Multiphase Glass Coating for Carbon-Carbon Composite Oxidation
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Solution Overview
Problem
Carbon-carbon composite components, such as those in aircraft braking systems, experience significant oxidation despite existing phosphate-based oxidation protection systems, leading to material loss and weakening due to high operating temperatures and infiltration of oxygen and contaminants.
Innovation Solution
A multiphase oxidation protection system comprising a first glass phase with a phosphate glass composition and a second sealing glass phase, where the second glass phase has a transition temperature at least 100°C higher than the first, applied as a slurry to the carbon-carbon composite structure, followed by heating to adhere and enhance protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If phosphate-based oxidation protection systems are used, then infiltration of oxygen and oxidation catalysts is reduced, but significant oxidation damage still occurs at high operating temperatures
Solution Approach 1:
The oxidation protection system is divided into multiple glass phases with different transition temperatures. The first glass phase (phosphate-based) provides initial protection against oxygen infiltration, while the second glass phase (sealing glass with higher transition temperature) provides enhanced protection at elevated temperatures. This segmentation allows each phase to operate optimally in its temperature range, resolving the contradiction between reducing oxygen infiltration and maintaining protection effectiveness at high temperatures.
Solution Approach 2:
The invention uses a composite glass system comprising multiple glass phases with distinct properties. The combination of phosphate glass (first phase) and sealing glass (second phase) creates a composite protection layer that leverages the strengths of each component. The phosphate phase provides good chemical stability and oxygen barrier properties at lower temperatures, while the sealing glass phase maintains structural integrity and protective function at high operating temperatures up to 900°C, thereby resolving the limitation of single-phase systems.
2Adaptability or versatility
If a single glass phase is used for oxidation protection, then the system is simple to apply, but it cannot provide sufficient protection across the full temperature range up to 900°C
Solution Approach 1:
The protection system is segmented into multiple glass phases, each optimized for specific temperature ranges. The first glass phase handles lower temperature protection, while the second glass phase with higher transition temperature takes over at elevated temperatures. This segmentation enables the system to adapt to the full temperature range up to 900°C without requiring a single complex glass composition.
Solution Approach 2:
The invention changes the physical and chemical parameters of the glass system by incorporating multiple phases with different transition temperatures. The first glass phase has a lower transition temperature suitable for initial protection, while the second glass phase has a higher transition temperature (at least 100°C higher) that activates at elevated temperatures. This parameter differentiation allows the system to maintain protective properties across the entire operating temperature range.
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 multiphase glass system significantly reduces oxidation damage by providing enhanced resistance to migration at high temperatures, thereby minimizing material loss and maintaining the integrity of carbon-carbon composite components.
Implementation Method 1
Phosphate-based oxidation protection systems may reduce infiltration of oxygen and oxidation catalysts into the composite
Implementation Method 2
heating the carbon-carbon composite structure to a temperature sufficient to adhere the multiphase glass slurry to the carbon-carbon composite structure
Data Source
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AI summary
The present disclosure includes carbon-carbon composite articles having multiphase glass oxidation protection coatings for limiting thermal and/or catalytic oxidation reactions and methods for applying multiphase glass oxidation protection coatings to carbon-carbon composite articles.