Low-Friction Rods for CMC Slurry Infiltration and Cleaning
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Solution Overview
Problem
The existing slurry infiltration process for ceramic matrix composites (CMCs) faces challenges in efficiently removing excess slurry from internal cavities or bores, as it tends to accumulate and cure, making the process time-consuming and difficult.
Innovation Solution
Inserting rods with low-friction surfaces into the hollow portion of a porous fiber preform before slurry infiltration, allowing the slurry to penetrate and facilitating easy removal of excess slurry upon withdrawal, thereby reducing accumulation and simplifying the cleaning process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If slurry infiltration is performed on a porous fiber preform with internal cavities, then the preform is successfully impregnated with ceramic matrix, but excess slurry accumulates in internal cavities making removal difficult and time-consuming
Solution Approach 1:
The internal cavity is segmented by inserting multiple rods that divide the hollow portion into multiple regions. This segmentation prevents slurry from accumulating as a continuous mass and enables easier removal through the rod interstices
Solution Approach 2:
Rods with low-friction surfaces act as intermediaries that facilitate slurry removal. The rods temporarily occupy the cavity during infiltration, then serve as extraction pathways when withdrawn, carrying excess slurry out of the cavity
2Ease of operation
If rods are inserted into the hollow portion to facilitate slurry removal, then excess slurry can be easily removed upon withdrawal, but the device complexity increases
Solution Approach 1:
The rods are simple, inexpensive components that are inserted, serve their function during infiltration and removal, then discarded. Their temporary use avoids the need for complex reusable extraction mechanisms
Solution Approach 2:
The rods are designed with specific parameter characteristics (low-friction surfaces with coefficient of static friction of about 0.1 or less) that enable easy slurry release upon withdrawal, optimizing the removal function
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 reduces the amount of excess slurry that accumulates in internal cavities, streamlining the infiltration and cleaning process, and enabling the production of CMC components with internal cavities or bores more efficiently.
Implementation Method 1
Each of the rods has a low-friction surface comprising a coefficient of static friction of about 0.1 or less
Implementation Method 2
the slurry infiltrates the porous fiber preform. Some fraction of the particulate solids is deposited within interstices of the porous fiber preform
Data Source
AI summary
A method of slurry infiltration and cleaning to fabricate a ceramic matrix composite (CMC) component with an internal cavity or bore comprises inserting a number of rods into a hollow portion of a porous fiber preform, thereby forming a rod arrangement substantially filling the hollow portion. Each of the rods has a low-friction surface comprising a coefficient of static friction of about 0.1 or less. The porous fiber preform is exposed to a slurry comprising particulate solids in a liquid carrier, and the slurry infiltrates the porous fiber preform. Some fraction of the particulate solids is deposited within interstices of the porous fiber preform to form an impregnated fiber preform, and another fraction of the particulate solids is deposited within the hollow portion as excess slurry. After slurry infiltration, the rods are withdrawn from the hollow portion, and at least some of the excess slurry is removed with the rods.