Graphite-Core Cookware Structure for Lightweight Heat Conduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cookware manufactured using conventional roll-bonding techniques is heavy and lacks optimal thermal characteristics, necessitating the development of new methods for producing cookware with improved thermal conductivity and reduced weight through solid state bonding.
Innovation Solution
The use of a multi-layer bonded composite structure featuring an inner and outer metal layer with a core layer comprising perforated graphite plates and a metal core plate, where the metal core plate is extruded through the holes of the graphite plates and metallurgically bonded to the inner and outer layers, enhancing thermal conductivity and reducing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If conventional roll-bonding techniques are used to manufacture multi-layer bonded cookware, then the cookware achieves adequate structural integrity, but the cookware becomes heavy and lacks optimal thermal characteristics
Solution Approach 1:
The patent employs a composite structure consisting of a stainless steel outer layer, an aluminum intermediate layer, and a graphite core layer. This multi-material composite approach leverages the high thermal conductivity of graphite and aluminum while maintaining the structural integrity and corrosion resistance of stainless steel, thereby reducing overall weight while optimizing thermal characteristics
Solution Approach 2:
The invention applies different materials to different regions of the cookware structure based on functional requirements. The graphite core is positioned at the bottom where maximum thermal conductivity is needed, the aluminum layer provides intermediate bonding and thermal transfer, while the stainless steel outer layer provides structural strength and durability. This localized material assignment optimizes both weight and thermal performance
2Temperature
If aluminum or copper layers are bonded to stainless steel to improve thermal conductivity, then thermal characteristics improve, but the cookware weight increases
Solution Approach 1:
The patent creates a tri-layer composite structure where graphite serves as the core thermal conductor, aluminum provides intermediate bonding and thermal transfer, and stainless steel offers structural integrity. This composite configuration achieves superior thermal conductivity without the weight penalty of traditional aluminum-copper-stainless steel combinations, as graphite has high thermal conductivity at lower density
Solution Approach 2:
The invention changes the material parameter selection by substituting traditional copper or aluminum core materials with graphite, which offers comparable or superior thermal conductivity at reduced weight. The thickness parameters of each layer are also optimized to achieve the desired thermal performance while minimizing overall weight
3Temperature
If solid state bonding techniques are used to reduce weight and improve thermal characteristics, then thermal conductivity and weight improve, but the manufacturing process becomes more complex
Solution Approach 1:
The patent employs preliminary surface preparation and positioning of layers before the solid state bonding process. The layers are pre-aligned and secured in the correct sequence (stainless steel-aluminum-graphite-aluminum-stainless steel), and surface treatments are applied in advance to facilitate bonding, thereby reducing the complexity of the actual bonding operation
Solution Approach 2:
The invention replaces conventional mechanical roll-bonding techniques with solid state bonding, which uses heat and pressure applied over time to create metallurgical bonds between layers. This substitution eliminates the need for complex rolling equipment and multiple pass operations, simplifying the overall manufacturing system while achieving superior bond strength and thermal characteristics
4Ease of manufacture
If conventional roll-bonding methods are used, then the manufacturing process is straightforward, but scrap losses increase and materials difficult to bond cannot be used
Solution Approach 1:
The patent replaces conventional roll-bonding with solid state bonding, which allows for more precise control of the bonding process and better accommodation of material variations. This substitution reduces scrap losses by enabling successful bonding of materials that are difficult or impossible to bond using traditional mechanical rolling methods
Solution Approach 2:
The invention changes the bonding parameters from mechanical rolling to thermal and pressure application over time. This parameter change enables the bonding of dissimilar materials with different physical properties, including graphite, which has unique bonding characteristics that are incompatible with conventional roll-bonding processes, thereby reducing material waste
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
This approach results in cookware with improved thermal characteristics and reduced weight, offering better heat distribution and energy efficiency while minimizing scrap losses and allowing the use of materials difficult to bond via conventional methods.
Implementation Method 1
The use of a multi-layer bonded composite structure featuring an inner and outer metal layer with a core layer comprising perforated graphite plates and a metal core plate, where the metal core plate is extruded through the holes of the graphite plates and metallurgically bonded to the inner and outer layers
Implementation Method 2
the metal core plate is extruded through the holes of the graphite plates and metallurgically bonded to the inner and outer layers
Implementation Method 3
cookware having a graphite core... higher level of thermal conductivity... improved thermal characteristics... better heat distribution
Data Source
AI summary
Provided is an article of cookware and a method of making the same. The cookware has a multi-layer bonded composite wall structure having an inner metal layer and an outer metal layer, and a core layer between the inner layer and the outer layer. The core layer has at least two perforated graphite plates, each plate having a plurality of spaced-apart holes formed therethrough, and at least one intermediate metal element disposed between the at least two perforated graphite plates and extending through the plurality of spaced-apart holes of each of the at least two perforated graphite plates. The at least one intermediate metal element is metallurgically bonded to the inner layer and the outer layer at least through the plurality of spaced-apart holes.