Compressor Blade Coating With Sharkskin Texture for Erosion Control
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Solution Overview
Problem
Compressor blade coatings fail to effectively protect against oxidation and erosion while also improving surface properties, as they lack the necessary surface structuring that could be introduced at a high cost.
Innovation Solution
A layer system with a sharkskin-like texture created by a PVD layer and/or hard coating, featuring a chromium nitride intermediate layer, aluminum chromium-based base layer, and aluminum chromium oxide outer coating, applied using Laser Beam Interference Processing to reduce turbulence and erosion, and transitioning to a lotus flower effect in the rear region for dewetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating is applied to improve surface properties, then protection against oxidation and erosion is improved, but surface structuring capability deteriorates
Solution Approach 1:
The patent applies a composite coating system consisting of multiple layers: a base layer (e.g., aluminum chromium), an intermediate layer (e.g., chromium nitride), and an outer layer (e.g., aluminum chromium oxide). This multi-layer composite structure provides both protective functions (oxidation and erosion resistance) and enables surface structuring capabilities that single-layer coatings cannot achieve.
Solution Approach 2:
The patent introduces surface structuring (sharkskin effect) only in specific regions where it is most beneficial for reducing turbulence, rather than applying it uniformly across the entire blade surface. This localized approach optimizes performance while controlling manufacturing complexity.
2Productivity
If surface structuring is introduced to reduce turbulence, then compressor efficiency is improved, but manufacturing cost increases
Solution Approach 1:
The patent incorporates surface structuring directly into the coating application process itself, rather than requiring separate post-manufacturing steps. The coating layers are deposited with built-in microstructures that create the sharkskin effect, combining protection and flow optimization in a single manufacturing operation.
Solution Approach 2:
The patent merges multiple functions into the coating system: protection against oxidation, protection against erosion, and turbulence reduction through surface structuring. By combining these functions into a single integrated coating solution, the total manufacturing cost is reduced compared to applying separate treatments for each function.
3Object-generated harmful factors
If a PVD layer with sharkskin effect is applied, then flow resistance is reduced, but coating complexity increases
Solution Approach 1:
The patent divides the coating system into distinct functional layers: a base layer for adhesion and corrosion resistance, an intermediate layer for enhanced protection, and an outer layer with embedded microstructures for flow resistance reduction. This segmentation allows each layer to be optimized independently while maintaining overall system simplicity.
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 significantly reduces flow resistance and erosion by creating a structured surface that mimics shark skin and lotus flower effects, enhancing compressor blade efficiency and protection against oxidation and erosion.
Implementation Method 1
a PVD layer and/or a corresponding hard coating
Implementation Method 2
using Laser Beam Interference Processing (LBIP)
Implementation Method 3
protection against oxidation and erosion
Data Source
Figure 1~2
Figure 3~4
AI summary
A shark skin effect is achieved with a simple geometric arrangement, and can be used particularly for compressor blades.