Coated Substrate with Yttrium Zirconium Layer for Hob Scratch Resistance
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Solution Overview
Problem
Existing scratch-resistant coatings for glass substrates used in hobs lack improved scratch resistance, heat resistance, resistance to alkaline and acidic solutions, gliding properties, adhesion, and protection against delamination.
Innovation Solution
A coated substrate with a layer comprising a composition of Yttrium and Zirconium, where the Zirconium content is 75 weight-% or less, and the Martens hardness of the coating is 4.5 GPa or more, providing enhanced scratch resistance and heat resistance, along with improved resistance to chemical solutions and reduced delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional scratch-resistant coatings are applied to glass substrates, then basic scratch protection is provided, but the scratch resistance, heat resistance, chemical resistance, and adhesion properties remain insufficient to meet increasingly high quality requirements
Solution Approach 1:
The patent applies composite materials by combining multiple elements (Zirconium, Yttrium, and optionally other metals) in a layered coating structure. The coating comprises at least two layers with different compositions and functions: a first layer with specific elemental composition for scratch resistance, and a second layer for heat and chemical resistance, creating a composite material system that achieves superior overall performance
Solution Approach 2:
The patent implements local quality by assigning different functional properties to different layers of the coating. The first layer is optimized for scratch resistance with specific hardness properties, while the second layer is optimized for heat and chemical resistance. Each layer has locally optimized composition and properties tailored to its specific function, rather than using a uniform coating throughout
2Strength
If higher hardness coatings are applied to improve scratch resistance, then scratch protection increases, but adhesion to the substrate deteriorates leading to delamination
Solution Approach 1:
The patent resolves this contradiction by creating a composite coating structure where the first layer provides high hardness for scratch resistance while the second layer provides strong adhesion to the substrate. The intermediate layer acts as a bonding interface, creating a gradient transition that maintains both scratch resistance and adhesion forces
Solution Approach 2:
The coating is segmented into multiple distinct layers, each with specific thickness and composition requirements. The first layer (2-10 μm) provides scratch resistance, the second layer (0.1-2 μm) provides adhesion, and optionally a third layer provides heat resistance. This segmentation allows each layer to specialize in one function without compromising the others
3Object-affected harmful factors
If conventional coatings are used, then basic functionality is achieved, but resistance to heat, alkaline solutions, and acidic solutions is insufficient
Solution Approach 1:
The patent achieves superior chemical resistance through composite materials by incorporating specific metal elements (Yttrium, Zirconium, and optionally other refractory metals) in controlled ratios. These elements form a composite coating structure with enhanced resistance to alkaline and acidic solutions, while the layered architecture provides functional differentiation for heat and chemical resistance
4Reliability
If multi-layer coatings are applied to improve overall performance, then scratch resistance, heat resistance, and chemical resistance improve, but production complexity and costs increase
Solution Approach 1:
The patent balances performance and manufacturability by defining specific composition ranges and thickness parameters for each layer that can be controlled during the coating process. The use of sputtering technology with defined power parameters and gas flows provides a manufacturable process for creating the composite coating structure with consistent quality
Solution Approach 2:
The patent specifies precise parameter ranges for coating thickness, elemental composition ratios, and deposition conditions that optimize both performance and manufacturability. By defining these parameters within specific ranges, the patent enables consistent reproduction of high-quality coatings while maintaining control over the manufacturing process
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 substrate exhibits significantly improved scratch resistance, heat resistance, and chemical resistance, with reduced delamination and enhanced gliding properties, making it suitable for various types of hobs.
Implementation Method 1
the Martens hardness of the coating is 4.5 GPa or more
Implementation Method 2
after a heat treatment, the color distance ΔE is 4.0 or less
Implementation Method 3
improved resistance to alkaline solutions; improved resistance to acidic solutions
Data Source
AI summary
Herein a specific coated substrate and a specific method for the production of a coated substrate is disclosed.