Preceramic Ionic Systems for Turbine Engine CMCs
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Solution Overview
Problem
Conventional methods struggle to effectively process silicon carbide-based ceramic materials due to their hardness and non-melting characteristics, and there is a need for a new process to produce advanced silicon carbide-based ceramic materials.
Innovation Solution
A process involving the formation of Si-based polymeric compositions, such as polycarbosilanes, functionalized with ionizable side groups like hydrogel components, which are then heated to produce ceramic materials suitable for high-temperature applications, including turbine engine components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional methods are used to process silicon carbide-based ceramic materials, then the material properties (hardness, thermal stability) are maintained, but the processability deteriorates due to hardness and non-melting characteristics
Solution Approach 1:
The patent applies parameter changes by transforming the processing state of silicon carbide from solid-phase (impossible to process) to liquid-phase (processable). The preceramic polymer is heated to decomposition temperature where it undergoes phase change and releases silicon carbide particles in a processable state, allowing shaping and forming operations that would be impossible with conventional solid silicon carbide materials.
Solution Approach 2:
The invention uses composite materials by creating a preceramic polymer composition that contains organometallic compounds combined with silicon-containing polymers. This composite structure allows the material to possess both the desirable final ceramic properties and the processability of organic polymers during manufacturing, resolving the contradiction between hardness and ease of manufacture.
2Temperature
If silicon carbide ceramic materials are used for high-temperature applications, then thermal stability is improved, but processing complexity increases due to non-melting characteristics
Solution Approach 1:
The patent applies preliminary action by performing the chemical decomposition and phase transformation of the preceramic polymer before the final forming operation. The organometallic compounds are pre-incorporated into the polymer structure, and the decomposition process is initiated in advance to create a processable slurry or melt state, simplifying subsequent processing steps while maintaining thermal stability.
Solution Approach 2:
The preceramic polymer acts as an intermediary material between conventional organic polymers and final inorganic ceramic products. This intermediary state allows processing at lower temperatures using standard polymer processing techniques, then transforms into the high-temperature stable ceramic through controlled decomposition, reducing overall processing complexity.
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
This process enables the creation of advanced silicon carbide-based ceramic materials with improved processing and high-temperature performance, suitable for applications in turbine engines and other extreme environments.
Implementation Method 1
heated to produce ceramic materials
Data Source
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AI summary
A process of forming a Si-containing ceramic comprises forming a Si-based polymeric composition. The process includes neutralizing a charge of said Si-based polymeric composition. The process includes adding thermal energy under a controlled atmosphere to the Si-based polymeric composition. A turbine engine component comprises an airfoil and the airfoil comprises a Ceramic Matrix Composite (CMC) material.