Glass-Ceramic Cooktop Coating Resists Scratches
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Solution Overview
Problem
Glass-ceramic plates used as cooktops or furniture surfaces are prone to scratches and coloration due to friction with utensils, which complicates maintenance and affects their aesthetic and functional properties.
Innovation Solution
A glass-ceramic product with a specific coating comprising a stack of layers, including a thick layer of hard material (such as silicon or aluminum nitride) and a thin layer with low friction coefficient (like titanium oxide or boron nitride), applied to the surface to reduce scratches and coloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass-ceramic plates are used as cooktops or furniture surfaces, then they provide mechanical strength and aesthetic appearance, but they become scratched and colored due to friction with utensils
Solution Approach 1:
The patent applies a composite coating structure consisting of multiple layers with different functions: a hard protective layer (such as aluminum oxide or silicon oxide) to resist scratches, a intermediate layer to prevent metal adhesion and coloration, and a top layer with low friction coefficient to reduce wear. This composite structure resolves the contradiction by combining materials with complementary properties to simultaneously achieve scratch resistance and prevent coloration while maintaining the mechanical strength of the glass-ceramic substrate.
Solution Approach 2:
The patent applies different coating materials and properties to different regions or layers of the surface. The underlying hard layer provides scratch resistance where needed, while the top layer with specific chemical composition prevents metal adhesion and coloration. This local differentiation of material properties allows the surface to simultaneously resist mechanical damage and prevent chemical discoloration without compromising the overall mechanical strength of the glass-ceramic plate.
2Object-affected harmful factors
If coatings are applied to glass-ceramic plates to reduce scratches, then scratch resistance improves, but the coatings can be detrimentally changed during cleaning or alter optical and mechanical properties
Solution Approach 1:
The patent carefully controls the chemical composition, thickness, and physical properties of each coating layer to ensure stability. The hard protective layer is designed with specific hardness and adhesion properties to resist scratches while maintaining durability during cleaning. The top layer is formulated with low friction coefficient and chemical inertness to prevent degradation during cleaning operations. By optimizing these parameters, the coating system provides scratch resistance without compromising reliability during maintenance.
Solution Approach 2:
The patent uses homogeneous material composition within each layer to ensure uniform performance and stability. The coating layers are applied with consistent thickness and composition to avoid weak points that could lead to deterioration during cleaning. This homogeneity ensures that the protective properties are evenly distributed across the surface, maintaining both scratch resistance and cleaning stability throughout the entire coated area.
3Object-affected harmful factors
If a thick hard layer is applied to reduce scratches, then scratch resistance improves, but the surface friction coefficient increases making it harder to clean
Solution Approach 1:
The patent divides the protective coating into multiple functional segments or layers. The lower layers consist of hard materials (such as aluminum oxide or silicon oxide) that provide scratch resistance, while the upper layer is composed of materials with low friction coefficient (such as fluorinated compounds or specific oxide combinations) that facilitate easy cleaning. This segmentation allows each layer to perform its specific function optimally without compromising the other, resolving the contradiction between scratch resistance and ease of cleaning.
Solution Approach 2:
The patent introduces an intermediary layer between the hard protective layer and the external environment. This intermediate layer has intermediate properties: it is sufficiently hard to protect the underlying structure but has low surface energy and friction to allow easy cleaning. This mediator layer transfers the mechanical protection function from the hard layer while providing the low-friction surface needed for easy maintenance, thus resolving the contradiction between durability and ease of operation.
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 coated glass-ceramic surfaces exhibit significant reduction in scratches and metal-induced coloration, maintaining mechanical strength and aesthetic appeal while being easy to clean and resistant to thermal shocks.
Implementation Method 1
a thick layer of hard material (such as silicon or aluminum nitride)
Implementation Method 2
a thin layer with low friction coefficient (like titanium oxide or boron nitride), applied to the surface to reduce scratches and coloration
Implementation Method 3
reduce scratches and coloration due to friction with utensils
Data Source
AI summary
A glass-ceramic article, includes at least one substrate, such as a plate, made of glass-ceramic, the substrate being coated in at least one zone with at least one stack formed 1) of at least one first layer of metal nitride or of semimetal nitride, the first layer exhibiting a thickness of at least 200 nm and a hardness of at least 14 GPa, and 2) of at least one second layer of metal oxide or of semimetal nitride, the second layer exhibiting a thickness of less than 14 nm and exhibiting a coefficient of friction of less than 0.25, the first and second layers being in contact with each other, the second layer being further from the substrate than the first layer.