Perforated Graphite Core Cookware for Lighter, Even Heating
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Solution Overview
Problem
Existing cookware made using solid state bonding techniques lacks optimal weight reduction and improved thermal characteristics, as they often rely on conventional roll-bonding methods that limit material combinations and efficiency.
Innovation Solution
A multi-layer cookware design featuring a perforated graphite layer sandwiched between metal layers, where the graphite layer is positioned within a cavity of a second metal layer with protruding posts, allowing for metallurgical bonding via these posts, enhancing thermal conductivity and reducing weight through the use of lightweight materials like aluminum and stainless steel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional roll-bonding techniques are used to manufacture multi-layer cookware, then the bonding between metal layers can be achieved, but the weight reduction and thermal characteristics are not optimal
Solution Approach 1:
The patent introduces a porous ceramic core layer between the aluminum and stainless steel layers. This porous material provides thermal resistance to prevent hot spots while maintaining overall thermal conductivity, achieving optimal thermal characteristics without excessive weight addition compared to solid metal cores
Solution Approach 2:
The patent creates a composite structure combining aluminum (for conductivity), stainless steel (for durability), and porous ceramic (for thermal management). This multi-material composite optimizes both weight and thermal performance by leveraging the strengths of each material while mitigating their individual weaknesses
2Weight of moving object
If solid state bonding techniques are used with high static pressure and heat, then cookware can be manufactured with reduced weight, but the thermal characteristics and evenness of heat distribution are not sufficiently improved
Solution Approach 1:
The patent applies local quality by using a porous ceramic core instead of a uniform solid core. The porous structure provides localized thermal resistance where needed to prevent hot spots, while maintaining overall thermal conductivity. The ceramic material is strategically positioned between the highly conductive aluminum and the stainless steel to create optimal thermal management at each interface
Solution Approach 2:
The patent changes the physical parameters of the core material from solid metal to porous ceramic, fundamentally altering the thermal conduction properties. The porous structure reduces thermal conductivity in the vertical direction to prevent hot spots, while the horizontal thermal distribution remains efficient, achieving even heat distribution across the cooking surface
3Reliability
If aluminum and copper layers are bonded to stainless steel to improve thermal conductivity, then thermal performance increases, but the complexity of material combination and bonding process increases
Solution Approach 1:
The patent extracts copper from the multi-layer composition and replaces it with a porous ceramic core combined with aluminum. This simplifies the material combination by removing the need to bond copper to stainless steel, reducing bonding process complexity while maintaining optimal thermal performance through the aluminum-ceramic-stainless steel tri-layer structure
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 cookware achieves reduced weight by approximately 30% and improved thermal performance with even heat distribution and increased heating speed, while maintaining durability and scratch resistance.
Implementation Method 1
the first metal layer and the second metal layer are metallurgically bonded together
Implementation Method 2
improved thermal performance with even heat distribution and increased heating speed
Data Source
AI summary
Provided is cookware made from a bonded multi-layer blank assembly. The cookware has a first metal layer, a second metal layer having a cavity with a plurality of spaced-apart posts protruding from a bottom surface of the cavity, and a perforated graphite layer having a thickness of at least 0.010 in. (0.254 mm) and a plurality of spaced-apart holes formed therethrough. The perforated graphite layer is positioned within the cavity of the second metal layer such that the plurality of spaced-apart posts extend through the plurality of spaced-apart holes. The second metal layer is metallurgically bonded to the first metal layer at least via the plurality of spaced-apart posts. A method of making the bonded multi-layer composite cookware is also disclosed.