Cooker

Abstract

The utility model provides a cooker. The cooker comprises a metal base material with a nitriding treatment layer and an inorganic non-metal corrosion-resistant layer, the nitriding treatment layer is a nitride of the metal base material, and the inorganic non-metal corrosion-resistant layer is arranged on the nitriding treatment layer. According to the cooker provided by the embodiment of the utility model, each layer has high binding force, so that the condition of interlayer collapse can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to kitchen utensil technical field, concretely relates to a utensil. BACKGROUND

[0002] At present, some utensils made of metal material (for example, iron) have the problem of easy rusting, therefore, need to be treated for corrosion resistance to manufacture the utensil with corrosion resistance.

[0003] In the prior art, the amorphous layer is usually sprayed on the substrate to form an amorphous layer, and then the amorphous layer is treated by nitriding and oxidation to obtain a utensil with corrosion resistance. The amorphous layer and the substrate are mainly combined by metallurgy and supplemented by mechanical combination. The subsequent nitrogen atoms penetrate into the metal at the interface between the two, which destroys the metallurgical combination and reduces the bonding force between the two, resulting in the collapse of the corrosion-resistant layer formed by the two when subjected to external mechanical impact. SUMMARY

[0004] Therefore, the purpose of the utility model is to provide a utensil to solve the problem of easy collapse between the inorganic non-metallic corrosion-resistant layer and the substrate in the prior art.

[0005] According to the utility model, a utensil is provided, wherein the utensil comprises: a metal substrate with a nitriding treatment layer and an inorganic non-metallic corrosion-resistant layer, the nitriding treatment layer is a nitride of the metal substrate; and the inorganic non-metallic corrosion-resistant layer is arranged on the nitriding treatment layer.

[0006] According to the utensil provided by the utility model, the nitriding treatment layer is a nitride of the metal substrate, which has similar properties to the inorganic non-metallic corrosion-resistant layer. As a transition layer, it can ensure the bonding force between the metal substrate and the inorganic non-metallic corrosion-resistant layer, and reduce the collapse of the corrosion-resistant layer.

[0007] In some embodiments, the inorganic non-metallic corrosion-resistant layer comprises a sprayed layer of metal oxide, a sprayed layer of ore with metal oxide as the main component, or a sprayed layer of granulated powder of metal oxide.

[0008] In these embodiments, the sprayed layer formed by these materials has similar properties to the nitriding treatment layer, which can ensure the bonding force between the metal substrate and the inorganic non-metallic corrosion-resistant layer. In addition, the inorganic non-metallic corrosion-resistant layer formed by these materials has poor activity and will not undergo electrochemical corrosion, which can serve as a protective layer on the metal substrate and has improved corrosion resistance.

[0009] In some embodiments, the metal oxide includes magnetite or black titanium dioxide. The inorganic non-metallic corrosion-resistant layer of the cookware formed by the magnetite and the black titanium dioxide has high chemical stability and can resist the corrosion of various corrosive media, thereby effectively protecting the metal substrate from corrosion. In addition, the magnetite is a black crystal with magnetism, and the black titanium dioxide is also black, which can meet the appearance requirements of the cookware.

[0010] In some embodiments, the ore with the metal oxide as the main component includes magnetite, has certain amorphousness, and can have good corrosion resistance and certain non-stickiness.

[0011] In some embodiments, the granulated powder of the metal oxide includes a granulated powder of titanium oxide and magnetite, and the cookware can be formed by the different properties of titanium oxide and magnetite, respectively, to have better overall properties.

[0012] In some embodiments, the inorganic non-metallic corrosion-resistant layer is a plasma layer or a cold sprayed layer. The plasma layer or the cold sprayed layer is relatively dense, can inhibit the infiltration of corrosive media, and can ensure the corrosion resistance of the cookware; and / or the inorganic non-metallic corrosion-resistant layer has an amorphous structure, which can improve the non-stickiness and wear resistance of the cookware; and / or the particle size of the particles forming the inorganic non-metallic corrosion-resistant layer is 300-500 mesh. The appropriate particle size can facilitate the formation of a dense inorganic non-metallic corrosion-resistant layer, thereby ensuring the corrosion resistance of the cookware; and / or the thickness of the inorganic non-metallic corrosion-resistant layer is d4, wherein 60 microns≤d4≤200 microns. If the thickness of the inorganic non-metallic corrosion-resistant layer is too thick, stress concentration may occur, which increases the risk of cracking or deformation of the cookware during use. In addition, it also increases the material cost, affects the heating efficiency and heat conduction performance of the cookware. If the thickness of the inorganic non-metallic corrosion-resistant layer is too thin, the protection effect is weakened, and the corrosive medium may not be effectively isolated, which may cause the cookware to be easily corroded during use. In addition, the wear resistance and scratch resistance may be reduced, which may be easily damaged, thereby affecting the service life of the cookware. Furthermore, it also increases the difficulty of process control, making it difficult to ensure the uniformity and consistency of the thickness, thereby affecting the overall quality of the cookware.

[0013] In some embodiments, the formation depth of the nitriding treatment layer is d2, wherein 8 microns≤d2≤20 microns. The metal substrate with the nitriding treatment layer can have improved corrosion resistance and hardness without affecting the performance of the substrate.

[0014] In some embodiments, the metal base material is a magnesium base material, an aluminum base material or an iron base material, and the base material type of the cookware is more, and the cookware with respective tendency requirement can be manufactured based on actual needs. And or, the thickness of the metal base material is d1, wherein 1.0mm≤d1≤2.0mm. The metal base material in this thickness range can balance the strength, weight and transmission efficiency of the manufactured cookware and withstand the process requirements of cookware manufacturing. For example, if the thickness of the metal base material is too thin during the manufacturing process of the cookware, it is easy to be deformed under the influence of high temperature during the nitriding treatment, and if the thickness of the metal base material is too thick, the manufactured cookware is too heavy and affects the heat conduction effect.

[0015] In some embodiments, the cookware further comprises a sealing material formed in the pores of the inorganic non-metal corrosion-resistant layer.

[0016] In these embodiments, since the pores of the inorganic non-metal corrosion-resistant layer are effectively sealed, the corrosion of the cookware by the corrosion medium can be greatly slowed down, thereby prolonging the overall service life of the cookware. In addition, the sealing material fills the pores, which can reduce the hiding space for dirt and bacteria, so that the surface of the cookware is easier to clean.

[0017] In some embodiments, the metal base material further has an oxidation treatment layer, wherein the oxidation treatment layer is arranged on the nitriding treatment layer, and the inorganic non-metal corrosion-resistant layer is formed on the oxidation treatment layer.

[0018] In these embodiments, the oxidation treatment layer has very high hardness, which can significantly improve the wear resistance and scratch resistance of the metal base material. The oxidation treatment layer is relatively dense, which can effectively isolate the contact between the corrosion medium and the metal base material, thereby improving the corrosion resistance of the cookware. In addition, the oxidation treatment layer can remain stable at high temperature and is not easy to decompose or fall off, and therefore is suitable for application in high temperature environment.

[0019] In some embodiments, the oxidation treatment layer has a formation depth d3, wherein 3μm≤d3≤6μm. Here, the oxidation layer has a suitable formation depth, on the one hand, it can improve the corrosion resistance and hardness of the metal base material with the nitriding treatment layer without affecting the performance of the base material. On the other hand, in the case that the metal base material contains iron, a black oxide can be formed to lay the foundation for the black appearance of the cookware as a whole. And or, the oxidation treatment layer comprises magnetite, which can ensure the appearance of the cookware. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and other objects and features of the present application will become more apparent from the following description of embodiments taken in conjunction with the accompanying drawings, in which:

[0021] Figure 1is a sectional structure schematic view of a cooking utensil according to an embodiment of the present utility model;

[0022] Figure 2 is Figure 1 is an enlarged structure schematic view at I in the middle;

[0023] Figure 3 is a structure schematic view of a cooking utensil according to another embodiment of the present utility model.

[0024] Symbol explanation:

[0025] 10, metal base material; 11, nitriding treatment layer; 12, oxidation treatment layer; 20, inorganic nonmetallic corrosion-resistant layer. DETAILED DESCRIPTION

[0026] The following detailed description is provided to help the reader obtain a thorough understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be clear to those skilled in the art after understanding the disclosure provided herein. For example, the order of the operations described herein is merely an example, and is not limited to those set forth herein, but can be changed as will be clear to those skilled in the art after understanding the disclosure provided herein, except for operations that must occur in a specific order. In addition, the description of features known in the art can be omitted for the sake of more clarity and conciseness.

[0027] The features described herein can be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided so as to merely show some of the many possible ways of implementing the methods, devices, and / or systems described herein, which will be clear to those skilled in the art after understanding the disclosure provided herein.

[0028] As used herein, the term "and / or" includes any one of the associated listed items, as well as any combination of any two or more of the associated listed items.

[0029] Although terms such as "first", "second", and "third" can be used herein to describe various components, assemblies, regions, layers, or portions, these components, assemblies, regions, layers, or portions should not be limited by these terms. Rather, these terms are merely used to distinguish one component, assembly, region, layer, or portion from another component, assembly, region, layer, or portion. Thus, a first component, a first assembly, a first region, a first layer, or a first portion referred to in the examples described herein can also be referred to as a second component, a second assembly, a second region, a second layer, or a second portion without departing from the teachings of the examples.

[0030] In the description, when elements such as a layer, a region, or a substrate are described as "on", "connected to", or "mounted to" another element, the element can be directly on, directly connected to, or directly mounted to the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is described as being "directly on", "directly connected to", or "directly mounted to" another element, no other elements are interposed therebetween.

[0031] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has", "having" are intended to be inclusive and allow for there to be additional

[0032] The terms "upper", "lower", "inner", "outer" and the like in the present disclosure are defined based on the orientation of the cookware in the normal use state. This definition will help the reader or user to clearly understand the relative position relationship of each component and function, and should not be understood as a limitation of the present disclosure.

[0033] Unless otherwise defined, all terms used herein, including technical terms and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs when the present disclosure is understood. Unless explicitly defined herein, terms such as those defined in a general dictionary should be interpreted as having the same meaning as their meanings in the relevant field of art and the present disclosure, and should not be interpreted too ideally or too formally.

[0034] In addition, in the description of the examples, when it is considered that a detailed description of the related components or functions known to be considered as obscuring the present disclosure will be considered, such a detailed description will be omitted.

[0035] At present, when manufacturing cookware, the iron base material can be nitrided and oxidized to manufacture cookware, and the cookware formed with nitrided iron has good overall corrosion resistance, but the nitrided iron pot has weak performance defect points and is prone to pitting risk. This is mainly due to the fact that the potential of nitrided iron is more positive than that of iron, which leads to the formation of a large cathode and a small anode corrosion situation at the local defect point (such as the intersection between the nitrided iron and the graphite in the iron) position, so that the corrosion rate spreads rapidly from these positions, and even can cause perforation.

[0036] In order to improve the corrosion resistance of the cookware, in some other related technologies, an amorphous material can be plasma sprayed on the substrate to form an amorphous layer, and then the amorphous layer is treated by nitriding and oxidation to obtain a cookware with a corrosion-resistant layer. The amorphous layer and the substrate are mainly combined by metallurgy and supplemented by mechanical combination. The subsequent penetration of nitrogen atoms will make the metal at the interface between the two become nitride, destroy the metallurgical combination between the two, reduce the bonding force between the two, and cause the inorganic non-metallic corrosion-resistant layer to easily collapse when subjected to external mechanical impact. In addition, the cookware formed by first spraying an amorphous alloy and then performing nitriding and oxidation treatment, during nitriding, the amorphous layer will block the penetration of nitrogen atoms, resulting in a decrease in the nitriding contact area with the substrate, and further affecting the uniformity and thickness of the nitriding film, thereby reducing the corrosion resistance of the corrosion-resistant layer. In addition, the overall structure of the plasma layer is not dense, so that the distribution of nitrogen atoms during nitriding is not uniform, thereby affecting the corrosion resistance of the corrosion-resistant layer.

[0037] Based on the above, it is necessary to provide a cookware with good nitriding treatment effect.

[0038] According to the embodiments of the utility model, a kind of cookware is provided, wherein, as shown in Figures 1 to 3 The cookware includes a metal substrate 10 with a nitriding treatment layer 11 and an inorganic non-metallic corrosion-resistant layer 20. The nitriding treatment layer 11 is a nitride of the metal substrate, and the inorganic non-metallic corrosion-resistant layer 20 is stacked on the nitriding treatment layer 11, reducing the collapse of the corrosion-resistant layer.

[0039] According to the cookware provided by the embodiments of the utility model, the nitriding treatment layer 11 is a nitride formed by the metal substrate, which has similar properties to the inorganic non-metallic corrosion-resistant layer 20, and can act as a transition layer to enhance the bonding force between the metal substrate 10 and the inorganic non-metallic corrosion-resistant layer 20.

[0040] The embodiments of the utility model will be described in detail below.

[0041] According to the utility model, the metal substrate 10 is the base part of the cookware, made of magnesium, aluminum or iron metal material, with a nitriding treatment layer 11 on the surface. The nitriding treatment layer 11 is a nitride of the metal substrate.

[0042] According to the utility model, the nitriding treatment layer 11 is tightly combined with the metal substrate 10. The nitriding treatment layer 11 is a nitride generated by the reaction of the metal substrate and nitrogen. Specifically, the metal substrate is exposed to a nitrogen-containing atmosphere (such as nitrogen gas, ammonia gas, etc.), and a chemical reaction occurs between the metal and nitrogen at high temperature, forming a nitriding film on the surface of the metal substrate. The nitride film has similar properties to the inorganic non-metallic corrosion-resistant layer 20, and can act as a transition layer to enhance the bonding force between the metal substrate 10 and the inorganic non-metallic corrosion-resistant layer 20, reducing the collapse and improving the structural stability and durability of the entire cookware.

[0043] In some embodiments, the nitriding treatment layer 11 has a certain depth, which can improve the corrosion resistance and hardness of the metal substrate 10 with the nitriding treatment layer 11 without affecting the performance of the substrate. As an example, the nitriding treatment layer 11 has a forming depth of d2, where 8 microns ≤ d2 ≤ 20 microns.

[0044] According to the present application, the inorganic non-metallic corrosion-resistant layer 20 is arranged on the nitriding treatment layer 11, which can be used as the outermost layer of the inner coating of the cookware, i.e., as the inner surface of the cookware. The inorganic non-metallic corrosion-resistant layer has various forms, including a sprayed layer of metal oxide, a sprayed layer of ore with metal oxide as the main component, or a sprayed layer of granulated powder of metal oxide. The sprayed layer formed by these materials has similar properties to the nitriding treatment layer 11, which can ensure the bonding force between the metal substrate 10 and the inorganic non-metallic corrosion-resistant layer 20. In addition, the inorganic non-metallic corrosion-resistant layer 20 formed by these materials has poor activity and will not undergo electrochemical corrosion, which can be used as a protective layer on the metal substrate and has improved corrosion resistance. It should be noted that the metal oxide, the ore with metal oxide as the main component, and the granulated powder of metal oxide are all commercially available materials.

[0045] In some embodiments, the metal oxide includes magnetite or black titanium dioxide. The inorganic non-metallic corrosion-resistant layer 20 of the cookware formed by magnetite and black titanium dioxide has high chemical stability and can resist the corrosion of various corrosive media, thereby effectively protecting the metal substrate from corrosion. In addition, magnetite is a black crystal with magnetism, and black titanium dioxide is also black, which can meet the appearance requirements of the cookware.

[0046] In some embodiments, the ore with metal oxide as the main component includes magnetite, which has certain amorphousness and can have good corrosion resistance and certain non-stickiness.

[0047] In some embodiments, the granulated powder of metal oxide includes granulated powder of titanium oxide and magnetite, and the sprayed layer formed by the granulated powder of metal oxide can form a cookware with better overall properties by taking advantage of the different properties of titanium oxide and magnetite. It should be noted that the granulated powder of titanium oxide and magnetite is a material available in the prior art.

[0048] In some embodiments, the inorganic non-metallic corrosion-resistant layer 20 is a plasma layer or a cold sprayed layer, which is relatively dense and can inhibit the infiltration of corrosive media, thereby ensuring the corrosion resistance of the cookware.

[0049] In some embodiments, the particle size of the particles forming the inorganic non-metallic corrosion-resistant layer 20 is 300-500 mesh, which can facilitate the formation of a dense inorganic non-metallic corrosion-resistant layer 20 and ensure the corrosion resistance of the cookware.

[0050] In some embodiments, the inorganic non-metallic corrosion-resistant layer 20 has an amorphous structure, which can improve the non-stickiness and wear resistance of the cookware.

[0051] In some embodiments, the inorganic non-metallic corrosion-resistant layer 20 has a thickness d4, where 60 microns ≤ d4 ≤ 200 microns. If the thickness of the inorganic non-metallic corrosion-resistant layer 20 is too thick, it can cause stress concentration, increasing the risk of cracking or deformation of the cookware during use. In addition, it also increases the material cost, affects the heating efficiency and heat conduction performance of the cookware. If the thickness of the inorganic non-metallic corrosion-resistant layer 20 is too thin, the protection effect is weakened, and it may not be able to effectively isolate the corrosion medium, causing the cookware to be easily corroded during use. In addition, it will reduce the wear resistance and anti-scratch ability, be easily damaged, and affect the service life of the cookware. Furthermore, it will also increase the difficulty of process control, making it difficult to ensure the uniformity and consistency of the thickness, and affecting the overall quality of the cookware.

[0052] In some embodiments, the metal substrate 10 is a magnesium substrate, an aluminum substrate, or an iron substrate, and the cookware has more types of substrates, which can be used to manufacture cookware with respective inclination requirements based on actual needs. In preferred embodiments, the metal substrate is an iron substrate, and the nitriding treatment layer 11 includes nitrided iron.

[0053] In some embodiments, the metal substrate 10 has a thickness d1, where 1.0 millimeter ≤ d1 ≤ 2.0 millimeters. The metal substrate in this thickness range can balance the strength, weight, and transmission efficiency of the manufactured cookware, and withstand the process requirements of cookware manufacturing. For example, during the manufacture of the cookware, if the thickness of the metal substrate 10 is too thin, it is easily deformed by high temperature during nitriding treatment, and if the thickness of the metal substrate 10 is too thick, the manufactured cookware is too heavy and affects the heat conduction effect.

[0054] In some embodiments, the cookware further includes a sealing material, which is formed in the pores of the inorganic non-metallic corrosion-resistant layer 20. As an example, the sealing material can be an oil substance, a fluorine coating, or a ceramic coating.

[0055] In these embodiments, since the pores of the inorganic non-metallic corrosion-resistant layer 20 are effectively sealed, the erosion of the cookware by the corrosion medium can be greatly slowed down, thereby prolonging the overall service life of the cookware. In addition, the sealing material fills the pores, which can reduce the hiding space for dirt and bacteria, making the surface of the cookware easier to clean.

[0056] In some embodiments, the metal substrate 10 further has an oxidation treatment layer 12, where the oxidation treatment layer 12 is disposed on the nitriding treatment layer 11, and the inorganic non-metallic corrosion-resistant layer 20 is formed on the oxidation treatment layer 12.

[0057] In the embodiments, the oxidation treatment layer 12 has high hardness, which can significantly improve the wear resistance and scratch resistance of the metal base material. The oxidation treatment layer is relatively dense, which can effectively isolate the contact between the corrosion medium and the metal base material, thereby improving the corrosion resistance of the cookware. In addition, the oxidation treatment layer remains stable at high temperatures and is not prone to decomposition or falling off, so it is suitable for applications in high temperature environments.

[0058] In some embodiments, the oxidation treatment layer 12 has a certain depth, which can improve the corrosion resistance and hardness of the metal base material with the oxidation treatment layer 12 without affecting the performance of the base material. On the other hand, in the case of a metal base material containing iron, the black oxide can be formed to lay the foundation for the black appearance of the overall cookware. As an example, the oxidation treatment layer 12 has a formation depth d3, where 3 microns ≤ d3 ≤ 6 microns.

[0059] In some embodiments, the metal base material is an iron base material, and the oxidation treatment layer 12 includes magnetite. The oxidation treatment layer 12 mainly composed of magnetite can effectively isolate the direct contact between the iron base material and the corrosive substance, thereby significantly improving the corrosion resistance of the cookware. In addition, magnetite has good high temperature resistance and can remain stable at high temperatures without being prone to decomposition or deterioration, so it is very suitable for use in cookware that undergoes high temperature changes during cooking. Furthermore, magnetite has a black color, which can improve the dirt resistance of the formed cookware.

[0060] As shown in Figure 1 and Figure 2 , the cookware includes a layered coating, specifically, a metal base material 10 with a nitriding treatment layer 11 and an inorganic non-metal corrosion-resistant layer 20. The nitriding treatment layer 11 is formed on the metal base material 10, and the inorganic non-metal corrosion-resistant layer 20 is formed on the nitriding treatment layer 11. The inorganic non-metal corrosion-resistant layer 20 includes a sprayed layer of metal oxide, a sprayed layer of ore mainly composed of metal oxide, or a sprayed layer of granulated powder of metal oxide.

[0061] As shown in Figure 3 , the metal base material 10 further includes an oxidation treatment layer 12, wherein the oxidation treatment layer 12 is disposed on the nitriding treatment layer 11, and the inorganic non-metal corrosion-resistant layer 20 is formed on the oxidation treatment layer 12.

[0062] According to the second aspect of the present application, the base material is nitrided, and then a layer similar to the material after nitriding is formed thereon, so that the inorganic non-metal corrosion-resistant layer of the cookware and the base material are well combined, and the corrosion resistance life of the cookware is ensured.

[0063] According to the present application, a manufacturing method of cookware is provided, wherein the manufacturing method of cookware comprises:

[0064] Step S101, providing a metal substrate.

[0065] Step S102, performing nitriding on the metal substrate to form a nitriding treatment layer 11 on the metal substrate inorganic non-metal corrosion-resistant layer 20, to obtain a metal substrate 10 with a nitriding treatment layer 11.

[0066] Step S103, spraying a metal oxide, an ore with a metal oxide as the main component, or a granulated powder of a metal oxide on the nitriding treatment layer 11 to form an inorganic non-metal corrosion-resistant layer 20.

[0067] According to the method for manufacturing the cookware, the metal substrate is first subjected to nitriding treatment to form a nitriding treatment layer. Then, a material similar to that of the nitriding treatment layer is sprayed on the nitriding treatment layer to form an inorganic non-metal corrosion-resistant layer. Here, the inorganic non-metal corrosion-resistant layer is made of a material similar to that of the nitriding treatment layer, which can ensure good compatibility and bonding force between the inorganic non-metal corrosion-resistant layer and the nitriding treatment layer. In this way, by using the nitriding treatment layer as an intermediate layer, the bonding force between the metal substrate and the inorganic non-metal corrosion-resistant layer can be enhanced, and the corrosion-resistant life of the cookware can be ensured.

[0068] According to some embodiments of the present application, the method for manufacturing the cookware further comprises: after step S102 and before step S103, performing step S104, which comprises performing oxidation treatment to form an oxidation treatment layer 12 on the nitriding treatment layer 11, to obtain a metal substrate 10 with a nitriding treatment layer 11 and an oxidation treatment layer 12.

[0069] In the following, the method for manufacturing the cookware according to the present application will be described in conjunction with specific embodiments.

[0070] Providing a metal substrate

[0071] According to the present application, the metal substrate has a basic structure formed by stretching or spinning a metal material to include a receiving cavity. In some embodiments, the thickness of the metal substrate is d1, where 1.0mm≤d1≤2.0mm, so that the thickness can reduce the weight of the cookware finally manufactured.

[0072] In some embodiments, the inner surface or the outer surface of the metal substrate has a rough structure with a roughness of 3μm-6μm. As an example, the metal substrate is subjected to sanding treatment so that the metal substrate has a rough structure with a surface roughness of 3μm-6μm. Such roughness can improve the bonding force between the layers and the metal substrate and improve the interlayer bonding force of the layers.

[0073] Nitriding treatment

[0074] According to the utility model, the manufacturing method of the cookware further comprises a step of nitriding treatment, and through the nitriding treatment, the metal base material 10 can comprise a nitriding treatment layer. Specifically, the metal base material 10 is placed in a nitriding furnace, nitrogen is introduced, and a nitriding reaction is carried out at a set temperature. During the nitriding process, nitrogen atoms can chemically react with the metal on the surface of the base material, for example, to form nitride iron (Fe3N), thereby forming a nitriding treatment layer on the metal base material 10.

[0075] Specific steps include, before nitriding treatment, the cookware with the metal base material 10 needs to be preheated first. The purpose of preheating is mainly to reduce the thermal stress generated when the cookware suddenly enters the high-temperature nitriding furnace, to avoid deformation or damage of the cookware due to thermal expansion and contraction. Then, the preheated cookware with the metal base material 10 is placed in the nitriding furnace, and the temperature of the nitriding furnace is set to 590-650 DEG C, the pressure is 0.05-0.1 MPa, and at the same time, nitrogen is introduced for 4-6 hours, which chemically reacts with the iron element on the surface of the metal base material 10 to form hard compounds such as nitride iron (Fe3N), thereby obtaining the metal base material 10 with the nitriding treatment layer 11.

[0076] In these embodiments, through the nitriding treatment, the metal base material 10 forms a dense nitriding treatment layer, which has extremely high hardness and can significantly improve the wear resistance and corrosion resistance of the cookware coating. In addition, the nitriding treatment layer can effectively prevent the remaining base material from directly contacting corrosive substances in the external environment, thereby slowing down or preventing the occurrence of corrosion reactions and improving the corrosion resistance of the cookware.

[0077] It should be noted that the utility model does not have special requirements for the content of each component of the nitriding treatment layer after nitriding treatment, and those skilled in the art can perform nitriding treatment on the metal base material 10 for a certain period of time under a certain concentration of nitrogen atoms according to the teaching of the utility model, so as to obtain the nitriding treatment layer according to the utility model.

[0078] Oxidation treatment

[0079] According to the utility model, after the nitriding treatment, the manufacturing method of the cookware further comprises a step of oxidation treatment, and through the oxidation treatment, an oxidation treatment layer 12 is formed by the oxidation reaction of iron atoms and the like on the nitriding treatment layer, the oxidation treatment layer 12 has a certain lipophilicity, which can further improve the non-stickiness of the cookware, and can also improve other properties of the cookware, such as appearance, corrosion resistance, etc.

[0080] As a specific example, the metal substrate 10 with the nitriding treatment layer is placed in an oxygenation furnace. The furnace temperature of the oxygenation furnace is adjusted to 450-500 DEG C. Distilled water is continuously fed into the oxygenation furnace at a flow rate of 10-15 g / s for a duration of 1.5-3 h. After the oxidation treatment layer 12 is formed, the feeding of the distilled water is stopped. The furnace temperature is reduced to 50 DEG C at a cooling rate of 2-4 DEG C / min. The oxidation treatment layer 12 is gradually cooled to room temperature.

[0081] According to the present application, the oxidation treatment layer 12 is usually dark in color, which can provide good appearance protection for the cookware. In addition, the oxidation treatment layer 12 can significantly improve the non-stick performance, corrosion resistance and wear resistance of the cookware.

[0082] It should be noted that the present application does not have special requirements for the content of each component of the oxidation treatment layer 12 after oxidation treatment. Those skilled in the art can perform oxidation treatment on the nitriding treatment layer for a certain time under a certain oxygen atom concentration according to the teaching of the present application, so as to obtain the oxidation treatment layer 12 according to the present application.

[0083] Forming an inorganic non-metallic corrosion resistant layer

[0084] According to some embodiments of the present application, the cold sprayed metal oxide, the ore or the granulated powder of the metal oxide with the metal oxide as the main component is used to form the inorganic non-metallic corrosion-resistant layer on the metal substrate 10. Specifically, the material is accelerated to a supersonic state by using high-pressure gas (such as nitrogen, helium, etc.), and then impacts the surface of the metal substrate 10. During the impact process, due to the huge impact energy, the material is plastically deformed to a large extent, and forms a metallurgical bond or a mechanical bond with the surface of the metal substrate 10, so as to deposit a dense accumulation layer on the metal substrate 10 as the inorganic non-metallic corrosion-resistant layer. The metallurgical bond is realized by atomic diffusion and chemical reaction between the material and the metal substrate 10, and the mechanical bond is realized by plastic deformation and embedding of the material into the surface of the metal substrate 10. Through the above two ways, the adhesion of the coating is enhanced. In addition, the inorganic non-metallic corrosion-resistant layer formed by cold spraying has excellent wear resistance, corrosion resistance and high-temperature stability, etc., so that the service life of the cookware can be guaranteed.

[0085] According to a specific example, the parameters of the cold spraying process can be: the cold spraying carrier gas is nitrogen, the carrier gas pressure is 10-15 MPa, the preheating temperature is 200-350 DEG C, the spraying distance is 25-30 mm, the powder feeding rate is 10-80 g / min, the gun moving rate is 1-3 mm / s, and the rotation speed of the metal substrate 10 is 80-100 r / min.

[0086] According to some embodiments of the present application, the inorganic non-metallic corrosion-resistant layer is formed by plasma spraying of metal oxides, ores with metal oxides as the main component or granulated powder of metal oxides. In some embodiments, the process parameters of plasma spraying can be: current 80A-100A; voltage 60V-90V; main gas (argon) flow rate 1200L / h-1800L / h; hydrogen flow rate 40L / h-100L / h; powder feeding gas flow rate 400L / h-600L / h; powder feeding amount 50g / min-100g / min; spraying distance (gun nozzle to workpiece distance) 10cm-15cm; spraying angle 45°-80°; workpiece temperature normal temperature.

[0087] In some embodiments, the inorganic non-metallic corrosion-resistant layer is formed by metal oxides, ores with metal oxides as the main component or granulated powder of metal oxides. The metal oxides, ores with metal oxides as the main component or granulated powder of metal oxides can be spherical or ellipsoidal particles. In this way, a more dense inorganic non-metallic corrosion-resistant layer can be formed by spherical close packing. As an example, the metal oxides, ores with metal oxides as the main component or granulated powder of metal oxides are in the form of particles, and the particle size of the particles is in the range of 300-500 mesh. The particles in this size range can maintain sufficient kinetic energy to deform when impacting the metal substrate and have good bonding degree with the metal substrate, and can ensure the uniformity and density of the obtained inorganic non-metallic corrosion-resistant layer 20.

[0088] Forming a sealing layer

[0089] According to the present application, a sealing material is used, for example, including oil substances, fluorine paint or ceramic paint. Specifically, the oil substances include peanut oil, linseed oil, animal oil and rapeseed oil, etc., and the fluorine paint or ceramic paint is the surface oil of the existing paint. The sintering temperature is set to 300-350℃, so that the non-stick material penetrates into the pores of the inorganic non-metallic corrosion-resistant layer and is cross-linked and solidified during the sintering process, thereby solidifying the sealing material in the pores of the inorganic non-metallic corrosion-resistant layer and playing a sealing protection role.

[0090] Although the embodiments of the present application have been described in detail above, those skilled in the art can make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the present application. However, it should be understood that these modifications and variations will still fall within the spirit and scope of the embodiments of the present application as defined by the claims.

Claims

1. A cooking appliance characterized by, The cookware comprises: a metal base material (10) having a nitriding treatment layer (11) which is a nitride of the metal base material; an inorganic non-metal corrosion-resistant layer (20) provided on the nitriding treatment layer (11).

2. The cooker according to claim 1, characterized in that The inorganic non-metal corrosion-resistant layer (20) comprises a sprayed layer of metal oxide or a sprayed layer of ore having metal oxide as a main component.

3. The cooker according to claim 2, characterized in that The metal oxide comprises triiron tetroxide or black titanium dioxide.

4. The cooker according to claim 2, characterized in that, The ore having metal oxide as a main component comprises magnetite.

5. The cookware according to claim 1, wherein the inorganic non-metal corrosion-resistant layer (20) is a plasma layer or a cold sprayed layer; and / or, the inorganic non-metal corrosion-resistant layer (20) has an amorphous structure; and / or, the particle size of the particles forming the inorganic non-metal corrosion-resistant layer (20) is 300-500 mesh; and / or, the thickness of the inorganic non-metal corrosion-resistant layer (20) is d4, wherein 60 microns ≤ d4 ≤ 200 microns.

6. The cooker according to claim 1, characterized in that, the depth of formation of the nitriding treatment layer (11) is d2, wherein 8 microns ≤ d2 ≤ 20 microns.

7. The cooker according to claim 1, characterized in that, the metal base material (10) is a magnesium base material, an aluminum base material or an iron base material; and or, the thickness of the metal base material (10) is d1, wherein 1.0 millimeter ≤ d1 ≤ 2.0 millimeters.

8. The cooker according to claim 1, characterized in that, The cookware further comprises a sealing material formed in the pores of the inorganic non-metal corrosion-resistant layer (20).

9. The cookware of any one of claims 1 to 8, wherein, The metal base material (10) further has an oxidation treatment layer (12), wherein the oxidation treatment layer (12) is provided on the nitriding treatment layer (11), and the inorganic non-metal corrosion-resistant layer (20) is formed on the oxidation treatment layer (12).

10. The cooker according to claim 9, characterized in that the depth of formation of the oxidation treatment layer (12) (32) is d3, wherein 3 microns ≤ d3 ≤ 6 microns; and or, the oxidation treatment layer (12) comprises triiron tetroxide.

Images