Flat Glass High Transmittance Composition
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Solution Overview
Problem
Current glass compositions fail to achieve high transmittance across the entire wavelength range from 200 nm to 1500 nm while maintaining low thermal expansion, high chemical resistance, and mechanical strength, often compromising on specific applications due to adjustments for optimized properties.
Innovation Solution
A flat glass composition with a high content of network formers like SiO2 and B2O3, optimized molar ratios, and minimized alkali and polyvalent metal ions, along with a controlled redox ratio of iron ions, to achieve broadband high transmittance and suitable thermal expansion, produced through processes like float or drawing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass composition is adjusted to optimize specific properties (e.g., chemical resistance, mechanical strength), then those specific properties are improved, but broadband transmittance across 200 nm to 1500 nm wavelength range deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chemical composition parameters of the glass, specifically limiting transition metals to ≤50 ppm total and Fe2+ to ≤10 ppm, while maintaining specific ranges for network formers (SiO2: 70-80 wt%, B2O3: 10-20 wt%) and network modifiers. This compositional parameter optimization enables simultaneous achievement of high chemical resistance and broadband optical transmittance without the trade-off that previously existed.
Data Source
AI summary
A flat glass is provided that exhibits high transmittance to electromagnetic radiation in a range of wavelengths from 200 nm to 1500 nm. The transmittance for the flat glass having a thickness of 1 mm is 20% or more at a wavelength of 254 nm, 82% or more at a wavelength of 300 nm, 90% or more at a wavelength of 350 nm, 92% or more at a wavelength of 546 nm, 92.5% or more at a wavelength of 1400 nm, 91.5% or more in a wavelength range from 380 nm to 780 nm, and 92.5% or more in a wavelength range from 780 nm to 1500 nm.