Cooker

Abstract

The utility model provides a cooker. The cooker comprises an aluminum base body, a first hard layer stacked on the aluminum base body and a second hard layer stacked on the first hard layer, and the porosity of the first hard layer is smaller than that of the second hard layer. According to the cooker provided by the utility model, the hardness of the aluminum substrate is enhanced through the first hard layer and the second hard layer which are stacked, so that the hardness and the strength of the cooker can be improved while the light characteristic is maintained. Besides, the porosity of the first hard layer of the cooker is smaller than that of the second hard layer, and the first hard layer with the smaller porosity is positioned on the aluminum substrate, so that a corrosive medium can be effectively prevented from being in direct contact with the aluminum substrate, and the occurrence of corrosion is slowed down or prevented. Meanwhile, the porosity of the second hard layer is large, oil storage can be facilitated, and the second hard layer can be covered with an oil film in the cooking process, so that the cooker can be further protected from being corroded, and meanwhile, the cooker obtains certain non-stickiness.

Description

TECHNICAL FIELD

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

[0002] Cookware made of aluminum base material is favored due to its lightweight property, but aluminum material is prone to corrosion during use, which limits its application range. To overcome this problem, the traditional approach is to spray liquid organic coating (such as polytetrafluoroethylene coating) on the surface of aluminum alloy non-stick pot, to form a non-stick layer and improve corrosion resistance. However, this organic coating has two major defects: one is not wear-resistant, easy to fall off under the scraping of kitchen utensils such as spatula; the second is not high-temperature resistant, long-term high-temperature cooking may cause coating failure. These problems result in shorter service life of cookware.

[0003] In view of the limitations of organic coating, it is obviously necessary to develop aluminum non-stick pot with corrosion resistance and lightweight. SUMMARY

[0004] Therefore, the purpose of the utility model is to provide a kind of cookware that can provide corrosion resistance and lightweight.

[0005] The first aspect of the utility model aims to provide a kind of cookware, wherein the cookware includes an aluminum base, a first hard layer laminated on the aluminum base, and a second hard layer laminated on the first hard layer, and the porosity of the first hard layer is less than that of the second hard layer.

[0006] According to the cookware provided by the utility model, the first hard layer and the second hard layer are laminated to enhance the hardness of the aluminum base, thereby being able to improve the hardness and strength of the cookware while maintaining the lightweight property. In addition, the porosity of the first hard layer of the cookware is less than that of the second hard layer, and since the first hard layer with smaller porosity is located above the aluminum base, it can effectively block the corrosion medium (such as moisture, acid and alkali, etc.) from directly contacting the aluminum base, thereby slowing down or preventing corrosion. At the same time, the second hard layer has larger porosity, which can store oil and be covered by oil film during cooking, thereby further protecting the cookware from corrosion and making the cookware obtain certain non-stick property.

[0007] In some embodiments, the pore size of the first hard layer is smaller than that of the second hard layer. Here, the first hard layer is more dense, which can block the penetration of corrosion medium (such as water, acid and alkali, etc.) to the aluminum base, helping to prolong the service life of the cookware. The second hard layer is relatively porous, which can absorb and store oil substances, on the one hand, to ensure that the cookware is non-stick during cooking, and on the other hand, since the pores are blocked by oil substances, i.e. a protective layer is formed, which can prevent the corrosion medium from penetrating into the aluminum base, thereby further improving the overall corrosion resistance of the cookware.

[0008] In some embodiments, the second hard layer has a greater hardness than the first hard layer. The second hard layer with greater hardness is arranged close to the inner surface of the cookware, so that it can better resist scratches and impacts during cooking, thereby prolonging the service life of the cookware.

[0009] In some embodiments, the first hard layer comprises a titanium layer or an iron layer; and / or, the second hard layer comprises a titanium alloy layer or an iron alloy layer, so that the purpose of the second hard layer having a greater hardness than the first hard layer can be achieved through material arrangement.

[0010] In some embodiments, the particle size of the material forming the first hard layer is 80-150 microns; and / or, the particle size of the material forming the second hard layer is 200-250 microns. Within the above particle size range, not only can the pore structure of each layer be easily formed, but also better interlayer bonding can be achieved, thereby optimizing the overall performance of the cookware.

[0011] In some embodiments, the porosity of the first hard layer is 5-10%; and / or, the porosity of the second hard layer is 10-20%; and / or, the pore size of the first hard layer is 10-20 microns; and / or, the pore size of the second hard layer is 40-50 microns.

[0012] In these embodiments, the porosity and pore size of the first hard layer and the second hard layer are within the above ranges, which can balance the performance of the cookware in terms of corrosion resistance, wear resistance, bonding strength, and thermal conductivity performance.

[0013] In some embodiments, the thickness of the aluminum base is H1, wherein 2.6mm≤H1≤3.0mm, so that the aluminum base with such thickness can make the cookware lighter in weight, thereby achieving the purpose of lightness. And / or, the thickness of the first hard layer is H2, wherein 30 microns≤H2≤150 microns, so that such thickness can provide a better protective barrier and reduce the possibility of corrosion medium penetrating into the aluminum base. In addition, it can also avoid the influence of excessive thickness on the thermal conductivity and weight of the cookware. And / or, the thickness of the second hard layer is H3, wherein 10 microns≤H3≤30 microns, which as a layer directly contacting with food materials, appropriate thickness can provide enough pores to adsorb and store cooking oil, thereby forming a protective film during cooking, effectively reducing the direct contact between food materials and the cookware, preventing sticking and burning. In addition, the second hard layer with the above thickness can avoid the influence of excessive thickness on the thermal conductivity and weight of the cookware.

[0014] In some embodiments, the surface layer of the second hard layer has a nitriding treatment layer, which can improve the corrosion resistance, wear resistance and high temperature resistance of the cookware. The nitriding treatment layer has a forming depth of H4, where 5 microns≤H4≤20 microns. Such a depth can effectively improve the corrosion resistance, wear resistance and non-stick performance of the cookware, while avoiding adversely affecting the original performance of the aluminum base. Moreover, the manufacturing cost of the cookware can be effectively controlled.

[0015] In some embodiments, the second hard layer has a porous structure filled with an oil substance. Pre-filling the oil substance in the porous structure can further improve the initial non-stick performance of the cookware and ensure the long-term non-stick performance of the cookware.

[0016] In some embodiments, the cookware further comprises a magnetic conductive layer formed on the outer surface of the aluminum base, so that the cookware can be suitable for both induction cookers and open flames, and can provide users with more cooking options and flexibility. As a specific example, the magnetic conductive layer is at least one of iron layer, nickel layer and cobalt layer. These magnetic conductive materials have excellent magnetic conductive performance and can achieve the purpose of magnetic conductive of the cookware.

[0017] In some embodiments, the cookware further comprises a protective layer covering the outer side of the magnetic conductive layer, for protecting the magnetic conductive layer from being directly exposed to the outside and being damaged or having magnetic leakage.

[0018] In some embodiments, the protective layer is an aluminum layer having a nitriding region in the outer layer, which can further enhance the hardness, wear resistance and corrosion resistance of the protective layer. BRIEF DESCRIPTION OF DRAWINGS

[0019] 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:

[0020] Figure 1 is a sectional view of a cookware according to an embodiment of the present application;

[0021] Figure 2 is Figure 1 is an enlarged structural schematic view of position I in FIG. 4.

[0022] SYMBOL DESCRIPTION

[0023] 10, aluminum base;

[0024] 20, first hard layer;

[0025] 30, second hard layer;

[0026] 31, nitriding treatment layer;

[0027] 40, magnetic permeability layer; 50, protective layer; 51, nitrided region. DETAILED DESCRIPTION

[0028] The following detailed description is presented to aid in understanding the method, apparatus and / or system described herein. It is not intended to limit the method, apparatus and / or system described herein to the exact construction as described. Various changes, modifications and equivalents can be resorted to without departing from the spirit of the disclosure. For example, the order in which operations are described is not necessarily the order in which they are performed. Additionally, the various features described herein are not necessarily mutually exclusive, and can be used in combination with each other. Moreover, in understanding the disclosure, the following description is used to provide further location and / or context for various features described herein. Accordingly, the following description is not intended to limit the scope of the method, apparatus and / or system described herein but is intended to provide linguistic context where appropriate.

[0029] The features described herein can be implemented in different ways depending upon the particular application. Rather than be limited to any particular implementation described herein, the examples described herein are intended to illustrate some of the many possible ways in which the method, apparatus and / or system described herein can be implemented.

[0030] 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.

[0031] Although terms such as "first", "second", and "third" can be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, the first element, first component, first region, first layer or first section referred to in the examples described herein can also be referred to as a second element, second component, second region, second layer or second section without departing from the teachings of the examples.

[0032] In the description, when an element such as a layer, a region, or a substrate is referred to as being "on" another element, "connected to" or "mounted to" another element, it can be directly on the other element, directly connected to or mounted to the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on" another element, "directly connected to" or "directly mounted to" another element, there are no other elements interposed therebetween.

[0033] 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" as used herein, specify the presence of stated features, numbers, operations, components, elements, and / or groups thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, components, elements, and / or groups thereof.

[0034] The terms "upper", "lower", "inner", "outer" and the like used in the present disclosure are defined based on the orientation of the cookware in the normal use state. Such definition will help the reader or user to clearly understand the relative positional relationship of the components and functions, and should not be understood as a limitation of the present disclosure.

[0035] 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, for example, terms defined in a general dictionary should be interpreted as having the same meaning as their meanings in the context of the relevant art and the present disclosure, and should not be interpreted ideally or too formally.

[0036] In addition, in the description of the examples, when it is considered that a detailed description of the related components or functions that are well known will cause a blurred understanding of the present disclosure, such detailed description will be omitted.

[0037] The cookware according to the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Figures 1 to 2

[0038] The cookware according to the present disclosure not only has the advantages of light weight, wear resistance, etc., but also has good corrosion resistance.

[0039] According to the embodiments of the present disclosure, a cookware is provided, wherein, as shown in Figure 1 and Figure 2 The cookware includes an aluminum base 10, a first hard layer 20 laminated on the inner surface of the aluminum base 10, and a second hard layer 30 laminated on the first hard layer 20, and the porosity of the first hard layer 20 is less than the porosity of the second hard layer 30.

[0040] ​According to the cooking utensil, the first hard layer 20 and the second hard layer 30 are arranged in a stacked mode to enhance the hardness of the aluminum base 10, so that the hardness and strength of the cooking utensil can be improved while the light weight characteristic is maintained. In addition, the porosity of the first hard layer 20 is less than the porosity of the second hard layer 30, and the first hard layer 20 with the smaller porosity is arranged on the aluminum base 10, so that the first hard layer 20 can effectively prevent the corrosive medium (such as moisture, acid and alkali) from directly contacting the aluminum base 10, thereby slowing down or preventing corrosion. Meanwhile, the second hard layer 30 has a larger porosity, so that the second hard layer 30 can be covered by an oil film during cooking to further protect the cooking utensil from corrosion and make the cooking utensil have certain non-stickiness.

[0041] According to the utility model, the aluminum base 10 has a basic structure including a receiving cavity formed by an aluminum alloy, aluminum or cast aluminum through a stretching or spinning mode. Figure 1 The basic shape of the aluminum base 10 can be seen.

[0042] According to the utility model, the porosity size of the first hard layer 20 is less than the porosity size of the second hard layer 30. Here, the first hard layer 20 is more dense, so that the first hard layer 20 can prevent the corrosive medium (such as water, acid and alkali) from penetrating into the aluminum base 10 and help to prolong the service life of the cooking utensil. The second hard layer 30 is relatively porous, so that the second hard layer 30 can absorb and store oil substances, on the one hand, the cooking utensil can be non-stick during cooking, and on the other hand, the pores are blocked by the oil substances, that is, a protective layer is formed, so that the corrosive medium can be prevented from penetrating into the aluminum base, thereby the corrosion resistance of the cooking utensil as a whole can be further improved.

[0043] According to the utility model, the hardness of the second hard layer 30 is greater than the hardness of the first hard layer 20. The second hard layer 30 with the greater hardness is arranged close to the inner surface of the cooking utensil, so that the second hard layer 30 can better resist scratches and impacts during cooking, thereby the service life of the cooking utensil can be prolonged.

[0044] In some embodiments, the first hard layer 20 is a pure metal layer, for example, a titanium layer or an iron layer, and the second hard layer 30 is an alloy layer corresponding to the metal forming the first hard layer 20, for example, a titanium alloy layer or an iron alloy layer, so that the purpose that the hardness of the second hard layer 30 is greater than the hardness of the first hard layer 20 can be achieved by material setting.

[0045] In these embodiments, the first hard layer 20 serves as a transition layer of hardness between the aluminum base 10 and the second hard layer 30, which helps to achieve a smooth transition of hardness, thereby effectively avoiding stress concentration and interlayer peeling problems caused by too large hardness difference. At the same time, the similar material between the pure metal layer and the alloy layer can also promote the enhancement of interlayer bonding force, further reducing the risk of interlayer peeling. In addition, the second hard layer 30 is an alloy layer, which has higher hardness and strength than the pure metal layer, and can better resist wear and scratches during cooking, thereby prolonging the service life of the cookware.

[0046] It should be noted that the second hard layer 30 is a metal corresponding alloy layer, which is formed by existing alloy materials, and the utility model does not limit the composition and proportion of the alloy.

[0047] In some embodiments, the particle size of the material forming the first hard layer 20 is smaller than the particle size of the material forming the second hard layer 30, and the particles with smaller particle size can be densely packed to form a more dense structure. Therefore, when the first hard layer 20 is formed using particles with smaller particle size, a layer with fewer and smaller pores (i.e., low porosity) is formed. Conversely, when the second hard layer 30 is formed using particles with larger particle size, a layer with more and larger pores (i.e., high porosity) is formed. In this way, the pore distribution form of the first hard layer 20 and the second hard layer 30 can be easily formed by controlling the particle size, so that the corrosion resistance of the cookware is guaranteed, and the method is relatively simple and easy to implement.

[0048] In some embodiments, the material forming the first hard layer 20 is a particle with a particle size of 80-150 microns, and the material forming the second hard layer 30 is a particle with a particle size of 200-250 microns. Within the above-mentioned particle size range, not only can the pore structure of each layer be easily formed, but also better interlayer bonding force can be achieved, thereby optimizing the overall performance of the cookware.

[0049] In some embodiments, the porosity of the first hard layer 20 is 5-10%, and the porosity of the second hard layer 30 is 10-20%; the pore size of the first hard layer 20 is 10-20 microns, and the pore size of the second hard layer 30 is 40-50 microns.

[0050] In these embodiments, the porosity and pore size of the first hard layer 20 and the second hard layer 30 are within the above-mentioned range, which can balance the performance of the cookware in terms of corrosion resistance, wear resistance, bonding force, and thermal conductivity performance, etc.

[0051] According to the utility model, the thickness of the first hard layer 20 and the second hard layer 30 is micron level, and the thickness of the aluminum base 10 is millimeter level, and since the thickness of the first hard layer 20 and the second hard layer 30 is small, they have little effect on the overall weight of the final cooker. Therefore, the weight of the formed cooker is less affected, and thus, a lightweight and hardness-enhanced cooker can be obtained.

[0052] In some embodiments, the thickness of the aluminum base 10 is H1, wherein 2.6mm≤H1≤3.0mm, and such thickness of the aluminum base 10 can make the weight of the cooker lighter, facilitating the purpose of lightweight.

[0053] In some embodiments, the thickness of the first hard layer 20 is H2, wherein 30 microns≤H2≤150 microns. Such thickness can provide a better protective barrier and reduce the possibility of corrosion medium penetrating into the aluminum base. In addition, it can also avoid the influence of excessive thickness on the heat conductivity and weight of the cooker.

[0054] In some embodiments, the thickness of the second hard layer 30 is H3, wherein 10 microns≤H3≤30 microns, and as a layer directly contacting with food materials, the appropriate thickness can provide sufficient pores to adsorb and store cooking oil, thereby forming a protective film during cooking to effectively reduce the direct contact between food materials and the cooker, preventing sticking and burning. In addition, the second hard layer 30 with the above thickness can avoid the influence of excessive thickness on the heat conductivity and weight of the cooker.

[0055] In some embodiments, the surface layer of the second hard layer 30 has a nitriding treatment layer 31, which can improve the corrosion resistance, wear resistance and high temperature resistance of the cooker. The formation depth of the nitriding treatment layer 31 is H4, wherein 5 microns≤H4≤20 microns, and such depth can effectively improve the corrosion resistance, wear resistance and non-stick performance of the cooker, while avoiding adverse effects on the original performance of the aluminum base 10. Moreover, it can effectively control the manufacturing cost of the cooker.

[0056] According to the utility model, the cooker can be suitable for induction cooker, and in this case, the outer surface of the cooker is provided with a magnetic conductive layer.

[0057] In some embodiments, the cooker further comprises a magnetic conductive layer formed on the outer surface of the aluminum base, and the magnetic conductive layer is at least one of iron layer, nickel layer and cobalt layer.

[0058] In these embodiments, the cooker can be suitable for both induction cooker and open fire, which can provide users with more cooking options and flexibility.

[0059] In some embodiments, the cooker further comprises a protective layer 50 covering the outer side of the magnetic conductive layer, for protecting the magnetic conductive layer and avoiding damage or magnetic leakage caused by direct exposure.

[0060] In some embodiments, the protective layer is an aluminum layer with an outer layer including nitrided regions 51. This not only reduces the weight of the cookware, but also provides good hardness, wear resistance and corrosion resistance due to the nitrided regions 51.

[0061] like Figure 1 and Figure 2 As shown, the cookware includes an aluminum substrate 10, an inner coating with a stacked structure formed on the inner surface of the aluminum substrate 10, and an outer coating with a stacked structure formed on the outer surface of the aluminum substrate 10. The inner coating includes a first hard layer 20 stacked on the inner surface of the aluminum substrate 10 and a second hard layer 30 stacked on the surface of the first hard layer 20. The surface of the second hard layer 30 has a nitrided layer 31, and the surface of the nitrided layer 31 serves as the inner surface of the cookware. The outer coating includes a magnetically conductive layer 40 formed on the outer surface of the aluminum substrate and a protective layer 50 covering the outer side of the magnetically conductive layer 40. The outer layer of the protective layer 50 includes a nitrided region 51.

[0062] In some embodiments, the second hard layer 30 has a porous structure filled with an oily substance. The oily substance has good lubricity and non-stick properties, and can form a protective oil film during cooking, reducing direct contact between food and cookware, thereby preventing sticking and burning.

[0063] In some embodiments, the oil is animal oil, vegetable oil, or silicone oil. All of these oils can fill the porous structure, improve the overall non-stick properties of the cookware, and prevent corrosive media from penetrating inward to further optimize the corrosion resistance of the cookware.

[0064] According to a second aspect of the present invention, a method for manufacturing a cookware is provided, wherein the method includes:

[0065] Step S101: Plasma spraying of metal material to form a first hard layer on the aluminum substrate.

[0066] Step S102: Plasma spraying of alloy material to form a second hard layer on the first hard layer.

[0067] Step S103, nitriding treatment is performed so that the surface of the second hard layer includes a nitrided layer.

[0068] The following describes a method for manufacturing a cooker according to the present invention with reference to specific embodiments.

[0069] Providing an aluminium base

[0070] According to the utility model, the aluminum base has a basic structure including a receiving cavity formed by stretching or spinning of aluminum alloy, aluminum or cast aluminum. In some embodiments, the thickness of the aluminum base is H1, wherein 2.6mm≤H1≤3.0mm, and such thickness can reduce the weight of the final manufactured cookware.

[0071] In some embodiments, the inner surface of the aluminum base has a rough structure with a roughness of 3-6 microns. As an example, the aluminum base is subjected to a pressing treatment so that the aluminum base has a rough structure with a surface roughness of 3-6 microns. Such roughness can improve the bonding force of the first hard layer to further improve the overall bonding force of the non-stick layer thereon.

[0072] Forming a first hard layer

[0073] According to the utility model, the aluminum base can be surface cleaned and treated before plasma spraying of the first hard layer to ensure the adhesion between the first hard layer and the aluminum base, and then the aluminum base is preheated, which can further improve the bonding strength between the first hard layer and the aluminum base.

[0074] According to the utility model, the metal is plasma sprayed to form the first hard layer on the aluminum base. Specifically, the metal titanium particles with a particle size of 80-150 microns are sprayed onto the surface of the aluminum base using high-temperature and high-pressure gas, and then heat treated with a flame heat source to form a dense and uniform titanium metal layer as the first hard layer. Moreover, the titanium metal layer has the advantages of light weight, high strength, high temperature resistance, corrosion resistance, etc.

[0075] According to a specific example, the process parameters of plasma spraying can be: current 80-100A; voltage 60-90V; main gas flow rate 1200-1800L / h; hydrogen flow rate 40-100L / h; powder feeding gas flow rate 400-600L / h; powder feeding amount 50-100g / min; distance between spraying gun nozzle and workpiece 10-15cm; spraying angle 45-80°; and workpiece temperature normal temperature.

[0076] Forming a second hard layer

[0077] According to the utility model, through plasma spraying, the second hard layer is formed on the first hard layer, and specifically, titanium-iron alloy particles with a particle size of 200-250 microns are used to form the second hard layer with good wear resistance. In some embodiments, the process parameters of plasma spraying can be: current 80-100 A; voltage 60-90 V; main gas flow rate 1200-1800 L / h; hydrogen flow rate 40-100 L / h; powder feeding gas flow rate 400-600 L / h; powder feeding amount 50-100 g / min; distance between the spraying gun nozzle and the workpiece 10-15 cm; spraying angle 45-80 degrees; and workpiece temperature normal temperature.

[0078] In some embodiments, the second hard layer is formed of titanium-iron alloy particles, which can be spherical or ellipsoidal particles, so that the second hard layer with uniform pores can be formed by spherical close packing. The particle size of the titanium particles is in the range of 200-250 microns, so that the size range can have good bonding with the first hard layer and form the required pores and pore distribution of the second hard layer.

[0079] In some embodiments, the surface of the second hard layer has a rough structure. As an example, after obtaining the second hard layer, the second hard layer can also be sanded to obtain a second hard layer with a rough surface structure. For the sanded second hard layer, the rough structure of its surface can increase the bonding strength with the nitriding layer, thereby improving the performance of the coating of the entire cookware.

[0080] Forming a magnetically conductive layer, a protective layer

[0081] According to the utility model, the method for manufacturing the cookware further comprises sandblasting the outer surface of the aluminum base to enhance the roughness of the outer surface and provide a better adhesion basis for the subsequent setting of the magnetic conducting layer.

[0082] According to the utility model, the method for manufacturing the cookware further comprises forming a magnetic conducting layer on the outer surface of the aluminum base, specifically, spraying iron wire, cobalt wire or nickel wire to form a magnetic conducting layer on the outer surface of the aluminum base, so that the cookware can be used on an electromagnetic oven.

[0083] In some embodiments, the method for manufacturing the cookware further comprises setting a protective layer outside the magnetic conducting layer, specifically, spraying aluminum wire to set a protective layer outside the magnetic conducting layer. As an example, the thickness of the protective layer can be 0.3-0.5 mm, the diameter of the aluminum wire can be 1.5-2.0 mm, and the spraying method can be arc spraying.

[0084] In these embodiments, the protective layer can prevent the magnetic conducting layer from contacting corrosive media and ensure the service life of the magnetic conducting layer.

[0085] Nitriding treatment

[0086] According to the utility model, the nitrogenization treatment is executed to make the surface layer of the second hard layer include a nitrogenization treatment layer, and a nitrogenization area is formed on the surface layer of the protective layer. Specifically, after the protective layer is formed, the cookware is placed in a nitrogenization furnace, nitrogen is introduced, and a nitrogenization reaction is carried out at a set temperature. During the nitrogenization process, the nitrogen molecules will chemically react with titanium or iron on the surface layer of the second hard layer to generate titanium nitride or iron nitride, thereby forming a nitrogenization treatment layer on the surface layer of the second hard layer, enhancing the corrosion resistance and wear resistance of the internal coating of the cookware to effectively prevent rusting and scratching, and the hardness of the nitrogenization treatment layer is high, which can increase the strength of the product. Moreover, the aluminum layer will form a nitride as the nitrogenization area on the surface layer of the protective layer, thereby enhancing the corrosion resistance and wear resistance of the external coating of the cookware to effectively prevent rusting and scratching, and the hardness of the nitrogenization layer is high, which can increase the strength of the product.

[0087] In some embodiments, the parameters of the nitrogenization treatment include a nitrogenization temperature of 500-550 DEG C, a nitrogenization time of 4-8 h, and a pressure of the nitrogenization furnace of 0.05-0.1 MPa.

[0088] In these embodiments, the surface layers of the second hard layer and the protective layer will form a nitride through the nitrogenization treatment, which is beneficial to improving the corrosion resistance, wear resistance and strength of the cookware.

[0089] Forming an oil film layer

[0090] According to the utility model, the method for manufacturing the cookware further includes filling the oil substance into the porous structure of the non-stick layer.

[0091] In some embodiments, the oil substance can be filled into the porous structure of the non-stick layer through vacuum impregnation treatment, so that the oil substance can be continuously released during subsequent use to better exert the non-stick effect. In addition, the oil substance filled in the porous structure of the non-stick layer can make the pores of the non-stick layer closed, and also can ensure the corrosion resistance of the cookware with the non-stick layer. Specifically, the cookware with the non-stick layer having a porous structure is placed in a high-pressure sealed container, the impregnation liquid completely covers the surface of the non-stick layer, the high-pressure sealed container is closed, and vacuum impregnation treatment is carried out. The specific parameters include a vacuum degree of 90-110 Pa, an impregnation pressure of 0.5-0.7 MPa, an impregnation time of 15-25 min, an impregnation temperature of room temperature, and a spin-drying speed of 180-220 rpm.

[0092] In some embodiments, the oil substance is animal oil, vegetable oil, silicon oil, or polysiloxane.

[0093] According to the present application, the oil substance includes animal oil, vegetable oil, silicon oil, or polysiloxane.

[0094] In some embodiments, the animal oil is solid-liquid convertible animal oil, for example, the solid-liquid convertible animal oil has a freezing point of 15-48℃. For example, the animal oil includes lard, beef tallow, and horse oil. When the temperature is relatively low, the oil substance can be solidified and stably exist in the porous structure, i.e., the oil substance can serve as solid lubricant at low temperature and liquid lubricant at high temperature, thereby reducing the film layer wear rate and prolonging the product service life.

[0095] In some embodiments, the vegetable oil can be used to fill the porous structure of the non-stick layer, wherein the vegetable oil is rapeseed oil, peanut oil, or palm oil.

[0096] In some embodiments, the silicon oil can be selected from at least one of methyl silicon oil, dimethyl silicon oil, hydroxyl silicon oil, hydrogen-containing silicon oil, and polyether-modified silicon oil. The above silicon oil has specific viscosity and surface tension, and is more easily to enter the porous structure. The silicon oil is adsorbed in the porous structure. In addition, the silicon oil includes 20-30% low molecular weight silicon oil, 40-60% medium molecular weight silicon oil, and 20-30% high molecular weight silicon oil by weight percentage, wherein the low molecular weight silicon oil has a molecular weight of 500-1000, the medium molecular weight silicon oil has a molecular weight of 3000-6000, and the high molecular weight silicon oil has a molecular weight of 12000-30000.

[0097] After the silicon oil is selected, the aluminum base with the porous structure is immersed in the silicon oil, so that the silicon oil is combined in the porous structure. For example, the silicon oil can be immersed in the non-stick layer for 2-3 hours at a temperature of 80-100℃.

[0098] In these embodiments, the macromolecular weight silicone oil is more firmly combined with the porous structure, the release speed is slower, the free mobility of the small molecular weight silicone oil is better, thereby having better non-stickiness, and the medium molecular weight silicone oil takes into account the free mobility and the firmness of combination. Therefore, by combining the low molecular weight silicone oil, the medium molecular weight silicone oil and the high molecular weight silicone oil, on the one hand, the amount of silicone oil entering the porous structure is further increased, and sufficient oil supply is ensured, and on the other hand, the silicone oils with different binding forces can be continuously released at each stage of use to exert better non-stick effect. As an example, the binding force between the silicone oil and the aluminum base with the porous structure is about 5MPa-10MPa. With such a binding force, the continuous release of the silicone oil can be ensured, and the silicone oil is prevented from being released too early or not being released.

[0099] After the coating is completed, the cookware filled with the oil-based substance can be sintered in a sintering furnace to solidify, wherein the solidification temperature is 180-200 DEG C, and the solidification time is 1-2 min.

[0100] According to the cookware of the present application, the oil-based substance is filled in the porous structure, and the oil film is penetrated into the pot through high-temperature baking. This process is repeated several times to ensure that the oil film is evenly and firmly attached to the surface of the frying pan. After multiple baking and oil film penetration, the inner surface oil collection treatment is performed, so that the oil film is more closely attached to the surface of the frying pan, forming a smooth and non-stick layer which is not easy to fall off.

[0101] According to the cookware of the present application, not only can it have the advantages of light weight, high corrosion resistance, steel shovel resistance and no organic coating, but also can be used on an electromagnetic oven and can have good non-stick performance.

[0102] 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 includes an aluminum base (10), a first hard layer (20) laminated on the aluminum base (10), and a second hard layer (30) laminated on the first hard layer (20), the porosity of the first hard layer (20) being less than the porosity of the second hard layer (30).

2. The cooker according to claim 1, characterized in that The cookware further includes a magnetic conductive layer (40) formed on the outer surface of the aluminum base (10).

3. The cooker according to claim 2, characterized in that The cookware further includes a protective layer (50) covering the outer side of the magnetic conductive layer (40).

4. The cooker according to claim 3, characterized in that The magnetic conductive layer (40) is a layer of iron, nickel or cobalt; and / or, The protective layer (50) is an aluminum layer including a nitriding region (51).

5. The cooker according to claim 1, characterized in that, The first hard layer (20) has a pore size less than the pore size of the second hard layer (30).

6. The cooker according to claim 1, characterized in that, The second hard layer (30) has a hardness greater than the hardness of the first hard layer (20).

7. The cooker according to claim 1, characterized in that, The first hard layer (20) includes a layer of titanium or iron; and / or, the second hard layer (30) includes a layer of titanium alloy or iron alloy.

8. The cooker according to claim 1, characterized in that, The particle size of the material forming the first hard layer (20) is 80-150 microns; and / or, the particle size of the material forming the second hard layer (30) is 200-250 microns.

9. The cooker according to claim 5, characterized in that, The porosity of the first hard layer (20) is 5-10%; and / or, the porosity of the second hard layer (30) is 10-20%; and / or, the pore size of the first hard layer (20) is 10-20 microns; and / or, the pore size of the second hard layer (30) is 40-50 microns.

10. The cooker according to claim 1, characterized in that, The thickness of the aluminum base (10) is H1, where 2.6mm≤H1≤3.0mm; and / or, The thickness of the first hard layer (20) is H2, where 30 microns≤H2≤150 microns; and / or, The thickness of the second hard layer (30) is H3, where 10 microns≤H3≤30 microns.

11. The cooker according to claim 1, characterized in that, The surface layer of the second hard layer (30) has a nitriding treatment layer (31) with a formation depth of H4, where 5 microns≤H4≤20 microns.

12. The cookware of any one of claims 1 to 11, wherein, The second hard layer (30) has a porous structure filled with an oil-based substance.

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