Multi-layer coated metal cooking support that can be heated by induction
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Solution Overview
Problem
Existing metal cooking supports for induction heating are costly and heavy due to the use of ferritic stainless steel and aluminum plates, and they often suffer from hot spots and overheating issues.
Innovation Solution
A coated multilayer metal cooking support using a low-carbon steel ferromagnetic substrate with an aluminum-based coating, where the aluminum layer is optimized to be non-disruptive to the magnetic field, reducing costs and weight, and featuring a protective and non-stick coating to prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ferritic stainless steel and aluminum plates are used to produce coated metal cooking supports, then induction heating compatibility is achieved, but cost and weight increase
Solution Approach 1:
The patent uses a composite structure consisting of a ferromagnetic substrate (low-carbon steel) metallurgically bonded to an aluminum-based coating layer. This composite material approach allows the cooking support to maintain induction heating compatibility through the ferromagnetic substrate while the aluminum coating provides desired cooking surface properties, achieving a balance between functionality and weight reduction compared to using thick ferritic stainless steel plates.
Solution Approach 2:
The invention applies different material properties to different layers of the cooking support: the substrate layer provides ferromagnetic properties for induction heating compatibility, while the aluminum-based coating layer provides non-stick and thermal distribution properties. This local differentiation of material quality allows each layer to perform its specific function optimally without requiring the entire structure to be made of heavy ferritic stainless steel.
2Reliability
If ferritic stainless steel and aluminum plates are assembled using striking operation, then induction heating compatibility is achieved, but manufacturing cost increases
Solution Approach 1:
The patent changes the material parameters by using low-carbon steel (with specific carbon content ranges) as the substrate instead of ferritic stainless steel, and controls the thickness and composition of the aluminum-based coating. These parameter changes enable the achievement of induction heating compatibility through more cost-effective materials and simplified manufacturing processes without requiring expensive striking operations to assemble multiple plates.
Solution Approach 2:
The metallurgical bonding of the aluminum-based coating to the low-carbon steel substrate creates a integrated composite structure that achieves induction heating compatibility through the ferromagnetic substrate properties, eliminating the need for complex assembly operations and reducing manufacturing costs compared to assembling multiple separate plates.
3Weight of moving object
If aluminum sheet is used in the cooking support, then weight is reduced, but hot spots and overheating risk increase
Solution Approach 1:
The patent creates a composite structure where the ferromagnetic low-carbon steel substrate provides excellent magnetic properties for uniform induction heating, while the aluminum-based coating layer contributes to heat distribution and provides non-stick properties. This composite approach leverages the strengths of both materials: the steel substrate prevents hot spots through uniform magnetic heating, while the aluminum coating maintains lightweight properties and provides desired cooking surface characteristics.
Solution Approach 2:
The invention assigns different functional qualities to different layers: the substrate layer handles the magnetic field interaction and primary heat generation with uniform distribution, while the aluminum coating layer provides localized non-stick properties and thermal management at the cooking surface. This local quality differentiation allows the aluminum to be used without creating hot spots, as the substrate controls the heating uniformity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution results in a cost-effective, lightweight cooking support that efficiently heats evenly, minimizing hot spots and ensuring compatibility with induction heating devices while maintaining high thermal homogeneity and energy efficiency.
Implementation Method 1
The low carbon steel ferromagnetic substrate is sensitive to the magnetic field used for induction heating and can be heated by induction
Implementation Method 2
The low carbon steel ferromagnetic substrate is sensitive to the magnetic field
Implementation Method 3
during the aluminization of a steel sheet, an intermetallic reaction layer is formed at the interface between the steel and the aluminum
Implementation Method 4
The aluminum sheet makes it possible to limit hot spots and therefore the risk of overheating of the non-stick coating forming the cooking surface
Data Source
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Figure 3
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AI summary
The invention relates to a coated multilayer metal cooking vessel (100) compatible with induction heating, comprising a metal body (110) having a heating face (120) bearing a protective coating (121) and a cooking face (130) bearing a non-stick coating (131) forming a cooking surface (132). According to the invention, the metal body (110) comprises an aluminum sheet (102) which is metallurgically bonded to a double-faced aluminized low-carbon ferromagnetic steel sheet (101) forming the heating face (120), the double-faced aluminized low-carbon ferromagnetic steel sheet (103) comprising a low-carbon ferromagnetic steel substrate (111) having on each of its two faces an outer layer (112) comprising an aluminum-based matrix, an intermediate layer comprising iron/aluminum intermetallic compounds which are arranged between the low-carbon ferromagnetic steel substrate (111) and the outer layer (112), and, at least on the bottom (122) of the heating face (120), the outer layer (112) has a thickness of less than 27 µm, preferably less than 20 µm, and more preferably less than 18 µm. The invention also relates to a culinary article, an electrical cooking appliance and a method for obtaining a coated metal cooking vessel.