UV Transmission Glass Composition for Weather Resistance
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Solution Overview
Problem
UV transmitting glasses with high transmittance in the deep UV region often compromise on weather resistance, leading to shorter product life in electronic devices due to the use of boron oxide-rich compositions.
Innovation Solution
A UV transmitting glass composition is formulated with specific ranges of SiO2, Al2O3, B2O3, and other oxides to achieve high transmittance while maintaining high weather resistance, including a glass composition of 55% to 80% SiO2, 1% to 25% Al2O3, 10.8% to 30% B2O3, and additional oxides within specified limits, along with specific thermal and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a boron oxide-rich glass composition is used to enhance UV transmittance, then the transmittance in the deep UV region is improved, but the weather resistance is lowered
Solution Approach 1:
The invention changes the chemical composition parameters of the glass by strictly limiting B2O3 content to 10-30 mass% (avoiding boron oxide-rich composition) while optimizing SiO2 (55-80 mass%), Al2O3 (1-25 mass%), and alkali metal oxide contents. This parameter optimization resolves the contradiction by achieving high UV transmittance (≥38% at 200 nm) without the weather resistance degradation associated with high boron oxide content
Solution Approach 2:
The invention creates a composite glass system combining multiple oxide components (SiO2, B2O3, Al2O3, and alkali metal oxides) in specific proportions. This composite approach allows the glass to simultaneously achieve high UV transmittance and good weather resistance by balancing the properties of different components rather than relying on a single boron oxide-rich composition
2Power
If UV transmittance is prioritized through specific glass composition, then sterilization power is improved, but product life is shortened
Solution Approach 1:
The invention optimizes glass composition parameters to achieve high UV transmittance (≥38% at 200 nm) while maintaining weather resistance, thereby extending product life. The specific composition ranges (SiO2: 55-80 mass%, B2O3: 10-30 mass%, Al2O3: 1-25 mass%) balance sterilization effectiveness with durability
Solution Approach 2:
The invention avoids using disposable or short-lived glass compositions by developing a weather-resistant formulation that maintains high UV transmittance. This eliminates the need for frequent replacement, making the glass suitable for long-term sterilization applications
Data Source
AI summary
Devised is a UV transmitting glass having a high transmittance in a deep UV region, and also having high weather resistance. The UV transmitting glass of the present invention is characterized by including as a glass composition, in terms of mass %, 55% to 80% of SiO2, 1% to 25% of Al2O3, 10.8% to 30% of B2O3, 0% to 10% of Na2O, 0% to less than 1.6% of K2O, 0.1% to 10% of Li2O+Na2O+K2O, 0% to 5% of BaO, and 0% to 1% of Cl, and having an external transmittance at a thickness of 0.5 mm and a wavelength of 200 nm of 38% or more.