Compressor Blade Masking for Selective Coating Coverage
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Solution Overview
Problem
Existing gas turbine engine components, particularly compressor blades, face challenges in selectively applying coatings to withstand the hostile hot gas path environment without inadvertently coating critical areas that could add unnecessary weight or interfere with coupling, often requiring laborious removal or scrapping of improperly applied coatings.
Innovation Solution
A multi-component masking system comprising a first and second piece, securely fastened together, is used to encapsulate non-coating areas of the blade, such as the root and platform edges, allowing only the airfoil and top edge to be coated, thereby preventing coating on these critical areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating is applied to the entire blade to protect against the hot gas path environment, then the protective coating coverage is improved, but the blade root and platform edges are inadvertently coated which adds unnecessary weight and interferes with coupling
Solution Approach 1:
The masking system is divided into multiple components including a first piece with a recessed area, a second piece, and a third piece. These segmented components work together to precisely mask only the blade root and platform edges, allowing the coating to be applied to the airfoil and other critical surfaces without coating the masked areas, thereby avoiding unnecessary weight addition while maintaining comprehensive protection where needed.
Solution Approach 2:
The masking system applies the masking principle locally to specific areas that require protection from coating (blade root and platform edges). The recessed area of the first piece and the configuration of subsequent pieces create localized masking zones that precisely target only the areas where coating would be harmful, leaving the rest of the blade surface exposed for proper coating application.
2Reliability
If a coating is applied to the entire blade, then the protective coating coverage is improved, but the coating on critical areas requires laborious removal or scrapping
Solution Approach 1:
The masking system is assembled and positioned on the blade before the coating application process begins. The multi-piece masking structure is secured to the blade, creating protective barriers on the blade root and platform edges in advance. This preliminary masking action prevents coating contamination before it occurs, eliminating the need for subsequent laborious removal processes and allowing the coating to be applied efficiently to the exposed surfaces.
3Device complexity
If a simple masking approach is used, then the device complexity is reduced, but the masking precision and component encapsulation are insufficient
Solution Approach 1:
The masking system employs multiple segmented pieces rather than a single complex mask. The first piece with its recessed area, the second piece, and the third piece each perform specific masking functions. This segmentation allows for precise encapsulation of the blade root and platform edges while keeping each individual masking component relatively simple in structure, thereby achieving high manufacturing precision without excessive overall complexity.
Solution Approach 2:
The masking pieces act as intermediary elements between the coating application process and the blade surfaces that require protection. These intermediary masking components precisely control where the coating is applied by physically blocking access to the blade root and platform edges, thereby achieving the desired coating application precision through the mediating function of the masking system.
Data Source
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Figure 2
Figure 3A
AI summary
A masking system for selectively masking a component is provided. The component has a projection. The masking system includes a first piece having a recessed area. The recessed area is configured to house the projection. The masking system has a second piece securable to the first piece. A first portion of the component is masked and a second portion of the component is exposed when the projection is housed within the recessed area and the first piece is secured to the second piece.