Non-Stick Cookware Coating with Hard Enamel Scratch Resistance
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Solution Overview
Problem
Conventional non-stick coatings on culinary articles are fragile and lack sufficient corrosion resistance, with existing reinforcement methods being costly, energy-intensive, and prone to generating corrosion issues.
Innovation Solution
A culinary article with a metal support coated with a hard, rough, discontinuous enamel base and a non-stick coating comprising fluorocarbon resin, which forms a continuous sintered network, providing improved adhesion, scratch resistance, and corrosion resistance without requiring complex or energy-consuming equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sintered fluorocarbon resin coating is used, then non-stick properties and chemical/thermal resistance are achieved, but the coating becomes fragile and scratches easily
Solution Approach 1:
The patent applies composite materials by combining sintered fluorocarbon resin with a glass-based enamel layer. The enamel layer contains silica, alumina, and other oxides that provide hardness and scratch resistance, while the fluorocarbon resin maintains non-stick properties. This composite structure resolves the contradiction between coating durability and scratch resistance.
Solution Approach 2:
The patent changes the chemical composition parameters of the coating system by introducing specific oxide ratios (silica 30-70%, alumina 5-20%, etc.) and controlling the thickness of each layer (enamel layer 5-20 μm, fluorocarbon layer 20-50 μm). These parameter changes enable the coating to simultaneously achieve scratch resistance from the enamel and non-stick properties from the fluorocarbon resin.
2Strength
If hard mineral fillers are added to the primer layer, then mechanical strength is reinforced, but the coating loses cohesion beyond 15% filler content
Solution Approach 1:
The patent introduces a glass-based enamel layer as an intermediary between the metal support and the fluorocarbon coating. This enamel layer acts as a mediator that provides mechanical strength through its glass matrix and embedded crystalline phases, while maintaining cohesion through its amorphous structure. The enamel layer thickness (5-20 μm) is optimized to provide strength without compromising overall coating cohesion.
Solution Approach 2:
The patent changes the composition parameters by using a glass-based enamel with specific oxide ratios (silica 30-70%, alumina 5-20%, boron oxide 5-20%, calcium oxide 5-20%) rather than simple mineral fillers. The glass matrix provides a continuous phase that maintains cohesion even at higher filler equivalents, resolving the contradiction between strength and cohesion.
3Object-affected harmful factors
If alumina base is formed by hard anodization, then scratch resistance is improved, but energy consumption increases significantly
Solution Approach 1:
The patent replaces the electrochemical anodization process with a thermal spray deposition process for forming the hard base layer. Instead of using high electrical currents for anodization, the enamel layer is applied by thermal spraying or dip-coating followed by controlled firing at 600-800°C. This substitution dramatically reduces energy consumption while achieving comparable or superior scratch resistance through the glass-ceramic enamel structure.
Solution Approach 2:
The patent changes the formation parameters from electrochemical (anodization voltage, current density, electrolyte composition) to thermal parameters (firing temperature 600-800°C, heating rate, hold time). This parameter change enables the formation of a hard, scratch-resistant enamel layer with lower energy input compared to hard anodization.
4Object-affected harmful factors
If electric arc spraying is used to form hard metallic layer, then abrasion resistance is improved, but equipment cost and complexity increase
Solution Approach 1:
The patent replaces complex electric arc spraying equipment with simpler thermal spray or dip-coating equipment. The hard base layer is formed by applying an enamel-containing slurry followed by controlled thermal firing, eliminating the need for expensive arc spraying apparatus. This substitution maintains abrasion resistance through the enamel's glass-ceramic structure while dramatically simplifying equipment requirements.
Solution Approach 2:
The patent uses a consumable enamel slurry that is applied and then fired to form the hard base layer. This approach uses inexpensive, easily preparable materials (glass powder, metal oxides, organic vehicle) that can be applied with simple equipment, replacing expensive, complex arc spraying systems with a more economical, batch-process approach.
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 significantly enhances the physical, chemical, and mechanical performance of the non-stick coating, multiplying abrasion resistance by at least five while maintaining non-stick properties and adhering to food safety regulations.
Implementation Method 1
a non-stick coating which comprises at least one layer comprising at least one fluorocarbon resin alone or mixed with a thermostable bonding resin, this (these) resin(s) forming a continuous sintered network
Implementation Method 2
a hard base, then with a non-stick coating covering said hard base, said hard base being a rough layer
Data Source
Figure 1~2
AI summary
The present invention relates to a culinary article (1) comprising a metal substrate (2) having a concave inner face (21) intended to be placed on the side of food which can be introduced into said article (1) and a convex outer face (22) intended to be placed facing a heat source, said inner face being coated in succession, starting from said substrate (2), with a hard enamel base (3), which is rough and contains no lead or cadmium, and then with a non-stick coating (4) covering said hard layer (3). The present invention also relates to a method of manufacturing such an article (1).