High CTE Potassium Borosilicate Glass Fusion Forming
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing glass compositions for electronic devices require additional processing steps like thermal tempering or ion exchange to enhance strength, which increases costs and manufacturing risks, and there is a need for alternative compositions that can provide strength without these processes.
Innovation Solution
A glass composition with a high coefficient of thermal expansion (≥75×10^-7/°C) and liquidus viscosity (≥25 kPa·s) is developed, comprising 70-80 mol.% SiO2, 0-8 mol.% Al2O3, 3-10 mol.% B2O3, 0-15 mol.% K2O, and 5-6 mol.% alkaline earth oxide, suitable for fusion forming processes, eliminating the need for thermal tempering or ion exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermal tempering or ion exchange treatment is applied to strengthen glass articles, then the strength and durability of the glass are improved, but the manufacturing cost increases and the risk of damage during processing increases
Solution Approach 1:
The patent modifies the chemical composition parameters of the glass, specifically incorporating 10-15 mol% K2O and 5-6 mol% alkaline earth oxide (SrO or BaO) with controlled Al2O3 content (0-8 mol%), to achieve inherent strength without requiring additional thermal tempering or ion exchange processes
Solution Approach 2:
The glass composition is designed to self-strengthen through its inherent chemical structure, eliminating the need for external strengthening processes. The specific oxide ratios create a glass network that naturally resists damage without requiring post-forming treatment
2Strength
If thermal tempering or ion exchange treatment is applied to strengthen glass articles, then the strength and durability of the glass are improved, but the manufacturing complexity and handling requirements increase
Solution Approach 1:
The patent extracts and eliminates the need for separate thermal tempering and ion exchange processing steps by incorporating strength-enhancing oxide components directly into the base glass composition, simplifying the overall manufacturing process to a single forming operation
Solution Approach 2:
The modified glass composition performs multiple functions simultaneously: it provides the base structural properties of glass while also incorporating strength-enhancing chemical components, eliminating the need for separate strengthening processes
3Strength
If additional processing steps are applied to strengthen glass articles, then the strength is improved, but the risk of damage during handling increases
Solution Approach 1:
The glass is pre-strengthened through its chemical composition design during the forming process itself, before any subsequent handling or processing occurs. The 10-15 mol% K2O and 5-6 mol% alkaline earth oxide create inherent strength that protects the glass during transportation and assembly operations
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 glass composition achieves enhanced strength and durability for electronic devices without additional processing, reducing production costs and manufacturing risks, while maintaining high-quality homogeneous glass with consistent flow behavior.
Implementation Method 1
The glass composition comprises a coefficient of thermal expansion which is greater than or equal to 75×10^-7/°C
Data Source
Figure 1~2
AI summary
High CTE glass compositions and laminated glass articles formed from the same are described. In one embodiment, a glass composition may include from about 70 mol.% to about 80 mol.% SiO2, from about 0 mol.% to about 8 mol.% Al2O3, and from about 3 mol.% to about 10 mol.% B2O3 as glass formers. The glass composition may further include alkali oxides such as from about 0 mol.% to about 2 mol.% Na2O and from about 10 mol.% to about 15 mol.% K2O. In addition, the glass composition may include from about 5 mol.% to about 6 mol.% of alkaline earth oxide. The alkaline earth oxide may include at least one of CaO, SrO, and BaO. However, the glass composition may be substantially free from MgO. The glass composition may be used in a laminated glass article, such as a laminated glass article formed by a fusion laminate process.