reservoir layer 21 has a thickness of 40-70 μm and a porosity of 15-25%. The inorganic particles in the sustained-release hardening layer 22 have a particle size of 1-15 μm. The inorganic particles may be one or more of the metal particles, ceramic particles, and carbon powder. The sustained-release hardening layer 22 has a thickness of 20-40 μm and a porosity of 5-15%. The inorganic particles in the dispersion surface layer 23 have a particle size of 100 nm-1 μm. The inorganic particles may be one or more of the metal particles, ceramic particles, and carbon powder. The dispersion surface layer 23 has a thickness of 1-20 μm. The "dispersed" surface layer in the present invention refers to inorganic particles not completely covering the sustained-release cured layer 22. For example, the inorganic particles may be dispersed evenly as independent particles covering the sustained-release cured layer 22, and / or may form a plurality of sub-regions of the surface layer uniformly distributed in the form of cracks on the sustained-release cured layer 22, so that the dispersed surface layer 23 does not block the sustained-release cured layer 22, and the surface of the dispersed surface layer 23 has an uneven, matte finish.

[0027] In the three sub-inorganic structure layers, namely, the oil reservoir layer 21, the sustained-release hardened layer 22 and the dispersion surface layer 23, the particle size of the inorganic particles increases in the order of the oil reservoir layer 21, the sustained-release hardened layer 22 and the dispersion surface layer 23, and therefore the voids formed between the inorganic particles also increase in the order of the oil reservoir layer 21, the sustained-release hardened layer 22 and the dispersion surface layer 23.

[0028] In this embodiment, the inorganic particles in the dispersion surface layer 23 have a particle size of 100 nm-1 μm, which is much smaller than the inorganic particles in the oil reservoir layer 21 (15-60 μm) and the inorganic particles in the sustained-release hardened layer 22 (1-15 μm). Therefore, the voids in the oil reservoir layer 21 are relatively large and are used to store oils and fats. The voids in the dispersion surface layer 23 are very small and relatively dense and uniform, which improves the hardness of the dispersion surface layer 23 and facilitates the uniform penetration or deposition of oils and fats. A sustained-release hardened layer 22, whose inorganic particles have an intermediate particle size, is provided between the oil reservoir layer 21 and the dispersion surface layer 23. This layer is a transition layer that has the effect of hardening the coating layer, effectively bonding the oil storage layer 21 and the dispersion surface layer 23, improving the bonding strength and toughness of the pure inorganic structure layer 2, and playing a role in assisting oil storage. When the cookware begins to heat up, as the temperature of the cookware rises, the oil vapor, which is a mixture of oil and gas, must fill the sustained-release hardened layer 22 before it can precipitate from the dispersion surface layer 23. The amount of oil precipitated from the bottom of the cookware can be used to estimate the degree of heating of the cookware.

[0029] Preferably, the oil reservoir layer 21 is mainly composed of ceramic particles, with a weight ratio of the ceramic particles of 70% or more. The sustained-release hardened layer 22 is mainly composed of metal particles, with a weight ratio of the metal particles of 60% or more. The dispersed surface layer 23 is mainly composed of carbon powder, with a weight ratio of the carbon powder of 50% or more. As a result, the lower layer, as the oil reservoir layer, is a ceramic layer mainly composed of ceramic particles, which is mainly a porous layer with a stable structure, high strength, and high hardness. The second layer, as the sustained-release layer, is a composite metal layer mainly composed of metal particles, which improves the toughness of the lower ceramic layer, optimizes the pore structure, increases the pore density, reduces the pore size, improves the stability of the stored oil, and gives the surface a relatively high metallic texture. The third layer is a surface layer mainly made of carbon powder-like material, which provides a self-lubricating functional layer with a self-lubricating effect, a small surface friction coefficient of the dispersed surface layer 23, a small dynamic friction coefficient in the presence of oil, easy cleaning of the surface of the pure inorganic structure layer 2, and high physical anti-stick properties.

[0030] As a result of the accumulation of materials, the pure inorganic structure layer 2 has a three-dimensional structure with voids that can store oil, and an uneven structure is formed on the surface of the pure inorganic structure layer 2. The uneven structure causes parts of the food to float, and the heated oil and fat in the food and the voids on the surface boils slightly, generating a large amount of hot gas, which further pushes the food up, separating the food from the surface and achieving a certain degree of physical anti-stick effect.

[0031] The invention will be described below using a non-stick frying pan as an example.

[0032] During cooking, when the nonstick frying pan is heated, the voids / pores in the pure inorganic structural layer 2 expand due to heat, resulting in very strong adsorption of oil and fat. After oil is added to the nonstick frying pan, the oil completely wets and fills the pores. With continued heating, the oil in the voids boils slightly, generating hot gas. During the cooking process, the slightly boiling oil and hot gas are positioned between the food and the pure inorganic structural layer 2, pushing the food up and separating the food from the pure inorganic structural layer 2. After cooking, as the oil is absorbed by the food and the temperature of the nonstick frying pan decreases, the temperature of the oil in the voids in the pure inorganic structural layer 2 decreases and its volume shrinks, leaving the oil behind. Even after the surface of the nonstick frying pan is cleaned, some oil is still retained in the voids in the coating layer 2, especially in the oil reservoir layer 21. When heated again, the oil precipitates from the voids, maintaining the oil-wet state of the pan bottom. Therefore, the operating principle of the non-stick frying pan of this embodiment is as follows: when the non-stick frying pan is continuously heated, the oil and fat in the pores of the pure inorganic structure layer 2 continuously boils, generating a large amount of hot gas, which causes the cooked ingredients to partially float and rise to the bottom of the non-stick frying pan, thereby achieving the technical effect of "non-stick." Furthermore, for the non-stick frying pan of this embodiment, by boiling it in hot water and cleaning it after cooking, the oil and fat remaining in the pores is replaced, allowing the non-stick frying pan to be thoroughly cleaned.

[0033] Although this embodiment only shows three sequentially stacked inorganic structural layers, those skilled in the art can understand that in order to further improve the bonding strength and toughness of the pure inorganic structural layer 2, one or more sustained-release hardening layers with different inorganic particle sizes may be included between the oil reservoir layer 21 and the dispersion surface layer 23, which is within the scope of protection of the present invention.

[0034] According to another embodiment of the present invention, there is provided a method for manufacturing the cookware, comprising the following steps S1 and S2. S1: Forming of base layer A metal substrate such as an aluminum alloy, stainless steel, or iron is formed by drawing or die-casting, and then burrs are removed, and the surface is polished and cleaned to form a substrate layer 1 having a thickness of 1 mm or more. S2: The base layer 1 is sprayed to form a purely inorganic structural layer 2.

[0035] Inorganic particles are applied to the inner surface of the substrate layer 1 by cold spraying, plasma spraying, supersonic spraying, laser cladding or airless spraying to form a purely inorganic structural layer 2. Note that laser cladding is a type of hot spraying.

[0036] In a preferred embodiment of the present invention, the substrate is preheated to 80-120°C, and inorganic particles, the main component of which is ceramic particles (70% by weight or more), are sprayed onto the inner surface of the substrate layer 1 by plasma spraying or supersonic spraying to form the oil reservoir layer 21. Preferably, plasma spraying is performed on the inner surface of the substrate layer 1 at a spray distance of 10-15 mm using a voltage of 55-65 V, a current of 500-600 A, and a hydrogen gas flow rate of 4-8 L / m, to form an oil reservoir layer 21 with a coating thickness of 40-70 μm and a porosity of 15-25%. For a 30 cm frying pan, spraying for 50-90 seconds is required. This layer serves as a base coating layer, ensuring the hardness and strength of the pure inorganic structural layer 2 and establishing a base porosity layer with a thickness of 40-70 μm.

[0037] Next, the inorganic particles, the main component of which is metal particles (60% by weight or more), are sprayed onto the outer surface of the oil reservoir 21 using a cold spraying process and a supersonic spraying process to form a sustained-release hardened layer 22. Preferably, cold spraying is performed using nitrogen gas at a temperature of 200-400°C, with the spray pressure controlled at 2.0-3.5 MPa and the gas flow rate controlled at 500-900 m / s. Metal particle powder is injected into the gas along the axial direction of the gas, forming a gas-solid two-phase flow. The spraying is performed at a position 10-25 mm from the outer surface of the oil reservoir 21, forming a sustained-release hardened layer 22 with a spray thickness of 2-40 μm and a porosity of 5-15%. For a 30 cm frying pan, spraying for 30-60 seconds is required. During the spraying process, the oil reservoir 21 undergoes appropriate pore filling, secondary deposition, and surface modification, resulting in the formation of a fine micro-nano morphology and increasingly fine porosity.

[0038] Finally, the inorganic particles, the main component of which is carbon powder (50% by weight or more), are sprayed onto the outer surface of the sustained-release hardened layer 22 by laser cladding or spraying to form the dispersed surface layer 23. Preferably, the spraying process is carried out by spraying carbon powder resin at a pressure of 0.4-0.6 MPa at a position 10-25 mm away from the outer surface of the sustained-release hardened layer 22, followed by sintering and hardening at a temperature of 330°C for 8-12 minutes, thereby forming a dispersed surface layer 23 with a thickness of 1-20 μm and having self-lubricating properties on the surface of the sustained-release hardened layer 22, and the surface of the dispersed surface layer 23 has an uneven matte finish.

[0039] A non-stick frying pan according to an embodiment of the present invention is manufactured using the above manufacturing method. Here, the material of the base layer is stainless steel, and the thickness of the base layer is 1.2 mm. The purely inorganic structural layer is composed of three sub-inorganic structural layers: an oil reservoir layer 21, a sustained-release hardening layer 22, and a dispersion surface layer 23. The oil reservoir layer 21 contains 72% by weight of ceramic particles, the inorganic particles have a particle size of 35 μm, the layer thickness is 60 μm, and the porosity is 20%. The sustained-release hardening layer 22 contains 64% by weight of metal particles, the inorganic particles have a particle size of 10 μm, the layer thickness is 30 μm, and the porosity is 15%. The dispersion surface layer 23 contains 50% by weight of carbon powder, the inorganic particles have a particle size of 300 nm, and the layer thickness is 5 μm.

[0040] Physical Indicator Detection 1. Hardness: The pencil hardness reaches 9H or more, and it cannot be scratched by a steak knife, shovel, or steel wool. 2. Super heat resistance: Even when placed in a 500°C oven and heated continuously for an hour, there was no cracking or discoloration on the surface, and no weight loss or other phenomena occurred. 3. Thermal shock: After heating the workpiece to 400°C, it was placed in water at 20°C and subjected to 50 consecutive shocks. No cracks, discoloration, or other changes were observed on the surface. 4. Test method for non-stick properties 1. Fried egg After seasoning according to the standard method, the pan was thoroughly washed. The pan was heated to 150°C, sprayed with oil three times (approximately 5g of oil), heated to 160°C, and eggs were added. It was observed that the eggs were prevented from burning. No more oil was used and the eggs were continued to be cooked. This product was able to cook six eggs in a row without burning under continuous heating conditions without adding oil. 2. Stir-fried shredded pork (two methods) Hot frying pan and cold oil: Heat a pan to 200°C and add oil. Immediately after adding the oil, add the marinated shredded pork and stir-fry. After that, it was observed that the pork did not burn. Hot frying pan and hot oil: Heat a pan to 200°C, add oil, and heat until the oil starts to smoke slightly. Add marinated shredded pork and stir-fry, and observe that it does not burn.

[0041] In the description herein, references to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" mean that the specific features, structures, materials, or characteristics described with reference to the embodiment or example are included in at least one embodiment or example of the present invention. In the description herein, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

[0042] The above is a description of the embodiments of the present invention. However, the present invention is not limited to the above embodiments. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the scope of protection of the present invention.

Claims

1. A cookware that achieves a non-stick effect by a pure inorganic structure layer, The cooking utensil comprises a base layer (1) and a purely inorganic structural layer (2), and the purely inorganic structural layer (2) is formed by spraying inorganic particles onto the inner surface of the base layer (1), and a void structure that communicates between the inorganic particles of the purely inorganic structural layer (2) is formed; The purely inorganic structural layer (2) includes at least three sub-inorganic structural layers, which are stacked on the inner surface of the substrate layer (1) in order according to the particle size of the inorganic particles, wherein the particle size of the inorganic particles in the sub-inorganic structural layer adjacent to the substrate layer (1) is the largest, and the particle sizes of the inorganic particles in the multiple sub-inorganic structural layers decrease in order in the direction away from the substrate layer (1), thereby causing the voids in the multiple sub-inorganic structural layers to decrease in order in the direction away from the substrate layer (1); The three sub-inorganic structure layers are an oil reservoir layer (21), a sustained-release hardened layer (22), and a dispersion surface layer (23), and the oil reservoir layer (21), the sustained-release hardened layer (22), and the dispersion surface layer (23) are arranged in this order in a direction away from the substrate layer (1); The oil reservoir layer (21), the sustained-release hardened layer (22) and the dispersion surface layer (23) are laminated in this order, The inorganic particles in the oil reservoir layer (21) have a particle size of 15-60 μm, the thickness of the oil reservoir layer (21) is 40-70 μm, and the porosity is 15-25%; the inorganic particles in the sustained-release hardened layer (22) have a particle size of 1-15 μm, the thickness of the sustained-release hardened layer (22) is 20-40 μm, and the porosity is 5-15%; the inorganic particles in the dispersion surface layer (23) have a particle size of 100 nm-1 μm, and the thickness of the dispersion surface layer (23) is 1-20 μm; The cooking utensil is characterized in that the main component of the oil reservoir layer (21) is ceramic particles, and the weight ratio of the ceramic particles is 70% or more, the main component of the sustained-release hardened layer (22) is metal particles, and the weight ratio of the metal particles is 60% or more, and the main component of the dispersion surface layer (23) is carbon powder, and the weight ratio of the carbon powder is 50% or more.

2. The cookware of claim 1, characterized in that the inorganic particles have a particle size of 100 nm-60 μm, the inorganic particles are sprayed onto the inner surface of the substrate layer (1) by plasma spraying, supersonic spraying, cold spraying, laser cladding or airless spraying, and the thickness of the purely inorganic structural layer (2) is 61-130 μm.

3. 2. The cookware of claim 1, wherein the inorganic particulate material is metal particles, ceramic particles, or carbon powder; the metal particles are one or more of titanium, titanium alloy, zirconium, zirconium alloy, stainless steel, low-carbon steel, high-carbon steel, and zinc; the ceramic particles are one or more of zirconium oxide, zirconium nitride, titanium oxide, titanium nitride, titanium carbide, aluminum oxide, magnesium oxide, iron oxide, ferric oxide, boron nitride, calcium oxide, silicon oxide, and silicon nitride; and the carbon powder is one or more of natural graphite, polycrystalline graphite, pyrolytic graphite, highly oriented pyrolytic graphite, and carbon quantum dots.

4. A method for manufacturing the cookware according to any one of claims 1 to 3, A step of forming a metal substrate by drawing or die-casting, then removing burrs, polishing the surface and cleaning the metal substrate to form a substrate layer (1) having a thickness of 1 mm or more; spraying inorganic particles onto the inner surface of the substrate layer (1) by cold spraying, plasma spraying, supersonic spraying, laser cladding or airless spraying to form a purely inorganic structural layer (2); A manufacturing method comprising:

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