Induction-Compatible Sol-Gel Coating
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Solution Overview
Problem
Existing induction-compatible culinary articles face issues with heat conduction, hot spots, high manufacturing costs, worker safety concerns, and potential toxicity due to the use of toxic compounds in coatings, particularly when using non-inherently inductive materials like glass, aluminum, ceramic, or copper.
Innovation Solution
A sol-gel coating composition incorporating conductive fillers such as silver, copper, or aluminum is applied to make non-inherently inductive materials induction-compatible, providing excellent heat conduction, resistance to hydrolysis, and safety through a process that operates at lower temperatures, eliminating the need for high-temperature treatments and toxic compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inherently inductive supports (ferritic metal) are used, then induction compatibility is achieved, but heat conduction is poor causing hot spots and pyrolysis
Solution Approach 1:
The patent applies composite materials by combining a non-inductive support (aluminum, glass, ceramic, or copper) with a sol-gel coating containing conductive ferromagnetic particles. This composite structure provides both induction compatibility through the ferromagnetic coating and excellent heat conduction through the non-inductive support, eliminating hot spots and pyrolysis while maintaining induction compatibility.
2Reliability
If non-inductive supports are treated to make them inductive (plasma deposit), then induction compatibility is achieved, but manufacturing cost increases and surface roughness requires additional smoothing operations
Solution Approach 1:
The patent changes the process parameters by using sol-gel coating at lower temperatures (below 800°C) compared to traditional plasma deposition (200-800°C). The sol-gel process allows for direct application of the ferromagnetic coating without creating surface roughness that requires sanding or lacquering, thereby simplifying the manufacturing process and reducing costs while achieving induction compatibility.
Solution Approach 2:
The patent replaces the mechanical smoothing operations (sanding, lacquering) required after plasma deposition with a chemical sol-gel coating process. The sol-gel method forms a smooth, uniform coating directly during the coating application, eliminating the need for subsequent mechanical or chemical smoothing steps and reducing manufacturing complexity.
3Reliability
If plasma deposit process is used at high temperatures (200-800°C), then induction compatibility is achieved, but worker safety and production conditions are compromised
Solution Approach 1:
The patent changes the temperature parameter from high (200-800°C plasma deposition) to low (below 800°C sol-gel curing, typically 100-500°C). This parameter change significantly improves worker safety and production conditions by reducing thermal hazards, eliminating the need for specialized high-temperature equipment, and allowing for safer handling of coating materials while still achieving induction-compatible coatings.
4Reliability
If epoxy resin with bisphenol A is used in coating, then induction compatibility is achieved, but toxicity risk increases during thermal use cycles
Solution Approach 1:
The patent extracts and eliminates the toxic component (bisphenol A and epoxy resin) from the coating formulation. Instead, it uses a sol-gel-based coating with conductive ferromagnetic particles and safe binding agents. This extraction of harmful substances maintains induction compatibility while eliminating toxicity risks and health hazards during thermal use cycles, making the cookware safe for food contact.
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 sol-gel coating composition effectively makes any support induction-compatible, ensuring uniform heat distribution, safety, and environmental safety, while reducing manufacturing costs and eliminating the risk of toxic by-products, thus providing a safer and more efficient cooking experience.
Implementation Method 1
When a conductive material is placed over this inductor, a variable magnetic flux flows through it and becomes the seat of an electromotive force of induction. The so-called eddy currents induced in the conductive material cause it to heat by Joule effect.
Implementation Method 2
The so-called eddy currents induced in the conductive material cause it to heat by Joule effect. This effect is the thermal manifestation of the electrical resistance that occurs as the current passes through the conductive material.
Implementation Method 3
Thermal energy is transmitted to the food by thermal conduction and thus heats it.
Implementation Method 4
a sol-gel coating composition comprising conductive fillers, intended to make a culinary article induction-compatible
Data Source
AI summary
The present invention relates to a sol-gel coating composition comprising conductive fillers, intended to make a culinary article compatible with induction.