Turbine CMC Interface Shield for Thermal Binding
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Solution Overview
Problem
Hot gas path components in gas turbines, particularly ceramic matrix composite (CMC) components, are vulnerable to damage from high air and acoustic loads, leading to potential thermal binding and reduced lifespan when adjacent to metallic components.
Innovation Solution
A turbine component assembly featuring a CMC component adjacent to the hot gas path and a metallic component distal to it, with an interface shield directly contacting the metallic component to provide enhanced wear resistance and damping, reducing thermal binding and maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If CMC components are used in hot gas path, then temperature resistance is improved, but susceptibility to air loads and acoustic loads damage increases
Solution Approach 1:
A metallic coating layer is applied to the surface of CMC components to serve as an intermediary between the CMC substrate and the harsh operating environment. This coating layer protects the CMC from direct exposure to air loads and acoustic loads while allowing the CMC to benefit from its high temperature resistance.
Solution Approach 2:
The invention creates a composite structure by combining CMC material with a metallic coating layer. This composite approach leverages the high temperature resistance of CMC while the metallic coating provides enhanced durability against air loads and acoustic loads, resolving the contradiction between temperature resistance and reliability.
2Reliability
If inner shroud is loaded to dampen air loads and acoustic loads, then vibration damage is reduced, but thermal binding between CMC and metal components increases
Solution Approach 1:
The metallic coating is applied selectively to specific regions of the CMC component where contact with metallic components occurs. This localized coating approach provides the necessary damping and protection at contact interfaces without requiring the entire CMC component to be heavily loaded, thereby reducing thermal binding issues.
Solution Approach 2:
The metallic coating acts as an intermediary layer between the CMC component and adjacent metallic components, preventing direct thermal contact and binding while still providing the necessary mechanical damping against air loads and acoustic loads.
3Adaptability or versatility
If CMC components are adjacent to metallic components, then design flexibility is improved, but thermal binding and component damage increase
Solution Approach 1:
The metallic coating serves as a protective intermediary that enables the CMC component to safely interface with metallic components. This allows designers to combine different material types for optimal performance while the coating prevents harmful thermal binding and damage at the interfaces.
Solution Approach 2:
The invention changes the surface properties of the CMC component through coating application, modifying parameters such as thermal conductivity, surface hardness, and thermal expansion characteristics at the interface regions to prevent binding while maintaining design flexibility.
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 interface shield improves mechanical properties, extends component life, decreases maintenance requirements, and eliminates spring coil failure, while reducing thermal binding and wear, thereby enhancing the durability and performance of turbine components.
Implementation Method 1
loading an inner shroud to dampen air loads and acoustic loads
Data Source
AI summary
A turbine component assembly is disclosed, including a first component, a second component, and an interface shield. The first component is arranged to be disposed adjacent to a hot gas path, and includes a ceramic matrix composite composition. The second component is adjacent to the first component and arranged to be disposed distal from the hot gas path across the first component. The interface shield is disposed on a contact region of the first component, and directly contacts the second component.