Silane Coating Strengthens Glass Without Brittleness
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Solution Overview
Problem
Glass strength significantly deteriorates upon exposure to atmospheric moisture, leading to micro-crack formation and reduced mechanical integrity, with existing strengthening methods having limitations such as compositional restrictions and brittleness, especially in thin glass applications like smartphones and large flat screens.
Innovation Solution
A hydrolytic polycondensation product of alkoxysilane with metal or metalloid oxides/alkoxides in the presence of water and a catalyst, forming a coating that covalently bonds with glass to heal surface defects, enhance fracture toughness, and provide abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ion exchange or thermal tempering is used to improve glass strength, then glass strength increases, but the method is limited by compositional restrictions and does not work below certain glass thicknesses
Solution Approach 1:
The patent changes the fundamental parameter of glass strengthening from bulk modification (ion exchange, thermal tempering) to surface coating with controlled thickness (5-50 nm). This allows the method to work on thin glass substrates and various glass compositions without the limitations of traditional methods.
Solution Approach 2:
The patent creates a composite structure by depositing a silane-based coating layer on the glass surface. The coating forms covalent bonds with the glass substrate, creating a composite material system that combines the properties of both glass and silane polymer, providing strengthening without compositional restrictions.
2Strength
If inorganic coatings are applied to improve hardness and abrasion resistance, then abrasion resistance increases, but the coating becomes brittle and develops micro-cracks
Solution Approach 1:
The patent changes the chemical composition parameter of the coating from purely inorganic (brittle) to organometallic silane-based (flexible yet hard). The silane coating provides both hardness for abrasion resistance and organic flexibility to prevent brittleness and micro-crack formation.
Solution Approach 2:
The patent creates an organometallic composite coating system where organic silane groups provide flexibility and inorganic metal oxide groups provide hardness. This composite structure simultaneously achieves abrasion resistance and prevents brittleness, eliminating the trade-off between these properties.
3Weight of stationary object
If glass thickness is reduced to meet design requirements, then device weight and material usage decrease, but the effectiveness of traditional compressive layer methods is lost
Solution Approach 1:
The patent changes the scale parameter of the strengthening layer from micrometer/thinner compressive layers to nanometer-scale coating (5-50 nm). This nanoscale coating is effective even on ultra-thin glass substrates where traditional compressive layers cannot be formed, maintaining strength while enabling weight reduction.
4Strength
If alkali ions are present in glass for chemical tempering, then glass strength improves through ion exchange, but the ions attack and damage electronic components
Solution Approach 1:
The patent extracts the strengthening function from the bulk glass composition (which requires alkali ions) and relocates it to the surface coating. This eliminates the need for alkali ions in the glass, preventing corrosion of electronic components while maintaining glass strength through the silane coating.
Solution Approach 2:
The silane coating acts as an intermediary layer between the glass substrate and the external environment. It provides the strengthening function that previously required alkali ions, while being chemically inert to electronic components, thus mediating between the need for strength and the need to protect electronics.
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 coating significantly increases glass strength by up to 10000% while maintaining non-brittleness, preventing crack propagation and devitrification, and offering improved chemical and abrasion resistance, suitable for thin glass applications.
Implementation Method 1
the hydrolytic polycondensation product of one or more alkoxysilane(s) with one or more metal or metalloid oxide(s) and/or one or more metal or metalloid alkoxide(s) in the presence of water and a catalyst and/or trigger
Implementation Method 2
creating a covalent bond between the coating and the glass, thereby healing the defects
Data Source
AI summary
The present invention relates to the use of a coating for improving glass strength and fracture toughness comprising the hydrolytic polycondensation product of one or more alkoxysilane(s) with one or more metal oxide(s) and/or metal alkoxide(s) in the presence of water and a catalyst.