Superabsorbent Polymer Filament Sizing for CMC Infiltration
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Solution Overview
Problem
Ceramic matrix composites often have large voids between adjacent tows of a preform that become defects after matrix infiltration, diminishing interlaminar properties.
Innovation Solution
Incorporating a superabsorbent polymer into ceramic tows that expands upon hydration to disperse filaments, reducing filament packing density and creating a more uniform pore distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ceramic tows are used in woven preforms, then structural integrity is maintained, but large voids form between adjacent tows creating defects after matrix infiltration
Solution Approach 1:
The patent segments the ceramic tows by dispersing filaments within each tow using superabsorbent polymer. This breaks up the continuous tow structure into separated filament bundles, creating numerous small voids throughout the material rather than few large voids between tows. The segmented filament structure increases surface area for matrix infiltration while maintaining structural integrity.
Solution Approach 2:
The patent applies local quality by introducing superabsorbent polymer specifically within the ceramic tows to create localized filament dispersion. This targeted treatment modifies only the internal structure of the tows while preserving the overall woven architecture. The local dispersion of filaments creates optimized pore distribution in specific regions without affecting the global structural integrity.
2Ease of manufacture
If filaments are dispersed within tows to increase contact surface area, then infiltration accessibility improves, but filament packing density must be reduced
Solution Approach 1:
The patent utilizes parameter changes by controlling the expansion of superabsorbent polymer in response to liquid absorption. This parameter change (polymer expansion) directly controls filament separation and packing density. By adjusting the amount of polymer and liquid absorbed, the filament dispersion and resulting pore structure can be precisely controlled to optimize both accessibility and structural integrity.
Solution Approach 2:
The superabsorbent polymer acts as an intermediary substance that mediates between the ceramic filaments and the infiltration matrix. It temporarily occupies space between filaments, forcing them apart to create voids, then serves as a placeholder during matrix infiltration. The polymer is subsequently removed, leaving the desired dispersed filament structure with optimized porosity.
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
Enhances matrix infiltration by increasing contact surface area and reducing defects, resulting in improved interlaminar properties of the composite structure.
Implementation Method 1
introducing water to the plurality of ceramic tows to cause the superabsorbent polymer to expand
Implementation Method 2
cause the superabsorbent polymer to expand and force apart adjacent ones of the subset of the plurality of filaments
Data Source
AI summary
A method of preparing a ceramic fabric for use in a ceramic matrix composite includes arranging a plurality of ceramic tows, each comprising a plurality of filaments, introducing a superabsorbent polymer to the plurality of ceramic tows such that an amount of the superabsorbent polymer surrounds at least a subset of the plurality of filaments within each of the plurality of ceramic tows, and introducing water to the plurality of ceramic tows to cause the superabsorbent polymer to expand and force apart adjacent ones of the subset of the plurality of filaments within each of the plurality of ceramic tows. Expansion of the superabsorbent polymer within one of the plurality of ceramic tows reduces a filament packing density of the one of the plurality of ceramic tows.