Metal Coating for Microstructured Drag Reduction
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Solution Overview
Problem
Microstructured surfaces used for reducing air drag are prone to damage and deformation under mechanical, thermal, and chemical loading, leading to a decrease in drag reduction and potentially increased frictional drag, making them impractical for functional applications.
Innovation Solution
A coated object comprising a metal layer, a coupling layer, and an inner polymer layer, where the coupling layer connects the metal and polymer layers, and the polymer layer is applied with a microstructure, using a plasma treatment to ensure stability, adhesion, and resistance to mechanical and chemical influences, while maintaining the surface topology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If polymer lacquer is applied to microstructured surfaces to reduce air drag, then drag reduction is improved by 8-10%, but the surface becomes soft and easily damaged under mechanical loading
Solution Approach 1:
The patent applies a multi-layer composite coating system consisting of a polymer lacquer layer containing microstructured ribs, overlaid with a hard metal layer (such as chromium, cobalt, or tungsten). This composite structure combines the drag-reducing properties of the polymer microstructure with the mechanical hardness and damage resistance of the metal layer, resolving the contradiction between energy efficiency and surface strength.
2Loss of energy
If polymer-based riblet structures are used for drag reduction, then frictional drag decreases by 8-10%, but the structure deforms and separates under mechanical stress
Solution Approach 1:
The patent creates a composite coating where a polymer lacquer layer with imprinted riblet microstructure is overlaid with a hard metal layer. The metal layer provides structural stability and resistance to deformation and separation under mechanical stress, while the underlying polymer layer with its microstructured ribs maintains the drag-reducing functionality. This composite approach ensures both reliability and energy efficiency.
Solution Approach 2:
The patent uses a thin polymer lacquer layer as a flexible base that can accommodate the microstructured riblet pattern while being protected by the harder metal overlay. The thin film structure allows the microstructure to be imprinted and cured effectively, providing the necessary flexibility for the drag-reducing geometry while the metal layer provides the structural protection needed for reliability.
3Duration of action of moving object
If continuous mechanical loading is applied to polymer riblet structures, then drag reduction effect is maintained, but frictional drag increases due to damage and deformation
Solution Approach 1:
The patent employs a composite coating system where the hard metal layer protects the polymer riblet structure from mechanical damage during continuous operation. This protection prevents deformation and separation of the microstructure, ensuring that the drag-reducing functionality is maintained over time and preventing the increase in frictional drag that would otherwise occur with sustained mechanical loading.
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 high stability, abrasion resistance, and chemical resistance, allowing for the use of microstructured surfaces with 'pointed' projections, reducing maintenance costs and extending the service life of components by maintaining drag reduction and preventing damage from mechanical loads.
Implementation Method 1
using a plasma treatment to ensure stability, adhesion, and resistance to mechanical and chemical influences
Implementation Method 2
The sum of the diameters of layers (a) and (b) being between 10 nm and 500 nm
Data Source
AI summary
The present invention relates to a coated object comprising at least(a) a metal layer,(b) a coupling layer,(c) an inner polymer layer, and(d) a substrate surface,wherein the coupling layer (b) is arranged between layers (a) and (c) and connects said layers, the polymer layer (c) being arranged on the substrate surface (d) and the sum of the diameters of layers (a) and (b) being between 5 nm and 500 nm. The invention also relates to methods and devices for producing the object.