Compressor Blade Coating Structure for Turbulence and Erosion
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Solution Overview
Problem
Current coatings for compressor blades fail to effectively introduce surface structuring, which is necessary for protection against oxidation and erosion, due to complexity in implementation.
Innovation Solution
A layer system comprising a PVD layer and hard coatings, such as aluminum-chromium and aluminum-chromium oxide, with structured triangular features or lotus-flower patterns, applied using laser beam interference processing to achieve a sharkskin or dewetting effect, reducing turbulence and erosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional coatings are applied to compressor blades, then the coating process is simple, but the surface structuring capability is insufficient for effective oxidation and erosion protection
Solution Approach 1:
The patent combines multiple coating techniques (PVD, CVD, plasma spraying, electrostatic spraying) into a single integrated coating system that can apply both protective coatings and surface structuring in one process, eliminating the need for separate structuring steps and reducing overall process complexity
Solution Approach 2:
The patent introduces intermediate layers (such as aluminum-chromium oxide layers) that serve as both protective barriers and substrates for surface structuring, allowing the structuring to be formed on the intermediate layer rather than directly on the substrate, thereby simplifying the overall process
2Reliability
If surface structuring is introduced to protect against oxidation and erosion, then protection effectiveness is improved, but the implementation complexity increases
Solution Approach 1:
The patent applies surface structuring and protective coatings during the initial manufacturing process rather than as a post-processing step, so that the blade receives both protection and functional surface properties before entering service, eliminating the need for separate subsequent treatments
Solution Approach 2:
The coating system is designed to perform multiple functions simultaneously: providing oxidation protection, erosion protection, and surface structuring for flow control, all through a single integrated application process rather than requiring separate treatments for each function
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 structured surface coatings enhance compressor blade efficiency by reducing turbulence and erosion, while providing protection against oxidation and erosion through improved surface properties.
Implementation Method 1
A layer system comprising a PVD layer and hard coatings, such as aluminum-chromium and aluminum-chromium oxide
Implementation Method 2
applied using laser beam interference processing to achieve a sharkskin or dewetting effect
Data Source
AI summary
A layer system having a metallic substrate, in particular made of a >=9% by weight chromium steel, in particular with roughness of the substrate <=2 μm and optionally an intervening chromium layer directly on the substrate, in particular made of Cr/CrN, an underlayer or middle layer of AlCr, and an outer layer, in particular outermost layer, of AlCrO, where the AlCr and AlCrO layers in particular are PVD coatings wherein a shark skin effect is achieved with a simple geometric arrangement, and can be used particularly for compressor blades.