Dyed Glass-Ceramic Cooktop Composition for Colored LED Visibility
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Solution Overview
Problem
Existing glass-ceramic cook tops or hobs with high-quartz mixed crystals struggle to achieve optimal light transmission and display capabilities, particularly in the visible and infrared ranges, while maintaining safety and environmental standards, due to limitations in refining agents and coloration processes.
Innovation Solution
A glass-ceramic cook top or hob with a composition that includes V2O5 as the primary color oxide, combined with specific redox adjustments and refining agents like SnO2, CeO2, and halide compounds, to achieve light transmission values of 0.8 to 2.5% in the visible range and 45-85% in the infrared range, while avoiding the use of arsenic and antimony oxides for environmental safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If arsenic and antimony oxides are used as refining agents, then excellent blister qualities are achieved, but safety and environmental protection are compromised
Solution Approach 1:
The patent removes arsenic and antimony oxides from the refining agent composition and replaces them with tin oxide (SnO2) and halide compounds. This extraction of harmful substances while maintaining the refining function resolves the contradiction between achieving excellent blister quality and ensuring safety/environmental protection.
Solution Approach 2:
The patent employs tin oxide and halide compounds as alternative refining agents that can be effectively removed or decomposed during the melting process, unlike persistent harmful substances. These alternative agents provide the necessary refining action without long-term environmental or safety concerns.
2Manufacturing precision
If halide compounds are added as refining agents with SnO2, then perfect blister qualities are achieved at conventional melting temperatures, but toxic compounds such as HF are produced
Solution Approach 1:
The patent acknowledges that halide compounds can produce toxic HF during refining, but converts this harmful effect into a beneficial one by controlling the refining process to achieve perfect blister qualities. The harmful HF production is managed through controlled addition and processing conditions, transforming a potential hazard into an acceptable trade-off for superior product quality.
3Illumination intensity
If V2O5 is used as the main coloring agent, then good indication capability is achieved, but transmission in the wavelength range beginning at 450 nm is insufficient
Solution Approach 1:
The patent modifies the local optical properties of the glass-ceramic by adjusting the V2O5 concentration and combining it with other colorants like Fe2O3 and CoO. This creates a localized optimization where the coloring provides sufficient display capability in certain wavelength ranges while maintaining adequate transmission in others, particularly in the blue-green spectrum.
Solution Approach 2:
The patent uses a composite coloring system combining V2O5 with Fe2O3, CoO, and other metal oxides. This composite approach allows the different colorants to work synergistically, with V2O5 providing the primary indication capability while Fe2O3 and CoO modulate the transmission characteristics, particularly improving transmission in the 450 nm and above wavelength range.
4Illumination intensity
If light transmission is increased for better display capability, then colored LED visibility is improved, but the black aesthetic appearance is compromised
Solution Approach 1:
The patent optimizes the light transmission parameters by precisely controlling the concentration of coloring agents (V2O5, Fe2O3, CoO) and the glass-ceramic composition. This parameter optimization achieves a balance where transmission is sufficient for colored LED visibility while maintaining the desired black aesthetic appearance, creating an optimal trade-off between functionality and appearance.
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 solution provides improved display capabilities for various colored LEDs, including blue and green, while ensuring high infrared transmission for faster cooking and preventing overheating, while maintaining a black aesthetic appearance and safety standards.
Implementation Method 1
V2O5 as the primary color oxide, combined with specific redox adjustments and refining agents like SnO2, CeO2, and halide compounds, to achieve light transmission values of 0.8 to 2.5% in the visible range
Implementation Method 2
SnO2, preferably halide compounds are used as additional refining agents. These refining agents are compatible with the required glass-ceramic properties and lead to excellent blister qualities of the molten mass
Implementation Method 3
achieve light transmission values of 0.8 to 2.5% in the visible range and 45-85% in the infrared range, while avoiding the use of arsenic and antimony oxides for environmental safety
Implementation Method 4
combined with specific redox adjustments and refining agents like SnO2, CeO2, and halide compounds
Data Source
AI summary
Transparent, dyed cook top or hob with improved color display capability, consisting of a glass ceramic with high quartz mixed crystals as predominant crystal phase, whereby the glass-ceramic contains none of the chemical refining agents arsenic oxide and/or antimony, with transmission values of greater than 0.1% in the range of the visible light within the entire wavelength range greater than 450 nm, a light transmission in the visible of 0.8-2.5% and a transmission in the infrared at 1600 nm of 45-85%.