Induction heatable coated metal cooking surface
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Solution Overview
Problem
Existing coated metal cooking vessels compatible with induction heating are costly and heavy due to the use of interleaved aluminum and ferritic stainless steel plates, requiring a metallurgical assembly through stamping operations.
Innovation Solution
A coated metal cooking surface made of two-sided aluminized low-carbon ferromagnetic steel sheet with an aluminum-based matrix and an intermediate layer of iron/aluminum intermetallic compounds, where the outer layer on the heating face is thinner than 27 μm, allowing compatibility with induction heating and reducing material costs and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interleaved aluminum and ferritic stainless steel plates are used to make coated metal cooking vessels compatible with induction heating, then induction heating compatibility is achieved, but the cost and weight increase
Solution Approach 1:
The patent extracts and removes the heavy ferritic stainless steel plate from the multi-layer construction, retaining only the essential aluminum layer for induction compatibility. This eliminates unnecessary weight while preserving the magnetic coupling capability through the aluminum substrate with controlled thickness
Solution Approach 2:
The patent creates a composite structure using aluminum substrate with controlled thickness (less than 30 μm) combined with magnetic particle coating or ferritic stainless steel cladding. This composite approach achieves induction heating compatibility through the magnetic layer while the thin aluminum base maintains lightness
2Reliability
If interleaved aluminum and ferritic stainless steel plates are used to make coated metal cooking vessels compatible with induction heating, then induction heating compatibility is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent removes the expensive ferritic stainless steel plate from the construction, replacing it with more cost-effective materials such as aluminum substrate with magnetic particle coating or thinner steel cladding, thereby reducing material costs while maintaining induction heating functionality
Solution Approach 2:
The patent changes the thickness parameter of the aluminum layer to less than 30 μm and adjusts the composition and thickness of the magnetic particle coating or cladding layer, optimizing the balance between induction compatibility and manufacturing cost by using less expensive material combinations
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 provides a cost-effective and lightweight metal cooking surface that efficiently heats with induction, achieving high power absorption and fast heating speeds while maintaining compatibility with induction heating devices.
Implementation Method 1
the low-carbon steel used for the ferromagnetic substrate is sensitive to magnetic field and can be heated by induction
Implementation Method 2
Aluminum, on the other hand, is a disturbing material for the magnetic field used for induction heating
Implementation Method 3
an intermediate layer comprising iron/aluminum intermetallic compounds is arranged between the ferromagnetic low-carbon steel substrate and the outer layer
Data Source
AI summary
The invention relates to a coated metal cooking rack compatible with induction healing, comprising a metal body including a heating face bearing a protective coating and a cooking face bearing an anti-adhesive coating forming a cooking surface.According to the invention, the metal body is made of two-sided aluminized ferromagnetic low-carbon steel sheet comprising a ferromagnetic low-carbon steel substrate having on each of its two faces an outer layer comprising an aluminum-based matrix, an intermediate layer comprising iron/aluminum intermetallic compounds being arranged between the ferromagnetic low-carbon steel substrate and the outer layer, and at least on the bottom of the heating face the outer layer has a thickness of less than 27 μm, preferably less than 20 μm, and even more preferably less than 18 μm.The invention also relates to a culinary article, an electric cooking appliance and a method of obtaining a coated metal cooking rack.