Method for manufacturing pot and pot

Abstract

The present application provides a method for manufacturing a cookware and the cookware, the method for manufacturing the cookware includes forming a non-stick coating composed of a first material and a second material on a cookware substrate, performing an oxidation treatment on the cookware substrate having the non-stick coating, so that at least a portion of the metal of the first material on the surface of the non-stick coating is oxidized into a metal oxide, and the second material on the surface of the non-stick coating generates a silicon dioxide film having an amorphous phase, the silicon dioxide film having an amorphous phase infiltrates into the metal oxide and forms an amorphous oxide layer with a preset thickness on the surface of the non-stick coating, and the surface of the amorphous oxide layer serves as the inner surface of the cookware. According to the present application, the surface layer of the non-stick coating serving as the inner surface of the cookware is an amorphous oxide layer composed of a metal oxide and having a preset thickness, which can further enhance the visual experience of the cookware during use.

Description

Technical Field

[0001] The present application relates to the field of cookware, and in particular, to a method for manufacturing a cookware and the cookware. Background Art

[0002] The coating-free non-stick technology can be used to prepare the coating of the cookware through single metal or alloy, which has certain advantages in the field of cookware manufacturing. For example, the material for preparing the coating is a single metal or alloy that meets food hygiene standards, and no organic coating is used in the preparation process, so the safety of the prepared cookware is highly recognized.

[0003] Although the non-coating non-stick technology has certain advantages, the non-stick effect of the coating formed by the non-coating non-stick technology is general and difficult to adapt to the needs of users. Therefore, improving the non-stick property of cookware is extremely important in an era of fierce product competition. In addition, the existing single metal or alloy materials that meet food hygiene standards and can be used for non-coating technology are all light-colored, such as silver white, etc. The coating of the cookware is easily discolored due to oxidation or due to dirt adsorbed in gaps or depressions during use (for example, burnt food dirt, etc.), which makes the visual experience of the cookware during use poor. Summary of the invention

[0004] Therefore, the purpose of the present application is to provide a method for manufacturing a cookware and a cookware, so as to solve the problem of discoloration of the cookware during use and the problem of poor non-stickiness of the cookware in the prior art.

[0005] According to a first aspect of the present application, a method for manufacturing cookware is provided, wherein the method for manufacturing cookware comprises: forming a non-stick coating composed of a first material and a second material on a cookware substrate, wherein the first material is a metal element or an alloy, and the second material is metal silicon powder; performing a high-temperature oxidation treatment on the cookware substrate having the non-stick coating, so that at least a portion of the metal of the first material on the surface of the non-stick coating is oxidized into metal oxide, and the second material generates a silicon dioxide film with an amorphous phase, the silicon dioxide film with an amorphous phase penetrates into the metal oxide and forms an amorphous oxide layer with a preset thickness on the surface of the non-stick coating, and the surface of the amorphous oxide layer serves as the inner surface of the cookware.

[0006] In an embodiment, the step of performing high-temperature oxidation treatment on the cookware substrate having the non-stick coating comprises: placing the cookware substrate having the non-stick coating in an oxygen-free environment and then heating it to a predetermined temperature; then adding distilled water at a predetermined rate, wherein the distilled water can be vaporized into water vapor at the predetermined temperature, thereby placing the non-stick coating in a water vapor environment and maintaining it for a preset time.

[0007] In an embodiment, the step of forming a non-stick coating composed of a first material and a second material on a cookware substrate comprises: mixing the first material and the second material to form a composite material; spraying the composite material on the cookware substrate to obtain a non-stick coating composed of an alternating distribution of the first material and the second material.

[0008] In an embodiment, based on the total weight of the composite material being 100%, the weight of the first material accounts for 55%-75% of the total weight of the composite material, and the remainder is the second material.

[0009] In an embodiment, the non-stick coating is a thermal spray coating having a rough structure on the surface, the alloy is an amorphous alloy, and the thermal spray coating includes core particles having an amorphous structure and outer coating particles having a crystalline structure located on the surface of the core particles, and the crystalline structure of the outer coating particles can be transformed into an amorphous structure after high-temperature oxidation treatment.

[0010] In an embodiment, the alloy includes at least one of a binary amorphous alloy, a ternary amorphous alloy and a high entropy amorphous alloy; and the metal element includes at least one of Ti, Fe, Y and Zr.

[0011] In an embodiment, the binary amorphous alloy includes two main metal elements whose atomic percentages are more than 90% and the balance of secondary non-metal elements, with the total atomic percentage being 100%, and the atomic percentage of any one of the two main metal elements is more than 10%, wherein the two main metal elements include two of Mg, Al, Ca, Ti, Fe, Zn, Ga, Ge, Y, Zr and Sn, and the secondary non-metal elements include at least one of C, N, O, B, S and P.

[0012] In an embodiment, the method for manufacturing the cookware further comprises: before the step of forming the non-stick coating, forming a transition layer on the surface of the cookware substrate using a corrosion-resistant material, wherein the non-stick coating is formed on the surface of the transition layer.

[0013] In an embodiment, the corrosion-resistant material is at least one of aluminum oxide, titanium oxide, zirconium oxide and titanium suboxide.

[0014] According to a second aspect of the present application, a cookware is provided, wherein the cookware comprises a cookware substrate and a coating formed on the surface of the cookware substrate, the surface layer of the coating comprises an amorphous oxide layer of a preset thickness, the amorphous oxide layer is formed of at least a metal oxide, and the metal oxide is formed by high-temperature oxidation of a composite material, wherein the composite material comprises a first material and a second material, the first material is a metal element or an alloy, and the second material is metal silicon powder.

[0015] In an embodiment, the cookware substrate includes an aluminum substrate, an iron substrate, a magnesium substrate, a stainless steel substrate or a titanium substrate, and a composite substrate formed by the above substrates. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or other features and aspects of the present invention will become clear and easily understood through the description of the embodiments in conjunction with the accompanying drawings.

[0017] Figure 1 The XRD pattern of the non-stick coating having an amorphous oxide layer on the surface according to an embodiment of the present application is shown.

[0018] Figure 2 A schematic diagram of a cooker according to an embodiment of the present application is shown.

[0019] Figure 3 Shows Figure 2 A local enlarged schematic diagram of the . DETAILED DESCRIPTION

[0020] The specific implementation methods of the present application are described in detail below. Although some embodiments have been shown and described, those skilled in the art should understand that these embodiments can be modified and improved without departing from the principles and spirit of the present application whose scope is defined by the claims and their equivalents.

[0021] In the coating-free non-stick technology, the coating formed on the cookware is mostly light-colored, for example, silver-white. During the use of the cookware, the surface is easily oxidized and discolored, or the gaps in the cookware are easy to accumulate dirt (for example, burnt food and dirt), which makes the visual experience of the cookware poor.

[0022] The applicant has found that by mixing at least one of a metal element or alloy with metal silicon powder to form a mixture, the mixture is used to manufacture a non-stick coating on the inner surface of the cookware substrate, and then the cookware substrate with the non-stick coating is subjected to a high-temperature oxidation treatment, so that an amorphous oxide layer with a preset thickness is formed on the surface of the non-stick coating (i.e., from the outside to the inside of the coating surface), the visual use experience of the cookware can be improved. In detail, by using the surface of the amorphous oxide layer as the inner surface of the cookware, since the metal oxide forming the amorphous oxide layer has a relatively darker color than the corresponding metal material and has a stable texture, it is not easy to change color during use, and the darker color can hide some of the use defects (non-functional defects), thereby improving the visual use experience of the cookware. In addition, the applicant has found that when the oxide layer has an amorphous structure, the amorphous oxide layer has a lower surface energy than the crystalline oxide layer or the coating formed by the corresponding metal material, thereby improving the non-stickiness of the coating formed thereby. When the non-stick properties are good, the pores and depressions on the surface are not easy to hide dirt, which can further enhance the visual experience of the cookware.

[0023] According to a first aspect of the present application, a method for manufacturing cookware is provided, wherein the method for manufacturing cookware includes forming a non-stick coating composed of a first material and a second material on a cookware substrate; performing a high-temperature oxidation treatment on the cookware substrate having the non-stick coating, so that at least a portion of the metal of the first material on the surface layer of the non-stick coating is oxidized into a metal oxide, and the second material generates a silicon dioxide film having an amorphous phase, the silicon dioxide film having an amorphous phase penetrates into the metal oxide and forms an amorphous oxide layer having a preset thickness on the surface layer of the non-stick coating, and the surface of the amorphous oxide layer serves as the inner surface of the cookware, wherein the first material is a metal element or an alloy, and the second material is metal silicon powder.

[0024] In the embodiment of the present application, the inner surface of the cookware is the surface of the cookware that contacts the food during use, and the surface opposite to the inner surface is the outer surface of the cookware. During the high-temperature oxidation process, the outer surface of the cookware base will also undergo a certain reaction, so that the non-stick properties of the inner and outer surfaces of the cookware can be improved to avoid dirt and grime. At the same time, the hardness and wear resistance of the cookware can also be improved.

[0025] It should be noted that compared with a coating formed by spraying a metal oxide (e.g., titanium dioxide) directly on the surface of a substrate, the surface layer with an amorphous oxide layer formed by a metal oxide obtained in the present application can greatly improve the non-stick properties of the cookware due to the amorphous oxide layer on the surface.

[0026] According to the present application, different oxidation depths will cause the cookware to present different colors. Therefore, the present application can not only obtain the inner surface of the cookware of the expected color due to the thickness of the oxidation, but also improve the non-stickiness of the cookware by forming an amorphous oxide layer, thereby making the cookware more competitive.

[0027] Figure 1 The non-stick coating is formed by using a binary titanium-iron amorphous alloy and metal silicon powder. After high-temperature oxidation treatment, the metal iron on the surface of the non-stick coating will be preferentially oxidized into metal oxides, and the metal silicon powder will also be oxidized into a silicon dioxide film under the influence of high temperature. The silicon dioxide film penetrates into the metal oxide and together forms the amorphous oxide layer of the present application. Figure 1 As shown, the characteristic peaks are not particularly obvious, the impurity peaks are numerous and disordered, the crystallinity is poor, the oxide layer has obvious amorphous bulges, and the oxide layer shows an amorphous trend. According to the conventional full spectrum fitting method, the amorphous phase content is calculated to be 88%.

[0028] In the prior art, coatings formed by metal elements or common alloys generally do not have amorphous properties or have a low amorphous content. Therefore, in some embodiments of the present application, the amorphous content of the oxide layer formed by a mixture of metal silicon powder and at least one of a metal element and a common alloy is not less than 65%. Amorphous alloy materials may have different amorphous properties due to different materials, but the amorphous phase usually reaches a limit easily, and the amorphous content is difficult to increase. In some embodiments of the present application, the amorphous content of the oxide layer formed by a mixture of amorphous alloys and metal silicon powder can be increased by at least 3%. It can be seen that according to the non-stick coating after oxidation treatment of the present application, the non-stick coating without amorphous phase can be made amorphous, and the amorphous content of the non-stick coating with amorphous properties can be further increased.

[0029] Provide the base of the pot

[0030] According to the present application, the cookware substrate can be made of a substrate for making cookware in the prior art. In an embodiment, the method for making a cookware includes the step of providing a cookware substrate. Specifically, the step of providing a cookware substrate includes preparing a substrate, stretching the substrate into the shape of the cookware, and performing alkaline washing, degreasing, drying, and other operations on the surface of the cookware to avoid affecting the bonding force between the subsequent coating and the cookware substrate.

[0031] In some embodiments, the cookware substrate may include a stainless steel substrate, a titanium substrate, and a composite substrate with the inner and outer surfaces thereof. The composite substrate may include a titanium-aluminum-stainless steel three-layer composite substrate. The materials forming the inner and outer surfaces of these substrates have certain corrosion resistance and are therefore not prone to corrosion.

[0032] In order to reduce the weight of the cookware, in other embodiments, the cookware substrate includes one of an aluminum substrate, a magnesium substrate, an iron substrate, and a composite substrate formed by at least two metals of aluminum, magnesium, and iron. In an exemplary embodiment, the composite substrate includes, for example, an iron-aluminum-iron three-layer composite substrate and an iron-aluminum two-layer composite substrate. Because the materials forming these substrates are lighter than stainless steel or titanium, the weight of the cookware can be reduced to a great extent.

[0033] Since aluminum, magnesium and iron are all materials that are easily oxidized, corrosion is likely to occur when the base of the cookware is formed of such materials, which limits the materials used to manufacture the cookware. To this end, according to some embodiments of the present application, the method for manufacturing the cookware further includes forming a transition layer on the surface of the cookware base using a corrosion-resistant material before forming the non-stick coating, and forming the non-stick coating on the surface of the transition layer. According to the present application, the method for manufacturing the cookware can be suitable for a wider variety of bases, thereby expanding the range of base materials that can be adapted to the manufacture of the cookware, and having better versatility.

[0034] According to the present application, the corrosion-resistant material is a ceramic material, specifically a ceramic material with a quasi-spherical appearance. The structure of the coating formed by plasma spraying of the quasi-spherical ceramic material is higher in density than the coating formed by the metal material, which can prevent the corrosive medium from penetrating into the base of the cookware and causing corrosion. In addition, the ceramic material has good corrosion resistance of the material itself, and the surface basically does not corrode, so the ceramic material can be used as a material to inhibit the rust of the base of the cookware. In the present application, the quasi-spherical shape means that the ceramic material has a smooth surface with an arc-shaped transition, specifically, it can be spherical or elliptical. However, the present application does not necessarily limit it to a quasi-spherical structure.

[0035] In an embodiment, the ceramic material may include at least one of aluminum oxide, titanium oxide, zirconium oxide and titanium suboxide. The above materials are low in cost, easy to purchase, and have good corrosion resistance.

[0036] In an embodiment, the particle size of the corrosion-resistant material may be 10-50 μm. If the particle size of the corrosion-resistant material is greater than 50 μm, the pores of the formed transition layer may be too large due to the large material particles, thereby weakening the corrosion resistance, and the particles are too large, resulting in a high probability of rebound after hitting the surface of the substrate, thereby reducing the deposition efficiency of the material and wasting raw materials; if the particle size of the corrosion-resistant material is less than 10 μm, the particles may be too small, resulting in construction difficulties during the plasma spraying process (for example, uneven powder feeding due to poor powder fluidity; insufficient flight speed due to the powder being too small and too light, reducing deposition efficiency and wasting raw materials).

[0037] In the embodiment, the thickness of the transition layer can be 20-100 μm, which can have good corrosion resistance and does not affect the bonding force between the non-stick coating and the cookware substrate. If the thickness of the transition layer is greater than 100 μm, the overall stress of the cookware coating may be too large due to the excessive thickness, thereby affecting the bonding force between the non-stick coating and the cookware substrate, and the non-stick coating may crack and fall off or crack and fall off due to mechanical shock and thermal shock during use; if the thickness of the transition layer is less than 20 μm, the cookware substrate may not be completely covered due to the excessive thickness, leaving gap defects, affecting the final corrosion resistance effect.

[0038] Preparing composite materials

[0039] According to the present application, the step of forming a non-stick coating including a first material and a second material on a cookware substrate includes providing a composite material formed by mixing the first material and the second material, and spraying the composite material on the cookware substrate, thereby providing a non-stick coating formed by the first material and the second material on the cookware substrate.

[0040] Due to the requirements of food hygiene standards, the materials suitable for forming coatings through non-coating non-stick technology are quite limited, and are generally common metals or alloys.

[0041] In an embodiment, the composite material is a mixture of a first material and a second material, the first material is a metal element or an alloy, and the second material is metal silicon powder. In an exemplary embodiment, the metal element includes at least one of Ti (titanium), Fe (iron), Y (yttrium) and Zr (zirconium), and itself is a crystalline structure. The alloy includes a common alloy or an amorphous alloy, wherein the common alloy may include at least one metal of Mg, Al, Ca, Ti, Fe, Zn, Ga, Ge, Y, Zr and Sn. Exemplarily, the common alloy may be at least one of an iron alloy (titanium-iron alloy, zirconium-iron alloy, silicon-iron alloy or iron-niobium alloy, etc.), a titanium alloy (TA series, TB series, TC series) and a zirconium alloy (zirconium-tin alloy, zirconium-titanium alloy, etc.), which itself is a crystalline structure. The amorphous alloy includes at least one of a binary amorphous alloy, a ternary amorphous alloy and a high entropy amorphous alloy, which has an amorphous structure.

[0042] According to the present application, the binary alloy includes two main metal elements and a secondary non-metal element, the two main metal elements include two of Mg, Al, Ca, Ti, Fe, Zn, Ga, Ge, Y, Zr and Sn, and the secondary non-metal element includes at least one of C, N, O, B, S and P. Wherein, based on the total atomic percentage of 100%, the binary amorphous alloy includes two main metal elements with an atomic percentage of more than 90% and the remainder of the secondary non-metal element, and the atomic percentage of any one of the two main metal elements is more than 10%. Exemplarily, the binary alloy includes Mg 20 Al 70 P2C4N4、Ti 60 Ga 35 C1N1O2P1、Al 80 Zr 10 C2B2S4P2 and Ge 40 Y 50 C2N1O2B2S2P1. The above-mentioned metal single substance or elements in the alloy can be easily oxidized, and the generated metal oxide has a darker color and stable properties, and is not easy to change due to use (for example, color, structure, etc.). In addition, the generated metal oxide has a certain hardness and wear resistance, thereby improving the service life of the cookware.

[0043] In these embodiments, the main metal elements of the binary amorphous alloy are relatively active, so that during the oxidation process, oxygen atoms react with some of the relatively active metal atoms therein and precipitate in the form of metal oxides. The relatively active metal atoms therein migrate to produce defects such as holes, which causes changes in the forces between the remaining metal atoms, thereby increasing the degree of lattice distortion and the degree of amorphization.

[0044] According to the present application, the greater the difference in atomic radius between the main metal elements of the binary alloy, the easier it is for lattice distortion to occur, and the higher the degree of amorphization of the obtained alloy material, and the lower the surface energy. In an exemplary embodiment, the difference in electronegativity between the main metal elements of the binary alloy is greater than 0.2. And in the same binary amorphous alloy, more than 4 impurity elements can be selected. The more types of impurity elements, the more chaotic the lattice, and the more likely it is to form an amorphous structure.

[0045] In an embodiment, the second material is metal silicon powder. The main component of metal silicon powder is crystalline silicon, which is a powder formed after grinding crystalline silicon. It is black in color and has low activity, but can generate an amorphous silicon dioxide film under the high temperature oxidation environment of the present application. The silicon dioxide film is relatively dense and its chemical properties are stable, so that the non-stickiness and corrosion resistance of the coating on the inner surface of the pot can be significantly improved. It should be noted here that metal silicon powder is different from silicon powder. Silicon powder is called silicon ash powder, which is the smoke recovered from the production process of metal silicon or ferroalloy. The main component is silicon dioxide, which has volcanic ash activity, and the color of silicon powder is changeable, which will change from white to black.

[0046] In an embodiment, the composite material is a mixture of a first material and a second material. The first material and the second material may be mixed mechanically to form a mixture, or the first material and the second material may be mixed by granulation to form a mixture. According to the present application, the desired appearance and good non-stickiness can be obtained by mechanical mixing, so compared with the granulation mixing form, the manufacturing process steps can be simplified and the production cost can be reduced.

[0047] In an embodiment, based on the total weight of the composite material being 100%, the weight of the first material accounts for 55%-75% of the total weight of the composite material, and the remainder is the second material.

[0048] According to the present application, the shape of the first material can be specifically set according to actual needs. For example, the shape of the first material can be spherical or irregular. As far as the first material is a metal element, the cost of an irregularly shaped metal element is relatively lower than that of a spherical metal element, and its cost is generally one tenth of the cost of a spherical metal element. Therefore, in order to save costs, the metal element according to the present application can be a metal element with an irregular structure.

[0049] In an embodiment, the particle size of the first material is 200-500 mesh, and the particle size of the second material is 200-400 mesh. The particle size of the composite material is 200-500 mesh, preferably 300-400 mesh. If the particle size of the composite material is greater than 200 mesh, the powder feeding pipe may be blocked due to the large particles, and the large particles may cause insufficient melting of the particles, and there is a high probability of rebound after hitting the surface of the substrate, thereby reducing the deposition efficiency and wasting raw materials; if the particle size of the composite material is less than 500 mesh, the particles may be too small, which may cause construction difficulties in thermal spraying processes such as plasma spraying (for example, uneven powder feeding due to poor powder fluidity; insufficient flight speed due to too small powder and too light weight, reducing deposition efficiency, wasting raw materials, and easily causing powder overmelting and oxidation to ash).

[0050] Creates a non-stick coating

[0051] According to the present application, the non-stick coating of the present application can be formed on the cookware substrate by using the existing layer forming process, for example, thermal spraying can be used. Thermal spraying can form a non-stick coating with a certain rough structure on the surface, and thermal spraying can improve the bonding force between the coating and the cookware substrate, thereby improving the service life of the cookware.

[0052] In an embodiment, the step of forming a non-stick coating composed of a first material and a second material on a cookware substrate includes mixing the first material and the second material to form a composite material, spraying the composite material on the cookware substrate, thereby obtaining a non-stick coating composed of an alternating distribution of the first material and the second material, wherein the first material is at least one of a metal element and an alloy, and the second material is metal silicon powder.

[0053] In the embodiment, the non-stick coating is a thermal spray coating with a rough structure formed by plasma spraying. According to the present application, the thermal spray coating can be made to have a certain degree of amorphousness in advance, so that the amorphous proportion of the cookware coating can be further increased by high-temperature oxidation. Of course, the present application does not impose too many restrictions on this. When the thermal spray coating does not have non-stick properties, the oxide layer formed by high-temperature oxidation can also have an amorphous structure due to lattice distortion.

[0054] In an embodiment, the thermal spray coating is made to have a certain degree of amorphousness. Specifically, the plasma spraying method includes the following steps.

[0055] Step S101, placing the side of the cookware opposite to the sprayed side (ie, the outer surface of the cookware) in a circulating cooling air environment, wherein the temperature of the cooling air is between -20°C and -10°C.

[0056] Step S102, loading 200-500 mesh metal material powder into the powder feeder, and setting the parameters of the plasma spraying process. The specific parameters of the plasma spraying process are: arc current: 300-600A; voltage: 40-75V; main gas (argon) flow: 1000-2000L / h; hydrogen flow: 40-150L / h; powder feeding gas flow: 300-600L / h; powder feeding speed: 30-80g / min; spraying (gun nozzle to workpiece distance) distance: 10-15cm; spraying angle: 45-80°. Under the above parameters, the high-pressure plasma flame flow formed at the muzzle heats the surface of the metal material to micro-melting, and then rapidly cools at a cooling rate of 20-80K / S and deposits on the inner surface of the pot, thereby forming a non-stick coating with a rough structure.

[0057] In some embodiments, the cookware is placed in a low temperature environment, for example, between -20°C and -10°C, and the non-stick coating formed by plasma spraying a composite material of at least one of a common alloy and a metal element and metal silicon powder is a non-stick coating composed of a certain amorphous proportion of metal or common alloy. The composite material of amorphous alloy material and metal silicon powder is slightly melted on the surface by plasma spraying while the inside remains unchanged, so that when sprayed on the substrate, a core particle with an amorphous structure and an outer coating particle with a crystal structure located on the surface of the core particle are formed, and the crystal structure of the outer coating particle can be transformed into an amorphous structure after high-temperature oxidation treatment.

[0058] In other embodiments, a composite material of at least one of a common alloy and a metal element and metal silicon powder is used to form a non-stick coating with a crystalline structure by plasma spraying. The composite material of an amorphous alloy material and metal silicon powder is used to slightly melt on the surface while the inside remains unchanged by plasma spraying, so that when sprayed on a substrate, a core particle with an amorphous structure and an outer coating particle with a crystalline structure located on the surface of the core particle are formed, and the crystal structure of the outer coating particle can be transformed into an amorphous structure after high-temperature oxidation treatment.

[0059] It should be noted that when the cookware is placed in a low temperature environment, the surface of the particles melts at a relatively high temperature and quickly cools and deposits on the surface of the cookware substrate, so the particles do not have time to form a complete crystal structure, and thus tend to form an amorphous structure. Although the amorphous ratio can be increased or converted into an amorphous structure, the amorphous property of the obtained coating is still poor and has a limit value. For this reason, it can also be explained to a certain extent that the present application can make the amorphous property meet the non-stick requirements through post-oxidation treatment, increase the amorphous ratio or make the coating amorphous, thereby making the non-stick and stain resistance of the cookware better.

[0060] According to the present application, the metal in the amorphous alloy includes at least Mg, Al, Ca, Ti, Fe, Zn, Ga, Ge, Y, Zr or Sn, which are metals that are easily oxidized at high temperatures, and the generated metal oxides have a darker color and are stable and not easy to change, thereby ensuring that the color of the cookware does not change due to use. The amorphous alloy material is formed by at least one active metal among Mg, Al, Ca, Ti, Fe, Zn, Ga, Ge, Y, Zr and Sn and other metals, and the amorphous alloy material is used to form a non-stick coating by thermal spraying. The obtained non-stick coating is a thermal spray coating with a rough surface structure. The thermal spray coating includes core particles with an amorphous structure and outer coating particles with a crystal structure located on the surface of the core particles. Under the action of high-temperature oxidation, the crystal structure of the outer coating particles on the surface of the non-stick coating can be transformed into an amorphous structure, thereby improving the non-stick performance of the cookware due to the increase in the proportion of amorphous. It should be noted that when the material forming the non-stick coating is a metal element or alloy, when the non-stick coating obtained is a crystalline structure, under the action of high-temperature oxidation, the crystalline structure of the surface layer of the non-stick coating can be transformed into an amorphous structure, and when the non-stick coating obtained has a certain amorphous structure, under the action of high-temperature oxidation, the amorphous ratio of the surface layer of the non-stick coating can be greatly increased. In other words, according to the post-oxidation treatment of the present application, the non-stick coating without an amorphous phase can be made amorphous, and the non-stick coating with amorphous properties can have a higher amorphous ratio.

[0061] In the embodiment, the thickness of the non-stick coating is 40-100 μm. If the thickness of the non-stick coating is greater than 100 μm, the stress of the overall thermal spray coating may be too large due to the thickness, thereby affecting the bonding force between the non-stick coating and the cookware substrate, and the coating may crack and fall off, or crack and fall off due to mechanical shock and thermal shock during use, which may also cause excessive surface roughness, resulting in difficulties in subsequent processing and cost waste; if the thickness of the non-stick coating is less than 40 μm, the coating may be too thin to completely cover the bottom layer, or the non-stick layer may be partially exposed during the subsequent sanding and oxidation process, exposing the bottom layer, affecting the non-stick effect.

[0062] High temperature oxidation treatment of non-stick coating

[0063] In some embodiments, the high-temperature oxidation treatment may be high-temperature water vapor oxidation. Specifically, the step of performing high-temperature oxidation treatment on the cookware substrate with a non-stick coating includes placing the cookware substrate with a non-stick coating in an oxygen-free environment and then heating it to a predetermined temperature, and then adding distilled water to the environment at a predetermined rate. The distilled water can be vaporized into water vapor at a predetermined temperature, so that the non-stick coating is in an oxygen-free or low-oxygen water vapor environment and maintained for a preset time. By placing the cookware substrate with a non-stick coating in a water vapor environment formed by distilled water for a preset time, an amorphous oxide layer with a preset depth is formed on the surface of the non-stick coating. In other embodiments, supersonic flame oxidation, pulsed plasma oxidation or laser oxidation can be used instead of high-temperature water vapor oxidation, and this application will not be described in detail.

[0064] In an embodiment, the predetermined temperature is 450° C.-850° C., the predetermined rate is 30-150 mL / min, and the preset time is 3 h-6 h.

[0065] According to the present application, the step of high temperature oxidation treatment includes at least an exhaust stage, and the exhaust stage can specifically include placing the pot in a closed high temperature furnace, introducing nitrogen, and at the same time setting the temperature of the closed high temperature furnace to 130°C-150°C, and maintaining it for 10min-30min, so as to remove the air in the closed high temperature furnace until the air content in the closed high temperature furnace is less than 1%. The interior of the closed high temperature furnace is controlled in a low oxygen or oxygen-free environment, and then the temperature is raised to a preset temperature, so as to avoid the surface of the non-stick coating being oxidized by air, so that it is not easy to oxidize later and obtain an oxide layer with a preset depth on the surface. Among them, the oxidation stage can specifically include raising the temperature of the closed high temperature furnace to a predetermined temperature between 450°C-850°C at a heating rate of 10-20°C / min, and then dripping distilled water at a rate of 30-150mL / min, maintaining the preset time for 3h-6h, and finally stopping dripping and heating, and cooling naturally to room temperature with the furnace, so as to obtain an oxide layer with an amorphous structure. It should be noted that in order to make the process as oxygen-free as possible, deoxygenated distilled water can be used as distilled water. During the water addition process, the excess gas in the closed high-temperature furnace can be discharged to the outside through the conduit under the pressure caused by the high temperature, thereby achieving continuous water addition and exhaust. Therefore, the high-temperature furnace is always in a balanced water vapor environment, which is equivalent to immersing the pot in a water vapor environment to oxidize it.

[0066] In these embodiments, by placing the cookware substrate with a non-stick coating in an oxygen-free or low-oxygen environment and then heating it to a predetermined temperature, the cookware can be prevented from being oxidized in the air to form an oxide film, thereby preventing the subsequent water vapor oxidation from proceeding. By placing the cookware substrate with a non-stick coating in a water vapor environment formed by distilled water for a preset time, the non-stick coating can be oxidized in the water vapor environment, and an amorphous oxide layer of a preset depth can be obtained due to the fast oxidation speed and strong oxidizing property of water vapor. Therefore, compared with the air oxidation method, the high-temperature oxidation step of the present application can oxidize quickly and make the oxidation depth deeper, so that the expected color can be obtained.

[0067] According to the present application, the composite material contains active metals, so water vapor will spontaneously undergo oxidation reaction with the active metals at high temperatures to generate metal oxides with better stability. The principle refers to the chemical reaction of metals and water, such as 3Fe+4H2O=Fe3O4+4H2, Ti+2H2O=TiO2+2H2. The composite material also includes metal silicon powder, which will also react with water vapor to generate orthosilicic acid. The principle refers to the chemical reaction of metal silicon powder and water, Si+4H2O=H4SiO4+2H2. High-temperature dehydration of orthosilicic acid will generate an amorphous silicon dioxide film layer, which can not only improve the non-stickiness due to the increase in the proportion of amorphous materials, but also have corrosion resistance due to the compactness of silicon dioxide. For the specific reaction principle, refer to the high-temperature dehydration reaction of orthosilicic acid H4SiO4=SiO2+2H2O.

[0068] According to the present application, plasma spraying does not completely melt the first material. Taking amorphous alloy materials as an example, under the influence of plasma flame flow, the surface of the amorphous alloy material will be slightly melted while the inside remains unchanged, and then hit the surface of the cookware substrate to form a non-stick coating. Subsequently, the slightly melted metal on the surface of the amorphous alloy will recrystallize and precipitate crystals, thereby causing the surface of the formed thermal spray coating to be transformed into a crystalline structure. Since the thermal spray coating presents irregular particles and is a layered structure, the surface not only has a concave-convex structure, but also has some defects such as pores. Therefore, the surface of the thermal spray coating can be sanded to remove such defects. And in the process of sanding, the crystals of the convex part of the concave-convex structure can be partially removed, so that the proportion of amorphous phase in the non-stick coating is increased. It should be noted that at this time, the surface part of the thermal spray coating is still mostly a crystalline structure, for example, the concave part and the pores on the surface. This part belongs to the area that sanding cannot reach, so it cannot be completely removed even by sanding. To this end, according to the present application, by subjecting the pot substrate with a non-stick coating to a high-temperature oxidation treatment, in a high-temperature oxidation environment, oxygen atoms can penetrate into the metal lattice of the crystal structure of the surface layer, and the oxygen atoms react with a portion of the active metal to generate a metal oxide (having a MO ionic bond, where M refers to a metal element). Due to the presence of the MO ionic bond, the equilibrium state of the original bond is destroyed, resulting in the appearance of defects such as holes, resulting in lattice distortion, thereby increasing the degree of amorphization of the obtained coating, and thus the non-stick coating surface layer is generated with a preset depth and an amorphous oxide layer, which can increase the amorphous proportion of the inner surface of the pot with the coating, has a lower surface energy, and the metal oxide has a certain hardness and wear resistance. In addition, the metal silicon powder as the second material will also form an amorphous silicon dioxide film during the high-temperature oxidation process, and as part of the oxide layer of the surface layer of the non-stick coating, because it is more dense, the pores are reduced, thereby improving the corrosion resistance. In an embodiment, the oxide layer has a staggered silicon dioxide film and a metal oxide, and has an amorphous structure and low surface energy. It can be seen that the cookware of the present application not only has excellent non-stick properties, but also has excellent wear resistance and corrosion resistance.

[0069] In the embodiment, the thickness of the oxide layer is 10 μm-20 μm. If the thickness of the oxide layer is greater than 20 μm, a higher temperature and a longer time are required, which may reduce the strength of the oxide layer and may cause damage to the substrate (for example, the aluminum substrate melts and deforms, and the outer surface of the stainless steel substrate is severely rusted due to oxidation, etc.); if the thickness of the oxide layer is less than 10 μm, it may be easy to wear and disappear during later use due to the thin thickness, and the durability effect is poor.

[0070] In the embodiment, the oxide film changes the metallic color of the metal itself (e.g., titanium dioxide is dark, and ferroferric oxide is black), achieving the effect of deepening the color and resisting dirt and discoloration. In addition, the oxide layer has a certain hardness and a preset thickness, so it can be shovel-resistant and durable. Since the surface of the oxide layer is a rough surface formed by plasma spraying, the depressions of the oxide film with a rough structure are not easily damaged by shoveling.

[0071] According to a second aspect of the present application, a cookware is provided, wherein the cookware is manufactured using the method for manufacturing the cookware provided in each of the above embodiments.

[0072] In an embodiment, the cookware includes a cookware base 100 and a coating 200 located on the surface of the cookware base. Figure 2 and Figure 3 As shown, the coating 200 on the surface of the cookware substrate includes an initial non-stick coating 210 and an oxide layer 220 located on the surface of the initial non-stick coating 210. The oxide layer 220 is generated from the outside to the inside on the surface of the non-stick coating 210 with a preset thickness and has an amorphous phase, so that the non-stick coating is divided into the initial non-stick coating 210 and the oxide layer 220 located on the surface of the initial non-stick coating 210.

[0073] According to the present application, the surface layer of the cookware coating includes an amorphous oxide layer of a preset thickness, and the amorphous oxide layer is formed by at least a metal oxide, wherein the metal oxide is formed by high-temperature oxidation of a composite material, and the composite material includes a first material and a second material, the first material is a metal element or an alloy, and the second material is metal silicon powder.

[0074] According to the present application, the amorphous oxide layer has excellent non-stickiness, high density and hardness, and good corrosion resistance. In the embodiment, the amorphous oxide layer is a mixed layer formed by the amorphous silicon dioxide film layer and the amorphous metal oxide. The oxide layer generated by high-temperature oxidation leaves holes due to the migration of metal atoms, and the metal oxides of different valence states are mixed, resulting in lattice distortion and a certain degree of amorphization.

[0075] In the embodiment, the oxide film changes the metallic color of the metal itself (e.g., titanium dioxide is dark, and ferroferric oxide is black), achieving the effect of deepening the color and resisting dirt and discoloration. In addition, the oxide layer has a certain hardness and a preset thickness, so it can be shovel-resistant and durable. Since the surface of the oxide layer is a rough surface formed by plasma spraying, the depressions of the oxide film with a rough structure are not easily damaged by shoveling.

[0076] In an embodiment, the cookware substrate includes one of an aluminum substrate, an iron substrate, a magnesium substrate, a stainless steel substrate or a titanium substrate, and a composite substrate formed by the above substrates.

[0077] The present application will be described in detail below in conjunction with embodiments, but the protection scope of the present application is not limited to the embodiments.

[0078] Example 1

[0079] The non-stick material according to Example 1 was prepared by the following method.

[0080] Step S10, providing a stainless steel cookware base with a thickness of 1.8 mm.

[0081] Step S20, providing a composite material. Provide titanium powder with an average particle size of 300 mesh as a first material, and metal silicon powder with an average particle size of 300 mesh as a second material, and mix the first material and the second material at a mass ratio of 7:3 to obtain a composite material with an average particle size of 300 mesh.

[0082] Step S30, preparing a non-stick coating.

[0083] Step S31, placing the outer surface of the cookware in a circulating cooling air environment, and the temperature of the cooling air is set at -10°C.

[0084] Step S32, placing the composite material in a powder feeder of a plasma spraying device, and setting the parameters of the plasma spraying device as follows: arc current: 550A; voltage: 55V; main gas (argon) flow: 1500L / h; hydrogen flow: 100L / h; powder feeding gas flow: 400L / h; powder feeding speed: 50g / min; spraying (distance from the gun nozzle to the workpiece) distance: 12cm; spraying angle: 60°. Under the above parameters, the high-pressure plasma flame flow formed at the gun muzzle heats the surface of the composite material to melt, and then deposits it on the surface of the cookware substrate to form a non-stick coating with a thickness of 60μm on the cookware substrate.

[0085] Step S40, forming an amorphous oxide layer with a preset depth on the surface of the non-stick coating.

[0086] The formed pot with non-stick coating is subjected to high-temperature oxidation treatment. Specifically, the pot substrate is placed in a closed high-temperature furnace, nitrogen is introduced, and the temperature of the closed high-temperature furnace is set at 140°C for 20 minutes, thereby removing the air in the closed high-temperature furnace until the air content in the closed high-temperature furnace is less than 1%. The interior of the closed high-temperature furnace is controlled in a low-oxygen environment, and then the temperature is increased to 650°C at a heating rate of 15°C / min, and then distilled water is dripped at a rate of 3L / min, and maintained for 4 hours. Finally, the dripping of distilled water and heating are stopped, and the furnace is naturally cooled to room temperature, and the pot is taken out, thereby obtaining a pot with an amorphous oxide layer with a thickness of 15μm.

[0087] Example 2

[0088] The cookware of Example 2 was prepared by the same method as that of Example 1, except that the titanium powder as the first material was replaced by an iron-niobium alloy.

[0089] Example 3

[0090] In addition to replacing the titanium powder as the first material with the amorphous alloy Mg 20 Al 70 The cookware of Example 3 is prepared by the same method as that of Example 1 except for P2C4N4.

[0091] Example 4

[0092] In addition to replacing the titanium powder as the first material with amorphous alloy Ti 60 Ga 35 The cookware of Example 4 was prepared by the same method as that of Example 1 except for C1N1O2P1.

[0093] Example 5

[0094] In addition to replacing the titanium powder as the first material with the amorphous alloy Ge 40 Y 50 Except for C2N1O2B2S2P1, the cookware of Example 5 is prepared by the same method as that of Example 1.

[0095] Example 6

[0096] The cookware of Example 6 was prepared in the same manner as in Example 1, except that the stainless steel substrate was replaced by a titanium substrate.

[0097] Example 7

[0098] The cookware of Example 7 was prepared in the same manner as in Example 1, except that the stainless steel substrate was replaced by an aluminum substrate and a transition layer with a thickness of 30 μm was formed on the aluminum substrate.

[0099] Example 8

[0100] The cookware of Example 8 was prepared in the same manner as in Example 1, except that the stainless steel substrate was replaced by an iron-magnesium composite substrate and a transition layer with a thickness of 30 μm was formed on the iron-magnesium composite substrate.

[0101] Comparative Example 1

[0102] The cookware of Comparative Example 1 was formed by plasma spraying titanium powder on a stainless steel substrate to form a coating with a thickness of 60 μm (the plasma spraying parameters were the same as those of Example 1).

[0103] Comparative Example 2

[0104] The cookware of Comparative Example 2 was formed by plasma spraying an iron-niobium alloy on a stainless steel substrate to form a coating with a thickness of 60 μm (the plasma spraying parameters were the same as those of Example 1).

[0105] Comparative Example 3

[0106] Using amorphous alloy Mg 20 Al 70 P2C4N4 is plasma sprayed on the stainless steel substrate to form a coating with a thickness of 60 μm (the plasma spraying parameters are the same as those in Example 1), thereby forming the cookware of Comparative Example 3.

[0107] Comparative Example 4

[0108] Amorphous alloy Ti 60 Ga 35 C1N1O2P1 is plasma sprayed on a stainless steel substrate to form a coating with a thickness of 60 μm (the plasma spraying parameters are the same as those in Example 1), thereby forming the cookware of Comparative Example 4.

[0109] Comparative Example 5

[0110] Using amorphous alloy Ge 40 Y 50 C2N1O2B2S2P1 is plasma sprayed on a stainless steel substrate to form a coating with a thickness of 60 μm (the plasma spraying parameters are the same as those in Example 1), thereby forming the cookware of Comparative Example 5.

[0111] Comparative Example 6

[0112] The cookware of Comparative Example 6 was formed by plasma spraying a coating with a thickness of 60 μm on a stainless steel substrate using metallic silicon powder (the plasma spraying parameters are the same as those of Example 1).

[0113] Comparative Example 7

[0114] The cookware of Comparative Example 7 is formed by plasma spraying titanium powder on a stainless steel substrate to form a coating with a thickness of 60 μm, and oxidizing the coating in an air environment at a high temperature tunnel furnace at 400° C. / 30 min to form an oxide layer on the surface.

[0115] Table 1 Parameters of the embodiments of the present application and the comparative examples

[0116]

[0117] Performance index test

[0118] (1) The amorphization degree of the coating of the cookware of Examples 1-8 and Comparative Examples 1-7 was tested, and the test method was as follows:

[0119] Amorphous degree test method: XRD test is used and the conventional full spectrum fitting method is used for analysis and calculation to obtain the amorphous degree of the sample. The steps of the conventional full spectrum fitting method are as follows: First, find a crystalline phase with the same chemical structure as the amorphous phase, assuming that the amorphous phase is a tiny grain of this crystalline phase, and this crystalline phase can be used to establish a model of the peak position and intensity of the amorphous phase; secondly, fit the spectrum of the pure amorphous phase to determine the grain size and microstrain; finally, fix the grain size and microstrain, include this phase in the traditional Rietveld quantitative calculation, and the amorphous content (that is, the degree of amorphization) can be obtained and recorded in Table 2 below.

[0120] Table 2 Amorphization degree test data of the examples and comparative examples of the present application

[0121]

[0122] It can be seen from Example 1 and Comparative Example 7 that room temperature oxidation cannot form an amorphous oxide layer of a preset thickness of the present application, and it only forms a dense oxide film on the coating surface, and the oxide film can protect the oxidation from continuing.

[0123] (2) The performance of the cookware of Examples 1-8 and Comparative Examples 1-6 was tested and recorded in Table 3 below. The specific performance test method is as follows:

[0124] ① Initial non-stickiness test method: GB / T32095.2-2015 fried egg non-stickiness test method. This method is an initial non-stickiness test, which is divided into levels Ⅰ, II, and III. Level Ⅰ has the best non-stickiness and level Ⅲ has the worst non-stickiness.

[0125] ② Long-lasting non-stick test method: The long-lasting non-stick test method in GB / T32388-2015, the unit is the number of times, the higher the number, the longer the life, the non-stick result is evaluated once every 500 times, and the number of times when it is used to level III is recorded.

[0126] ③ Evaluation of the non-stick properties of dishes, which can show the stain resistance and non-stick properties during actual use.

[0127] 1) Stir-fried tofu

[0128] Prepare ingredients: 150g of firm tofu (cut into cubes, about 10 pieces) and 20mL of cooking oil.

[0129] Step 1. After cleaning the surface of the pot, heat the pot to 200°C over the highest heat. Then pour in cooking oil and heat until a small amount of oil smoke is produced. Turn the pot to allow the oil to fully soak the entire inner surface of the pot. Then put in the tofu and turn to medium heat.

[0130] Step 2: After one side of the tofu is fried until slightly yellow, turn it over and continue frying until both sides turn yellow. Stop and serve.

[0131] 2) Stir-fried shredded potatoes

[0132] Prepare ingredients: 200g shredded potatoes, 20mL cooking oil, 25g vinegar and 5g light soy sauce.

[0133] Step 1. Wash the surface of the pot and heat it to 200℃ over the highest heat. Pour in cooking oil and heat until a small amount of oil smoke is produced. Turn the pot so that the oil fully submerges the entire inner surface of the pot. Add shredded potatoes and stir-fry with a spatula until the potatoes are half-cooked.

[0134] Step 2. Add vinegar and light soy sauce and continue to stir-fry until cooked through.

[0135] Evaluation method:

[0136] Grade A: basically non-stick when stir-frying, and the pan is relatively clean;

[0137] Grade B: Normal stir-frying with slight stickiness and a small amount of residue;

[0138] Grade C: Stir-frying sticks to the pan during normal cooking, with a large amount of residue left in the pan.

[0139] Table 3 Performance index test data of the embodiments of the present application and the comparative examples

[0140]

[0141] In summary, it can be seen from Tables 2 and 3 above that the surface layer of the non-stick coating formed by high-temperature oxidation can obtain an oxide layer with an increased amorphous ratio, thereby enabling the cookware to have excellent non-stick properties. In addition, the cookware of the present application has a good user experience and good stain resistance during use, thereby enhancing the visual experience of the cookware during use.

[0142] According to the method for manufacturing cookware of the present application, the surface of the amorphous oxide layer is the surface of the cookware in contact with the food, and the amorphous oxide layer with a preset thickness (depth) has a low surface energy, thereby improving the non-stickiness of the cookware. When the non-stickiness is improved, it is not easy for dirt to accumulate in the pores or depressions, thereby improving the visual experience of using the cookware. In addition, during the use of the cookware, the surface of the surface layer with the amorphous oxide layer is the surface of the cookware in contact with the food, and the metal oxide inside is stable, not easy to change color, and has a darker color, thereby enhancing the stain resistance of the surface of the cookware, thereby further improving the visual experience of using the cookware.

[0143] Although the embodiments of the present application have been described in detail above, those skilled in the art may 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, in the opinion of those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present application defined by the claims.

Claims

1. A method for manufacturing a cookware, characterized in that: The method for manufacturing a cookware comprises: A non-stick coating composed of a composite material of a metal material and metal silicon powder is formed on a cookware substrate, wherein the metal material is a metal element or an alloy, and based on the total weight of the composite material being 100%, the weight of the metal material accounts for 55%-75% of the total weight of the composite material, and the remainder is the metal silicon powder; The cookware substrate having the non-stick coating is subjected to a high-temperature oxidation treatment, so that at least a portion of the metal of the metal material on the surface layer of the non-stick coating is oxidized into a metal oxide, the metal oxide is darker in color than the metal, and the metal silicon powder generates a silicon dioxide film with an amorphous phase, the amorphous silicon dioxide film penetrates into the metal oxide and forms an amorphous oxide layer with a preset thickness on the surface layer of the non-stick coating, and the surface of the amorphous oxide layer serves as the inner surface of the cookware.

2. The method for manufacturing a cookware according to claim 1, characterized in that: The step of performing high temperature oxidation treatment on the cookware substrate having the non-stick coating comprises: Placing the cookware substrate having the non-stick coating in an oxygen-free environment and heating it to a predetermined temperature; Then, distilled water is added at a predetermined rate. The distilled water can be vaporized into water vapor at the predetermined temperature, so that the non-stick coating is placed in a water vapor environment and maintained for a preset time.

3. The method for manufacturing a cookware according to claim 1, characterized in that: The step of forming a non-stick coating composed of a composite material of metal material and metal silicon powder on a cookware substrate comprises: Mixing a metal material and metal silicon powder to form the composite material; The composite material is sprayed on the base of the cookware, thereby obtaining a non-stick coating composed of metal material and metal silicon powder distributed alternately.

4. The method for manufacturing a cookware according to claim 1, characterized in that: The non-stick coating is a thermal spray coating with a rough structure on the surface, the alloy is an amorphous alloy, and the thermal spray coating includes core particles with an amorphous structure and outer coating particles with a crystal structure located on the surface of the core particles, and the crystal structure of the outer coating particles can be transformed into an amorphous structure after high-temperature oxidation treatment.

5. The method for manufacturing a cookware according to claim 1, characterized in that: The alloy includes at least one of a binary amorphous alloy, a ternary amorphous alloy and a high entropy amorphous alloy; the metal element includes at least one of Ti, Fe, Y and Zr.

6. The method for manufacturing a cookware according to claim 5, characterized in that: Taking the total atomic percentage as 100%, the binary amorphous alloy includes two main metal elements whose atomic percentage is more than 90% and the remainder of secondary non-metal elements, and the atomic percentage of any one of the two main metal elements is more than 10%, wherein the two main metal elements include two of Mg, Al, Ca, Ti, Fe, Zn, Ga, Ge, Y, Zr and Sn, and the secondary non-metal elements include at least one of C, N, O, B, S and P.

7. The method for manufacturing a cookware according to claim 1, characterized in that: The method for manufacturing the cookware further comprises: before the step of forming the non-stick coating, forming a transition layer on the surface of the cookware substrate using a corrosion-resistant material, wherein the non-stick coating is formed on the surface of the transition layer.

8. The method for manufacturing a cookware according to claim 7, characterized in that: The corrosion-resistant material is at least one of aluminum oxide, titanium oxide, zirconium oxide and titanium suboxide.

9. A cookware, characterized in that: The cookware includes a cookware substrate and a coating formed on the surface of the cookware substrate, the surface layer of the coating includes an amorphous oxide layer of a preset thickness, the amorphous oxide layer is formed by a metal oxide and silicon dioxide with an amorphous phase infiltrated into the metal oxide, the metal oxide is formed by high-temperature oxidation of at least a portion of the metal in the metal material in the composite material, wherein the metal oxide is darker in color than the metal, the composite material includes a metal material and metal silicon powder, the metal material is a metal element or an alloy, and the weight of the metal material accounts for 55%-75% of the total weight of the composite material, with the remainder being the metal silicon powder, based on the total weight of the composite material being 100%.

10. The cookware according to claim 9, characterized in that: The amorphous content of the amorphous oxide layer is not less than 65%; and / or the cookware substrate includes an aluminum substrate, an iron substrate, a magnesium substrate, a stainless steel substrate or a titanium substrate, and a composite substrate formed by the above substrates.

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