Sol-Gel Coating with Oriented Anisotropic Particles to Reduce Chipping
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Solution Overview
Problem
Sol-gel coatings used in culinary articles and other surfaces suffer from chipping due to the orientation of anisotropic particles, which are prone to aligning horizontally or randomly, leading to weak stress areas.
Innovation Solution
Incorporating anisotropic particles, such as flakes or fibers, into the sol-gel coating and orienting them substantially perpendicular to the coating surface in sensitive areas using mechanical or physical means, like magnetic fields, to enhance resistance to chipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If anisotropic particles are incorporated in the sol-gel coating, then the hardness of the coating is improved, but the particles naturally orient horizontally or randomly which causes chipping in high stress areas
Solution Approach 1:
The patent applies different particle orientations in different areas of the coating. In sensitive areas (high stress zones), particles are oriented substantially perpendicular to the coating surface, while in other areas particles may have different orientations. This local differentiation resolves the contradiction by providing chipping resistance where needed while maintaining the overall hardness benefits of anisotropic particles throughout the coating.
Solution Approach 2:
Instead of allowing particles to naturally orient horizontally or randomly (conventional approach), the patent inverts this orientation by deliberately positioning particles substantially perpendicular to the coating surface in sensitive areas. This inversion of the natural orientation behavior resolves the chipping problem while preserving the hardness enhancement provided by the anisotropic particles.
2Strength
If flakes are incorporated in the sol-gel coating to improve hardness, then the coating becomes more prone to chipping in sensitive areas due to horizontal particle orientation
Solution Approach 1:
The patent specifically addresses sensitive areas by orienting flakes substantially perpendicular to the coating surface in those locations, while allowing different orientations in non-sensitive areas. This localized control of particle orientation eliminates chipping in high-stress zones while maintaining the hardness benefits of flake incorporation throughout the coating.
Solution Approach 2:
The patent preemptively orients particles perpendicular to the surface in sensitive areas before the chipping can occur during use. This preliminary structural arrangement counteracts the horizontal orientation that would naturally cause chipping, preventing the harmful effect before it manifests during normal operation of the culinary article.
3Reliability
If anisotropic particles are oriented perpendicular to the coating surface, then resistance to chipping is improved, but this requires complex orientation control methods
Solution Approach 1:
The patent employs magnetic particles that automatically self-orient perpendicular to the coating surface when exposed to a magnetic field during the sol-gel process. This self-service orientation mechanism eliminates the need for complex mechanical orientation control devices, as the particles themselves perform the orientation function in response to the magnetic field, simplifying the overall system while achieving the desired perpendicular orientation for chipping resistance.
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
This orientation significantly improves the mechanical reinforcement of the sol-gel layer, reducing crack propagation and enhancing the coating's resistance to chipping by ensuring that more than 66% of particles are inclined between 20° and 90° relative to the film plane.
Implementation Method 1
In the case of particles capable of being oriented by physical means (for example, electrical or magnetic), the substantially perpendicular orientation of the anisotropic particles with respect to the coating layer may result from a position that is simultaneous or subsequent to the coating application, such as for example the orientation of particles magnetisable under the effect of a magnetic field
Data Source
AI summary
Provided is a vitreous coating comprising at least one layer embodied in the form of a continuous film of sol-gel material comprising a matrix formed from at least one metal polyalkoxylate and wherein anisotropically-shaped particles are dispersed, said layer comprising at least one area wherein the particles are particles predominantly inclined by an angle (α) of between 20° and 90° relative to the median plane of the film. The subject matter of the present invention also comprises a method of manufacturing such a coating, and a culinary article one of the surfaces of which is coated with such a coating.