Non-stick titanium pot without coating
By forming a uniform concave and convex structure and porous oxide layer on the inner surface of the titanium pan, the problems of titanium waste and food stuck in the existing titanium pan when improving non-stick properties are solved, and a higher non-stick effect and pot body strength are achieved.
Patent Information
- Application Number
- CN202421839506.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-07-31
AI Technical Summary
When the existing titanium pots improve non-stick properties, the use of strong acid etching methods leads to waste of titanium and reduced strength of the pot body, and the concave and convex structure easily leads to food stuck and affects the non-stick effect.
Using a multi-layer composite structure design of uncoated non-stick titanium pan, the titanium metal layer forms a uniform concave and convex structure, and an oxide layer is formed on its surface, forming a porous structure through micro-arc oxidation to improve the non-stick effect.
It reduces the amount of titanium metal, improves the strength and corrosion resistance of the pot body, enhances the non-stick effect, and avoids the problem of food stuck.
Smart Images
Figure CN223008873U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cooking utensils, and particularly relates to a non-stick titanium pan without a coating. Background Art
[0002] With the development of society, the application of physical non-stick pans is becoming more and more extensive. Among them, titanium metal is widely used in the manufacture of kitchen utensils due to its light weight, high strength, excellent corrosion resistance and other characteristics. In order to improve the non-stick performance of existing titanium pans, generally, an uneven structure is processed on the inner surface of the pan body by etching. Since the metal properties of titanium in titanium alloy cookware are relatively stable, ordinary etching solutions cannot be used, and strong acid solutions must be used for treatment. Such a production method not only has high costs, but also poses safety and health risks for workers working in such an environment for a long time. In addition, in the production methods of most current etched titanium pans, relatively thick materials such as titanium metal materials of at least more than 0.4 mm are required. After etching, the thickness of the recessed part is about 0.2 mm. It can be seen that using the method of strong acid etching to process the uneven structure will remove materials in the pan body, which will not only cause waste of titanium, but also the thickness of the recessed part is relatively thin, and it is easy to break during the subsequent stretching and forming of the pan body.
[0003] In addition, when the uneven structure in the current non-stick pan is used, due to the different sizes of foods, usually small foods will still enter the concave part, which will not only cause the problem of blocking the blind holes, but also may cause the food to get stuck in the cells, thereby affecting the non-stick effect of the cookware.
[0004] Therefore, it is very necessary to design a titanium metal cookware that is easy to manufacture and can ensure good physical non-stick effect. Summary of the Utility Model
[0005] The utility model aims to solve one of the technical problems in the related technologies to a certain extent. For this purpose, the utility model provides a non-stick titanium pan without a coating, which is easy to manufacture, reduces the consumption of titanium metal, and improves the non-stick effect.
[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:
[0007] A non-stick titanium pan without a coating, the multi-layer composite structure includes a titanium metal layer, the titanium metal layer forms the inner surface of the pan body, and the titanium metal layer on the inner surface of the pan body is formed with an uneven structure with uniform thickness. The uneven structure includes a number of interconnected uneven cells. Each uneven cell includes a first protruding portion protruding from the inner surface of the pan body and a recessed portion formed by surrounding the first protruding portion. The recessed portion further includes a second protruding portion disposed in the recessed portion, and the top end of the second protruding portion is lower than the top end of the first protruding portion. The surface of the titanium metal layer at the uneven structure forms an oxide layer with a non-stick effect.
[0008] In this technical solution, the titanium metal layer is set on the inner surface of the pot body, which can reduce the weight of the pot body from the material of the pot body, improve the strength and corrosion resistance of the pot body; and an uneven structure is set on the titanium metal layer to improve the non-stick effect of the inner surface of the pot body. In addition, the thickness of the uneven structure on the titanium metal layer is uniform, which is different from the problems of titanium waste and reduced pot body strength caused by removing materials from the pot body by the etching process in the prior art.
[0009] Through the setting of the first convex part, the concave part and the second convex part in the concave part of the uneven structure, when in use, the second convex part can prevent solid food from contacting the non-stick layer in the cell formed by the pattern. At the same time, the structure that the second convex part is lower than the first convex part can form a concave arc between the two. Since the non-stick property of the non-stick pan is based on the principle of aerodynamics, and most foods are irregular in shape, the arc-shaped cells can be better sealed by the food. When the non-stick layer generates hot air, it can better lift the food, and it can avoid food blocking the concave part and thus improve the non-stick effect.
[0010] Furthermore, the oxide layer includes a first oxide layer formed on the bottom surface and side surface of the concave part, the top surface and side surface of the second convex part, and a second oxide layer formed on the top surface of the first convex part. The thickness of the first oxide layer is 20-40um, and the thickness of the second oxide layer is 8-20um. The surface of the first convex part is polished after oxidation, which can improve the quality of the inner surface of the pot body and increase wear resistance. The first convex part being higher than the concave part can prevent the oxide layer in the concave part from being polished and ensure a high non-stick effect in the concave part.
[0011] Furthermore, the width of the first convex part is 0.2-0.5mm, the height of the first convex part is 0.08-0.25mm, and the radial dimension of the concave part is 2.5-3.5mm.
[0012] Furthermore, the oxide layer is formed by micro-arc oxidation of the titanium metal layer, and a porous structure is formed inside the oxide layer and at least some of the pores are interconnected. The oxide layer processed by micro-arc oxidation is thicker, and has intricate pores inside. The pores can also communicate with each other to store more oil molecules. When heated, the air in the pores generates thermal expansion, making the pot body have a better non-stick effect.
[0013] Furthermore, the proportion of the first convex part in the area of the whole uneven structure is not more than 20%, and the proportion of the concave part in the whole uneven area is not less than 80%. Controlling the proportion of the first convex part and the concave part can ensure the area of the concave part, ensure the area of the non-stick area, and improve the non-stick effect.
[0014] Furthermore, the second convex part is set at the center position of the concave part, the radial dimension of the second convex part is 0.15-0.2mm, and the height of the second convex part is 0.05-0.1mm lower than the height of the first convex part.
[0015] Further, the multi-layer composite structure of the pot body adopts a titanium-aluminum composite structure; or, the multi-layer composite structure of the pot body adopts a titanium-aluminum-steel composite structure and the aluminum metal layer is located between the titanium metal layer and the steel metal layer.
[0016] Further, the aluminum metal layer and the titanium metal layer are hot-pressed and compounded so that the concave-convex structures of the aluminum metal layer and the titanium metal layer form an interlocking structure. In this way, better bonding force can be achieved between the two metals, improving the overall effect of the pot body and reducing the consumption of titanium metal.
[0017] Further, the shape structure of the recessed part formed by enclosing the first convex part is circular or regular polygon.
[0018] Further, the top ends of the first convex part and / or the second convex part are configured as tips. Further reduce the contact area between the food and the pot body and improve the non-stick effect.
[0019] These features and advantages of the present utility model will be disclosed in detail in the following specific embodiments and the accompanying drawings. The best embodiments or means of the present utility model will be shown in detail in combination with the accompanying drawings, but it is not a limitation to the technical solution of the present utility model. In addition, these features, elements and components that appear in each of the following texts and drawings are multiple, and different symbols or numbers are marked for convenience of representation, but they all represent components with the same or similar structures or functions. Description of the Drawings
[0020] The following further describes the present utility model in conjunction with the accompanying drawings:
[0021] Figure 1 It is a schematic diagram of the overall structure of the pot body of the present utility model;
[0022] Figure 2 It is a partial schematic diagram of the present utility model adopting a titanium-aluminum composite structure;
[0023] Figure 3 It is a schematic diagram of the dimension markings of each part at the concave-convex structure of the present utility model;
[0024] Figure 4 It is a partial schematic diagram of the titanium-aluminum-steel composite structure of the present utility model;
[0025] Figure 5 It is a schematic diagram of the distribution of the oxide layer at the concave-convex structure of the present utility model;
[0026] Figure 6 It is a schematic diagram of the concave-convex structure at one embodiment of the present utility model;
[0027] Figure 7 It is a schematic diagram of the internal structure of the oxide layer at one embodiment of the present utility model.
[0028] Among them,
[0029] 1. Cooker body; 11. Titanium metal layer; 12. Aluminum metal layer; 13. Steel metal layer; 14. First protrusion; 15. Depression; 16. Second protrusion; 17. Oxide layer; 171. First oxide layer; 172. Second oxide layer; 173. Pores; 18. Handle; 19. Flange. Specific embodiments
[0030] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. Based on the embodiments in the implementation manners, it is intended to explain the present utility model and should not be construed as a limitation to the present utility model.
[0031] As used herein, the phrase "one embodiment" or "example" or "instance" means that a particular feature, structure, or characteristic described in connection with the embodiment itself may be included in at least one embodiment of the present patent disclosure. The appearances of the phrase "in one embodiment" in various positions in the specification do not necessarily refer to the same embodiment.
[0032] Refer to the attached Figure 1 , Figure 2 and Figure 4 , one embodiment of the present utility model includes a non-stick titanium pot without a coating, including a cooker body 1. The base material of the cooker body 1 is a multi-layer composite structure. The multi-layer composite structure includes a titanium metal layer 11. The titanium metal layer 11 forms the inner surface of the cooker body 1. In this embodiment, the titanium metal layer 11 is disposed on the inner surface of the cooker body 1, and a concavo-convex structure with a uniform thickness is formed on the titanium metal layer 11. It should be noted that the uniform thickness here means that the thickness of the titanium metal layer 11 within the entire concavo-convex structure range is consistent, and there is no problem that the metal layer thickness of the depression 15 generated by etching the inner surface of the cooker body 1 in the prior art is thinner than that of the protrusion. This can ensure the strength of the entire cooker body 1 and is also convenient for stretch forming during the production of the cooker body 1, improving the yield rate.
[0033] Refer to the attached Figure 2 , Figure 4 , the concavo-convex structure in this embodiment includes a number of interconnected concavo-convex cells. Each concavo-convex cell includes a first protrusion 14 protruding from the inner surface of the cooker body 1 and a depression 15 formed by enclosing the first protrusion 14. The depression 15 further includes a second protrusion 16 disposed within the depression 15. The top end of the second protrusion 16 is lower than the top end of the first protrusion 14. The surface of the titanium metal layer 11 at the concavo-convex structure forms an oxide layer 17 with a non-stick effect. During cooking, the oxide layer 17 is in direct contact with the food.
[0034] In actual use, the concave-convex structure in the pot body 1 achieves a non-stick effect, and its non-stick effect is mainly reflected in the following aspects:
[0035] 1) The non-stick effect is achieved through the structure of the concave-convex structure itself. The concave-convex structure can reduce the contact area between the inner surface of the pot body 1 and the food, thereby avoiding the food sticking to the inner surface of the pot body 1;
[0036] 2) Due to the setting of the structure of the recess 15, during cooking, mixtures such as oil and water will preferentially enter the recess 15. When the pot body 1 is heated, the high temperature generated by the oil and water will lift the food from the bottom of the food, thereby avoiding the food sticking to the inner surface of the pot body 1;
[0037] 3) The setting of the second protrusion 16 can prevent smaller-sized food from entering the recess 15 and blocking the recess 15. The height of the second protrusion 16 is lower than the height of the first protrusion 14. In this way, during the cooking process, it is equivalent to forming a two-layer support structure for the food, avoiding tiny food from adhering to the bottom of the recess 15 and improving the non-stick effect. In addition, a concave arc structure will be formed between the second protrusion 16 and the first protrusion 14. Since the non-stick property of the non-stick pan in this application is based on the principle of aerodynamics, and the food is mostly irregular in shape, the arc-shaped cell structure can be better sealed by the food. In this way, the non-stick layer is more likely to generate hot air, thereby better lifting the food;
[0038] 4) Due to the setting of the oxide layer 17, the oxide layer 17 is formed on the surfaces of the first protrusion 14, the recess 15, and the second protrusion 16. The oxide layer 17 in this embodiment is formed by micro-arc oxidation. The interior of the oxide layer 17 is a porous 173 structure, and the pores 173 are interconnected with each other. In this way, during actual cooking, the pores 173 will absorb oil and water molecules, and the interconnected structure will also improve the storage capacity for oil and water molecules. When cooking and heating, the oil and water molecules will evaporate into gas, thereby increasing the evaporation amount of the gas, better lifting the food, and achieving a better non-stick effect.
[0039] It can be seen that in this embodiment, the inner surface of the pot body 1 is set as a titanium metal layer 11, which can reduce the weight of the pot body 1, improve the strength and corrosion resistance of the pot body 1; and an uneven structure is provided on the titanium metal layer 11 to improve the non-stick effect of the inner surface of the pot body 1 (through the various structures for improving the non-stick effect mentioned above). In addition, the thickness of the uneven structure on the titanium metal layer 11 is uniform, which is different from the problems of titanium waste and reduced strength of the pot body 1 caused by removing materials from the pot body 1 by the etching process in the prior art. In actual setting, the thickness of the titanium metal layer 11 in the present utility model only needs to be 0.25 - 0.35 mm. Compared with the titanium non-stick pot processed by the traditional etching method (the thickness of the titanium metal layer 11 is at least 0.4 mm), it is equivalent to saving at least 12.5% - 37.5% of the titanium usage.
[0040] It should be noted that the uneven structure in the present utility model can cover the entire inner surface of the pot body 1, and of course, the uneven structure can also be provided only on a part of the inner surface.
[0041] See the attached Figure 5 Referring to the attached figure, the oxide layer 17 of one embodiment of the present utility model includes a first oxide layer 171 formed on the bottom surface and side surfaces of the recessed portion 15, the top surface and side surfaces of the second protruding portion 16, and a second oxide layer 172 formed on the top surface of the first protruding portion 14. The thickness of the first oxide layer 171 is 20 - 40 μm, and the thickness of the second oxide layer 172 is 8 - 20 μm. Since after the inner surface of the pot body 1 is oxidized, generally, the inner wall of the pot body 1 needs to be polished to remove the impurities formed on the inner surface of the pot body 1 during the oxidation process to improve the surface quality of the pot body 1. During the polishing process, the thickness of the oxide layer 17 on the top surface of the first protruding portion 14 will be thinned to a certain extent. However, due to the relatively thick thickness of the oxide layer 17 formed by micro-arc oxidation, in actual production, there will still be a certain thickness of the first oxide layer 171 (8 - 20 μm) remaining on the top surface of the first protruding portion 14 after polishing. In addition, during the polishing process, due to the existence of the first protruding portion 14, the surfaces inside the recessed portion 15 and the second protruding portion 16 will not be polished. At this time, the thickness of the second oxide layer 172 on the surfaces of the recessed portion 15 and the second protruding portion 16 is relatively thick, and the non-stick effect that can be produced is better. Moreover, the recessed portion 15 is also the main area for achieving the non-stick effect, so that the pot body 1 can achieve a better non-stick effect.
[0042] See the attached Figure 3, in one embodiment of the present utility model, the width of the first protrusion 14 is set to L2 = 0.2 - 0.5 mm, and the height of the first protrusion 14 is set to H1 = 0.08 - 0.25 mm. The distance between two points on the first protrusion 14 that are opposite to each other with respect to the center of the recess 15 is H2 = 2.5 - 3.5 mm. In actual setting, the shape of the recess 15 formed by enclosing the first protrusion 14 is circular or regular polygon (generally regular hexagon). When the shape of the recess 15 is circular, the diameter is set to 2.5 - 3.5 mm. When the recess 15 is a regular hexagon, the distance between two opposite sides is set to 2.5 - 3.5 mm.
[0043] The oxide layer 17 in the present utility model is a titanium dioxide layer formed by micro-arc oxidation of the titanium metal layer 11. A porous structure 173 is formed inside the oxide layer 17 and at least some of the pores 173 communicate with each other. Compared with the oxide film formed by titanium anodic oxidation, the thickness of the titanium dioxide (TiO2) oxide layer 17 formed by micro-arc oxidation of the titanium metal layer 11 is thicker. Moreover, the oxide layer 17 formed by micro-arc oxidation has a higher porosity and roughness, and the film layer has good insulation. In addition, the voltage and current used in the process of micro-arc oxidation are relatively high, generally requiring a voltage of more than 500 V. In production, it is processed by solution circulation, so there is no emission and no pollution. The hardness of the titanium oxide layer prepared in this way can reach HV500 - 600, and it has better wear resistance and corrosion resistance.
[0044] Generally, the oxide film layer produced by titanium anodic oxidation is relatively dense and has a relatively thin thickness, only 0.5 - 2 μm. The voltage and current density are low during the production of anodic oxidation, generally 15 V - 100 V. Therefore, the oxide film made has almost no hardness and is not wear-resistant. Generally, it is made into an oxidized color for the sake of the appearance of the pot body 1, and there is pollution during the process and emissions are required; although theoretically, the ordinary titanium anodic oxidation film can reach 10 - 20 μm, to reach a thickness of 10 - 20 μm, a long oxidation process is required, and the efficiency is low. The film layer of this kind of anodic oxidation film is dense. Spending a large amount of time and cost to increase the thickness of the oxide film cannot improve the non-stick function. Therefore, in the prior art, generally, the surface of the cookware must be processed into a rough surface and then anodic oxidation is carried out on the rough surface to achieve a certain degree of non-stickiness. In addition, since the made anodic oxidation film is relatively thin, when the surface of the first protrusion 14 is polished after oxidation. The anodic oxidation film on the surface of the first protrusion 14 will be directly removed and the metal substrate will be exposed. Then, during cooking, the food will directly contact the metal substrate, which will cause the problem of easy sticking of the pot. If not polished, it will affect the surface quality of the pot body 1.
[0045] The oxide film of micro-arc oxidation has a higher porosity and roughness, and it is not necessary to roughen the surface of the substrate first. See the appendix Figure 7, the titanium dioxide oxide layer 17 formed by micro-arc oxidation is relatively thick, and has intricate pores 173 inside. The pores 173 can also communicate with each other, so that the oxide layer 17 can store more oil molecules. When cooking and heating, the air in the pores 173 generates thermal expansion, which will cause the stored oil molecules to evaporate into oil gas, which can well support the food, so it has better non-stick performance. At the same time, due to the relatively thick oxide layer 17 treated by micro-arc oxidation, when the top surface of the first convex part 14 is polished for aesthetics, a film layer with a thickness of 8-20 μm can still remain on the surface of the first convex part 14 (not less than the thickness of the oxide layer 17 generated by anodic oxidation). Therefore, combined with the structure of the thicker oxide layer 17 (20-40 μm) on the surface of the concave part 15 and the second convex part 16, a better non-stick effect can be achieved.
[0046] In the non-stick titanium pan of the present utility model, the area that mainly plays the non-stick effect is the concave part 15. Therefore, in order to ensure a better non-stick effect, the areas of the concave part 15 and the first convex part 14 of the non-stick pan need to reach a corresponding ratio. In one embodiment of the present utility model, the proportion of the first convex part 14 in the total area of the concave-convex structure is not more than 20%, and the proportion of the concave part 15 in the total concave-convex area is not less than 80%. By controlling the proportion of the first convex part 14 and the concave part 15, the area of the concave part 15 is ensured, that is, the area of the area that mainly plays the non-stick effect is ensured, and the non-stick effect is improved. In actual design, the proportion of the first convex part 14 in the entire concave-convex structure can be comprehensively controlled by controlling the width and distribution density of the first convex part 14.
[0047] See Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6, in one embodiment of the present utility model, the second convex portion 16 is arranged at the central position of the concave portion 15. The diameter of the second convex portion 16 is 0.15 - 0.2 mm, and the height of the second convex portion 16 is lower than the height of the first convex portion 14 by ΔH = 0.05 - 0.1 mm. By setting the height of the second convex portion 16 lower than that of the first convex portion 14, when polishing the inner surface of the pot body 1, the surface of the second convex portion 16 will not be polished. In this way, the oxide layers 17 on the surfaces of both the second convex portion 16 and the concave portion 15 can be retained with a complete thickness, and only a part of the oxide layer 17 on the top surface of the first convex portion 14 will be polished off to improve the surface quality of the pot body 1. In addition, it should be noted that due to the setting of the second convex portion 16, a concave arc structure will be formed between the second convex portion 16 and the first convex portion 14, and this structure is more conducive to holding up food and improving the non-stick effect. Of course, setting the second convex portion 16 at the middle position of the concave portion 15 is a preferred embodiment of this application, and its distance from the periphery of the first convex portion 14 is equal, making the overall appearance of the pot body 1 more beautiful and textured. In actual setting, the second convex portion 16 can also be arranged at a position deviating from the center of the concave portion 15, and the number of the second convex portions 16 can also be set to multiple. It should be noted that when the number of the second convex portions 16 is set to multiple, the area of the concave portion 15 can be appropriately enlarged at this time, which is equivalent to reducing the area ratio of the first convex portion 14, and a good non-stick effect can also be achieved.
[0048] The multi-layer composite structure of the pot body 1 of the present utility model can adopt a double-layer metal structure of titanium-aluminum composite. At this time, the titanium layer forms the inner surface of the pot body 1, and the aluminum layer forms the outer surface of the pot body 1; alternatively, the multi-layer composite structure of the pot body 1 can also adopt a three-layer metal structure of titanium-aluminum-steel composite. At this time, the aluminum metal layer 12 is located between the titanium metal layer 11 and the steel metal layer 13, and the metal layers of the pot body 1 from the outside to the inside are steel, aluminum, and titanium in sequence.
[0049] When the pot body 1 of the present utility model is manufactured, the multi-layer metal plates of the composite pot are formed by hot pressing and compounding. Moreover, during the hot pressing and compounding process, large metal plates can be made into multiple composite metal plates that match the size of the pot body 1 through continuous rolling, and the concave and convex structures are directly pressed during the compounding process. Therefore, although the inner surface of the pot body 1 has the first convex portion 14 and the concave portion 15, the thickness of the titanium metal layer 11 on its inner surface is uniform and equal in thickness (the thickness of each part of the concave and convex structure is the same). In addition, since aluminum is softer than titanium, during rolling, the titanium metal layer 11 undergoes plastic deformation under the action of pressure, and the aluminum metal layer 12 also undergoes corresponding deformation. The aluminum metal enters the space formed during the pressing of the concave and convex structures, forming a structure in which the aluminum metal layer 12 and the titanium metal layer 11 are nested with each other. See the appendix Figure 5 、 6, so that a better bonding force can be achieved between the two metals, improving the overall effect of the pot body 1 and reducing the titanium metal material consumption. The formed metal plate can adopt a relatively thin titanium metal layer 11, that is, the formed cookware has a pattern with a concave-convex structure on the inner surface, an inlaid structure in the middle, and the reverse side can be freely selected to have a pattern or a flat surface.
[0050] See the appendix Figure 5 , in the concave-convex structure of the present utility model, the top surfaces of the first convex portion 14 and the second convex portion 16 can be set as a planar structure. The top ends of the first convex portion 14 and / or the second convex portion 16 in one embodiment of the present utility model are configured as tips. See the appendix Figure 6 , the top ends of the first convex portion 14 and the second convex portion 16 are simultaneously set as tip structures. In this way, during cooking, the contact area between the food and the pot body 1 is smaller (compared with the structure where the top ends of the first convex portion 14 and the second convex portion 16 are planar), and a better non-stick effect can be achieved. In addition, it can be imagined that in actual design, the top ends of the first convex portion 14 and the second convex portion 16 can be simultaneously set as planar or tips, or one can be set as planar and the other as tip. It should be noted that when the top ends of the first convex portion 14 and the second convex portion 16 are configured as tips, the widths of the first convex portion 14 and the second convex portion 16 refer to the widths at their roots.
[0051] Of course, the pot body 1 of the present utility model is also provided with a handle 18, wherein the handle 18 is made of a material with poor thermal conductivity such as wood or rubber, and the handle 18 is detachably connected to the pot body 1. A flanging 19 can also be provided at the opening edge of the pot body 1. The flanging 19 improves the overall appearance of the cookware, enhances the strength of the pot body 1, and improves the safety during use (avoiding scalding, scratching, etc.).
[0052] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that the present utility model includes but is not limited to the content described in the drawings and the above specific implementation manner. Any modification that does not deviate from the functional and structural principles of the present utility model will be included in the scope of the claims.
Claims
1. A non-stick titanium pan without coating, comprising a pan body (1), characterized in that: The base material of the pot body (1) is a multi-layer composite structure, the multi-layer composite structure comprising a titanium metal layer (11), the titanium metal layer (11) forming the inner surface of the pot body (1), the titanium metal layer (11) on the inner surface of the pot body (1) forming a concave-convex structure with uniform thickness, the concave-convex structure comprising a plurality of mutually connected concave-convex cells, each of the concave-convex cells comprising a first protruding portion (14) protruding from the inner surface of the pot body (1) and a concave portion (15) formed by the first protruding portion (14), the concave portion (15) comprising a second protruding portion (16) arranged in the concave portion (15), the top of the second protruding portion (16) being lower than the top of the first protruding portion (14), and the titanium metal layer (11) forming an oxide layer (17) having a non-stick effect on the surface of the concave-convex structure.
2. The non-stick titanium pan without coating as claimed in claim 1, characterized in that: The oxide layer (17) comprises a first oxide layer (171) formed on the bottom and side surfaces of the recessed portion (15), the top and side surfaces of the second raised portion (16), and a second oxide layer (172) formed on the top surface of the first raised portion (14); the thickness of the first oxide layer (171) is 20 to 40 um, and the thickness of the second oxide layer (172) is 8 to 20 um.
3. The non-stick titanium pan without coating as claimed in claim 1, characterized in that: The width of the first protruding portion (14) is 0.2-0.5 mm, the height of the first protruding portion (14) is 0.08-0.25 mm, and the radial dimension of the recessed portion (15) is 2.5-3.5 mm.
4. The non-stick titanium pan without coating as claimed in claim 1, characterized in that: The oxide layer (17) is formed by micro-arc oxidation of the titanium metal layer (11), and a multi-pore (173) structure is formed inside the oxide layer (17), and at least some of the pores (173) are interconnected.
5. The uncoated non-stick titanium pan according to any one of claims 1 to 4, characterized in that: The first raised portion (14) accounts for no more than 20% of the entire concave-convex structure area, and the recessed portion (15) accounts for no less than 80% of the entire concave-convex structure area.
6. The uncoated non-stick titanium pan according to any one of claims 1 to 4, characterized in that: The second raised portion (16) is arranged at the center of the recessed portion (15), the diameter of the second raised portion (16) is 0.15-0.2 mm, and the top of the second raised portion (16) is 0.05-0.1 mm lower than the top of the first raised portion (14).
7. The uncoated non-stick titanium pan according to any one of claims 1 to 4, characterized in that: The multi-layer composite structure of the pot body (1) adopts a titanium-aluminum composite structure; or, the multi-layer composite structure of the pot body (1) adopts a titanium-aluminum-steel composite structure, and the aluminum metal layer (12) is located between the titanium metal layer (11) and the steel metal layer (13).
8. The non-stick titanium pan without coating as claimed in claim 7, characterized in that: The aluminum metal layer (12) and the titanium metal layer (11) are hot-pressed and composited so that the concave-convex structures of the aluminum metal layer (12) and the titanium metal layer (11) form a mutually nested structure.
9. The uncoated non-stick titanium pan according to any one of claims 1 to 4, characterized in that: The shape of the recessed portion (15) formed by the first raised portion (14) is circular or regular polygonal.
10. The uncoated non-stick titanium pan according to any one of claims 1 to 4, characterized in that: The top end of the first protrusion (14) and / or the second protrusion (16) is configured as a pointed end.