Tangential Gradient Thermal Spraying Coating for Complex Profile Workpieces
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Solution Overview
Problem
Homogeneous thermal spraying coatings fail to provide adequate erosion resistance for complex profile parts due to the wide range of impact angles, as they do not account for the varying brittle-ductile properties needed to match the changing impact angles, leading to uneven erosion rates and reduced service life.
Innovation Solution
A tangential gradient thermal spraying coating design method that determines the ductile-brittle ratio of the coating material based on the impact angle and service conditions, using a combination of theoretical calculations, software simulations, and erosion tests to create a coating structure that adapts to different surface positions, ensuring optimal erosion resistance across various impact angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If homogeneous coating material is used, then manufacturing process is simple, but erosion-resistant performance at various impact angles cannot be met
Solution Approach 1:
The patent applies local quality by creating a coating with spatially varying ductile-brittle ratio that matches the local impact angle characteristics. Different regions of the complex profile surface receive coating material with specifically tailored compositions - for example, regions experiencing high impact angles receive coatings with higher ductile content, while regions with low impact angles receive coatings with higher brittle content for maximum erosion resistance.
Solution Approach 2:
The patent implements parameter changes by systematically varying the ductile-brittle ratio parameter of the coating material across different surface positions. This involves changing the compositional parameters (material ratios) and structural parameters (coating thickness, porosity) of the coating to optimize erosion resistance for each specific impact angle regime encountered at different locations on the complex profile.
2Reliability
If coating material composition is varied to match impact angles, then erosion-resistant performance is improved, but coating structure complexity increases
Solution Approach 1:
The patent applies dynamics by implementing a gradient coating structure where the ductile-brittle ratio transitions continuously or in controlled steps across the surface, rather than using discrete abrupt changes. This dynamic variation in material composition allows the coating to adapt to the continuous variation in impact angles across the complex profile surface, optimizing performance while managing structural complexity through systematic gradient design.
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 method results in a more uniform erosion resistance and lower average erosion rate for complex profile parts, effectively prolonging their service life by matching the coating's performance to the changing impact angles, making it suitable for both new products and repair of damaged parts.
Implementation Method 1
thermal spraying technology is one of the important technologies for enhancing the erosion-resistant performance of the surface
Data Source
AI summary
A design method of tangential gradient thermal spraying coating for complex profile workpieces solves the erosion-resistant problem, and obtains a corresponding relation between the ductile-brittle ratio of the thermal sprayed coating and the impact angle change. The method includes: determining the complex profile part surface impact angle change rule according to the part operation environment conditions; selecting an erosion-resistant coating material according to the service condition requirement; obtaining the relation among the impact angle, ductile-brittle angle and erosion rate of the coating by an erosion test; determining the coating and the impact angle ductile-brittle corresponding relation curve; and performing spraying by using dual-channel powder feeding thermal spraying equipment the powder feeding quantity of which is adjustable in real time, based on a matching relation between the tangential gradient coating and the surface impact angle.