Cookware with good ductility and cracking resistance and preparation method thereof

Abstract

The invention discloses a pot with good ductility and cracking resistance and a preparation method thereof, and belongs to the field of household appliances. The cookware comprises a cookware base body and a meltallizing layer with the thickness of 20-150 microns, and the meltallizing layer is meltallizing from meltallizing raw materials to the inner surface of the cookware base body; the meltallizing layer comprises, by weight, A% wt of Ti, B% wt of O and C% wt of ductile elements, and (A + C) / B is larger than or equal to 1.2 and smaller than or equal to 2.5; wherein the hardness of the meltallizing layer is larger than that of the cookware base body, and the ductility of a simple substance formed by the ductility elements is better than that of the meltallizing layer. The ductility element is added into the meltallizing layer of the cookware, and (A + C) / B is controlled to be larger than or equal to 1.2 and smaller than or equal to 2.5, so that the ductility and the cracking resistance of the meltallizing layer can be improved, meanwhile, the corrosion resistance of the cookware is improved, and the service life of the cookware is prolonged.

Description

Technical Field

[0001] The present application relates to a cookware with good ductility and crack resistance and a preparation method thereof, belonging to the field of household appliances. Background Art

[0002] Due to the impact of the EU fluorine ban, there has been a wave of 0 coatings dominated by melt spraying technology in China. Melt spraying is to melt the corresponding material powder or silk thread at high temperature and spray it onto the inner surface of the pot body with high-pressure gas. After stacking and condensing, a layer of non-chemical coating is formed, which improves the hardness, wear resistance, corrosion resistance and other properties of the original base material of the pot.

[0003] However, during use, hard objects such as spatulas or ingredients will often knock against the surface covering layer. Currently, the main base material of the covering layer is titanium, but due to its low hardness and weak resistance to steel spatulas, it is easily scratched by the impact of steel spatulas during use, affecting the life of the pot. If other hard materials are used, although the problem of easy scratches can be avoided, the resulting covering layer will be hard and lack ductility. After external impact or rapid cooling, it will cause brittle cracking and failure. Summary of the invention

[0004] In order to solve the above problems, a cookware with good ductility and crack resistance and a preparation method thereof are provided. The sprayed layer of the cookware contains A%wt Ti, B%wt O and C%wt ductile elements. By adding ductile elements and controlling 1.2≤(A+C) / B≤2.5, the ductility and crack resistance of the sprayed layer can be improved while the corrosion resistance of the cookware can be improved, thereby extending the service life of the cookware.

[0005] According to one aspect of the present application, there is provided a cookware with good ductility and crack resistance, comprising a cookware base body and a sprayed layer with a thickness of 20-150 μm, wherein the sprayed layer is sprayed from a sprayed raw material onto the inner surface of the cookware base body;

[0006] The sprayed layer contains A%wt Ti, B%wt O and C%wt ductile elements in parts by weight, 1.2≤(A+C) / B≤2.5;

[0007] The hardness of the sprayed layer is greater than the hardness of the cookware substrate, and the ductility of the single substance formed by the ductile element is better than the ductility of the sprayed layer.

[0008] The oxide formed by O element and Ti has higher hardness and can effectively improve the hardness and thus improve the wear resistance.

[0009] In the present application, adding ductile elements to the 20-150μm thick sprayed layer formed by titanium and oxygen elements can give the sprayed layer good ductility, improve the cracking resistance of the cookware under external impact or rapid cooling, and achieve a dual improvement in cracking resistance and corrosion resistance within the range of 1.2≤(A+C) / B≤2.5, significantly extending the service life of the cookware.

[0010] If (A+C) / B is less than 1.2, the ductility of the sprayed layer will be insufficient, and there will still be the problem of easy cracking due to external influences. If (A+C) / B is greater than 2.5, it will not only increase the cost of the cookware, but also reduce the corrosion resistance of the cookware, which will reduce the service life of the cookware.

[0011] If the thickness of the sprayed layer is too thin, the protection of the cookware will be insufficient, the wear resistance of the cookware will be reduced, and the ductile elements in the sprayed layer will not play a good role. Even within the range of 1.2≤(A+C) / B≤2.5, the anti-cracking and corrosion resistance of the cookware cannot be met; if the thickness of the sprayed layer is too thick, the overall weight of the sprayed layer is large, and the sprayed layer is easy to fall off when impacted, which in turn leads to a decrease in impact resistance.

[0012] Optionally, the ductile element is selected from at least one of Ti, Al, and Fe, and when the ductile element is Ti, the ductile element exists in the sprayed layer in a single substance form.

[0013] Optionally, the sprayed layer contains titanium dioxide and a ductile component;

[0014] Wherein, the ductile component is selected from at least one of titanium, aluminum, stainless steel and iron.

[0015] The above-mentioned ductile component can be well bonded with the titanium dioxide substrate, and the thermal expansion coefficient of the above-mentioned ductile component is similar to that of a general cookware substrate, which helps to improve the bonding strength with the cookware substrate, thereby reducing the difference in thermal expansion coefficients between the cookware substrate and the sprayed layer, thereby preventing the sprayed layer from falling off and bubbling when the cookware is subjected to high temperature or rapid temperature drop, further extending the service life of the cookware and improving the safety of the cookware.

[0016] Optionally, the cookware further comprises a protective layer, and the protective layer is connected to the surface of the sprayed layer;

[0017] Among them, the protective layer raw material includes a wear-resistant component, a corrosion-resistant component, and an adjusting component. The hardness of the wear-resistant component is greater than the hardness of the sprayed layer; the corrosion resistance of the corrosion-resistant component is better than that of the wear-resistant component and the adjusting component; the ductility of the adjusting component is better than that of the wear-resistant component and the corrosion-resistant component.

[0018] The protective layer can cover the sprayed layer, thereby further improving the wear resistance, corrosion resistance and cracking resistance of the cookware. Since the ductility of the regulating component is better than that of the wear-resistant component and the corrosion-resistant component, it can play a role in improving the ductility of the protective layer in the protective layer, and combined with the ductile elements in the sprayed layer, it can improve the bonding strength between the sprayed layer and the protective layer to avoid delamination; secondly, it can reduce the difference in ductility between the sprayed layer and the protective layer, and can buffer and absorb the force layer by layer when the cookware is impacted by external force, thereby synergistically reducing the cracking and impact resistance of the cookware. In addition, given that the sprayed layer formed under the existing spraying process is often a porous structure, some objects may penetrate or embed during use, resulting in problems such as easy discoloration, difficulty in cleaning or sticking to the pot. After the sprayed layer is covered with a protective layer, some holes can be filled, making the inner surface of the cookware smoother and making it difficult for objects to penetrate into the sprayed layer, which helps to improve anti-discoloration performance, easy cleaning and non-stick properties.

[0019] Optionally, the wear-resistant component includes at least one of silicon dioxide, aluminum oxide, and zirconium oxide;

[0020] The corrosion-resistant component is selected from at least one of titanium and titanium dioxide;

[0021] The regulating component is selected from at least one of iron and iron oxide.

[0022] The above-mentioned wear-resistant components are selected to have sufficient hardness, which can effectively improve the performance of the protective layer to resist steel shovels, thereby improving wear resistance. At the same time, the above-mentioned ingredients are elements that are friendly to the human body. Even if some of them are scraped off and mixed into food and enter the human body, they will not react in the human body to produce harmful substances, so the impact on health is small. The above-mentioned corrosion-resistant components are selected to have good acid corrosion resistance, so that the protective layer can withstand conventional acidic food cooking conditions to protect the pot body. Moreover, the thermal expansion coefficient of the selected titanium and titanium dioxide is close to that of the sprayed layer, which reduces the stress caused by heating or rapid cooling of the pot and avoids delamination. The above-mentioned adjustment components are selected to adjust the physical properties of the protective layer such as ductility and thermal expansion coefficient, so that the protective layer has better toughness, and the thermal expansion coefficient of the protective layer is close to that of the pot body and the sprayed layer, thereby making the connection between the protective layer and the sprayed layer more firm and reliable.

[0023] Preferably, the protective layer includes 30-50 parts of SiO2, 5-10 parts of aluminum oxide, 1-5 parts of Fe2O3, 1-5 parts of ZrO2, 5-20 parts of TiO2, and 5-10 parts of solvent.

[0024] According to another aspect of the present application, a method for preparing a cookware having good ductility and crack resistance as described in any one of the above items is provided, comprising the following steps:

[0025] (1) Sandblasting the base of the cookware;

[0026] (2) spraying the spraying raw material onto the inner surface of the pot substrate after sandblasting to form a spraying layer;

[0027] (3) polishing the sprayed layer to obtain the cookware;

[0028] The spraying raw material includes 80-95 parts of wear-resistant powder and 5-20 parts of ductile powder.

[0029] Sandblasting the base of the cookware can enhance the adhesion of the sprayed materials on the surface of the cookware base. Polishing after spraying is to reduce the roughness of the cookware surface to avoid excessive noise when cooking and sticking of the spatula due to the inner wall being too rough.

[0030] Optionally, the roughness of the inner surface of the cookware substrate after sandblasting is 2-8 μm.

[0031] Sandblasting can improve the adhesion of the sprayed material on the cookware base, thereby improving the bonding strength between the sprayed layer and the cookware base.

[0032] Optionally, before the sandblasting, the cookware base body is further subjected to the steps of pickling and degreasing and washing with clean water for several times, which can ensure that the oil stains and impurities on the surface of the cookware base body are cleaned.

[0033] Optionally, in step (2), the current of the spraying is 240-680A and the voltage is 22-68V.

[0034] Preferably, the current of the spraying in step (2) is 500-680A and the voltage is 55-68V.

[0035] The spraying current and voltage are determined based on the melting point of the powder. The spraying current and voltage vary according to the different spraying raw materials. The main purpose is to facilitate the full melting of the spraying raw materials, so as to avoid the accumulation of raw powder on the pot body substrate, resulting in poor bonding between the raw material powders and the easy falling off of the spraying layer. The above current and voltage can make the powder completely melted for spraying. If the current or voltage is too low, the powder will not be completely melted, and the solid particles will affect the adhesion of the spraying layer after being sprayed on the pot blank; if the current or voltage is too high, it is easy to cause the powder to burn and form a solid oxide with a higher melting point, which will affect the composition of the spraying layer and the adhesion, and the energy consumption is also high.

[0036] Optionally, the particle size of the wear-resistant powder and the ductile powder is 170μm to 300μm. In these embodiments, within this particle size range, the probability of combustion can be low while maintaining the spraying effect. Specifically, if the particle size is too large, the problem of incomplete melting of the powder may occur, so that part of the incompletely melted solid powder may be directly sprayed on the pot body during subsequent spraying, and the spraying is formed by spraying the molten raw material on the pot body, and the molten raw material is cooled and deposited on the surface of the object. The solid raw material cannot be deposited on the pot body by this principle, so this part of the solid raw material will affect the connection stability between the spraying layer and the pot body. When the particle size is too small, the powder may directly burn violently at high temperature, which will also affect the subsequent adhesion effect. Controlling the particle size of the spraying material to 170μm to 300μm can help alleviate the above two problems and improve the effect of spraying.

[0037] Optionally, the surface roughness of the melt-sprayed layer after polishing is 2-6 μm. When the cookware is only covered with the melt-sprayed layer, this surface roughness can improve the usability of the cookware and avoid sticking when cooking, and when the protective layer is formed, the melt-sprayed layer and the protective layer can have sufficient bonding force to prevent the protective layer from falling off easily.

[0038] Optionally, the thickness of the cookware base is 2.2-3mm, and the material of the cookware base is composite steel. For example, the composite steel can be a steel-aluminum composite steel, which is composited by a steel plate and an aluminum plate, wherein the aluminum plate has a lower density, so that the composite steel can be lighter, thereby making the cookware base lighter and easier to use. At the same time, the stainless steel plate as the outer layer can exert better rust and corrosion resistance. In summary, the steel-aluminum composite steel can have the advantages of rust resistance and light weight. In some other embodiments, the composite steel can also be a composite plate made of steel and other metal materials that can be used in the field of food equipment, so as to have both the rust resistance of steel and the excellent properties of other metal materials.

[0039] Optionally, step (3) further comprises the step of forming a protective layer on the surface of the sprayed layer after polishing;

[0040] The protective layer includes a wear-resistant component, a corrosion-resistant component, and an adjusting component. The hardness of the wear-resistant component is greater than the hardness of the sprayed layer; the corrosion resistance of the corrosion-resistant component is better than that of the wear-resistant component and the adjusting component; and the ductility of the adjusting component is better than that of the wear-resistant component and the corrosion-resistant component.

[0041] Optionally, the protective layer is formed by:

[0042] The cookware with the sprayed layer is preheated to 300-350°C for sandblasting, cooled, and then preheated to 30°C-55°C to mix the components of the protective layer in a solvent, which is then sprayed on the surface of the sprayed layer and sintered and cured at 350°C-500°C to form the protective layer.

[0043] In the process of forming the protective layer, the cookware with the sprayed layer is preheated to 300-350℃ for sandblasting, which can improve the surface roughness of the sprayed layer, facilitate the adhesion of the protective layer components, and improve the bonding strength between the two layers; secondly, reduce the temperature difference between the sprayed layer and the raw materials for sandblasting, reduce the stress caused by the temperature difference during the spraying process, thereby reducing the possibility of cracking caused by excessive instantaneous temperature difference, improve the bonding strength and self-strength of the coating, reduce the generation of cracks, and also avoid the surface temperature of the sprayed layer being too low, resulting in rapid solidification of the coating. The third is to improve the compatibility of the ductile powder and the components in the protective layer, thereby synergistically improving the corrosion resistance, crack resistance and high wear resistance of the cookware; the fourth is that preheating can remove moisture from the surface of the substrate and activate the surface, which is beneficial to the bonding of the coating and the substrate, as well as controlling the thermal expansion of the substrate relative to the coating; the fifth is that preheating can also reduce the stress caused by the inconsistency of shrinkage of the surface and coating during spraying and cooling, thereby improving the durability of the cookware.

[0044] The components of the protective layer are sintered at 350-500℃. On the one hand, the protective layer is completely sintered at a fast rate to ensure production efficiency, and the short-term sintering is also easy to control, which prevents the protective layer from being placed in a high-temperature environment for a long time due to excessive evaporation of water, thereby helping to limit the cracking of the protective layer and the loss of its protective effect. On the other hand, 350-500℃ is the high temperature limit that cookware may face in normal use scenarios, and qualified cookware produced at this temperature has also proven to be able to withstand high temperatures.

[0045] Optionally, when the components of the protective layer are mixed in a solvent, the wear-resistant component is 35-60 parts, the corrosion-resistant component is 5-15 parts, the regulating component is 3-12 parts, and the solvent is 5-10 parts by weight.

[0046] The wear-resistant component, which accounts for a relatively large proportion, can maintain sufficient hardness on the surface of the protective layer, so that the protective layer also has good wear and scratch resistance. At the same time, limiting the upper limit of the wear-resistant component also helps to prevent the hardness of the protective layer from being too high, so that the protective layer has a certain toughness and is not easy to crack; the corrosion-resistant component makes the protective layer have a certain corrosion resistance, which helps to improve the protective effect on the cookware base; the adjusting component is mainly used to adjust the thermal expansion coefficient of the protective layer, so that the thermal expansion coefficient of the protective layer is closer to the sprayed layer.

[0047] The above-mentioned solvent can be an ethanol solution or the like. The specific solvent selected is determined according to the properties of each component, as long as it is a solvent in which each component can be dissolved.

[0048] The beneficial effects of this application include but are not limited to:

[0049] 1. According to the cookware with good ductility and crack resistance of the present application, under a given thickness of the sprayed layer, by controlling the ratio of the sum of the titanium element and the ductility element to the oxygen element in the sprayed layer within the range of 1.2-2.5, it is possible to improve the ductility and crack resistance of the sprayed layer while reducing the production cost of the cookware, improving the corrosion resistance of the cookware, and extending the service life of the cookware.

[0050] 2. According to the cookware with good ductility and crack resistance of the present application, the ductile component can be well combined with the titanium dioxide substrate, thereby improving the density of the sprayed layer and reducing the difference in thermal expansion coefficients between the cookware substrate and the sprayed layer, thereby preventing the sprayed layer from falling off and bubbling when the cookware is subjected to high temperature or rapid cooling.

[0051] 3. According to the cookware with good ductility and crack resistance of the present application, the protective layer provided on the sprayed layer can protect the sprayed layer, and further enhance the ductility of the cookware, and improve the impact resistance of the cookware when subjected to external force. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0053] Figure 1 It is a half-section schematic diagram of the cookware involved in the embodiment of the present application.

[0054] Figure 2 for Figure 1 A partial schematic diagram of part A.

[0055] Figure 3 Schematic diagram of the cookware 1-2# whose sprayed layer does not fall off after the steel ball impact test.

[0056] Figure 4 Schematic diagram of comparison cookware D1# with the sprayed layer falling off after the steel ball impact test.

[0057] List of parts and reference numerals:

[0058] 1. Cookware base; 2. Spraying layer; 3. Protective layer. DETAILED DESCRIPTION

[0059] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0060] Unless otherwise specified, the raw materials in the examples of this application were purchased through commercial channels.

[0061] Unless otherwise specified, the methods used in the embodiments of the present application are conventional methods in the prior art.

[0062] Example 1

[0063] refer to Figure 1 , 2 The present embodiment relates to a method for preparing a pot with good ductility and crack resistance and a pot with good ductility and crack resistance prepared therefrom, the method comprising the following steps:

[0064] (1) A composite steel disc with a thickness of 3 mm is used as a substrate to form a pot blank by deep drawing to obtain a pot base 1, followed by pickling and degreasing and multiple water washing, and then sandblasting the pot base 1;

[0065] (2) spraying the spraying raw material onto the inner surface of the cookware base 1 after sandblasting to form a spraying layer 2;

[0066] (3) The heat-sprayed layer 2 is polished to obtain the cookware.

[0067] The cookware in Table 1 was prepared according to the above preparation method, and the specific differences are shown in Table 1.

[0068] Table 1

[0069]

[0070]

[0071] The comparison cookware D5# in Table 1 does not contain a sprayed layer, so there is no sprayed voltage and current, (A+C) / B value and sprayed layer thickness, and "-" is also used instead.

[0072] It should be noted that although the raw materials of the above-mentioned pots 1-2# to 1-7# are the same, due to the complex spraying conditions, the degree of oxidation of the materials during spraying will be different, so (A+C) / B will also be different. From the energy spectrum analysis results of the example, it can be seen that after the spraying of the raw materials of 80 parts of TiO2 and 20 parts of Ti powder, the value of (A+C) / B is about 1.6-2.1, which is within the range of 1.2-2.5; and when other powder ratios are used (such as pots 3-1# and pots 2-3#), (A+C) / B can reach the endpoint value after spraying.

[0073] Test Example 1

[0074] The following tests were performed on the cookware prepared in Example 1. The test results are shown in Table 2.

[0075] 1. Anti-cracking and ductility: Use a 228g steel ball to fall freely from a height of 1.5m and hit the cladding layer of the cookware. Take the center of the bottom of the pot as the center of the circle and take 5 points on any radius for testing to check the cracking and shedding of the cladding layer at the 5 test points.

[0076] 2. Corrosion resistance: Salt spray test. The specific steps can be referred to the national standards and will not be repeated here.

[0077] 3. Thermal shock test: Place the sample on an induction cooker and heat it to 400°C, take it out and immerse it in room temperature water to cool it down for 1 minute. Repeat the above steps 50 times, and use the presence or absence of the sprayed layer falling off as the standard.

[0078] 4. Abrasion resistance test: Use a steel wool to wipe the surface of the sample with a pressure of 20N, repeat 10 times. After that, wipe the surface of the sample with a white paper towel. If the white paper towel changes color obviously, it means that the sprayed layer has obviously fallen off and cannot pass the abrasion resistance test.

[0079] Table 2

[0080]

[0081]

[0082] Since the comparative cookware D5# does not contain a sprayed layer, the crack resistance and ductility and thermal shock tests in Table 2 do not exist. Figure 3 This is a schematic diagram of the pot 1-2# whose sprayed layer does not fall off after the steel ball impact test. Figure 4 Schematic diagram of the comparison cookware D1# with the sprayed layer falling off after the steel ball impact test. Figure 3-4 From the data in Table 2, it can be seen that adding ductile elements to the sprayed layer and the ductile elements are in the range of 1.2≤(A+C) / B≤2.5 can not only improve the ductility and crack resistance of the sprayed layer, but also make the cookware have several times the corrosion resistance of the comparison cookware D5#, thereby extending the service life of the cookware.

[0083] In the wear resistance test results of Table 2, no obvious discoloration or slight discoloration are both within the normal range. The improvement in wear resistance of the present application is mainly achieved based on the titanium dioxide added to the sprayed layer. According to cookware 1-1# to 1-3#, as the content of ductile elements increases, the proportion of titanium dioxide in the sprayed layer decreases, resulting in a decrease in the hardness of the sprayed layer, which in turn reduces the wear resistance. Therefore, the above data show that the ductile elements in the sprayed layer can still enable the cookware to maintain the required wear resistance within the range of 1.2≤(A+C) / B≤2.5. If there are too many ductile elements, the wear resistance of the sprayed layer will decrease. In contrast, cookware D5# does not contain a sprayed layer, and its wear resistance is significantly reduced, which cannot meet the needs of normal use.

[0084] Based on the test results of crack resistance and ductility, according to the comparison of cookware 1-1#, 1-4#~1-7#, it can be seen that the thickness of the sprayed layer mainly affects whether the sprayed layer falls off in the steel ball test. The thicker the sprayed layer, the easier it is to fall off in the test, and the thinner the sprayed layer, the less likely it is to fall off in the test. However, according to the comparison of cookware 1-1# and 1-7#, it can be seen that a too thin sprayed layer will lead to a decrease in its corrosion resistance. Therefore, the thickness of the sprayed layer needs to be within an appropriate range, preferably 20-150μm.

[0085] Example 2

[0086] refer to Figure 1-2 The cookware of this embodiment, based on the cookware of embodiment 1, further includes the step of forming a protective layer 3 on the surface of the sprayed layer 2: preheating the cookware with the sprayed layer 2 to 300-350°C for sandblasting, cooling, and then preheating to 30°C-55°C to mix the components of the protective layer 3 in a solvent, and then spraying it on the surface of the sprayed layer 2, and sintering and curing at 350°C-500°C to form the protective layer 3.

[0087] After adding a protective layer on the surface of the sprayed layer, the cookware's resistance to cracking can be improved. The salt spray test can ensure that it will not rust for 24 hours, and the non-stick property can reach the national standard level II non-stick property. Cookware that has not been added with a protective layer before needs to be coated with oil on the surface to achieve non-stick properties.

[0088] When there are too many wear-resistant components in the protective layer, the hardness of the protective layer will be too high, reducing the cookware's anti-cracking performance; the corrosion-resistant components only need to meet the requirements. Too many corrosion-resistant components will affect the proportion of the wear-resistant components and reduce wear resistance; the adjusting components are used to adjust the anti-cracking performance. If the number is too much, it will affect the wear resistance.

[0089] Currently, the optimal ratio of the protective layer is 30-50 parts of SiO2, 5-10 parts of alumina, 1-5 parts of Fe2O3, 1-5 parts of ZrO2, 5-20 parts of TiO2, and 5-10 parts of solvent.

[0090] By providing a protective layer, the corrosion resistance of the embodiment can be improved to no rust in a salt spray test for more than 24 hours. This is because the protective layer can effectively cover some holes on the surface of the spray layer 2, reducing the penetration of corrosive liquids, thereby improving corrosion resistance. In addition, the silicon components contained in the protective layer can generate anti-stick materials with low surface energy after being dissolved in the solvent, thereby improving the non-stickiness of the surface.

[0091] The above is only the embodiment of the present application, and the protection scope of the present application is not limited by these specific embodiments, but is determined by the claims of the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the technical ideas and principles of the present application should be included in the protection scope of the present application.

Claims

1. A cookware with good ductility and crack resistance, characterized in that: The invention comprises a cookware base body and a spraying layer with a thickness of 20-150 μm, wherein the spraying layer is sprayed from a spraying raw material onto the inner surface of the cookware base body; The sprayed layer contains A%wt of Ti element, B%wt of O element and C%wt of ductile element in parts by weight, 1.2≤(A+C) / B≤2.5; The hardness of the sprayed layer is greater than the hardness of the cookware substrate, and the ductility of the single substance formed by the ductile element is better than the ductility of the sprayed layer.

2. The ductile and crack-resistant cookware according to claim 1, characterized in that: The ductile element is selected from at least one of Ti, Al and Fe; Wherein, when the ductile element is Ti, Ti exists in the sprayed layer in the form of a single substance.

3. The ductile and crack-resistant cookware according to claim 2, characterized in that: The sprayed layer contains titanium dioxide and ductile components; Wherein, the ductile component is selected from at least one of titanium, aluminum, stainless steel and iron.

4. The ductile and crack-resistant cookware according to claim 1, characterized in that: The cookware further comprises a protective layer, wherein the protective layer is connected to the surface of the sprayed layer; Among them, the protective layer raw material includes a wear-resistant component, a corrosion-resistant component, and an adjusting component. The hardness of the wear-resistant component is greater than the hardness of the sprayed layer; the corrosion resistance of the corrosion-resistant component is better than that of the wear-resistant component and the adjusting component; the ductility of the adjusting component is better than that of the wear-resistant component and the corrosion-resistant component.

5. The ductile and crack-resistant cookware according to claim 4, characterized in that: The wear-resistant component includes at least one of silicon dioxide, aluminum oxide and zirconium oxide; The corrosion-resistant component is selected from at least one of titanium and titanium dioxide; The regulating component is selected from at least one of iron and iron oxide.

6. The method for preparing a cookware with good ductility and crack resistance according to any one of claims 1 to 5, characterized in that: The steps include: (1) Sandblasting the base of the cookware; (2) spraying the spraying raw material onto the inner surface of the pot substrate after sandblasting to form a spraying layer; (3) polishing the sprayed layer to obtain the cookware; The spraying raw material includes 80-95 parts of wear-resistant powder and 5-20 parts of ductile powder.

7. The preparation method according to claim 6, characterized in that: The roughness of the inner surface of the cookware substrate after sandblasting is 2-8 μm; and / or In step (2), the current of the spraying is 240-680A and the voltage is 22-68V.

8. The preparation method according to claim 6, characterized in that: Step (3) further includes the step of forming a protective layer on the surface of the sprayed layer after polishing; The protective layer includes a wear-resistant component, a corrosion-resistant component, and an adjusting component. The hardness of the wear-resistant component is greater than the hardness of the sprayed layer; the corrosion resistance of the corrosion-resistant component is better than that of the wear-resistant component and the adjusting component; and the ductility of the adjusting component is better than that of the wear-resistant component and the corrosion-resistant component.

9. The preparation method according to claim 8, characterized in that: The forming process of the protective layer is as follows: The cookware with the sprayed layer is preheated to 300-350°C for sandblasting and cooling, and then the cookware is preheated to 30°C-55°C, and the components of the protective layer are mixed in a solvent and sprayed on the surface of the sprayed layer preheated to 30°C-55°C, and then sintered and cured at 350°C-500°C to form the protective layer.

10. The preparation method according to claim 9, characterized in that: When the components of the protective layer are mixed in a solvent, the wear-resistant component is 35-60 parts, the corrosion-resistant component is 5-15 parts, the regulating component is 3-12 parts, and the solvent is 5-10 parts by weight.

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