Composite titanium metal cookware

Abstract

The utility model discloses a combined type titanium metal cookware which comprises a multi-layer cookware body, and the multi-layer cookware body comprises a titanium metal layer located on the inner side face of the multi-layer cookware body, a stainless steel layer located on the outer side face of the multi-layer cookware body and an aluminum alloy interlayer structure located between the titanium metal layer and the stainless steel layer. Wherein the titanium metal layer and the stainless steel layer are combined on the two side surfaces of the aluminum alloy sandwich structure by means of atomic diffusion bonding.

Description

TECHNICAL FIELD

[0001] The utility model relates to a titanium metal cooking utensil, in particular to a composite titanium metal cooking utensil. BACKGROUND

[0002] Modern people pursue health, so the cooking utensil or tableware for food is required to be non-toxic and zero pollution. Titanium metal is gradually used to make more cooking utensils because of its light weight, high temperature resistance, corrosion resistance and low heat conduction.

[0003] Titanium metal has the physical properties of light weight and high strength, so the titanium metal cooking utensil has the advantage of light weight. However, although the heat conduction coefficient of titanium metal is close to that of steel, the specific heat capacity of titanium metal is low, so titanium metal has the characteristic of fast heat dissipation. In addition, titanium tableware is usually made of titanium sheet, so titanium metal cannot store heat, which causes the temperature of the part of the titanium metal cooking utensil that contacts the heat source to rise easily, but the part that does not contact the heat source is prone to rapid cooling. Therefore, the heat energy is concentrated in the part of the titanium metal cooking utensil that contacts the heat source, and the heat of the part that does not contact the heat source is insufficient. Therefore, the food material contacting the heat concentrated position of the titanium metal cooking utensil is prone to overheat and burn, and the food material contacting the low temperature position of the titanium metal cooking utensil is prone to insufficient cooking, and even cannot be cooked.

[0004] In the prior art, a part of the titanium metal cooking utensil is combined with a heat conducting metal layer using a titanium metal pot, and the heat conduction of the heat conducting metal layer makes the heating of the titanium metal cooking utensil even. However, the titanium metal plate and the heat conducting metal layer of the existing titanium metal cooking utensil are usually connected by hard soldering or soft soldering, so there are defects such as poor soldering. Moreover, because the expansion coefficients of titanium metal and heat conducting metal are different, after long time use, the titanium metal layer is prone to peel off from the heat conducting metal layer, which causes the heat conduction performance of the cooking utensil to decrease.

[0005] Due to the above factors, the existing titanium metal cooking utensil is quite inconvenient to use and difficult to manufacture. Therefore, how to overcome the above defects through structural design improvement has become one of the important topics that the industry wants to solve. UTILITY MODEL CONTENT

[0006] The technical problem to be solved by the present application is to provide a composite titanium metal cooking utensil to overcome the deficiencies of the prior art.

[0007] To solve the above technical problems, one of the technical solutions adopted by the present application is to provide a composite titanium metal pot, which comprises a multi-layer pot body, the multi-layer pot body comprises a titanium metal layer located on the inner side of the multi-layer pot body, a stainless steel layer located on the outer side of the multi-layer pot body, and an aluminum alloy interlayer structure located between the titanium metal layer and the stainless steel layer; wherein the titanium metal layer and the stainless steel layer are combined on both sides of the aluminum alloy interlayer structure through atomic diffusion bonding means.

[0008] In a preferred embodiment of the present application, the aluminum alloy interlayer structure comprises a first aluminum alloy material layer and two second aluminum alloy material layers attached to the opposite sides of the first aluminum alloy material layer; the tensile strength of the first aluminum alloy material layer is higher than that of the two second aluminum alloy material layers; and the first aluminum alloy material layer and the two second aluminum alloy material layers are combined together through atomic diffusion bonding means.

[0009] In a preferred embodiment of the present application, the first aluminum alloy material layer can be made of 3003 aluminum alloy, and the second aluminum alloy material layer can be made of 1050 aluminum alloy.

[0010] In a preferred embodiment of the present application, the surface of the titanium metal layer has a anti-sticking layer, which is one of titanium oxide, titanium nitride or titanium oxynitride film formed on the surface of the titanium metal layer by thermal oxidation, electrochemical oxidation, plasma oxidation or micro-arc oxidation.

[0011] In a preferred embodiment of the present application, the stainless steel layer is a magnetic stainless steel material layer.

[0012] One of the beneficial effects of the present application is that the aluminum alloy interlayer structure is arranged between the titanium metal layer and the stainless steel layer, and the titanium metal layer and the stainless steel layer and the aluminum alloy interlayer structure are combined together through diffusion bonding means, which overcomes the difficulty of combining titanium and stainless steel in the existing pot manufacturing method, and makes each metal layer of the multi-layer pot body combined through atomic diffusion bonding, so that each metal layer will not peel off, and has the same strength as the pot made of one-piece formed metal plate.

[0013] To further understand the features and technical contents of the present application, please refer to the following detailed description and drawings of the present application. However, the provided drawings are only used for reference and illustration, and are not used to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a combined side view schematic diagram of the first embodiment of the present application.

[0015] Figure 2 It is aFigure 1 Enlarged sectional view of the II part of the profile.

[0016] Figure 3 The schematic diagram of the first aluminum alloy material layer and the second aluminum alloy material layer of the aluminum alloy sandwich structure in a non-combined state.

[0017] Figure 4 The schematic diagram of the operation method for implementing the first diffusion bonding procedure of the present application to bond the first aluminum alloy material layer and the second aluminum alloy material layer into the aluminum alloy sandwich structure.

[0018] Figure 5 The schematic diagram of the titanium metal layer, the stainless steel layer and the aluminum alloy sandwich structure in a non-combined state.

[0019] Figure 6 The schematic diagram of the operation method for implementing the second diffusion bonding procedure of the present application to bond the titanium metal layer, the stainless steel layer and the aluminum alloy sandwich structure into the multi-layer composite base material for manufacturing the multi-layer pot body.

[0020] Figure 7 The schematic diagram of the operation method for implementing the pot forming step of the present application.

[0021] Figure 8 The schematic diagram of the operation method for implementing the trimming step of the present application.

[0022] Figure 9 The schematic diagram of another variation of the composite titanium metal pot of the present application.

[0023] Figure 10 The flowchart of the manufacturing method of the composite titanium metal pot of the present application. DETAILED DESCRIPTION

[0024] The following is to illustrate the embodiments of the composite titanium metal pot and the manufacturing method thereof of the present application through specific embodiments. The advantages and effects of the present application can be understood by the contents disclosed in the present specification. The present application can be implemented or applied through other different embodiments, and the details in the present specification can be modified and changed based on different viewpoints and applications without departing from the concept of the present application.

[0025] Referring to Figures 1 to 10 , the embodiments of the present application provide a composite titanium metal pot and a manufacturing method thereof. For the purpose of illustration, the present specification will first introduce the structure of the composite titanium metal pot 1, and then introduce the manufacturing method of the composite titanium metal pot 1.

[0026] As Figures 1 to 2As shown, the composite titanium cookware 1 of this utility model includes: a multi-layer cookware body 10, which 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 user grip.

[0027] The multi-layer cookware body 10 includes 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.

[0028] Among them, such as Figures 2 to 4 As shown, 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, and the second aluminum alloy material layer 22 can be made of 1050 aluminum alloy. 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.

[0029] 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.

[0030] like Figure 2 and Figure 5As shown, 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.

[0031] 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.

[0032] In a preferred embodiment of this 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 creating 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.

[0033] 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.

[0034] 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 contacting 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 composed of multiple layers of thin metal sheets, and the strength of the multi-layer cookware body 10 is comparable to that of a cookware made from a single, molded metal sheet.

[0035] Furthermore, since the atoms of aluminum, titanium, and stainless steel can easily diffuse into each other and form a eutectic structure, this 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 with titanium and stainless steel, thus reducing the difficulty of bonding the titanium layer 30 and the stainless steel layer 40 together.

[0036] The manufacturing method of this utility model is described below. Please refer to it. Figure 10 And at the same time refer to Figures 3 to 9 As shown, the manufacturing method of the composite titanium metal cookware 1 of this utility model 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.

[0037] In the metal sheet preparation step S1, aluminum alloy sheet, titanium sheet, and stainless steel sheet 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 are then surface-treated by polishing or grinding the joint surfaces to make them flat. 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 surface oxides and impurities.

[0038] The metal sheet preparation step S1 ensures that 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 are flat and free of oxides and impurities, allowing each metal layer to be bonded together through diffusion bonding.

[0039] refer to Figure 3 , Figure 4 As shown, 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.

[0040] like Figure 4 As shown, 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.

[0041] 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.

[0042] In a preferred embodiment of the present invention, in the first diffusion bonding step S2, a static pressure of 10 to 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 and 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.

[0043] refer to Figure 5 and Figure 6As shown, 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, so that the titanium metal layer 30, the stainless steel layer 40 and the aluminum alloy sandwich structure 20 diffuse bond together to form a multilayer composite substrate P used to manufacture the multilayer cookware body 10.

[0044] like Figure 6 As shown, 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 of the second aluminum alloy material layer 22 and the first aluminum alloy material layer 21 during the diffusion bonding process.

[0045] 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.

[0046] 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.

[0047] Such as 10 and Figure 7 As shown, 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.

[0048] refer to Figure 7In the illustrated embodiment, the multilayer composite substrate P is molded 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 mold the flat multilayer composite substrate P into a multilayer cookware body 10 with recessed spaces 11.

[0049] Special note, Figure 7 Although the method shown discloses the use of a molding die 70 to form the multi-layer cookware body 10, the present invention is not limited to this. 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.

[0050] Next reference Figure 10 and Figure 8 As shown, 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 cut edges of the multi-layer cookware body 10 to remove burrs. Figure 8 As shown, after the multi-layer composite substrate P is formed into a 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 removed 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 a rounded corner or chamfer.

[0051] 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 this 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.

[0052] 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 form the composite titanium cookware 1 of this utility model.

[0053] Furthermore, this utility model Figures 1 to 8In the illustrated embodiment, the disclosed composite titanium cookware 1 is in the form of a wok or frying pan. However, this invention is not limited to this; the composite titanium cookware 1 of this invention can also be in other different forms. Figure 9 In the illustrated embodiment, the composite titanium cookware 1 is a soup pot. Therefore, in this embodiment, the multi-layer cookware body 10 of the composite titanium cookware 1 forms a cylindrical container shape with considerable depth.

[0054] [Beneficial Effects of the Examples]

[0055] One of the beneficial effects of this utility model is that it uses an aluminum alloy sandwich structure between a titanium metal layer and a stainless steel layer, and then uses diffusion bonding 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.

[0056] Furthermore, the aluminum alloy sandwich structure of this utility model 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.

[0057] The above-disclosed content is only a preferred and feasible embodiment of the present utility model, and is not intended to limit the scope of the patent application of the present utility model. Therefore, all equivalent technical changes made using the contents of the present utility model specification and drawings are included in the scope of the patent application of the present utility model.

Claims

1. A composite titanium metal cookware, characterized by, The composite titanium metal pot comprises: a multi-layer pot body, which comprises a titanium metal layer located on the inner side of the multi-layer pot body, a stainless steel layer located on the outer side of the multi-layer pot body, and an aluminum alloy interlayer structure located between the titanium metal layer and the stainless steel layer; wherein the titanium metal layer and the stainless steel layer are combined on both sides of the aluminum alloy interlayer structure by atomic diffusion bonding means; the aluminum alloy interlayer structure comprises a first aluminum alloy material layer, and two second aluminum alloy material layers attached to the opposite sides of the first aluminum alloy material layer; the tensile strength of the first aluminum alloy material layer is higher than that of the two second aluminum alloy material layers; wherein the second aluminum alloy material layers are combined on both sides of the first aluminum alloy material layer by atomic diffusion bonding means, and are in close contact with the titanium metal layer and the stainless steel layer, respectively.

2. The composite titanium metal cookware according to claim 1, 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.

3. The composite titanium metal cookware of claim 1, wherein, The surface of the titanium metal layer has a non-stick layer, which is one of a titanium oxide, titanium nitride, or titanium oxynitride film formed on the surface of the titanium metal layer by thermal oxidation, electrochemical oxidation, plasma oxidation, or micro-arc oxidation.

4. The composite titanium metal cookware of claim 1, wherein, The stainless steel layer is made of magnetic stainless steel material.

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