Fugitive Fiber Commingling for Ceramic Matrix Infiltration
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Solution Overview
Problem
Ceramic matrix composites (CMCs) face challenges in infiltration during manufacturing due to fiber-fiber contact and 'pesting' issues, which affect the quality and performance of the final product.
Innovation Solution
A method involving commingling ceramic fibers with a fugitive fiber to form a ceramic fiber tow, where the fugitive fiber is positioned between ceramic fibers, creating a space that can be filled with a ceramic matrix, improving infiltration and reducing abrasion and bonding issues during the CMC manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ceramic fibers are bundled tightly together in a fiber tow, then the structural integrity and strength of the tow is improved, but the infiltration of ceramic matrix into the fiber spaces becomes difficult
Solution Approach 1:
A fugitive fiber is introduced as an intermediary element positioned between ceramic fibers during tow formation. This fugitive fiber temporarily maintains fiber separation and creates channels for ceramic matrix infiltration, then is removed after infiltration to leave void spaces that facilitate complete matrix penetration while maintaining fiber tow integrity throughout the process
Solution Approach 2:
The fugitive fiber is positioned between ceramic fibers in advance during tow formation, creating predetermined infiltration pathways before the infiltration process begins. This preliminary arrangement ensures that ceramic matrix can penetrate the fiber tow uniformly without requiring excessive force or causing fiber displacement during the infiltration operation
2Quantity of substance
If ceramic fibers are in direct contact with each other, then the density of the fiber tow is improved, but fiber-fiber abrasion and bonding issues cause 'pesting' during processing
Solution Approach 1:
The fugitive fiber serves as a protective intermediary between ceramic fibers, preventing direct fiber-to-fiber contact during handling and processing. This intermediary layer reduces mechanical abrasion and unwanted bonding between ceramic fibers, eliminating the pesting phenomenon while maintaining appropriate fiber tow density for structural performance
3Manufacturing precision
If fugitive fiber is removed after infiltration, then the infiltration quality is improved by creating void spaces, but the structural integrity during handling becomes compromised
Solution Approach 1:
The fugitive fiber is strategically positioned between ceramic fibers during tow formation, creating a temporary support structure that maintains fiber separation and tow integrity. This preliminary positioning ensures the fiber tow remains handleable and structurally sound throughout the infiltration process, with the fugitive fiber serving as a sacrificial element that is removed only after infiltration is complete
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 approach enhances the infiltration process and reduces 'pesting' in CMCs by maintaining a controlled distance between ceramic fibers, leading to improved manufacturing efficiency and product quality.
Implementation Method 1
removing the fugitive fiber from the ceramic fiber tow leaving a space between at least two ceramic fibers of the ceramic fiber tow
Implementation Method 2
replacing the spaces between ceramic fibers included in the ceramic fiber tows with a ceramic matrix
Data Source
AI summary
A method of making a ceramic fiber tow and the system regarding the same may be included. The method may include commingling a plurality of ceramic fibers with a fugitive fiber to form a single ceramic fiber tow. The fugitive fiber may be positioned between at least two ceramic fibers included in the single ceramic fiber tow. The method may further include forming a porous ceramic preform including at least the single ceramic fiber tow. The method may further include removing the fugitive fiber from the ceramic fiber tow leaving a space between at least two ceramic fibers of the single ceramic fiber tow. The method may further include replacing the spaces between ceramic fibers included in the ceramic fiber tows with a ceramic matrix.