Easy-to-Clean Glass Coating with Alkali Diffusion Barrier
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Solution Overview
Problem
Glass substrates subjected to heat treatment experience deterioration and variation in easy-to-clean properties due to alkali metal element diffusion from the substrate into the coating, leading to non-uniform coefficient of kinetic friction.
Innovation Solution
A glass article with a glass substrate that suppresses alkali metal element diffusion into the coating, featuring an inorganic substance-based easy-to-clean coating, which can include alkali-free or low-alkali glass, a dealkalized layer, or an underlayer, and is formed through a process that maintains the coating's integrity during heat treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat treatment is applied to the glass substrate, then the glass substrate can be processed or strengthened, but the easy-to-clean properties of the coating deteriorate due to alkali metal element diffusion
Solution Approach 1:
An underlayer is introduced between the glass substrate and the easy-to-clean coating to act as a barrier that prevents alkali metal elements from diffusing from the glass substrate into the coating during heat treatment, thereby protecting the coating's easy-to-clean properties while allowing the glass substrate to undergo necessary heat processing
Solution Approach 2:
The patent employs a composite structure consisting of the glass substrate, an intermediate underlayer, and the easy-to-clean coating. This multi-layer composite design allows each layer to fulfill its specific function: the glass substrate provides structural support, the underlayer prevents alkali diffusion, and the coating provides easy-to-clean properties
2Productivity
If heat treatment is applied to the glass substrate, then processing can be completed, but variation in easy-to-clean properties occurs depending on the region of the glass substrate
Solution Approach 1:
The underlayer serves as a uniform barrier across the entire glass substrate surface, preventing regional variations in alkali metal element diffusion that would otherwise cause non-uniform easy-to-clean properties in different areas of the coating after heat treatment
Solution Approach 2:
The underlayer creates a homogeneous protective barrier that ensures consistent prevention of alkali diffusion across all regions of the glass substrate, resulting in uniform easy-to-clean properties throughout the coating surface after heat treatment
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 effectively suppresses deterioration and variation in easy-to-clean properties, ensuring a low coefficient of kinetic friction and improved cleaning efficacy even after heat treatment.
Implementation Method 1
the glass substrate has a function or composition that suppresses diffusion of an alkali metal element into the coating
Data Source
Figure 1
AI summary
Provided is a coating-attached glass article including: a glass substrate; and an easy-to-clean coating on the glass substrate, wherein the glass substrate has a function or composition that suppresses diffusion of an alkali metal element into the coating, and the easy-to-clean coating contains an inorganic substance as a main component. The glass article satisfies at least one selected from the group consisting of the following (i) to (iv): (i) the glass substrate is formed of alkali-free glass; (ii) the glass substrate is formed of low-alkali glass; (iii) the glass substrate includes a dealkalized layer in a surface on a coating side; and (iv) an underlayer is provided between the glass substrate and the coating.