Aluminum base IH applicable electric cooker inner pot and preparation method and application thereof

Abstract

The application discloses a preparation method of an aluminum substrate IH applicable electric appliance inner pot, which comprises the following steps: S1, stamping forming an aluminum pot body structure and carrying out surface pretreatment; S2, mixing three kinds of different formula silica coating powder mixtures to realize the continuous spraying of a gradient distribution magnetic conductive layer from the bottom center to the upper part of the pot wall along the outer surface of the pot body by a cold spraying process; S3, placing in a protective atmosphere to carry out a first annealing treatment; S4, depositing a layer of ceramic coating easy-to-clean protective layer on the magnetic conductive layer of the outer surface of the pot body; S5, placing in a protective atmosphere again to carry out a second annealing treatment, so as to obtain the aluminum substrate IH applicable electric appliance inner pot. The preparation method realizes the performance optimization of the inner pot in different areas, improves the heating efficiency and uniformity, enhances the wear resistance and easy-to-clean property of the coating, and can meet the comprehensive demand of modern kitchen appliances on high-performance inner pots.

Description

Technical Field

[0001] This invention relates to the technical field of kitchenware, and in particular to an aluminum-based IH-compatible inner pot for electric appliances, its preparation method, and its application. Background Technology

[0002] In modern kitchen appliances, IH (induction heating) technology is widely used due to its high efficiency and energy saving. The inner pot of an IH-compatible appliance, as the core component of induction heating, directly affects cooking results and lifespan. Traditional IH inner pots are typically made of a single material or with a simple coating, which presents several technical limitations. For example, traditional inner pots often suffer from uneven heating during the heating process, leading to localized overheating of the bottom and affecting the cooking quality of food. Furthermore, traditional inner pots have limited wear resistance, easily showing signs of wear and oxidation with frequent use, shortening their lifespan. Simultaneously, the ease of cleaning traditional inner pots needs improvement; they tend to accumulate stains after prolonged use, increasing cleaning difficulty and time. These problems not only affect the user experience but also limit the further promotion and application of IH technology in kitchen appliances. Therefore, developing a higher-performance IH-compatible inner pot and its manufacturing method has become a pressing technical problem for those skilled in the art. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the present invention provides a method for preparing an aluminum-based IH-compatible electric appliance inner pot to solve the deficiencies of traditional IH-compatible electric appliance inner pots in terms of heating efficiency, magnetic conductivity, wear resistance and ease of cleaning.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A method for preparing an aluminum-based IH-compatible inner pot for electric appliances, the method comprising the following steps:

[0006] S1: Aluminum material is selected as the raw material for the pot body, and it is formed into a pot body structure including the bottom and the wall through a stamping process; the formed pot body is cleaned, degreased and roughened on the surface.

[0007] S2: Using a multi-channel powder conveying system and a dynamic mixer, three different formulations of silica-coated powder mixtures are respectively applied to the bottom area, the lower part of the pot wall, and the upper part of the pot wall. Combined with an automated control system, the spraying position is dynamically adjusted, and the spraying parameters are dynamically adjusted through a cold spraying process. Along the outer surface of the pot after the pretreatment in step S1, a gradient distribution of the magnetic conductive layer is continuously sprayed from the center of the bottom of the pot to the upper part of the pot wall.

[0008] S3: Place the pot body that has been sprayed in step S2 in a protective atmosphere for annealing, and then air cool it.

[0009] S4: A ceramic coating layer that is easy to clean is deposited on the magnetically conductive layer on the outer surface of the pot obtained in step S3;

[0010] S5: Place the pot body obtained in step S4 in a protective atmosphere again for secondary annealing, and then air cool to obtain the aluminum substrate IH suitable appliance inner pot.

[0011] In step S2 of this application, a gradient distribution is achieved by designing magnetically conductive layers with different formulations in different areas of the pot body, enabling targeted performance optimization of the inner pot in different regions. The high magnetic permeability and wear resistance of the bottom area ensure rapid heating and durability; the enhanced toughness and crack resistance of the lower part of the pot wall improve the overall stability of the pot body; and the high thermal stability of the upper part of the pot wall reduces heat loss and oxidation risk. This gradient distribution magnetically conductive layer design not only improves the overall performance of the inner pot but also achieves energy-saving effects, meeting the comprehensive needs of IH-compatible electric appliance inner pots in terms of high efficiency, durability, and energy saving.

[0012] This application significantly improves the overall performance of aluminum-based IH (Induction Heating) appliance inner pots through a primary annealing process in step S3 and a secondary annealing process in step S5. The primary annealing process, performed after cold spraying to form a magnetically conductive layer, effectively eliminates internal stress in the coating, preventing cracks or peeling. It also optimizes the coating's microstructure, making it denser, thereby improving its mechanical and corrosion resistance, enhancing its magnetic conductivity, and ensuring the inner pot can efficiently respond to the electromagnetic field during IH heating, achieving rapid and uniform heating. The secondary annealing process, performed after depositing an easy-to-clean protective ceramic coating layer, further optimizes the performance of the protective layer, allowing it to better bond with the magnetically conductive layer. This enhances its wear resistance and corrosion resistance, improves thermal stability, ensures the protective layer maintains good performance at high temperatures, and makes the surface of the protective layer smoother, reducing the adhesion of food residue and stains, and improving the ease of cleaning of the inner pot.

[0013] As a preferred technical solution, the outer layer of the first silica-coated powder mixture corresponding to the bottom area of ​​the pot is silica, and the inner layer is composed of the following raw materials: 70-75 parts by weight of nano-iron-silicon-aluminum powder, 8-12 parts by weight of iron-nickel alloy, 8-12 parts by weight of nano-alumina, and 8-12 parts by weight of tungsten carbide. The inner layer formulation of the first silica-coated powder mixture in this application gives the magnetically conductive layer in the bottom area high magnetic permeability and good wear resistance, enabling rapid response to electromagnetic induction heating, achieving efficient heating, while reducing wear on the bottom of the pot during frequent use and extending its service life.

[0014] As a preferred technical solution, the outer layer of the second type of silica-coated powder mixture corresponding to the lower region of the pot wall is silica, and the inner layer is composed of the following raw materials: 55-60 parts by weight of nano-iron-silicon-aluminum powder, 12-18 parts by weight of iron-nickel alloy, 8-12 parts by weight of nano-alumina, and 6-8 parts by weight of tungsten carbide. The inner layer formulation of the second type of silica-coated powder mixture in this application, while ensuring a certain level of magnetic conductivity, increases the proportion of iron-nickel alloy, enhancing the toughness and crack resistance of the lower region of the pot wall, enabling it to better withstand the thermal and mechanical stresses during use, while maintaining good wear resistance.

[0015] As a preferred technical solution, the outer layer of the third type of silica-coated powder mixture corresponding to the upper region of the pot wall is silica, and the inner layer is composed of the following raw materials: 35-45 parts by weight of nano-iron-silicon-aluminum powder, 8-12 parts by weight of iron-nickel alloy, 8-12 parts by weight of nano-alumina, and 2-5 parts by weight of tungsten carbide. The inner layer formulation of the third type of silica-coated powder mixture in this application results in a relatively low magnetic permeability but higher thermal stability in the magnetically conductive layer of the upper pot wall, effectively reducing heat loss and improving thermal efficiency.

[0016] In this invention, the three silica-coated powder mixtures corresponding to different areas of the pot body all adopt an inner and outer layer structure design. The outer layer is silica, and the inner layer is composed of iron-silicon-aluminum powder, iron-nickel alloy, alumina, and tungsten carbide in different proportions. This design brings significant technical benefits during the cold spraying process. First, the silica coating layer effectively isolates the inner metal powder from direct contact with the external environment, significantly enhancing the coating's oxidation and corrosion resistance, and reducing performance degradation caused by oxidation and corrosion. Especially at high temperatures, the high chemical stability of silica effectively protects the inner metal powder. Second, the silica coating layer improves the powder's flowability and dispersibility, making the sprayed coating more uniform, improving adhesion, reducing porosity, and enhancing the coating's density and mechanical properties. Furthermore, the inner metal powder has high magnetic permeability, enabling rapid response to electromagnetic induction heating, while the silica coating layer provides additional protection and stability without affecting the magnetic permeability, optimizing the coating's magnetic permeability and improving the overall heating efficiency of the inner pot. Meanwhile, the high hardness and wear resistance of the silica coating effectively reduce wear and peeling of the coating during use, extending the service life of the inner pot.

[0017] As a preferred technical solution, the spraying parameters include a spraying speed of 320-380 m / s, a powder feeding pressure of 1.5-2.5 MPa, and a working gas temperature of 200-400℃.

[0018] As a preferred technical solution, the annealing temperature of the primary annealing treatment is 480-520℃, and the holding time is 1-2 hours.

[0019] As a preferred technical solution, the easy-to-clean protective layer of the ceramic coating is composed of the following raw materials in parts by weight: 30-40 parts by weight of silica, 20-30 parts by weight of alumina, 10-20 parts by weight of titanium dioxide, 5-15 parts by weight of zirconium oxide, 5-15 parts by weight of fluorosilicone polymer, 5-10 parts by weight of binder, 3-5 parts by weight of dispersant, and 30-50 parts by weight of deionized water. By rationally proportioning the above raw materials, this invention enables the easy-to-clean protective layer of the ceramic coating to not only possess excellent high-temperature resistance, chemical stability, and wear resistance, but also good hydrophobicity and easy-to-clean properties. This protective layer effectively prevents the adhesion of stains to the pot body, reduces cleaning difficulty and time, and improves the user experience. At the same time, the high adhesion and stability of the protective layer ensure its durability during long-term use, extending the service life of the inner pot.

[0020] As a preferred technical solution, the annealing temperature of the secondary annealing treatment is 300-400℃, and the holding time is 2-4 hours.

[0021] As a preferred technical solution, the outer surface of the magnetic conductive layer has a protruding structure. This protruding structure not only enhances the effect of electromagnetic induction heating but also creates multiple small thermal convection effects, causing the food inside the pot to tumble and resulting in more even heating, thus further improving the cooking quality.

[0022] Another aspect of the present invention is to provide an aluminum-based IH-compatible inner pot for electrical appliances, wherein the inner pot is prepared by the above-described method for preparing an aluminum-based IH-compatible inner pot for electrical appliances.

[0023] Another aspect of the present invention is to provide an application of the aluminum substrate IH suitable inner pot for electric appliances as described above in kitchen appliances such as rice cookers or electric pressure cookers.

[0024] The beneficial effects of this invention are:

[0025] The present invention relates to a method for preparing an aluminum-based IH-compatible inner pot for electric appliances. By innovatively designing magnetic conductive layers with different formulations in different areas of the pot body, a gradient distribution from the center of the bottom of the pot to the upper part of the pot wall is achieved. This not only achieves efficient and uniform heating, but also results in high wear resistance and long service life of the coating.

[0026] In summary, the aluminum-based IH-type inner pot of the present invention not only has excellent magnetic conductivity and wear resistance, but also good cleanability and thermal stability, which can meet the comprehensive needs of modern kitchen appliances for high efficiency, energy saving, durability and easy maintenance. Detailed Implementation

[0027] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0028] Example 1

[0029] The method for preparing an aluminum substrate IH-compatible inner pot for electric appliances in this embodiment includes the following steps:

[0030] S1: Aluminum is selected as the raw material for the pot body, which is formed into a pot body structure including the bottom and walls through a high-precision stamping process. During the stamping process, multi-stage stamping dies are used to ensure the shape accuracy and dimensional stability of the pot body. After forming, the pot body is first ultrasonically cleaned to remove surface oil and impurities, ensuring surface cleanliness. Subsequently, a deep degreasing treatment is performed using any chemical degreasing agent known to those skilled in the art to further remove residual grease from the pot body surface. Finally, the pot body surface is sandblasted to increase surface roughness and improve the adhesion of subsequent coatings. The surface roughness of the pot body after sandblasting is controlled between Ra1.5 and Ra3.0 to ensure uniform coating adhesion.

[0031] S2: A multi-channel powder conveying system and a dynamic mixer are used to distribute three different silica-coated powder mixtures to the bottom, lower, and upper parts of the pot, respectively. An automated control system dynamically adjusts the spraying position, and a cold spraying process dynamically adjusts the spraying parameters. This achieves continuous spraying of a gradient-distributed magnetic layer from the center of the bottom to the upper part of the pot wall along the pre-treated outer surface of the pot from step S1. Specifically, the multi-channel powder conveying system ensures that each powder mixture is independently and precisely delivered to the dynamic mixer, which then switches and adjusts the powder in each channel in real time according to the needs of different areas of the pot, achieving precise formula control. The cold spraying process uses a high-speed airflow to accelerate the powder, and combined with the powder delivery pressure and temperature of the working gas (such as nitrogen or argon), ensures that the powder forms a dense and uniform coating upon impact with the pot surface. The automated control system monitors position changes in real time during the spraying process using high-precision sensors and dynamically adjusts the spraying parameters according to the position of the pot, ensuring the effectiveness of the gradient distribution of the coating. Further, the spraying parameters corresponding to the bottom region of the pot include a spraying speed of 380 m / s, a powder feeding pressure of 2.5 MPa, and a working gas temperature of 350°C; the spraying parameters corresponding to the lower region of the pot wall include a spraying speed of 360 m / s, a powder feeding pressure of 2 MPa, and a working gas temperature of 300°C; and the spraying parameters corresponding to the upper region of the pot wall include a spraying speed of 320 m / s, a powder feeding pressure of 1.5 MPa, and a working gas temperature of 250°C. The coating thicknesses obtained for the bottom region, the lower region of the pot wall, and the upper region of the pot wall are 200 μm, 120 μm, and 80 μm, respectively. Furthermore, the outer surface of the obtained magnetic conductive layer exhibits a papillary structure. The papillary structure includes multiple tiny protrusions, with a height of 0.1 mm to 1.0 mm and a spacing between adjacent protrusions of 0.5 mm to 2.0 mm.

[0032] S3: Place the pot body that has been sprayed in step S2 in a nitrogen protective atmosphere and perform a first annealing treatment. The annealing temperature of the first annealing treatment is 520°C and the holding time is 2 hours, followed by air cooling.

[0033] S4: A ceramic coating easy-to-clean protective layer is deposited on the magnetic conductive layer on the outer surface of the pot obtained in step S3; the ceramic coating easy-to-clean protective layer is composed of the following raw materials in parts by weight: 30 parts by weight of silica, 20 parts by weight of alumina, 10 parts by weight of titanium dioxide, 5 parts by weight of zirconium oxide, 10 parts by weight of fluorosilicone polymer, 8 parts by weight of polymethyl methacrylate binder, 5 parts by weight of sodium citrate dispersant, and 50 parts by weight of deionized water. The fluorosilicone polymer is obtained by copolymerization of ethyl 2-(perfluorobutyl)acrylate and trimethylsilyl 2-acrylate in a molar ratio of 1:1.

[0034] S5: Place the pot body obtained in step S4 in a nitrogen protective atmosphere again for a second annealing treatment. The annealing temperature of the second annealing treatment is 350°C and the holding time is 3 hours. Then air cool to obtain the aluminum substrate IH suitable appliance inner pot.

[0035] The outer layer of the first type of silica-coated powder mixture corresponding to the bottom region of the pot is silica, and the inner layer is composed of the following ingredients: 70 parts by weight of nano-iron-silicon-aluminum powder, 8 parts by weight of iron-nickel alloy, 12 parts by weight of nano-alumina, and 10 parts by weight of tungsten carbide. The outer layer of the second type of silica-coated powder mixture corresponding to the lower region of the pot wall is silica, and the inner layer is composed of the following ingredients: 60 parts by weight of nano-iron-silicon-aluminum powder, 18 parts by weight of iron-nickel alloy, 10 parts by weight of nano-alumina, and 8 parts by weight of tungsten carbide. The outer layer of the third type of silica-coated powder mixture corresponding to the upper region of the pot wall is silica, and the inner layer is composed of the following ingredients: 45 parts by weight of nano-iron-silicon-aluminum powder, 8 parts by weight of iron-nickel alloy, 8 parts by weight of nano-alumina, and 5 parts by weight of tungsten carbide. Specifically, the preparation method of the first silica-coated powder mixture is as follows: the raw materials of the inner layer formulation are ground and mixed evenly, and then calcined at 650°C in a muffle furnace. After grinding and sieving, pretreated raw materials are obtained. Ethanol and ammonia water with a volume ratio of 8:1 are stirred evenly to form a mixture. Then, tetraethyl orthosilicate and decaalkyltrimethylammonium bromide are added while stirring. The mass concentrations of tetraethyl orthosilicate and decaalkyltrimethylammonium bromide in the mixture are 15 g / L and 2 g / L, respectively. The mixture is stirred continuously at room temperature for a certain period of time to form a sol. The pretreated inner layer formulation raw materials are added to the sol. The mass concentration of the inner layer formulation raw materials in the mixture is 20 g / L. The mixture is ultrasonically stirred at 70°C for 1 hour and then the reaction is stopped. A gel is formed on the surface of the sol. The mixture is washed several times with ethanol, filtered, and spray-dried to obtain the first silica-coated powder mixture. The preparation methods of the second and third silica-coated powder mixtures are the same as those of the first silica-coated powder mixture.

[0036] Example 2

[0037] The preparation method of the aluminum-based IH-compatible inner pot for electric appliances in this embodiment is basically the same as that in Embodiment 1 in terms of raw material composition and preparation steps. The difference is that in the preparation method of this embodiment, the outer layer of the first type of silica-coated powder mixture corresponding to the bottom region of the pot is silica, and the inner layer is composed of the following raw materials: 72 parts by weight of nano-iron-silicon-aluminum powder, 10 parts by weight of iron-nickel alloy, 10 parts by weight of nano-alumina, and 10 parts by weight of tungsten carbide. The outer layer of the second type of silica-coated powder mixture corresponding to the lower region of the pot wall is silica, and the inner layer is composed of the following raw materials: 58 parts by weight of nano-iron-silicon-aluminum powder, 16 parts by weight of iron-nickel alloy, 10 parts by weight of nano-alumina, and 7 parts by weight of tungsten carbide. The outer layer of the third type of silica-coated powder mixture corresponding to the upper region of the pot wall is silica, and the inner layer is composed of the following raw materials: 40 parts by weight of nano-iron-silicon-aluminum powder, 10 parts by weight of iron-nickel alloy, 8 parts by weight of nano-alumina, and 3 parts by weight of tungsten carbide.

[0038] Example 3

[0039] The preparation method of the aluminum-based IH-compatible inner pot for electric appliances in this embodiment is basically the same as that in Embodiment 1 in terms of raw material composition and preparation steps. The difference is that in the preparation method of this embodiment, the outer layer of the first type of silica-coated powder mixture corresponding to the bottom region of the pot is silica, and the inner layer is composed of the following raw materials: 75 parts by weight of nano-iron-silicon-aluminum powder, 12 parts by weight of iron-nickel alloy, 10 parts by weight of nano-alumina, and 8 parts by weight of tungsten carbide. The outer layer of the second type of silica-coated powder mixture corresponding to the lower region of the pot wall is silica, and the inner layer is composed of the following raw materials: 55 parts by weight of nano-iron-silicon-aluminum powder, 12 parts by weight of iron-nickel alloy, 8 parts by weight of nano-alumina, and 6 parts by weight of tungsten carbide. The outer layer of the third type of silica-coated powder mixture corresponding to the upper region of the pot wall is silica, and the inner layer is composed of the following raw materials: 35 parts by weight of nano-iron-silicon-aluminum powder, 8 parts by weight of iron-nickel alloy, 8 parts by weight of nano-alumina, and 2 parts by weight of tungsten carbide.

[0040] Comparative Example 1

[0041] The preparation method of the aluminum substrate IH applicable electric inner pot of this comparative example is basically the same as that of Example 1 in terms of raw material composition and preparation steps. The difference is that in the preparation method of this comparative example, the three areas of the pot body in step S2 are all cold sprayed with the second type of silica coating powder mixture.

[0042] Comparative Example 2

[0043] The preparation method of the aluminum substrate IH suitable for electric appliance inner pot in this comparative example is basically the same as that in Example 1 in terms of raw material composition and preparation steps. The difference is that the preparation method in this comparative example does not perform the first annealing treatment in step S3 and the second annealing treatment in step S5.

[0044] The aluminum-based IH-compatible electric inner pots prepared in Examples 1-3 and Comparative Examples 1-2 were subjected to performance tests, and the performance results are shown in Table 1.

[0045] The heating efficiency performance test used a standard IH heating device, added 2L of room temperature water, recorded the time to heat to 100℃, and calculated the heating efficiency (℃ / min) = (100℃ - room temperature) / heating time (min).

[0046] For wear resistance performance testing, a Taber wear tester was used to conduct wear tests on the sample surface with a CS-10 wear wheel, a 1000g load, and 1000 revolutions. Afterwards, a profilometer was used to measure the wear depth.

[0047] The ease of cleaning performance test involved applying simulated stains to the inner surface of the pot, heating it to dry, cleaning it with a standard detergent and a sponge for 5 minutes, and then evaluating the stain residue rate using an optical microscope.

[0048] The magnetic permeability performance was tested using an electromagnetic induction tester. At a test frequency of 50 Hz, the permeability of the sample under different magnetic field strengths was recorded and the average value was calculated. Table 1

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A method for preparing an aluminum-based IH-compatible inner pot for electric appliances, characterized in that, The preparation method includes the following steps: S1: Aluminum material is selected as the raw material for the pot body, and it is formed into a pot body structure including the bottom and the wall through a stamping process; the formed pot body is cleaned, degreased and roughened on the surface. S2: Using a multi-channel powder conveying system and a dynamic mixer, three different formulations of silica-coated powder mixtures are respectively applied to the bottom area, the lower part of the pot wall, and the upper part of the pot wall. Combined with an automated control system, the spraying position is dynamically adjusted, and the spraying parameters are dynamically adjusted through a cold spraying process. Along the outer surface of the pot after the pretreatment in step S1, a gradient distribution of the magnetic conductive layer is continuously sprayed from the center of the bottom of the pot to the upper part of the pot wall. S3: Place the pot body that has been sprayed in step S2 in a protective atmosphere for annealing, and then air cool it. S4: A ceramic coating layer that is easy to clean is deposited on the magnetically conductive layer on the outer surface of the pot obtained in step S3; S5: Place the pot body obtained in step S4 in a protective atmosphere again for secondary annealing, and then air cool to obtain the aluminum substrate IH applicable electrical appliance inner pot. The outer layer of the first type of silica-coated powder mixture corresponding to the bottom region of the pot is silica, and the inner layer is composed of the following ingredients: 70-75 parts by weight of nano-iron-silicon-aluminum powder, 8-12 parts by weight of iron-nickel alloy, 8-12 parts by weight of nano-alumina, and 8-12 parts by weight of tungsten carbide; the outer layer of the second type of silica-coated powder mixture corresponding to the lower region of the pot wall is silica, and the inner layer is composed of the following ingredients: 55-60 parts by weight of nano-iron-silicon-aluminum powder, 12-18 parts by weight of iron-nickel alloy, 8-12 parts by weight of nano-alumina, and 6-8 parts by weight of tungsten carbide; the outer layer of the third type of silica-coated powder mixture corresponding to the upper region of the pot wall is silica, and the inner layer is composed of the following ingredients: 35-45 parts by weight of nano-iron-silicon-aluminum powder, 8-12 parts by weight of iron-nickel alloy, 8-12 parts by weight of nano-alumina, and 2-5 parts by weight of tungsten carbide.

2. The method for preparing the aluminum substrate IH-compatible inner pot for electrical appliances as described in claim 1, characterized in that, The spraying parameters include a spraying speed of 320–380 m / s, a powder feeding pressure of 1.5–2.5 MPa, and a working gas temperature of 200–400 °C.

3. The method for preparing the aluminum substrate IH-compatible inner pot for electrical appliances as described in claim 1, characterized in that, The annealing temperature for the first annealing process is 480–520°C, and the holding time is 1–2 hours.

4. The method for preparing the aluminum substrate IH-compatible inner pot for electrical appliances as described in claim 1, characterized in that, The outer surface of the magnetic conductive layer has a protruding structure.

5. The method for preparing the aluminum substrate IH-compatible inner pot for electrical appliances as described in claim 1, characterized in that, The annealing temperature for the secondary annealing process is 300–400°C, and the holding time is 2–4 hours.

6. An aluminum-based IH-compatible inner pot for electric appliances, characterized in that, The inner pot of the appliance is prepared by the method for preparing an aluminum-based IH appliance inner pot as described in any one of claims 1 to 5.

7. The application of the aluminum substrate IH suitable inner pot as described in claim 6 in rice cookers or electric pressure cookers.

Images