Non-stick coating comprising at least one functional decorative layer and item provided with such a coating
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Solution Overview
Problem
Existing heat indicators on cooking tools are difficult for users to discern, especially at first glance, due to similar chromatic values at room temperature and limited temperature change visibility, leading to ineffective temperature control and potential overheating.
Innovation Solution
A non-stick coating with a pigment composition that exhibits a reversible change in optical and colorimetric properties, specifically using compounds with a garnet structure such as Y(3-x)MxFe(5-y)QyO12, which changes color from green to red between 0°C and 400°C, providing clear temperature indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermochromic pigments with similar chromatic values are used in contiguous areas, then temperature indication function is achieved, but visual discernibility deteriorates
Solution Approach 1:
The patent applies color changes principle by using thermochromic pigments that undergo distinct color transformations at different temperature ranges. The first thermochromic pigment changes color between 20°C to 80°C while the second changes between 100°C to 180°C, creating visually distinguishable temperature zones that solve the discernibility problem while maintaining temperature indication functionality
Solution Approach 2:
The patent implements local quality by assigning different thermochromic pigment compositions to different spatial zones of the coating. Each zone contains pigments optimized for specific temperature ranges, allowing local temperature detection with high visual contrast while maintaining overall functional reliability
2Reliability
If heat-sensitive and heat-stable pigments are combined, then temperature change detection is enabled, but clear temperature discernibility deteriorates
Solution Approach 1:
The patent uses color changes principle by selecting thermochromic pigments with distinct color transition characteristics. The first pigment transitions in the 20-80°C range while the second transitions in the 100-180°C range, creating clearly distinguishable visual signals that enable precise temperature measurement without requiring complex reference systems
3Difficulty of detecting and measuring
If CuMoW oxides are used for colored heat indicator, then distinct color change is achieved, but cyclability deteriorates
Solution Approach 1:
The patent applies composite materials principle by combining multiple thermochromic pigments with different transition characteristics into a single coating system. This composite approach maintains distinct color changes while improving cyclability, as each pigment layer can independently undergo temperature cycles without degrading the overall indicator performance
Solution Approach 2:
The patent uses parameter changes principle by selecting pigments with specific transition temperature ranges (20-80°C and 100-180°C) that are optimized for repeated cycling. These parameter selections ensure both distinct visual changes and enhanced durability over multiple thermal cycles, solving the cyclability problem
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 allows for distinct and reversible color changes, enhancing user visibility of temperature changes, improving cooking control, and extending the lifespan of cooking tools by preventing overheating.
Implementation Method 1
a pigment composition which displays a reversible change in optical and/or colorimetric properties when the coating is subjected, in part or in whole, to a temperature change
Data Source
AI summary
Provided is a non-stick coating including at least one functional decorative layer, including a pigment composition having a reversible variation of optical and/or colorimetric properties when the coating is subjected to a temperature variation between a cold temperature of 0° C. to 40° C. and a hot temperature of 80° C. to 400° C. The pigment composition includes at least one compound of formula Y(3-x)MxFe(5-y)QyO12 in the form of particles, in which M is selected from the lanthanides, alkaline metals, alkaline-earth metals and metalloids with a degree of oxidation (DO) +3; Q is selected from the group made up of the lanthanides, non-metals with degree of oxidation +4, metals with DO +3 or +4, transition metals with DO +2 or +4, alkaline-earth metals and alkaline metals; and wherein x is between 0 and 0.3 and y is between 0 and 3.