Glass article
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Solution Overview
Problem
Li2O—Al2O3—SiO2-based crystallized glass used for cooker top plates is impaired by color tone due to TiO2 and Fe2O3, affecting the appearance.
Innovation Solution
A glass article with a Li2O—Al2O3—SiO2-based crystallized glass sheet having specific composition ranges, including SiO2 from 40 to 90%, Al2O3 from 5 to 30%, Li2O from 1 to 10%, and controlled amounts of TiO2, SnO2, ZrO2, MgO, P2O5, and Sb2O3+As2O3, ensuring a colorless and transparent appearance and minimal impact on the colored layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Li2O—Al2O3—SiO2-based crystallized glass containing TiO2 and Fe2O3 is used for cooker top plates, then the glass provides necessary thermal properties and structural integrity, but the color tone of the glass and colored layer is impaired, affecting appearance
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chemical composition parameters of the glass, specifically limiting TiO2 to 0.01-2.0 wt% and Fe2O3 to 0.01-1.0 wt%, while optimizing SiO2 (30-70 wt%), Al2O3 (10-30 wt%), and Li2O (1-10 wt%). This compositional parameter optimization reduces coloration while preserving thermal properties, directly resolving the contradiction between reliability and appearance.
Solution Approach 2:
The patent applies local quality by creating a multi-layer structure where the glass substrate and colored layer have distinct functional properties. The glass substrate is optimized for thermal resistance with controlled composition, while the colored layer applied on its surface provides aesthetic function. This separation allows each layer to optimize its local quality without compromising the other, resolving the appearance contradiction.
2Ease of manufacture
If a colored layer is formed on the back surface of the glass substrate to improve design and conceal internal structures, then the aesthetic function is enhanced, but the color tone of the colored layer is impaired by the underlying glass coloration
Solution Approach 1:
The patent applies the extraction principle by removing the coloration problem from the glass substrate through compositional optimization (limiting TiO2 and Fe2O3). By extracting the coloration issue from the substrate, the colored layer can perform its aesthetic function without being compromised by underlying coloration, resolving the contradiction between aesthetic enhancement and color tone preservation.
3Reliability
If the glass composition includes higher amounts of TiO2 and Fe2O3 to maintain structural integrity and thermal resistance, then the reliability is improved, but the lightness L* decreases and chromaticity increases, impairing transparency
Solution Approach 1:
The patent applies parameter changes by optimizing the compositional parameters within specific ranges: SiO2 (30-70 wt%), Al2O3 (10-30 wt%), Li2O (1-10 wt%), TiO2 (0.01-2.0 wt%), and Fe2O3 (0.01-1.0 wt%). This parameter optimization achieves the desired balance between structural integrity (maintained through Al2O3 and SiO2) and transparency (improved by limiting TiO2 and Fe2O3), resolving the contradiction between reliability and illumination properties.
Data Source
AI summary
To provide a glass article suitable for a top plate for a cooker, in which a color tone of a colored layer is not impaired. A glass article is characterized by including a Li2O—Al2O3—SiO2-based crystallized glass sheet having lightness L* of 70 or greater, chromaticity a* of within ±5, and chromaticity b* of within ±5 at a thickness of 3 mm, and a colored layer formed on a back surface of the glass sheet.