Preceramic Adhesive Composition for Fiber Array Bonding
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Solution Overview
Problem
Existing methods for forming fiber-reinforced ceramic matrix composites face challenges in effectively bonding fiber arrays during the lay-up and infiltration process, as fugitive adhesives often burn off completely, leaving gaps and compromising the integrity of the final composite.
Innovation Solution
A preceramic-polymer-based adhesive is used to bond fiber arrays, which converts to an integral ceramic phase through pyrolysis, ensuring a strong and continuous interface between fiber arrays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fugitive adhesive is used to bond fiber arrays during lay-up and infiltration, then the fiber arrays can be held together during processing, but the adhesive burns off completely leaving gaps and compromising the integrity of the final composite
Solution Approach 1:
The adhesive material composition is changed from a traditional fugitive adhesive to a preceramic polymer that can transform into ceramic. This parameter change in material chemistry allows the adhesive to maintain its bonding function during processing and then convert to a stable ceramic phase that fills gaps and maintains integrity in the final composite structure.
Solution Approach 2:
The adhesive undergoes a phase transition from organic preceramic polymer to inorganic ceramic through pyrolysis. This phase transition enables the adhesive to fulfill its temporary bonding role and then transform into a permanent structural component that eliminates gaps and reinforces the composite integrity.
2Reliability
If a preceramic-polymer-based adhesive is used to bond fiber arrays, then the adhesive converts to an integral ceramic phase through pyrolysis ensuring strong interface, but the processing complexity increases
Solution Approach 1:
The bonding function and the final structural reinforcement function are merged into a single material system. The preceramic polymer adhesive serves dual purposes: it bonds fiber arrays during processing and transforms into ceramic that reinforces the final composite, eliminating the need for separate adhesive and matrix materials.
Solution Approach 2:
The preceramic polymer adhesive performs multiple functions: it acts as a temporary bond during lay-up, survives the infiltration process, and transforms into a permanent ceramic phase that strengthens the composite structure. This multi-functionality reduces the need for multiple specialized materials and processes.
3Device complexity
If traditional fugitive adhesives are used, then the processing is simpler, but gaps are left in the final composite reducing cohesion
Solution Approach 1:
The potential harm of adhesive burn-off is converted into a benefit. Instead of the adhesive simply disappearing and leaving gaps, it undergoes controlled pyrolysis to form ceramic material that actively fills gaps and reinforces the composite structure, turning the loss of organic material into gain of inorganic reinforcement.
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 preceramic adhesive forms a robust ceramic phase that maintains structural integrity by integrating with the matrix material, enhancing the composite's cohesion and reducing gaps.
Implementation Method 1
converting the preceramic-polymer-based adhesive into an integral ceramic phase of the component by pyrolysis
Implementation Method 2
the filler participates in a reaction with at least one of the resin phase and the matrix material during the converting step
Data Source
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AI summary
A method of preparing a composite preform includes applying a tacky preceramic-polymer-based adhesive on a first fiber array arranging a second fiber array on the first fiber array, the adhesive holding the first and second fiber arrays together. A composite component is also disclosed.