Copper Cookware Multilayer Ceramic Coating for Tarnish-Free Durability
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Solution Overview
Problem
Cookware materials like stainless steel and copper suffer from issues such as poor heat conductivity, discoloration, scratching, and ion leaching, while existing coatings like perfluorocarbon and ceramic coatings have limitations in durability and adhesion, especially when used with acidic or salty foods at high temperatures.
Innovation Solution
A multilayer ceramic coating system for copper cookware, comprising a combination cathodic arc and sputtered bonding layer and a PVD nitride or carbonitride layer, providing excellent adhesion, corrosion resistance, and thermal stability, which is stick-resistant and tarnish-free, and maintains the appearance of metal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If copper is used as cookware material, then heat conductivity is improved, but durability and resistance to scratching are worsened
Solution Approach 1:
The patent applies composite materials by depositing a multilayer ceramic coating system on copper cookware. The coating includes a bonding layer (e.g., chromium, titanium, or stainless steel) and a topcoat layer (e.g., aluminum oxide, titanium oxide, or silicon oxide), creating a composite structure that combines the excellent heat conductivity of copper with the durability and scratch resistance of ceramic materials.
2Use of energy by moving object
If copper is used as cookware material, then heat conductivity is improved, but resistance to tarnishing and corrosion is worsened
Solution Approach 1:
The patent uses composite materials by applying a multilayer ceramic coating system that includes a bonding layer and a topcoat layer. This composite structure protects the copper substrate from tarnishing and corrosion while preserving its excellent heat conductivity properties.
Solution Approach 2:
The ceramic coating acts as an intermediary barrier between the copper cookware and the corrosive environment. The bonding layer adheres to the copper surface, and the topcoat layer provides chemical resistance, preventing direct contact between copper and tarnishing or corrosive agents.
3Ease of operation
If perfluorocarbon coating is applied, then non-stick properties are improved, but durability and adhesion at high temperatures are worsened
Solution Approach 1:
The patent changes the material parameters by replacing perfluorocarbon coating with inorganic ceramic materials (aluminum oxide, titanium oxide, silicon oxide) that have higher thermal stability and adhesion. These ceramic materials maintain non-stick properties while withstanding high cooking temperatures without degrading or losing adhesion.
Solution Approach 2:
The patent applies a composite coating structure with a bonding layer (chromium, titanium, or stainless steel) and a topcoat layer (ceramic material). This composite structure provides both non-stick properties and enhanced durability at high temperatures, overcoming the limitations of perfluorocarbon coatings.
4Reliability
If ceramic coating is applied, then durability and corrosion resistance are improved, but adhesion and scratch resistance are worsened
Solution Approach 1:
The patent applies a composite multilayer coating system consisting of a bonding layer (chromium, titanium, or stainless steel) and a topcoat layer (aluminum oxide, titanium oxide, or silicon oxide). The bonding layer provides strong adhesion to the copper substrate, while the topcoat layer provides corrosion resistance and durability, achieving both goals simultaneously.
Solution Approach 2:
The bonding layer acts as an intermediary between the copper substrate and the ceramic topcoat layer. It provides mechanical anchoring and chemical bonding to the copper surface, ensuring strong adhesion, while the topcoat layer provides the protective ceramic properties of corrosion resistance and durability.
5Reliability
If stainless steel is used as cookware material, then durability and strength are improved, but heat conductivity is worsened
Solution Approach 1:
The patent creates a composite structure with copper as the base material (providing excellent heat conductivity) and a multilayer ceramic coating (providing durability and strength). This composite structure achieves both high heat conductivity and durability, overcoming the trade-off between these properties.
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 multilayer coating enhances the durability and heat conductivity of copper cookware, making it suitable for high-temperature use with both acidic and salty foods, while being dishwasher-safe and resistant to scratches and discoloration, with improved ease of cleaning and longer lifespan compared to clad stainless steel and copper cookware.
Implementation Method 1
a combination cathodic arc and sputtered bonding layer
Implementation Method 2
a combination cathodic arc and sputtered bonding layer
Implementation Method 3
a PVD nitride or carbonitride layer
Data Source
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AI summary
Soft and porous material is coated with a multilayer ceramic coating by physical vapor deposition. The coated material is suitable for use as foodware, particularly, a copper foodware article including a plain copper substrate, a base coating, and a ceramic coating. The base coating is deposited by sputtering and cathodic arc in combination, providing the good corrosion resistance and adhesion to the substrate. The ceramic coating includes a PVD nitride or carbonitride layer, providing a tarnish-free surface, good durability, and thermal stability. The coated copper foodware article has the same heat conductivity as pure copper, good corrosion resistance, high durability, excellent cooking, and ease of cleaning. A metal article having a multilayer coating and a method of making a metal article are also described.