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

Abstract

The invention discloses a preparation method of an aluminum base material IH applicable electric appliance inner pot. The preparation method comprises the following steps that S1, an aluminum pot body structure is subjected to punch forming, and surface pretreatment is conducted; s2, continuously spraying a gradient distribution magnetic conductive layer from the center of the pot bottom to the upper part of the pot wall along the outer surface of the pot body by a cold spraying process on a mixture of the three kinds of silicon dioxide coated powder with different formulas; s3, placing in a protective atmosphere, and carrying out primary annealing treatment; s4, depositing a ceramic coating easy-to-clean protective layer on the magnetic conductive layer on the outer surface of the pot body; and S5, the inner pot is placed in the protective atmosphere again, secondary annealing treatment is conducted, and the aluminum base material IH applicable electric appliance inner pot is obtained. According to the preparation method, performance optimization of the inner pot in different areas is achieved, the heating efficiency and uniformity are improved, the wear resistance and easy-to-clean performance of the coating are enhanced, and the comprehensive requirements of modern kitchen appliances for the high-performance inner pot can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen utensils, and particularly to an aluminum-based IH applicable inner pot for electric appliances, its preparation method and application. Background Art

[0002] In modern kitchen appliances, IH (Induction Heating) technology is widely used due to its characteristics of high efficiency and energy saving. The IH applicable inner pot, as the core component of electromagnetic induction heating, its performance directly affects the cooking effect and service life. Traditional IH inner pots are usually prepared with single materials or simple coatings, and there are some technical limitations. For example, traditional inner pots often have the problem of uneven heating during the heating process, resulting in local overheating at the bottom of the pot, which affects the cooking quality of food. In addition, the wear resistance of traditional inner pots is limited, and they are prone to wear and oxidation due to frequent use, shortening the service life of the inner pot. At the same time, the easy-to-clean performance of traditional inner pots also needs to be improved. After long-term use, stains are likely to accumulate, increasing the cleaning difficulty and time. These problems not only affect the user experience, but also limit the further popularization and application of IH technology in kitchen appliances. Therefore, developing an IH applicable inner pot for electric appliances with better performance and its preparation method has become an urgent technical problem for those skilled in the art. Summary of the Invention

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

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

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

[0006] S1: Select aluminum material as the raw material of the pot body, and form it into a pot body structure including a bottom and a pot wall through a stamping process; clean, degrease and roughen the surface of the formed pot body;

[0007] S2: Adopt a multi-channel powder conveying system and a dynamic mixer, and respectively correspond three different formulations of silica-coated powder mixtures to the bottom area, the lower part area of the pot wall and the upper part area of the pot wall. Combine an automatic control system to dynamically adjust the spraying position, and dynamically adjust the spraying parameters through a cold spraying process, and continuously spray a gradient distribution magnetic conductive layer from the center of the bottom to the upper part of the pot wall along the outer surface of the pot body pretreated in step S1;

[0008] S3: Place the pot body sprayed in step S2 in a protective atmosphere, perform a first annealing treatment, and then air-cool;

[0009] S4: Deposit a ceramic coating easy - to - clean protective layer on the magnetic - conductive layer on the outer surface of the pot body obtained in step S3;

[0010] S5: Place the pot body obtained in step S4 in a protective atmosphere again, perform a secondary annealing treatment, and then air - cool to obtain the inner pot of the aluminum - based IH - applicable electrical appliance.

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

[0012] Through the primary annealing treatment in step S3 and the secondary annealing treatment in step S5 of the present application, the overall performance of the inner pot of the aluminum - based IH - applicable electrical appliance is significantly improved. The primary annealing treatment is carried out after the magnetic - conductive layer is formed by cold spraying, effectively eliminating the internal stress in the coating, preventing cracks or peeling, and at the same time optimizing the microstructure of the coating to make it denser, thereby improving the mechanical properties and corrosion resistance of the coating, enhancing the magnetic - conductive performance, and ensuring that the inner pot can efficiently respond to the electromagnetic field during IH heating to achieve rapid and uniform heating. The secondary annealing treatment is carried out after depositing the ceramic coating easy - to - clean protective layer, further optimizing the performance of the protective layer, making it better combined with the magnetic - conductive layer, enhancing the wear resistance and corrosion resistance, improving the thermal stability, ensuring that the protective layer maintains good performance in a high - temperature environment, and at the same time making the surface of the protective layer smoother, reducing the adhesion of food residues and stains, and improving the easy - to - clean performance of the inner pot.

[0013] As a preferred technical solution, the outer layer of the first silicon dioxide - coated powder mixture corresponding to the bottom area of the pot is silicon dioxide, and the inner layer is composed of the following formula 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 - aluminum oxide, and 8 - 12 parts by weight of tungsten carbide. The inner - layer formula of the first silicon dioxide - coated powder mixture in the present application enables the magnetic - conductive layer in the bottom area of the pot to have high magnetic - conductive performance and good wear resistance, can quickly respond to electromagnetic induction heating to achieve efficient heating, and at the same time reduce the wear of the bottom of the pot during frequent use and extend the service life.

[0014] As a preferred technical solution, the outer layer of the second silica-coated powder mixture corresponding to the lower region of the pot wall is silica, and the inner layer is composed of the following formula 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. On the basis of ensuring a certain magnetic conductivity, the inner layer formula of the second silica-coated powder mixture in this application increases the proportion of the iron nickel alloy, enhances the toughness and crack resistance of the lower region of the pot wall, enables it to better withstand the thermal stress and mechanical stress during the use of the pot body, and at the same time maintains good wear resistance.

[0015] As a preferred technical solution, the outer layer of the third silica-coated powder mixture corresponding to the upper region of the pot wall is silica, and the inner layer is composed of the following formula 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 formula of the third silica-coated powder mixture in this application makes the magnetic conductive layer on the upper part of the pot wall have relatively low magnetic conductivity but higher thermal stability, can effectively reduce heat dissipation, and improve the thermal efficiency.

[0016] In the present invention, the three silica-coated powder mixtures corresponding to different regions 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 with different ratios. This design brings significant technical effects during the cold spraying process. First, the silica coating effectively isolates the direct contact between the inner layer metal powder and the external environment, significantly enhances the oxidation resistance and corrosion resistance of the coating, and reduces the performance degradation caused by oxidation and corrosion. Especially in a high-temperature environment, silica has high chemical stability and can effectively protect the inner layer metal powder. Second, the silica coating improves the fluidity and dispersibility of the powder, makes the sprayed coating more uniform, improves the adhesion of the coating, reduces the porosity, and improves the density and mechanical properties of the coating. In addition, the metal powder in the inner layer has high magnetic conductivity and can quickly respond to electromagnetic induction heating. The silica coating provides additional protection and stability without affecting the magnetic conductivity, optimizes the magnetic conductivity of the coating, and improves the overall heating efficiency of the inner pot. At the same time, the high hardness and wear resistance of the silica coating effectively reduce the wear and peeling of the coating during use and extend 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 the working gas of 1.5-2.5 MPa, and a working gas temperature of 200-400 °C.

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

[0019] As a preferred technical solution, the ceramic coating easy - to - clean protective layer is composed of the following raw materials in parts by weight: 30 - 40 parts by weight of silicon dioxide, 20 - 30 parts by weight of aluminum oxide, 10 - 20 parts by weight of titanium oxide, 5 - 15 parts by weight of zirconium oxide, 5 - 15 parts by weight of fluorosilicate 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 reasonably proportioning the above raw materials, the ceramic coating easy - to - clean protective layer of the present invention not only has excellent high - temperature resistance, chemical stability, and wear resistance, but also has good hydrophobicity and easy - to - clean performance. This protective layer can effectively prevent the attachment of stains on the pot body, reduce the cleaning difficulty and time, and improve the user experience. At the same time, the high adhesion and stability of the protective layer ensure its durability during long - term use and extend the service life of the inner pot.

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

[0021] As a preferred technical solution, the outer surface of the magnetic conductive layer is a nipple structure. The nipple structure design of the magnetic conductive layer not only enhances the effect of electromagnetic induction heating, but also drives the food in the pot to tumble through the formation of multiple small heat convection effects, making the food heated more evenly and further improving the cooking quality.

[0022] Another aspect of the present invention is to provide an aluminum - based IH - applicable electrical appliance inner pot, which is prepared by the preparation method of the aluminum - based IH - applicable electrical appliance inner pot as described above.

[0023] Another aspect of the present invention is to provide an application of the aluminum - based IH - applicable electrical appliance inner pot as described above in kitchen utensils such as rice cookers or electric pressure cookers.

[0024] Advantages of the present invention:

[0025] The preparation method of the aluminum - based IH - applicable electrical appliance inner pot of the present invention, through innovatively designing magnetic conductive layers with different formulas in different areas of the pot body, realizes a gradient distribution from the center of the bottom of the pot to the upper part of the pot wall. It not only achieves an efficient and uniform heating effect, but also realizes the high wear resistance and long service life of the coating.

[0026] Generally speaking, the aluminum - based IH - applicable electrical appliance inner pot of the present invention not only has excellent magnetic conductivity and wear resistance, but also has good easy - to - clean performance and thermal stability, and can meet the comprehensive requirements of modern kitchen appliances for high efficiency, energy conservation, durability, and easy maintenance. Detailed implementation manners

[0027] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and other obvious variations can be conceived by those skilled in the art.

[0028] Embodiment 1

[0029] A method for preparing an inner pot of an IH-applicable electric appliance with an aluminum substrate in this embodiment includes the following steps:

[0030] S1: Select aluminum material as the raw material for the pot body, and form it into a pot body structure including a bottom and a pot wall through a high-precision stamping process. During the stamping process, a multi-stage stamping die is used to ensure the shape accuracy and dimensional stability of the pot body. After forming, the pot body is first ultrasonically cleaned to remove the oil and impurities on the surface to ensure surface cleanliness. Subsequently, any chemical degreasing agent known to those skilled in the art is used for deep degreasing treatment to further remove the residual grease on the surface of the pot body. Finally, the surface of the pot body is sandblasted to increase the surface roughness and improve the adhesion of the subsequent coating. The surface roughness of the sandblasted pot body is controlled between Ra1.5 and Ra3.0 to ensure that the coating can be evenly adhered.

[0031] S2: Adopt a multi-channel powder delivery system and a dynamic mixer to respectively correspond the silica-coated powder mixtures with three different formulations to the bottom area of the pot, the lower part of the pot wall, and the upper part of the pot wall. Combine an automated control system to dynamically adjust the spraying position, and dynamically adjust the spraying parameters through a cold spraying process. Along the outer surface of the pot pretreated in step S1, continuously spray a gradient-distributed magnetic conduction layer from the center of the bottom of the pot to the upper part of the pot wall. Specifically, the multi-channel powder delivery system ensures that the powder mixture of each formulation can be independently and precisely delivered to the dynamic mixer, while the dynamic mixer switches and adjusts the powder in each channel in real time according to the requirements of different areas of the pot body to achieve precise formulation control. The cold spraying process accelerates the powder with a high-speed gas flow, combines the powder feeding pressure and temperature of the working gas (such as nitrogen or argon), and ensures that the powder forms a dense and uniform coating when hitting the surface of the pot body. The automated control system monitors the position changes during the spraying process in real time through high-precision sensors and dynamically adjusts the spraying parameters according to the position area of the pot body to ensure the effectiveness of the gradient distribution of the coating. Further, the spraying parameters corresponding to the bottom area of the pot include a spraying speed of 380 m / s, a powder feeding pressure of the working gas of 2.5 MPa, and a working gas temperature of 350 °C; the spraying parameters corresponding to the lower part of the pot wall include a spraying speed of 360 m / s, a powder feeding pressure of the working gas of 2 MPa, and a working gas temperature of 300 °C; the spraying parameters corresponding to the upper part of the pot wall include a spraying speed of 320 m / s, a powder feeding pressure of the working gas of 1.5 MPa, and a working gas temperature of 250 °C. The coating thicknesses obtained corresponding to the bottom area of the pot, the lower part of the pot wall, and the upper part of the pot wall are 200 μm, 120 μm, and 80 μm respectively. Even further, the outer surface of the obtained magnetic conduction layer presents a nipple structure. The nipple structure includes a plurality of tiny protrusions, the height of the protrusions is 0.1 mm to 1.0 mm, and the spacing between adjacent protrusions is 0.5 mm to 2.0 mm.

[0032] S3: Place the pot body completed with spraying in step S2 in a nitrogen protection atmosphere and conduct a primary annealing treatment. The annealing temperature of the primary annealing treatment is 520 °C, the holding time is 2 hours, and then air-cool.

[0033] S4: Deposit a ceramic coating easy-to-clean protective layer on the magnetic conduction layer on the outer surface of the pot body 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 oxide, 5 parts by weight of zirconium oxide, 10 parts by weight of fluorosilicon polymer, 8 parts by weight of binder polymethyl methacrylate, 5 parts by weight of dispersant sodium citrate, and 50 parts by weight of deionized water. The fluorosilicon polymer is obtained by copolymerization reaction of ethyl 2-(perfluorobutyl)acrylate and trimethylsilyl 2-acrylate with a molar ratio of 1:1.

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

[0035] The outer layer of the first silicon dioxide-coated powder mixture corresponding to the bottom area of the pot is silicon dioxide, and the inner layer is composed of the following formula raw materials: 70 parts by weight of nano iron silicon aluminum powder, 8 parts by weight of iron nickel alloy, 12 parts by weight of nano aluminum oxide, and 10 parts by weight of tungsten carbide. The outer layer of the second silicon dioxide-coated powder mixture corresponding to the lower area of the pot wall is silicon dioxide, and the inner layer is composed of the following formula raw materials: 60 parts by weight of nano iron silicon aluminum powder, 18 parts by weight of iron nickel alloy, 10 parts by weight of nano aluminum oxide, and 8 parts by weight of tungsten carbide. The outer layer of the third silicon dioxide-coated powder mixture corresponding to the upper area of the pot wall is silicon dioxide, and the inner layer is composed of the following formula raw materials: 45 parts by weight of nano iron silicon aluminum powder, 8 parts by weight of iron nickel alloy, 8 parts by weight of nano aluminum oxide, and 5 parts by weight of tungsten carbide. Specifically, the preparation method of the first silicon dioxide-coated powder mixture: Grind and mix the substances of the inner layer formula raw materials evenly, place them in a muffle furnace for high-temperature calcination at 650 °C, and then grind and sieve to obtain the pretreatment raw materials; Stir ethanol and ammonia water with a volume ratio of 8:1 evenly to form a mixed solution, and then add tetraethyl orthosilicate and dodecyl trimethyl ammonium bromide while stirring. The mass concentrations of tetraethyl orthosilicate and dodecyl trimethyl ammonium bromide in the mixed solution are 15 g / L and 2 g / L respectively. Continuously stir at room temperature for a certain time. After forming a sol, add the pretreated inner layer formula raw materials to the sol. The mass concentration of the inner layer formula raw materials in the mixed solution is 20 g / L. Stop the reaction after ultrasonic stirring at 70 °C for 1 h. A gel is formed on the surface of the sol. Wash it several times with ethanol and then filter. Spray dry to obtain the first silicon dioxide-coated powder mixture. The preparation methods of the second silicon dioxide-coated powder mixture and the third silicon dioxide-coated powder mixture are the same as that of the first silicon dioxide-coated powder mixture.

[0036] Example 2

[0037] The preparation method of the inner pot of the IH applicable electric appliance with an aluminum substrate 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 silicon dioxide-coated powder mixture corresponding to the bottom area of the pot is silicon dioxide, and the inner layer is composed of the following formulated 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 silicon dioxide-coated powder mixture corresponding to the lower part of the pot wall is silicon dioxide, and the inner layer is composed of the following formulated 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 silicon dioxide-coated powder mixture corresponding to the upper part of the pot wall is silicon dioxide, and the inner layer is composed of the following formulated 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 inner pot of the IH applicable electric appliance with an aluminum substrate 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 silicon dioxide-coated powder mixture corresponding to the bottom area of the pot is silicon dioxide, and the inner layer is composed of the following formulated 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 silicon dioxide-coated powder mixture corresponding to the lower part of the pot wall is silicon dioxide, and the inner layer is composed of the following formulated 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 silicon dioxide-coated powder mixture corresponding to the upper part of the pot wall is silicon dioxide, and the inner layer is composed of the following formulated 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 inner pot of the IH applicable electric appliance with an aluminum substrate in this comparative example 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 comparative example, in step S2, the cold spraying operation is carried out on all three areas of the pot body using the second silicon dioxide-coated powder mixture.

[0042] Comparative Example 2

[0043] The preparation method of the inner pot of the IH applicable electric appliance with an aluminum substrate in this comparative example 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 comparative example, the primary annealing treatment in step S3 and the secondary annealing treatment in step S5 are not carried out.

[0044] The aluminum substrate IH applicable inner pots prepared in Examples 1 to 3 and Comparative Examples 1 to 2 were subjected to performance tests, and the performance results are shown in Table 1:

[0045] Among them, for the performance test of heating efficiency, a standard IH heating device was used, 2 L of room temperature water was added, the time taken to heat to 100 °C was recorded, and the heating efficiency (°C / min) = (100 °C - room temperature) / heating time (min) was calculated.

[0046] For the performance test of abrasion resistance, a Taber abrasion tester was used to conduct abrasion tests on the surface of the sample with a CS-10 abrasion wheel, a load of 1000 g, and 1000 revolutions, and then the abrasion depth was measured with a profilometer.

[0047] For the performance test of easy cleanability, simulated stains were applied to the inner surface of the pot. After heating and drying, it was cleaned with a standard cleaner and a sponge for 5 minutes, and then the stain residue rate was evaluated with an optical microscope.

[0048] For the performance test of magnetic permeability, an electromagnetic induction tester was used to record the magnetic permeability of the sample at different magnetic field strengths at a test frequency of 50 Hz and calculate the average value. Table 1

[0049] The above has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A preparation method of an inner pot for an IH applicable electric appliance with an aluminum base material, characterized in that, The preparation method comprises the following steps: S1: Select aluminum material as the raw material of the pot body, and form it into a pot body structure including a bottom and a pot wall through a stamping process; clean, degrease and roughen the surface of the formed pot body; S2: Adopt a multi-channel powder conveying system and a dynamic mixer to respectively correspond to the bottom area, the lower part area of the pot wall and the upper part area of the pot wall with three different formulations of silica-coated powder mixtures, dynamically adjust the spraying position by combining an automated control system, and dynamically adjust the spraying parameters through a cold spraying process, and continuously spray a gradient distribution magnetic conduction layer from the center of the bottom to the upper part of the pot wall along the outer surface of the pot body pretreated in step S1; S3: Place the pot body completed in spraying in step S2 in a protective atmosphere, carry out a first annealing treatment, and then air-cool; S4: Deposit a ceramic coating easy-to-clean protective layer on the magnetic conduction layer on the outer surface of the pot body obtained in step S3; S5: Place the pot body obtained in step S4 in a protective atmosphere again, carry out a second annealing treatment, and then air-cool to obtain the aluminum substrate IH-applicable inner pot for electrical appliances.

2. The preparation method of the inner pot of the IH applicable electric appliance with an aluminum substrate as described in claim 1, characterized in that, The outer layer of the first silica-coated powder mixture corresponding to the bottom area is silica, and the inner layer is composed of the following components of formulation 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.

3. The preparation method of the IH applicable inner pot of the electric appliance with an aluminum substrate as claimed in claim 1, characterized in that, The outer layer of the second silica-coated powder mixture corresponding to the lower part area of the pot wall is silica, and the inner layer is composed of the following components of formulation 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.

4. The preparation method of the inner pot of the IH applicable electric appliance with an aluminum base material as described in claim 1, characterized in that The outer layer of the third silica-coated powder mixture corresponding to the upper part area of the pot wall is silica, and the inner layer is composed of the following components of formulation 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.

5. The preparation method of the inner pot of the IH applicable electric appliance with an aluminum substrate 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 the working gas of 1.5-2.5 MPa, and a working gas temperature of 200-400 °C.

6. The preparation method of the inner pot of the IH applicable electric appliance with an aluminum substrate as described in claim 1, characterized in that, The annealing temperature of the first annealing treatment is 480-520 °C, and the heat preservation time is 1-2 hours.

7. The preparation method of the IH-applicable inner pot of an electric appliance with an aluminum substrate as claimed in claim 1, wherein, The outer surface of the magnetic conduction layer is a nipple structure.

8. The preparation method of the inner pot of the IH applicable electric appliance with an aluminum substrate as described in claim 1, characterized in that, The annealing temperature of the second annealing treatment is 300-400 °C, and the heat preservation time is 2-4 hours.

9. An inner pot for IH-applicable electrical appliances with an aluminum substrate, characterized in that, The inner pot for electrical appliances is prepared by using the preparation method of the aluminum substrate IH-applicable inner pot for electrical appliances according to any one of claims 1-8.

10. Application of an aluminum substrate IH-applicable inner pot for electrical appliances according to claim 9 in kitchen utensils such as rice cookers or electric pressure cookers.

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