Ceramic Matrix Composite Repair via Reactive Bonding
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Solution Overview
Problem
Current methods for repairing ceramic matrix composite components in gas turbine engines are limited by high costs and time, and existing technologies do not effectively address the need for efficient repair of non-conformities such as cracks, delamination, and material degradation in high-temperature environments.
Innovation Solution
A method involving mechanical interlocking and reactive processing, where a repair patch is integrated with the component through an equilibrium reaction using alternating layers of constituents like Ti, Zr, Hf, and Si, and applying energy to facilitate a self-propagating reaction, utilizing ultrasonic machining for material removal and creating a bond structure with carbides, borides, and intermetallics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional repair methods are used for ceramic matrix composite components, then the repair can be performed with existing technology, but the repair cost is high and the time required is excessive
Solution Approach 1:
The patent changes the chemical state of the bonding interface by applying alternating layers of reactive constituents (Ti, Zr, Hf, Si) that undergo equilibrium reactions at elevated temperatures to form strong intermetallic bonds, carbides, and borides. This chemical transformation enables rapid repair while achieving bond strengths comparable to or exceeding the base material
Solution Approach 2:
The patent prepares the repair surface in advance by removing the non-conforming portion and creating a mechanically interlocking geometry through ultrasonic machining. The alternating layers of reactive constituents are applied beforehand to the repair patch and component surface, so that when assembled, the equilibrium reaction can proceed immediately upon heating, significantly reducing total repair time
2Strength
If strong bonding is achieved through reactive processing, then structural integrity is enhanced, but the process complexity increases
Solution Approach 1:
The bonding interface is segmented into alternating layers of different reactive constituents (Ti, Zr, Hf, Si) with thicknesses of 0.5-5 micrometers each. This segmentation allows each layer to participate in specific equilibrium reactions, creating a gradient of intermediate phases that enhance bond strength while controlling the complexity of the reaction zones
Solution Approach 2:
The alternating layers of reactive constituents act as intermediaries between the ceramic matrix composite repair patch and the base component. These layers undergo equilibrium reactions to form intermediate compounds (carbides, borides, intermetallics) that mediate the bonding process, creating strong chemical bonds while managing the complexity through controlled reaction pathways
3Reliability
If mechanical interlocking is combined with reactive bonding, then repair reliability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent merges two bonding mechanisms—mechanical interlocking through ultrasonic machining of the repair geometry and chemical bonding through equilibrium reactions of alternating reactive constituent layers. This combination creates redundant bonding pathways, where mechanical interlocking provides immediate structural support while chemical bonds develop during heating, thereby improving reliability without requiring extreme precision in a single mechanism
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
This approach enables efficient and cost-effective repair of ceramic matrix composite components by forming a strong bond, enhancing structural integrity and reducing production cycles, while accommodating complex geometries and high-temperature operations.
Implementation Method 1
removing a repair volume from the component using ultrasonic machining
Implementation Method 2
applying an equilibrium reaction to form a bond structure between the repair patch and the component
Implementation Method 3
applying energy to facilitate a self-propagating reaction
Data Source
Figure 1
Figure 2
Figure 3a~4b
AI summary
A method for modifying a ceramic matrix component is disclosed including identifying a non-conforming region of a composite component capable of operating in a gas turbine engine; removing at least a portion of the non¬ conforming region to create an exposed surface of the composite component; preparing a preform in response to the removing at least a portion of the non¬ conforming region; applying a reactive constituent surface region to at least one of the exposed surface of the composite component and the preform, the reactive constituent surface region being capable of producing a non-equilibrium condition; positioning the preform to provide a contact region between the exposed surface of the composite component and the preform proximate the reactive constituent surface region; and reacting the reactive constituent surface region in an equilibrium reaction at the contact region to form a bond structure between the exposed surface of the composite component and the preform.