Split Coating Mask for Gas Turbine Platform
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Solution Overview
Problem
Existing coating methods for gas turbine engine components often result in overspray on non-coated edges due to manufacturing tolerances, leading to chipping of the thermal barrier coating when the mask is removed, which compromises the component's protection and assembly tolerances.
Innovation Solution
A dual-mask assembly with L-shaped skirts that slidably abut and overlap the component edges, eliminating gaps and using a clip and post mechanism to securely fit and disassemble without chipping the coating, ensuring precise coverage and easy removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single rectilinear mask is used to shield the airfoil, then the masking process is simple, but gaps may form due to component tolerances allowing overspray to reach non-coated edges
Solution Approach 1:
The single mask is divided into two separate masks: a first mask with a first skirt and a second mask with a second skirt. Each mask can be independently positioned and secured to the component, allowing them to work together in eliminating gaps that would occur with a single mask design.
2Ease of operation
If the mask is manually slid into position, then the masking process is simple, but gaps may form between the mask and component edges due to tolerances
Solution Approach 1:
The masks are designed with skirts that can slide along the component edges and be secured in position using fasteners. This dynamic positioning allows the masks to adapt to slight variations in component dimensions while maintaining a tight seal to prevent overspray.
3Ease of operation
If the mask is removed by tapping the component, then the mask can be released from the mask assembly, but the thermal barrier coating may be chipped and damaged
Solution Approach 1:
The mask assembly is segmented into two separate masks that can be independently removed. This allows the coating to be released from each mask surface separately, reducing the force required and minimizing the risk of chipping the thermal barrier coating compared to removing a single large mask assembly.
4Device complexity
If a single mask is used to shield the airfoil, then the coating process is straightforward, but overspray may reach non-coated edges and glue the mask to the component
Solution Approach 1:
The single mask is divided into two separate masks with respective skirts. This segmentation allows each mask to be positioned closer to the component edges, reducing the likelihood that overspray can reach non-coated edges and create adhesive bonds that would trap the mask assembly.
Data Source
AI summary
A mask assembly for a gas turbine engine component includes a second mask that at least partially overlaps a first mask to fit a platform of a gas turbine engine component.