Particle Inserts for CMC Densification
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Solution Overview
Problem
Traditional fiber-based fillers in ceramic matrix composite (CMC) components can block densification during the chemical vapor infiltration (CVI) process, leading to residual porosity, poor thermal properties, and early failure in gas turbine engine components.
Innovation Solution
Replaced traditional fiber-based fillers with ceramic particles packed into 'noodle' spaces to create a three-dimensional network of pores, allowing for densification through CVI or liquid infiltration processes, improving interlaminar and thermal properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional fiber-based fillers are used to fill T-joint fillets and spaces between plies, then the component structure is completed, but densification is blocked during CVI process leading to residual porosity
Solution Approach 1:
The invention changes the material parameter from fiber-based fillers to ceramic particles with specific size distributions (D10-D90 ratio of 1.2-2.0). This parameter change enables the fill material to densify properly during CVI while maintaining structural integrity, eliminating residual porosity without blocking the densification process.
Solution Approach 2:
The invention uses composite ceramic particles that combine multiple ceramic materials (e.g., SiC, Si3N4, Al2O3) in specific ratios. This composite approach allows the fill material to match the thermal and mechanical properties of the surrounding CMC while enabling proper densification, resolving the contradiction between structural completion and porosity control.
2Reliability
If ceramic particles are used instead of fiber-based fillers, then densification is enabled, but the complexity of the manufacturing process increases
Solution Approach 1:
The invention performs preliminary classification of ceramic particles by size (D10-D90 ratio of 1.2-2.0) before incorporating them into the preform. This preliminary action ensures proper packing density and porosity control during CVI, enabling densification while actually simplifying the overall manufacturing process by avoiding post-processing issues.
Solution Approach 2:
By controlling the particle size distribution parameter (D10-D90 ratio within 1.2-2.0), the invention transforms the manufacturing process into a more controlled and repeatable process. This parameter control enables consistent densification outcomes while reducing the complexity of process monitoring and quality control.
3Reliability
If ceramic particles with specific size distribution are used, then porosity is reduced and thermal properties improve, but the cost of materials increases
Solution Approach 1:
The invention optimizes the particle size distribution parameter (D10-D90 ratio of 1.2-2.0) to achieve the minimum necessary porosity for thermal performance. This optimized parameter selection reduces material costs by avoiding excessive particle size control while still achieving the required thermal properties and densification.
Solution Approach 2:
The invention uses composite ceramic particles with specific material compositions (e.g., SiC/Si3N4/Al2O3 ratios) that provide excellent thermal properties at lower material costs. The composite approach allows cost-effective material selection while maintaining the required thermal performance and densification characteristics.
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 enhances densification, reducing porosity and improving thermal properties, thereby increasing the reliability and performance of CMC components in gas turbine engines.
Implementation Method 1
densified using chemical vapor infiltration
Data Source
AI summary
A method for forming a ceramic matrix composite component includes forming a fibrous preform of the component with a plurality of fiber layers and a fill region disposed between one or more of the plurality of fiber layers. Ceramic particles are provided in the fill region, which is densified using chemical vapor infiltration.