A high thermal efficiency double-bottom pot and manufacturing process

Abstract

The present invention discloses a double-bottom pot with high heat efficiency and a manufacturing process, which relates to the technical field of coatings. The double-bottom pot uses an iron layer as the induction layer, an aluminum layer as the rust-proof layer, and N-(2-acetaldehyde)-phthalimide modified graphene is used for the preparation of polytetrafluoroethylene composite powder, and then it is sprayed as an anti-corrosion layer. The obtained double-bottom pot has good wear resistance, corrosion resistance and heating uniformity; the present invention also further modifies polytetrafluoroethylene with cedrol, and the obtained modified polytetrafluoroethylene is used for the preparation of the double-bottom pot, so that the double-bottom pot has better wear resistance, corrosion resistance and heating uniformity.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and particularly relates to a double-bottomed pot with high thermal efficiency and a manufacturing process therefor. Background Art

[0002] At present, induction cookers have been widely used, and most families will prepare induction cookers for matching use. Especially in some single apartments, induction cookers are more used to replace traditional gas stoves. To meet the use on induction cookers, the supporting cookware must be attached with an induction sheet at the bottom to ensure that the cookware can be induced and heated on the induction cooker. The traditional double-bottom method mainly uses a double-striking method to double-strike a stainless steel sheet or an induction sheet at the bottom of the cookware to heat the pot body. However, both the stainless steel sheet and the induction sheet have low induction efficiency and low thermal efficiency, and even small-sized induction cannot induce heat generation. Moreover, the conventional double-bottom can only be made on the flat surface of the cookware, and cannot be made on the bottom surface of the pot with concave-convex patterns or arcs. The present invention designs and develops a double-bottomed pot with high thermal efficiency and a manufacturing process therefor. Based on the cold spraying process technology, using iron and aluminum as materials, first spray a layer of iron-based induction layer on the outer surface of the cookware, and then spray a layer of aluminum-based rust-proof layer on the outer surface of the induction layer; then spray a layer of anti-corrosion layer to further improve the performance of the double-bottomed pot. Summary of the Invention

[0003] The purpose of the present invention is to provide a double-bottomed pot with high thermal efficiency and a manufacturing process therefor. The double-bottomed pot prepared by this process has good wear resistance, corrosion resistance and heating uniformity.

[0004] The technical solution adopted by the present invention to achieve the above purpose is as follows:

[0005] A double-bottomed pot with high thermal efficiency, the double-bottomed pot includes a pot body; an induction layer, a rust-proof layer and an anti-corrosion layer are sequentially sprayed on the outer bottom surface of the pot body; the anti-corrosion layer includes a polytetrafluoroethylene composite layer; the polytetrafluoroethylene composite layer contains at least polytetrafluoroethylene and modified graphene; the modified graphene is prepared from N-(2-acetaldehyde)-phthalimide modified graphene.

[0006] For the present invention, the induction layer includes an iron layer, and the thickness of the induction layer is 0.25 - 0.35 mm.

[0007] For the present invention, the rust-proof layer includes an aluminum layer, and the thickness of the rust-proof layer is 0.18 - 0.23 mm.

[0008] For the present invention, the thickness of the polytetrafluoroethylene composite layer is 0.15 - 0.2 mm.

[0009] For the present invention, the outer bottom surface of the pot body is selected from one of a flat surface, an arc curved surface or a concave-convex textured pattern surface.

[0010] The present invention also discloses a manufacturing process for a double-bottom pot with high thermal efficiency, including: spraying an iron layer on the outer bottom surface of the pot body, then spraying an aluminum layer, performing surface roughening treatment, and then spraying a polytetrafluoroethylene layer, followed by drying and curing to obtain a double-bottom pot with high thermal efficiency.

[0011] Specifically, the manufacturing process for the double-bottom pot with high thermal efficiency includes the following steps:

[0012] Using cold spraying, under a pressure of 8.5 - 10 MPa, heating to 800 - 900 °C, and impacting and depositing iron particles on the outer bottom surface of the pot body at a speed of 800 - 1000 m / s to obtain an iron layer; then spraying and depositing an aluminum layer with aluminum particles using the same process, performing sandblasting surface roughening treatment, with a sandblasting time of 4 - 7 min and a sandblasting pressure of 0.15 - 0.35 MPa, and then spraying a polytetrafluoroethylene composite powder dispersion liquid under a pressure of 8.5 - 10 MPa, and curing at 280 - 350 °C for 2 - 2.5 h to obtain a double-bottom pot with high thermal efficiency.

[0013] For the present invention, the above-mentioned polytetrafluoroethylene composite powder dispersion liquid is prepared by adding polytetrafluoroethylene composite powder to absolute ethanol and stirring until evenly dispersed; the mass ratio of polytetrafluoroethylene composite powder to absolute ethanol is: 1:0.8 - 1.3.

[0014] For the present invention, the above-mentioned polytetrafluoroethylene composite powder contains polytetrafluoroethylene, modified graphene, silicon carbide, alumina, and silica.

[0015] For the present invention, in the above-mentioned polytetrafluoroethylene composite powder, by weight, the dosage of polytetrafluoroethylene is 90 - 95 parts; the dosage of modified graphene is 0.03 - 0.08 parts; the dosage of silicon carbide is 1 - 5 parts; the dosage of alumina is 1 - 4 parts; the dosage of silica is 1 - 4 parts.

[0016] For the present invention, the particle size of the above-mentioned polytetrafluoroethylene is 15 - 30 μm; the particle size of modified graphene is 20 - 30 nm; the particle size of silicon carbide is 10 - 30 nm; the particle size of alumina is 10 - 30 nm; the particle size of silica is 10 - 30 nm.

[0017] The present invention also discloses a preparation method for modified graphene, including: performing a Michael addition reaction between N-(2-acetaldehyde)-phthalimide and graphene to obtain modified graphene.

[0018] The present invention provides a method for preparing modified graphene. Using N-(2-acetaldehyde)-phthalimide as a modifier, the prepared modified graphene is used in the preparation of a multi-layer bottom pan, enabling the multi-layer bottom pan to have good wear resistance, corrosion resistance, and heating uniformity. The reason may be that N-(2-acetaldehyde)-phthalimide is conducive to the formation of a cross-linked network, which can endow the multi-layer bottom pan with good heating uniformity and corrosion resistance. In addition, due to the presence of structures such as benzene rings, the wear resistance of the multi-layer bottom pan is further enhanced.

[0019] Specifically, the method for preparing the above-mentioned modified graphene includes the following steps:

[0020] Under a nitrogen atmosphere, graphene oxide is kept at 800-1000 °C for 10-15 min, cooled to room temperature to obtain thermally reduced graphene oxide. The thermally reduced graphene oxide is added to a potassium hydroxide ethanol solution with a concentration of 0.15-0.25 mol / L, ultrasonically treated for 0.5-1 h, and then added to an N-(2-acetaldehyde)-phthalimide ethanol solution with a concentration of 45-60 g / L, reacted at 70-80 °C for 1.5-2.5 h, then cooled to room temperature, ultrasonically treated for 20-30 min and filtered, and successively filtered and washed with ethanol and acetone 3-5 times to obtain modified graphene.

[0021] For the present invention, the mass-volume ratio of the above-mentioned thermally reduced graphene oxide to the potassium hydroxide ethanol solution is: 1 g: 400-550 mL; the mass-volume ratio of the thermally reduced graphene oxide to the N-(2-acetaldehyde)-phthalimide ethanol solution is: 1 g: 400-550 mL.

[0022] The present invention also discloses the use of the modified graphene prepared by the above-mentioned preparation method in the production of a multi-layer bottom pan.

[0023] To further improve the performance of the multi-layer bottom pan, the present invention also modifies polytetrafluoroethylene.

[0024] The present invention also discloses a method for preparing modified polytetrafluoroethylene, including: graft-modifying polytetrafluoroethylene with cedrol to obtain modified polytetrafluoroethylene.

[0025] The present invention also provides a method for preparing modified polytetrafluoroethylene. Using cedrol as a modifier, the prepared modified polytetrafluoroethylene is used in the preparation of a multi-layer bottom pan, enabling the multi-layer bottom pan to have better wear resistance, corrosion resistance, and heating uniformity. The reason may be that a three-dimensional network structure is formed between cedrol and polytetrafluoroethylene, which is beneficial to the corrosion resistance and wear resistance of the multi-layer bottom pan. In addition, it may be that due to the presence of cycloalkyl structures in cedrol, the heat preservation effect of the multi-layer bottom pan is further promoted.

[0026] Specifically, the preparation method of the modified polytetrafluoroethylene comprises the following steps:

[0027] Soak polytetrafluoroethylene in acetone (mass volume ratio of polytetrafluoroethylene to acetone is: 1g:30-40mL) for 12-15h, dry to constant weight, add to the mixed solution of cedarene alcohol and 1,4-dioxane, then add ammonium ferrous sulfate and triallyl isocyanurate, and stir under nitrogen atmosphere. 60 Co is used as the irradiation source, a dose rate of 0.4-0.45 KGy / h is used for irradiation for 40-55 hours, acetone is used as the solvent and a Soxhlet extractor is used for extraction for 45-50 hours, the product is washed with deionized water and acetone, and dried to a constant weight to obtain modified polytetrafluoroethylene.

[0028] In the present invention, the mass ratio of the polytetrafluoroethylene to cedarwood alcohol is 1:1.3-1.6.

[0029] In the present invention, the mass ratio of the above-mentioned cedrene alcohol to 1,4-dioxane is 1:4-7.

[0030] In the present invention, the mass ratio of the above-mentioned cedrene alcohol to triallyl isocyanurate is: 1:0.15-0.17.

[0031] In the present invention, the concentration of the above-mentioned ammonium ferrous sulfate in the reaction solution is 2-3 wt %.

[0032] The invention also discloses the use of the modified polytetrafluoroethylene prepared by the preparation method in the production of a composite bottom pot.

[0033] The beneficial effects of the present invention include:

[0034] The present invention provides a high-thermal-efficiency composite-bottom pot and a manufacturing process. The composite-bottom pot uses an iron layer as an induction layer and an aluminum layer as an anti-rust layer. Graphene modified with N-(2-acetaldehyde)-phthalimide is used to prepare polytetrafluoroethylene composite powder, which is then sprayed as an anti-corrosion layer. The prepared composite-bottom pot has good wear resistance, corrosion resistance and heating uniformity. The present invention also uses cedarene alcohol to further modify the polytetrafluoroethylene, and the prepared modified polytetrafluoroethylene is then used to prepare the composite-bottom pot, so that the composite-bottom pot has better wear resistance, corrosion resistance and heating uniformity.

[0035] Therefore, the present invention provides a high-thermal-efficiency composite-bottom pot and a manufacturing process. The composite-bottom pot manufactured by the process has good wear resistance, corrosion resistance and heating uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of a composite bottom pot prepared in Example 1;

[0037] Figure 2 Test results of infrared spectra of the modified graphene and graphene prepared in Example 3;

[0038] Figure 3 Test results of infrared spectra of the modified polytetrafluoroethylene and polytetrafluoroethylene prepared in Example 4.

[0039] Reference numerals in the drawings: pot body 1, induction layer 2, rust-proof layer 3. Specific embodiments

[0040] To make the objectives, technical solutions and advantages of the present invention clearer and more definite, the following further describes the technical solutions of the present invention in detail in conjunction with specific embodiments:

[0041] Example 1:

[0042] A manufacturing process for a high-efficiency double-bottom pot, comprising the following steps:

[0043] Using cold spraying, at a pressure of 8.5 MPa, heated to 800 °C, iron particles are impacted and deposited on the outer bottom surface of the pot at a speed of 800 m / s to obtain an iron layer; then aluminum particles are sprayed and deposited to form an aluminum layer using the same process, thereby obtaining a high-efficiency double-bottom pot, as Figure 1 shown; wherein, the outer bottom surface of the pot is a flat surface, the thickness of the iron layer is 0.3 mm; the thickness of the aluminum layer is 0.2 mm.

[0044] Example 2:

[0045] The difference between a manufacturing process for a high-efficiency double-bottom pot and Example 1: preparing a polytetrafluoroethylene composite layer.

[0046] A manufacturing process for a high-efficiency double-bottom pot, comprising the following steps:

[0047] Using cold spraying, at a pressure of 8.5 MPa, heated to 800 °C, iron particles are impacted and deposited on the outer bottom surface of the pot at a speed of 800 m / s to obtain an iron layer; then aluminum particles are sprayed and deposited to form an aluminum layer using the same process, followed by sandblasting for surface roughening, with a sandblasting time of 5 min and a sandblasting pressure of 0.15 MPa, and then spraying a polytetrafluoroethylene composite powder dispersion liquid at a pressure of 8.5 MPa and curing at 300 °C for 2 h to obtain a high-efficiency double-bottom pot; wherein, the thickness of the iron layer is 0.3 mm; the thickness of the aluminum layer is 0.2 mm; the thickness of the polytetrafluoroethylene composite layer is 0.15 mm.

[0048] Preparation method of polytetrafluoroethylene composite powder dispersion liquid, comprising: adding polytetrafluoroethylene composite powder composed of polytetrafluoroethylene, graphene, silicon carbide, alumina, and silica into absolute ethanol, stirring and dispersing evenly to obtain polytetrafluoroethylene composite powder dispersion liquid; wherein, in the polytetrafluoroethylene composite powder, by weight, the dosage of polytetrafluoroethylene is 90 parts; the dosage of graphene is 0.03 parts; the dosage of silicon carbide is 1 part; the dosage of alumina is 1 part; the dosage of silica is 1 part; the particle size of the above-mentioned polytetrafluoroethylene is 20μm; the particle size of graphene is 20nm; the particle size of silicon carbide is 12nm; the particle size of alumina is 15nm; the particle size of silica is 18nm; the mass ratio of polytetrafluoroethylene composite powder to absolute ethanol is: 1:1.

[0049] Example 3:

[0050] The difference between the manufacturing process of a high thermal efficiency double-bottom pot and Example 2: The preparation method of the polytetrafluoroethylene composite powder dispersion liquid is different.

[0051] The difference between the preparation method of the polytetrafluoroethylene composite powder dispersion liquid and Example 2: Modified graphene is used to replace graphene.

[0052] Preparation method of modified graphene, comprising the following steps:

[0053] Under a nitrogen atmosphere, graphene oxide is kept at 800°C for 15 minutes and cooled to room temperature to obtain thermally reduced graphene oxide; the thermally reduced graphene oxide is added to a potassium hydroxide ethanol solution with a concentration of 0.15 mol / L, ultrasonicated for 1 hour, then added to an N-(2-acetaldehyde)-phthalimide ethanol solution with a concentration of 45 g / L, reacted at 70°C for 2.5 hours, then cooled to room temperature, ultrasonicated for 30 minutes and filtered, and successively filtered and washed 3 times with ethanol and acetone to obtain modified graphene; wherein, the mass-volume ratio of thermally reduced graphene oxide to potassium hydroxide ethanol solution is: 1g:400mL; the mass-volume ratio of thermally reduced graphene oxide to N-(2-acetaldehyde)-phthalimide ethanol solution is: 1g:400mL.

[0054] Example 4:

[0055] The difference between the manufacturing process of a high thermal efficiency double-bottom pot and Example 3: The preparation method of the polytetrafluoroethylene composite powder dispersion liquid is different.

[0056] [[ID=Z4]]The difference between the preparation method of the polytetrafluoroethylene composite powder dispersion liquid and Example 3: Modified polytetrafluoroethylene is used to replace polytetrafluoroethylene.

[0057] Preparation method of modified polytetrafluoroethylene, comprising the following steps:

[0058] Polytetrafluoroethylene was soaked in acetone (the mass volume ratio of polytetrafluoroethylene to acetone was 1 g: 30 mL) for 15 h, dried to constant weight, added to a mixed solution of cedrene alcohol and 1,4-dioxane, and then added with ammonium ferrous sulfate and triallyl isocyanurate. 60 Co was used as the irradiation source, and the irradiation was carried out at a dose rate of 0.4 KGy / h for 55 hours. The product was extracted with acetone by a Soxhlet extractor for 45 hours, washed with deionized water and acetone, and dried to a constant weight to obtain modified polytetrafluoroethylene. The mass ratio of polytetrafluoroethylene to cedrene alcohol was 1:1.3; the mass ratio of cedrene alcohol to 1,4-dioxane was 1:4; the mass ratio of cedrene alcohol to triallyl isocyanurate was 1:0.15; and the concentration of ammonium ferrous sulfate in the reaction solution was 2 wt%.

[0059] Example 5:

[0060] The difference between the manufacturing process of a high thermal efficiency composite bottom pot and Example 2 is that the preparation method of the polytetrafluoroethylene composite powder dispersion is different.

[0061] The difference between the preparation method of the polytetrafluoroethylene composite powder dispersion and Example 2 is that modified polytetrafluoroethylene is used instead of polytetrafluoroethylene.

[0062] The preparation method of modified polytetrafluoroethylene is the same as that in Example 4.

[0063] Test example:

[0064] 1. Infrared spectrum test

[0065] The infrared spectrometer of PerkinElmer was used to test the samples in the wavelength range of 4000-400 cm -1 .

[0066] The modified graphene and thermally reduced graphene oxide prepared in Example 3 were tested as above, and the results are as follows: Figure 2 As shown. Figure 2 It can be seen that compared with the infrared spectrum of graphene, the infrared spectrum of modified graphene is at 1408cm -1 There is an infrared characteristic absorption peak of CN at , indicating that N-(2-acetaldehyde)-phthalimide participates in the formation reaction of modified graphene.

[0067] The modified polytetrafluoroethylene and polytetrafluoroethylene prepared in Example 4 were tested as above, and the results are as follows: Figure 3 As shown. Figure 3 It can be seen that compared with the infrared spectrum of polytetrafluoroethylene, the infrared spectrum of modified polytetrafluoroethylene is at 3473cm -1 The presence of the infrared characteristic absorption peak of hydroxyl group indicates that cedrene alcohol participates in the formation reaction of modified polytetrafluoroethylene.

[0068] 2. Wear resistance performance test

[0069] The friction coefficient of the sample was tested using a WTM-2E controlled atmosphere micro friction and wear tester.

[0070] Table 1 Wear resistance performance test results

[0071] Experimental grouping Coefficient of friction Example 1 0.51 Example 2 0.43 Example 3 0.37 Example 4 0.28 Example 5 0.35

[0072] The above tests were carried out on the multi-bottom pans prepared in Examples 1-5, and the results are shown in Table 1. It can be seen from Table 1 that compared with Example 1, the friction coefficient of Example 2 decreased significantly, indicating that the polytetrafluoroethylene composite layer has a promoting effect on the wear resistance performance of the multi-bottom pan; compared with Example 2 for Example 3, and Example 5 for Example 4, the friction coefficient decreased to some extent, indicating that after N-(2-acetaldehyde)-phthalimide modified graphene, the modified graphene was used in the preparation of the multi-bottom pan, making the multi-bottom pan have good wear resistance performance; compared with Example 2 for Example 5, and Example 3 for Example 4, the friction coefficient decreased in both cases, indicating that after cedrol modified polytetrafluoroethylene, the modified polytetrafluoroethylene was used in the preparation of the multi-bottom pan, making the multi-bottom pan have good wear resistance performance.

[0073] 3. Corrosion resistance performance test

[0074] A 5wt% NaCl solution was used as the corrosion medium, with a flow rate of 1m / s, a temperature of 50°C, and a sample corrosion time of 336h. The corrosion rate was measured by the weight loss method.

[0075] Table 2 Corrosion resistance performance test results

[0076] Experimental grouping <![CDATA[Corrosion rate / g•m -2 •h -1 > Example 1 0.152 Example 2 0.108 Example 3 0.094 Example 4 0.087 Example 5 0.071

[0077] The above tests were carried out on the multi-bottom pans prepared in Examples 1-5, and the results are shown in Table 2. It can be seen from Table 2 that compared with Example 1, the corrosion rate of Example 2 decreased significantly, indicating that the polytetrafluoroethylene composite layer has a promoting effect on the corrosion resistance performance of the multi-bottom pan; compared with Example 2 for Example 3, and Example 5 for Example 4, the corrosion rate decreased to some extent, indicating that after N-(2-acetaldehyde)-phthalimide modified graphene, the modified graphene was used in the preparation of the multi-bottom pan, making the multi-bottom pan have good corrosion resistance performance; compared with Example 2 for Example 5, and Example 3 for Example 4, the corrosion rate decreased in both cases, indicating that after cedrol modified polytetrafluoroethylene, the modified polytetrafluoroethylene was used in the preparation of the multi-bottom pan, making the multi-bottom pan have good corrosion resistance performance.

[0078] 4. Heating uniformity

[0079] At the same room temperature, control the flame size to be the same, heat the sample of the multi-bottom pot, and use an infrared thermometer to measure the temperature at the center of the multi-bottom pot. Record the temperature difference change per minute within 5 minutes, and calculate the average temperature change difference.

[0080] Table 3 Test Results of Heating Uniformity

[0081] Experimental grouping Average difference in temperature change Example 1 3.8 Example 2 3.1 Example 3 2.6 Example 4 1.8 Example 5 2.4

[0082] Perform the above tests on the multi-bottom pots prepared in Examples 1 - 5, and the results are shown in Table 3. It can be seen from Table 3 that compared with Example 1, the average temperature change difference of Example 2 decreases significantly, indicating that the polytetrafluoroethylene composite layer has a promoting effect on the heating uniformity of the multi-bottom pot; compared with Example 2, the average temperature change difference of Example 3 decreases, and compared with Example 5, the average temperature change difference of Example 4 decreases, indicating that after modifying graphene with N-(2-acetaldehyde)-phthalimide and using the modified graphene in the preparation of the multi-bottom pot, the multi-bottom pot has good heating uniformity; compared with Example 2, the average temperature change difference of Example 5 decreases, and compared with Example 3, the average temperature change difference of Example 4 decreases, indicating that after modifying polytetrafluoroethylene with cedrol and using the modified polytetrafluoroethylene in the preparation of the multi-bottom pot, the multi-bottom pot has good heating uniformity.

[0083] The conventional technologies in the above examples are the existing technologies known to those skilled in the art, so they will not be described in detail here.

[0084] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A double-bottomed pot with high thermal efficiency, characterized in that, The double-bottomed pot includes a pot body; an induction layer, an anti-rust layer, and an anti-corrosion layer are sequentially sprayed on the outer bottom surface of the pot body; the anti-corrosion layer includes a polytetrafluoroethylene composite layer; the polytetrafluoroethylene composite layer contains at least modified polytetrafluoroethylene and modified graphene; the modified graphene is prepared from N-(2-acetaldehyde)-phthalimide modified graphene; N-(2-acetaldehyde)-phthalimide and ethanol are mixed to obtain an N-(2-acetaldehyde)-phthalimide ethanol solution, and the mass-volume ratio of thermally reduced graphene oxide to the N-(2-acetaldehyde)-phthalimide ethanol solution with a concentration of 45-60 g / L is: 1 g: 400-550 mL; Soak polytetrafluoroethylene in acetone for 12 - 15 h, dry it to constant weight, add it to the mixed solution of cedrol and 1,4 - dioxane, then add ammonium ferrous sulfate and triallyl isocyanurate. Under a nitrogen atmosphere, 60 using Co as the irradiation source, irradiate at a dose rate of 0.4 - 0.45 KGy / h for 40 - 55 h, extract with a Soxhlet extractor using acetone as the solvent for 45 - 50 h, wash with deionized water, wash with acetone, and dry to constant weight to obtain modified polytetrafluoroethylene; the mass - volume ratio of polytetrafluoroethylene to acetone is: 1 g: 30 - 40 mL; the induction layer contains an iron layer, the thickness of the induction layer is 0.25 - 0.35 mm, the rust - proof layer contains an aluminum layer, and the thickness of the rust - proof layer is 0.18 - 0.23 mm.

2. The highly efficient double-bottom pot according to claim 1, wherein: The outer bottom surface of the pot body is selected from one of a plane, an arc-shaped curved surface, or a patterned surface with concave and convex textures.

3. A manufacturing process for a double-bottom pot, which is used to manufacture the high-efficiency double-bottom pot as described in claim 1, and is characterized in that: Spray an iron layer on the outer bottom surface of the pot, then spray an aluminum layer, perform a texturing treatment, and then spray a polytetrafluoroethylene layer and dry and cure it to obtain a double-bottomed pot with high thermal efficiency.

4. The production process of the double-bottom pot according to claim 3, characterized in that: The spraying processes of the iron layer and the aluminum layer are both cold spraying.

5. The manufacturing process of the double-bottom pot according to claim 4, characterized in that: The process conditions of the cold spraying are: pressure 8.5-10 MPa, temperature 800-900 °C.

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