Ceramic Matrix Composite Preform Channels for Uniform Infiltration
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Solution Overview
Problem
Current methods for forming ceramic matrix composites using chemical vapor infiltration result in non-uniform microstructures due to faster matrix deposition near the exterior surface, leading to less desirable physical properties.
Innovation Solution
Employing a preform with direct channels extending from the exterior to the interior, free of char, allows for uniform permeation of infiltration gases, ensuring quicker and more uniform infiltration and a denser microstructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical vapor infiltration is used to form ceramic matrix composite, then the composite can be formed with high temperature capability and light weight, but the matrix deposition is faster near the exterior surface resulting in non-uniform microstructure
Solution Approach 1:
The preform is segmented into multiple layers with through-thickness channels created by removing tows from each layer. This segmentation allows infiltration gases to reach the interior space directly, bypassing the exterior surface pathway and enabling uniform matrix deposition throughout the composite structure.
Solution Approach 2:
Direct channels are introduced extending in the thickness dimension (Z-direction) through the preform layers. This adds a new dimensional pathway for gas infiltration, allowing chemicals to reach interior regions directly rather than only through lateral diffusion from exterior surfaces, thereby achieving uniform microstructure.
2Productivity
If traditional preform structure is used, then the preform can be manufactured simply, but the infiltration process is slower and less uniform
Solution Approach 1:
The preform is divided into layers with through-thickness channels formed by removing specific tows from each layer. This segmentation creates multiple direct pathways for infiltration gases, significantly increasing infiltration speed while ensuring uniform distribution of matrix material throughout the composite.
Solution Approach 2:
Through-thickness channels act as intermediary pathways between the exterior surface and interior space. These channels facilitate rapid and uniform transport of infiltration gases directly to the interior region, improving both infiltration speed and microstructure uniformity simultaneously.
3Manufacturing precision
If direct channels are added to the preform, then uniform infiltration is achieved, but the preform structure becomes more complex
Solution Approach 1:
The preform is segmented into discrete layers, with through-thickness channels formed by systematically removing tows from each layer. This segmentation approach simplifies the manufacturing process compared to creating complex three-dimensional channel networks, as each layer can be processed independently using standard textile preform techniques.
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 use of direct channels in the preform leads to a more uniform and dense ceramic matrix composite with improved physical properties.
Implementation Method 1
allows for uniform permeation of infiltration gases
Implementation Method 2
infiltrating the preform having direct channels with matrix material
Data Source
AI summary
Disclosed is a preform for a ceramic matrix composite including direct channels extending from an exterior surface of the preform to an interior space of the preform wherein the direct channels are free of char.