Flexible Ceramic Tape Protective Layer for CMC Components
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Solution Overview
Problem
Ceramic matrix composites (CMCs) lack sufficient surface protection, leading to degradation and failure in high-temperature environments due to environmental ingress and damage without a suitable protective layer.
Innovation Solution
A method of preparing a CMC component with a protective ceramic layer by adhering flexible ceramic tape comprising SiC powder and ceramic additives to a ceramic fiber preform, followed by heating to volatilize the organic binder and subsequent infiltration with a molten material, forming a porous ceramic layer that provides environmental protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If ceramic matrix composites are used in high-temperature environments, then temperature capability and low weight are improved, but surface protection and resistance to environmental ingress are insufficient
Solution Approach 1:
The patent applies composite materials by combining ceramic fibers with a protective ceramic matrix and surface coating. The CMC structure integrates discontinuous ceramic fibers embedded in a ceramic matrix, with an additional protective ceramic layer applied to the surface. This composite structure maintains the high-temperature capability of ceramics while adding environmental protection through the protective matrix and surface coating, resolving the contradiction between temperature capability and surface protection.
2Reliability
If a protective ceramic layer is applied to CMC components, then environmental resistance and durability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by forming the protective ceramic matrix and surface coating during the same manufacturing process as the CMC component itself. The protective layer is integrated into the fabrication process through slurry infiltration and drying, rather than being applied as a separate post-processing step. This approach embeds the protective function into the base structure during manufacturing, reducing overall process complexity while ensuring uniform protection.
3Ease of manufacture
If flexible ceramic tape with organic binder is used to form protective layer, then ease of application and compositional modification are improved, but additional heating step to volatilize binder is required
Solution Approach 1:
The patent merges the protective layer formation process with the existing CMC manufacturing steps. The flexible ceramic tape impregnated with organic binder is applied to the CMC component, and the subsequent heating process serves dual purposes: volatilizing the organic binder to create porosity and preparing the structure for slurry infiltration. This consolidation of functions reduces the number of separate process steps while maintaining ease of application through the flexible tape format.
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 effectively forms a protective ceramic layer that enhances the durability and resistance of CMC components to environmental exposure and machining, maintaining mechanical integrity and allowing for simplified compositional modification while providing improved water vapor resistance.
Implementation Method 1
the at least one flexible ceramic tape is heated to a temperature sufficient to volatilize the organic binder phase, thereby forming a porous ceramic layer on at least a portion of the ceramic fiber preform
Implementation Method 2
the ceramic fiber preform and the porous ceramic layer are infiltrated with a molten material, thereby forming a CMC component including, on at least a portion thereof, a protective ceramic layer
Data Source
AI summary
A method of preparing a ceramic matrix composite (CMC) component that includes a protective ceramic layer comprises adhering at least one flexible ceramic tape to a ceramic fiber preform, where the at least one flexible ceramic tape comprises ceramic particles dispersed in an organic binder phase. After the adhering, the at least one flexible ceramic tape is heated to a temperature sufficient to volatilize the organic binder phase, thereby forming a porous ceramic layer on at least a portion of the ceramic fiber preform. After the heating and volatilizing, the ceramic fiber preform and the porous ceramic layer are infiltrated with a molten material, thereby forming a CMC component including, on at least a portion thereof, a protective ceramic layer.