Ceramic coating with scratch resistance and thermal conduction properties
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Solution Overview
Problem
Sol-gel ceramic coatings on metal supports face challenges in achieving both mechanical resistance and thermal homogeneity, particularly in culinary applications where they are subjected to mechanical aggressions and thermal conduction is inefficient due to their insulating nature.
Innovation Solution
A ceramic coating is developed using particles with low bulk density and high thermal conductivity, such as diamond and cubic boron nitride, dispersed in a metal polyalkoxide matrix, which also includes silicone oil and structural fillers to enhance mechanical properties and hydrophobicity, applied in a thickness range of 2-100 μm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If standard metal fillers of micrometric size are used to improve thermal conduction, then thermal conductivity is improved, but density increases making suspension difficult and causing rapid decantation
Solution Approach 1:
The patent changes the key parameter of filler density from high (standard metals) to low (aerogels with density 0.003-0.5 g/cm³), while simultaneously maintaining or improving thermal conductivity through the unique nanostructured porous architecture of aerogels that enables phonon transport through solid frameworks while minimizing convective heat loss in pores
Solution Approach 2:
The patent creates a composite coating system combining aerogel particles dispersed in a ceramic matrix (such as alumina or silica), where the aerogel provides thermal conduction pathways and the ceramic matrix provides mechanical strength and chemical stability, achieving synergistic properties that neither material could provide alone
2Strength
If sol-gel ceramic coatings are applied to provide mechanical resistance, then scratch resistance is improved, but thermal conduction becomes insufficient due to insulating character
Solution Approach 1:
The patent develops a composite coating where ceramic particles (alumina, silica) embedded in a polymer or organic matrix provide mechanical hardness and scratch resistance, while the porous structure and potential metal oxide additives maintain thermal conduction capabilities, resolving the contradiction between mechanical protection and thermal management
3Strength
If thick coating layers are applied to ensure durability, then mechanical resistance is improved, but thermal homogeneity deteriorates due to increased insulation
Solution Approach 1:
The patent utilizes porous aerogel materials with controlled pore sizes and distributions that allow thermal energy to propagate through the coating more effectively than through solid dense materials of the same thickness, reducing thermal insulation while maintaining mechanical integrity through the interconnected porous network structure
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 coating achieves improved mechanical resistance and thermal homogeneity, reducing the risk of hot spots and enhancing energy efficiency during cooking, while maintaining a thin and durable layer.
Implementation Method 1
a synthesized coating by sol-gel process from a liquid phase precursor based solution, which converts into a solid through a set of chemical reactions (hydrolysis and condensation) at low temperature
Implementation Method 2
a synthesized coating by sol-gel process from a liquid phase precursor based solution, which converts into a solid through a set of chemical reactions (hydrolysis and condensation) at low temperature
Implementation Method 3
these particles being from a material having a thermal conductivity equal to or higher than 10 W·m−1·K−1
Data Source
AI summary
Provided is a ceramic coating intended to be applied on a metal support and having the form of at least a continuous film having a thickness between 2 and 100 μm, this coating comprising a matrix including at least a metal polyalkoxide and wherein are dispersed particles whereof the diameter ranges between 0.01 and 50 μm, said particles being from a material having a thermal conductivity equal to or higher than 10 W·m−1·K−1 and a bulk density of at the most 3.9 g/cm3. Also provided is an article, for example culinary, comprising such a coating and its method of manufacture.