Composite titanium metal cookware and the manufacture method of the same

Abstract

This invention discloses a composite titanium cookware, comprising: a multi-layer cookware body, the multi-layer cookware body including a titanium layer on the inner side of the multi-layer cookware body, a stainless steel layer on the outer side of the multi-layer cookware body, and an aluminum alloy sandwich structure between the titanium layer and the stainless steel layer; the aluminum alloy sandwich structure includes at least two aluminum alloy material layers bonded together by a first atomic diffusion bonding method, wherein the at least two aluminum alloy material layers have different tensile strengths; wherein the titanium layer and the stainless steel layer are bonded to the two sides of the aluminum alloy sandwich structure by a second atomic diffusion bonding method. This invention also discloses a method for manufacturing the composite titanium cookware.

Description

Technical Field

[0001] This invention relates to a divisional application of Taiwan Patent Application No. 113140233, the full contents of which are incorporated herein by reference as part of the patent specification. The invention relates to a titanium cookware and a method for manufacturing the same, and more particularly to a composite titanium cookware and a method for manufacturing the same. Prior Technology

[0002] Modern people pursue health, so the cookware used for cooking and the tableware used to hold food must be non-toxic and pollution-free. Titanium, due to its lightweight, high-temperature resistance, corrosion resistance, and low thermal conductivity, is increasingly being used to make cookware.

[0003] Titanium's physical properties include light weight and high strength, giving titanium cookware the advantage of being lightweight. However, although titanium's thermal conductivity is similar to that of steel, its low specific heat capacity results in rapid heat dissipation. Furthermore, titanium cookware is often made from thin sheets of titanium, which limits its heat retention. This causes the parts of the cookware in contact with the heat source to heat up very quickly, while the parts not in contact with the heat source cool down rapidly. This concentrates heat in the areas in contact with the heat source, while the areas not in contact with the heat source remain cool. Consequently, food in the areas with concentrated heat is prone to overheating and burning, while food in the cooler areas of the cookware is prone to undercooking or even remaining uncooked.

[0004] In existing technologies, some titanium cookware consists of a titanium plate bonded to a heat-conducting metal layer, allowing for even heating through heat conduction. However, in current titanium cookware, the titanium plate and the heat-conducting metal layer are typically joined using hard or soft soldering, which is prone to poor welding. Furthermore, due to the different coefficients of thermal expansion between titanium and the heat-conducting metal, the titanium layer can easily peel off from the heat-conducting metal layer after prolonged use, resulting in a decrease in the cookware's thermal conductivity.

[0005] Due to the above factors, existing titanium cookware is quite inconvenient to use and difficult to manufacture. Therefore, how to overcome these shortcomings through structural design improvements has become one of the important issues that this project aims to address. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a composite titanium cookware and its manufacturing method, which addresses the shortcomings of the prior art.

[0007] To solve the above-mentioned technical problems, one of the technical solutions adopted by the present invention is to provide a composite titanium cookware, which includes: a multi-layer cookware body, the multi-layer cookware body comprising a titanium metal layer located on the inner side of the multi-layer cookware body, a stainless steel layer located on the outer side of the multi-layer cookware body, and an aluminum alloy sandwich structure located between the titanium metal layer and the stainless steel layer; the aluminum alloy sandwich structure comprises at least two aluminum alloy material layers bonded together by atomic diffusion bonding, wherein the at least two aluminum alloy material layers have different tensile strengths; wherein the titanium metal layer and the stainless steel layer are bonded to the two sides of the aluminum alloy sandwich structure by atomic diffusion bonding after the at least two aluminum alloy material layers of the aluminum alloy sandwich structure have been atomically bonded; wherein the multi-layer cookware body is formed by plastic forming of the multi-layer composite substrate after the aluminum alloy sandwich structure, the titanium metal layer and the stainless steel layer are bonded together to form a planar multi-layer composite substrate.

[0008] In a preferred embodiment of the present invention, the aluminum alloy sandwich structure comprises a first aluminum alloy material layer and two second aluminum alloy material layers attached to opposite sides of the first aluminum alloy material layer; the tensile strength of the first aluminum alloy material layer is higher than the tensile strength of the two second aluminum alloy material layers; the first aluminum alloy material layer and the two second aluminum alloy material layers are bonded together by atomic diffusion bonding.

[0009] This invention also provides a method for manufacturing a composite titanium cookware, comprising: a metal sheet preparation step, wherein the metal sheet preparation step involves cutting multiple aluminum alloy sheets used to manufacture the aluminum alloy sandwich structure into at least two aluminum alloy material layers, cutting titanium metal sheets used to manufacture the titanium metal layer into the titanium metal layer, and cutting stainless steel sheets used to manufacture the stainless steel layer into the stainless steel layer; wherein the at least two aluminum alloy material layers have different tensile strengths; and a first diffusion bonding step, wherein after stacking the at least two aluminum alloy material layers, bonding them by atomic diffusion. The titanium metal layer and the stainless steel layer are combined together to form the aluminum alloy sandwich structure; the second diffusion bonding step is to place the titanium metal layer and the stainless steel layer on both sides of the aluminum alloy sandwich structure, and then bond the titanium metal layer and the stainless steel layer to the aluminum alloy sandwich structure through atomic diffusion bonding to form a plate-shaped multilayer composite substrate; the cookware forming step is to form the multilayer composite substrate into the multilayer cookware body; and the trimming step is to cut the edge material of the multilayer cookware body formed in the cookware forming step and trim the edges of the cut multilayer cookware body.

[0010] One of the advantages of this invention is that it uses an aluminum alloy sandwich structure between a titanium metal layer and a stainless steel layer, and then uses a diffusion bonding method to bond the titanium metal layer, the stainless steel layer, and the aluminum alloy sandwich structure together. This overcomes the difficulty of bonding titanium and stainless steel in existing cookware manufacturing methods, and allows the various metal layers of the multi-layer cookware body to be bonded through atomic diffusion, so that the metal layers will not peel off and have the same strength as cookware made of one-piece molded metal sheet.

[0011] To further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are for reference and illustration only and are not intended to limit the present invention. Simple Explanation of the Diagram

[0012] Figure 1 is a combined side view schematic diagram of the first embodiment of the present invention.

[0013] Figure 2 is an enlarged cross-sectional view of part II of Figure 1.

[0014] Figure 3 is a schematic diagram of the aluminum alloy sandwich structure of the present invention in the unassembled state of the first aluminum alloy material layer and the second aluminum alloy material layer.

[0015] Figure 4 is a schematic diagram of the operation method of the present invention to perform the first diffusion bonding procedure to bond the first aluminum alloy material layer and the second aluminum alloy material layer into an aluminum alloy sandwich structure.

[0016] Figure 5 is a schematic diagram of the titanium metal layer, stainless steel layer and aluminum alloy sandwich structure of the present invention in the unassembled state.

[0017] Figure 6 is a schematic diagram of the operation method of implementing the second diffusion bonding process of the present invention to combine a titanium metal layer, a stainless steel layer and an aluminum alloy sandwich structure into a multi-layer composite substrate for manufacturing a multi-layer cookware body.

[0018] Figure 7 is a schematic diagram of the operation method for implementing the pot forming step of the present invention.

[0019] Figure 8 is a schematic diagram of the operation method for implementing the trimming step of the present invention.

[0020] Figure 9 is a schematic diagram of another variation of the composite titanium cookware of this invention.

[0021] Figure 10 is a schematic flowchart of the manufacturing method of the composite titanium cookware of the present invention. Implementation

[0022] The following specific embodiments illustrate the implementation of the "composite titanium cookware and its manufacturing method" disclosed in this invention. Those skilled in the art can understand the advantages and effects of this invention from the content disclosed in this specification. This invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this invention.

[0023] Referring to Figures 1 to 10, embodiments of the present invention provide a composite titanium cookware and its manufacturing method. For ease of explanation, this specification will first describe the structure of the composite titanium cookware 1, and then describe the manufacturing method of the composite titanium cookware 1.

[0024] As shown in Figures 1 and 2, the composite titanium cookware 1 of the present invention includes: a multi-layer cookware body 10, wherein the multi-layer cookware body 10 defines an inner surface 101 and an outer surface 102. The multi-layer cookware body 10 forms a recessed space 11 on the side facing the inner surface 101, and a handle 12 is provided on one side of the multi-layer cookware body 10, and a lifting handle 13 is provided on the side of the multi-layer cookware body 10 opposite to the handle 12, to facilitate gripping by the user.

[0025] The multi-layer cookware body 10 includes an aluminum alloy sandwich structure 20, a titanium metal layer 30 located on the inner side 101 of the multi-layer cookware body 10, a stainless steel layer 40 located on the outer side of the multi-layer cookware body 10, and an aluminum alloy sandwich structure 20 located between the titanium metal layer 30 and the stainless steel layer 40. In a preferred embodiment of the present invention, the thickness of the first aluminum alloy material layer 21 and the second aluminum alloy material layer 22 can be between 0.2 mm and 0.6 mm.

[0026] As shown in Figures 2 to 4, the aluminum alloy sandwich structure 20 includes a first aluminum alloy material layer 21 and two second aluminum alloy material layers 22 attached to opposite sides of the first aluminum alloy material layer 21. The first aluminum alloy material layer 21 and the second aluminum alloy material layer 22 are made of different aluminum alloy materials and are bonded together by atomic diffusion. Preferably, in the aluminum alloy sandwich structure 20, the first aluminum alloy material layer 21 is made of an aluminum alloy material with a higher tensile strength than the first aluminum alloy material layer 22. For example, in a feasible embodiment of the present invention, the first aluminum alloy material layer 21 can be made of 3003 aluminum alloy, while the second aluminum alloy layer 22 can be made of 1050 aluminum alloy.

[0027] Because the first aluminum alloy layer 21 has high tensile strength, the aluminum alloy sandwich structure 20 has sufficient strength, preventing irregular deformation during plastic processing. The second aluminum alloy layer 22 has lower tensile strength than the first aluminum alloy layer 21, thus giving it higher ductility, allowing the surfaces of the two second aluminum alloy layers 22 to bond tightly with the titanium metal layer 30 and the stainless steel layer 40.

[0028] As shown in Figures 2 and 5, the titanium metal layer 30 and the stainless steel layer 40 are respectively disposed on the inner and outer sides of the aluminum alloy sandwich structure 20, and the titanium metal layer 30 and the stainless steel layer 40 are bonded to the surfaces of the two second aluminum alloy material layers 22 of the aluminum alloy sandwich structure 20 by atomic diffusion bonding technology. Preferably, the titanium metal layer 30 can be made of pure titanium metal sheet, and the thickness of the titanium metal layer 30 can be between 0.2 mm and 0.6 mm.

[0029] Furthermore, in this embodiment, an anti-adhesion layer 31 is formed on the surface of the titanium metal layer 30. The anti-adhesion layer 31 can be a titanium oxide such as titanium oxide (TiOx), titanium nitride (TiN), or titanium oxynitride (TiNxOy). The thickness of the anti-adhesion layer 31 is greater than 3 micrometers (μm). More specifically, the anti-adhesion layer 31 is formed on the surface of the titanium metal layer 30 by means of thermal oxidation, micro-arc oxidation, plasma oxidation, or electrochemical treatment, which brings the surface of the titanium metal layer 30 into contact with oxygen atoms, nitrogen atoms, or other working gas atoms, causing the titanium atoms to react with the oxygen or nitrogen atoms.

[0030] In a preferred embodiment of the present invention, the titanium metal layer 30 is oxidized in the α-phase state, resulting in a rutile crystalline titanium oxide film formed by the reaction of titanium atoms with oxygen or nitrogen atoms on the surface of the titanium metal layer 30. Because the rutile crystalline titanium oxide film is dense, has high hardness, and is non-toxic, it transforms the original metallic surface of the titanium metal layer 30 into a ceramicized titanium oxide film surface, thus forming a non-adhesive surface. This also increases the surface hardness of the titanium metal layer 30, making it less prone to wear, oxidation, corrosion, and the release of toxicity. Furthermore, because the titanium oxide film can be tightly bonded to the titanium atoms on the surface of the titanium metal layer 30, the anti-adhesion layer 31 is not easily peeled off, allowing for long-term use without damage.

[0031] A stainless steel layer 40 is bonded to the opposite side of the aluminum alloy sandwich structure 20, opposite the titanium metal layer 30. The thickness of the stainless steel layer 40 is between 0.2 mm and 0.8 mm. Preferably, the stainless steel layer 40 can be made of a magnetic stainless steel material, so that the stainless steel layer 40 is magnetically conductive. For example, the stainless steel layer 40 can be made of 400 series stainless steel material (e.g., 430 stainless steel) to make it magnetically conductive, so that the multi-layer cookware body 10 can be used on an induction cooker.

[0032] In particular, atomic diffusion bonding technology involves bringing the surfaces of the metals to be bonded into contact, then applying heat and pressure to cause the atoms on the surfaces of the two metals to diffuse and undergo a phase transition, thus bonding them into a single unit. This diffusion bonding technology does not require heating the metal to a liquid melting temperature or filling with solder, allowing large areas of metal sheets to be bonded surface-to-surface without melting or deformation. Furthermore, the bonded metal sheets are firmly connected and possess good strength. Therefore, the multi-layer cookware body 10 of this invention can be formed by bonding multiple layers of thin metal sheets, and the strength of the multi-layer cookware body 10 can rival that of cookware made from a single piece of metal sheet.

[0033] Furthermore, since the atoms of aluminum, titanium, and stainless steel can easily diffuse into each other and form a eutectic structure, the present invention uses an aluminum alloy sandwich structure 20 as the intermediate sandwich layer of the multi-layer cookware body 10, so that the titanium layer 30 and the stainless steel layer 40 can be bonded together through the aluminum alloy sandwich structure 20 which has an affinity for titanium and stainless steel, thus reducing the difficulty of bonding the titanium layer 30 and the stainless steel layer 40 together.

[0034] The manufacturing method of the present invention is described below. Please refer to Figure 10, and simultaneously refer to Figures 3 to 9. The manufacturing method of the composite titanium metal cookware 1 of the present invention mainly includes: a metal sheet preparation step S1, a first diffusion bonding step S2, a second diffusion bonding step S3, a cookware forming step S4, an edge trimming step S5, and an optional surface treatment step S6.

[0035] In the metal sheet preparation step S1, aluminum alloy sheets, titanium sheets, and stainless steel sheets are cut to predetermined dimensions to form a first aluminum alloy layer 21, a second aluminum alloy layer 22, a titanium layer 30, and a stainless steel layer 40. The first aluminum alloy layer 21, the second aluminum alloy layer 22, the titanium layer 30, and the stainless steel layer 40 undergo surface treatment, polishing or grinding the joint surfaces to achieve a flat surface. Next, a cleaning process is performed on the surfaces of the first aluminum alloy layer 21, the second aluminum alloy layer 22, the titanium layer 30, and the stainless steel layer 40 to remove oxides and impurities.

[0036] The metal sheet preparation step S1 makes the surfaces of the first aluminum alloy layer 21, the second aluminum alloy layer 22, the titanium metal layer 30 and the stainless steel layer 40 smooth and free of oxides and impurities, so that each metal layer can be bonded by diffusion bonding.

[0037] Referring to Figures 3 and 4, the first diffusion bonding step S2 involves stacking two second aluminum alloy material layers 22, which have undergone surface treatment and cleaning, on both sides of the first aluminum alloy material layer 21. Then, in a vacuum environment or an inert gas environment, the stacked two second aluminum alloy material layers 22 and the first aluminum alloy material layer 21 are continuously pressurized and heated, so that the two second aluminum alloy material layers 22 and the first aluminum alloy material layer 21 are combined to form an aluminum alloy sandwich structure 20.

[0038] As shown in Figure 4, in one embodiment of the first diffusion bonding step S2, a first heating and pressing device 50 is used to press the second aluminum alloy material layer 22 and the first aluminum alloy material layer 21 together, and heats them to cause diffusion bonding at the contact surfaces of the second aluminum alloy material layer 22 and the first aluminum alloy material layer 21. In this embodiment, the first heating and pressing device 50 is placed in a sealed chamber, and the sealed chamber is evacuated or injected with an inert gas (e.g., argon) to prevent oxidation of the second aluminum alloy material layer 22 and the first aluminum alloy material layer 21 during the diffusion bonding process.

[0039] The first heating and pressing device 50 has a first pressing member 51 and a second pressing member 52 in the shape of a flat plate. They apply pressure from both sides of the aluminum alloy sandwich structure 20 to the outside of the two second aluminum alloy material layers 22, and simultaneously heat the second aluminum alloy material layers 22 and the first aluminum alloy material layers 21, so that atomic diffusion occurs at the joint surface of the second aluminum alloy material layers 22 and the first aluminum alloy material layers 21, and they are joined together.

[0040] In a preferred embodiment of the present invention, in the first diffusion bonding step S2, a static pressure of 10~50 MPa is applied to the second aluminum alloy material layer 22 and the first aluminum alloy material layer 21 in a vacuum heating furnace, and the temperature is between 200-600°C. The heating and pressurization are continued for 10 to 60 minutes, so that the two second aluminum alloy material layers 22 and the first aluminum alloy layer 21 are bonded together to form the aluminum alloy sandwich structure.

[0041] Referring to Figures 5 and 6, the second diffusion bonding step S3 involves attaching the titanium metal layer 30 and the stainless steel layer 40 to both sides of the aluminum alloy sandwich structure 20, and then heating the titanium metal layer 30, the stainless steel layer 40, and the aluminum alloy sandwich structure 20 in a vacuum environment or an environment filled with inert gas, thereby causing the titanium metal layer 30, the stainless steel layer 40, and the aluminum alloy sandwich structure 20 to diffuse bond together, thus forming a multilayer composite substrate P used to manufacture the multilayer cookware body 10.

[0042] As shown in Figure 6, in one embodiment of the second diffusion bonding step S3, a second heating and pressing device 60 is used to press the titanium metal layer 30, the stainless steel layer 40, and the aluminum alloy sandwich structure 20 together, and to heat the titanium metal layer 30, the stainless steel layer 40, and the aluminum alloy sandwich structure 20 to diffuse bond them together, thus forming the multilayer composite substrate P. In this embodiment, the second heating and pressing device 60 is placed in a sealed chamber, and the sealed chamber is evacuated or injected with an inert gas (e.g., argon) to prevent oxidation during the diffusion bonding process of the second aluminum alloy material layer 22 and the first aluminum alloy material layer 21.

[0043] The second heating and pressing device 60 has a first pressing member 61 and a second pressing member 62 in the shape of a flat plate. They apply pressure from the outside of the titanium metal layer 30 and the stainless steel layer 40, respectively, and simultaneously heat the titanium metal layer 30, the stainless steel layer 40 and the aluminum alloy sandwich structure 20, so that atomic diffusion occurs at the joint surface of the titanium metal layer 30, the stainless steel layer 40 and the aluminum alloy sandwich structure 20, and they are joined together to form a flat multilayer composite substrate P.

[0044] Preferably, in the second diffusion bonding step S3, a static pressure of 10-50 MPa is applied to the titanium metal layer 30, the aluminum alloy sandwich structure 20 and the stainless steel layer 40 in a vacuum heating furnace, and the temperature is between 400-750°C. The heating and pressurization are continued for 10 to 60 minutes, so that the titanium metal layer 30, the aluminum alloy sandwich structure 20 and the stainless steel layer 40 diffuse bond together to form the aluminum alloy sandwich structure.

[0045] As shown in Figures 10 and 7, the cookware forming step S4 involves using the multi-layer composite substrate P to perform plastic processing, so that the multi-layer composite substrate P is formed into a multi-layer cookware body 10.

[0046] Referring to the embodiment shown in Figure 7, the multilayer composite substrate P is formed into a multilayer cookware body 10 using a molding die 70. The molding die 70 has an upper die 71 and a lower die 72, which have complementary mold cores and cavities, respectively, and can be used to form the flat multilayer composite substrate P into a multilayer cookware body 10 with recessed spaces 11.

[0047] It should be noted that although the method shown in Figure 7 discloses the use of a molding die 70 to form the multi-layer cookware body 10, the present invention is not limited thereto. For example, in the cookware forming step S4, methods such as spin forming, pressure forming, and explosive forming can also be used to form the multi-layer cookware body 10. Furthermore, the number of times the cookware forming step S4 is not limited to one. For example, if the shape of the multi-layer cookware body 10 cannot be formed in a single step, multiple cookware forming steps S4 can be used to process the multi-layer composite substrate P in stages to form the multi-layer cookware body 10.

[0048] Referring to Figures 10 and 8, the trimming step S5 involves cutting off the excess edge material P1 from the edge of the formed multi-layer cookware body 10, and then trimming the edge of the multi-layer cookware body 10 to remove burrs. As shown in Figure 8, after the multi-layer composite substrate P is formed into the multi-layer cookware body 10, there will be irregularly shaped edge material P1 on the edge of the multi-layer cookware body 10. Therefore, the excess edge material P1 on the edge of the multi-layer cookware body 10 can be cut off first using the edge trimming device 80. Then, the edge of the multi-layer cookware body 10 after trimming is ground to remove burrs, so that the edge of the multi-layer cookware body 10 is flat or forms an arc corner or chamfer.

[0049] After the multi-layer cookware body 10 is formed and trimmed, a surface treatment step S6 can be selectively performed. The surface treatment step S6 mainly involves oxidizing the surface of the titanium metal layer 30 on the inner side of the multi-layer cookware body 10, thereby forming the anti-stick layer 31 on the surface of the titanium metal layer 30. In a feasible embodiment of the present invention, the surface treatment step S6 can employ thermal oxidation, micro-arc oxidation, or electrochemical oxidation to react the surface of the titanium metal layer 30 with oxygen or nitrogen atoms, forming a titanium oxide, titanium nitride, or titanium oxynitride film, thus forming the anti-stick layer 31.

[0050] Through the above steps, the multi-layer cookware body 10 can be further fitted with other accessories (such as handles 12 and carrying handles 13) to produce the composite titanium cookware 1 of the present invention.

[0051] Furthermore, in the embodiments shown in Figures 1 to 8 of this invention, the disclosed composite titanium cookware 1 is in the form of a wok or a frying pan. However, this invention is not limited to this, and the composite titanium cookware 1 of this invention can also be other different forms of cookware. As shown in the embodiment in Figure 9, the composite titanium cookware 1 is a soup pot; therefore, in this embodiment, the multi-layered cookware body 10 of the composite titanium cookware 1 forms a cylindrical container shape with considerable depth.

[0052] [Beneficial Effects of the Examples]

[0053] One of the advantages of this invention is that it uses an aluminum alloy sandwich structure between a titanium metal layer and a stainless steel layer, and then uses a diffusion bonding method to bond the titanium metal layer, the stainless steel layer, and the aluminum alloy sandwich structure together. This overcomes the difficulty of bonding titanium and stainless steel in existing cookware manufacturing methods, and allows the various metal layers of the multi-layer cookware body to be bonded through atomic diffusion, so that the metal layers will not peel off and have the same strength as cookware made of one-piece molded metal sheet.

[0054] Furthermore, the aluminum alloy sandwich structure of the present invention is formed by diffusion bonding of a first aluminum alloy material layer and two second aluminum alloy material layers located on both sides of the first aluminum alloy material layer. The tensile strength of the first aluminum alloy material layer is higher than that of the second aluminum alloy material layer, thus enabling the aluminum alloy sandwich structure to maintain a certain strength. The second aluminum alloy material layer has better ductility and can easily make close contact with the titanium metal layer and the stainless steel layer.

[0055] The content disclosed above is only a preferred and feasible embodiment of the present invention, and is not intended to limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention specification and drawings are included in the scope of the patent application of the present invention.

[0056] 1: Composite titanium cookware 10: Multi-layer cookware body 101: Inner side 102: Outer side 11: Concave space 12: Grip 13: Handle 20: Aluminum alloy sandwich structure 21: First aluminum alloy material layer 22: Second aluminum alloy material layer 30: Titanium metal layer 31: Anti-adhesion layer 40: Stainless steel layer 50: First heating and pressing device 51: First pressing part 52: Second pressing component 60: Second heating and pressing device 61: First pressed part 62: Second pressing component 70: Molding mold 71: Upper mold 72: Lower mold 80: Edge trimming device P: Multilayer composite substrate P1: Edge material S1: Metal Sheet Preparation Steps S2: First diffusion bonding step S3: Second diffusion bonding step S4: Cookware Forming Steps S5: Trimming Steps S6: Surface treatment steps

Claims

1. A composite titanium cookware, comprising: A multi-layer cookware body includes a titanium metal layer on the inner side of the multi-layer cookware body, a stainless steel layer on the outer side of the multi-layer cookware body, and an aluminum alloy sandwich structure between the titanium metal layer and the stainless steel layer. The aluminum alloy sandwich structure includes a first aluminum alloy material layer and two second aluminum alloy material layers attached to opposite sides of the first aluminum alloy material layer. The first aluminum alloy material layer and the two second aluminum alloy material layers are bonded together by atomic diffusion bonding. The first aluminum alloy material layer and the two second aluminum alloy material layers have different tensile strengths. The titanium metal layer and the stainless steel layer are formed by a first atomic diffusion bonding of the first aluminum alloy material layer and the two second aluminum alloy material layers in the aluminum alloy sandwich structure to form a eutectic structure, and then formed by a second atomic diffusion bonding, and bonded to the two sides of the aluminum alloy sandwich structure. The multi-layer cookware body is formed by combining the aluminum alloy sandwich structure, the titanium metal layer, and the stainless steel layer into a planar multi-layer composite substrate, and then shaping the multi-layer composite substrate into the multi-layer cookware body through plastic processing.

2. The composite titanium cookware as claimed in claim 1, wherein the tensile strength of the first aluminum alloy layer is higher than the tensile strength of the two second aluminum alloy layers.

3. The composite titanium cookware as described in claim 2, wherein, The first aluminum alloy material layer can be selected from 3003 aluminum alloy, and the second aluminum alloy material layer can be selected from 1050 aluminum alloy.

4. The composite titanium cookware as described in claim 1, wherein, The surface of the titanium metal layer has an anti-adhesion layer, which is one of titanium oxide, titanium nitride, or titanium oxynitride thin film formed on the surface of the titanium metal layer through thermal oxidation, electrochemical oxidation, or micro-arc oxidation.

5. The composite titanium cookware as described in claim 1, wherein, The stainless steel layer is made of a material selected from magnetic stainless steel.

6. A method for manufacturing a composite titanium cookware, wherein, The composite titanium cookware includes a multi-layer cookware body, which has a titanium layer on the inner side, a stainless steel layer on the outer side, and an aluminum alloy sandwich structure between the titanium layer and the stainless steel layer. The manufacturing method includes: a metal sheet preparation step: the metal sheet preparation step involves cutting multiple aluminum alloy sheets for manufacturing the aluminum alloy sandwich structure into a first aluminum alloy material layer, and two second aluminum alloy material layers attached to opposite sides of the first aluminum alloy material layer; cutting the titanium sheet for manufacturing the titanium layer into the titanium layer; and cutting the stainless steel sheet for manufacturing the stainless steel layer into the stainless steel layer; wherein the at least two aluminum alloy material layers have different tensile strengths; a first diffusion bonding step: the at least two aluminum alloy material layers are stacked and bonded together by atomic diffusion to form a eutectic structure, thus becoming the aluminum alloy sandwich structure. The second diffusion bonding step involves placing the titanium metal layer and the stainless steel layer on both sides of the aluminum alloy sandwich structure, and then bonding the titanium metal layer, the stainless steel layer, and the aluminum alloy sandwich structure together through atomic diffusion bonding to form a eutectic structure, thus becoming a plate-shaped multilayer composite substrate; the cookware forming step involves forming the multilayer composite substrate into the multilayer cookware body; and the edge trimming step involves cutting the edge material of the multilayer cookware body formed in the cookware forming step and trimming the edges of the cut multilayer cookware body.

7. The method for manufacturing the composite titanium cookware as described in claim 6, wherein, The tensile strength of the first aluminum alloy layer is higher than that of the two second aluminum alloy layers.

8. A method for manufacturing the composite titanium cookware as described in claim 7, wherein, The first diffusion bonding step involves applying a static pressure of 10-50 MPa to the titanium metal layer, the aluminum alloy sandwich structure, and the stainless steel layer in a vacuum or inert gas environment, heating them to between 200°C and 600°C, and continuing the heating and pressurization for 10 to 60 minutes.

9. A method for manufacturing the composite titanium cookware as described in claim 6, wherein, The second diffusion bonding step involves applying a static pressure of 10-50 MPa to the titanium metal layer, aluminum alloy sandwich structure, and stainless steel layer in a vacuum or inert gas environment, heating them to between 400°C and 750°C, and continuing the heating and pressurization for 10 to 60 minutes.

10. A method for manufacturing the composite titanium cookware as described in claim 6, wherein, It also includes a surface treatment step, wherein the surface treatment step involves reacting the surface of the titanium metal layer with oxygen or nitrogen atoms through thermal oxidation, micro-arc oxidation, or electrochemical oxidation to form a titanium oxide, titanium nitride, or titanium oxynitride film, thereby forming an anti-adhesion layer on the surface of the titanium metal.

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