Metal Carbide Infiltration in C/C Composites for Oxidation Resistance
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Solution Overview
Problem
Carbon-carbon (C/C) composites used in high-temperature applications are susceptible to oxidation due to internal porosity, leading to deterioration of physio-mechanical properties and recession of components, as conventional antioxidant coatings fail to protect internal surfaces exposed through interconnected pores.
Innovation Solution
Infiltrating C/C composites with a metal fluid to form a metal carbide phase within interconnected pores, extending below the surface to act as a barrier against oxidation, while leaving closed pores unfilled to maintain structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If C/C composites are used in high temperature applications, then good mechanical properties and low mass density are achieved, but oxidation susceptibility increases due to internal porosity
Solution Approach 1:
The patent utilizes the inherent porous structure of C/C composites but transforms it from a weakness into a protective feature by infiltrating the pores with oxidation-resistant materials (silicon carbide, boron carbide, or diamond particles), thereby maintaining the lightweight structure while blocking oxidation pathways
Solution Approach 2:
The patent creates a multi-phase composite material system combining C/C composite with infiltrated oxidation-resistant phases (silicon carbide, boron carbide, or diamond), forming a hierarchical composite structure that leverages the advantages of each material while mitigating their individual weaknesses
2Object-affected harmful factors
If conventional antioxidant coatings are applied to C/C composite surfaces, then surface oxidation resistance is improved, but internal surfaces exposed through interconnected pores remain unprotected
Solution Approach 1:
The patent extracts and addresses the specific problem of internal pore exposure by selectively infiltrating only the interconnected pore structure with oxidation-resistant particles, rather than applying a conventional surface coating that would leave internal pathways vulnerable
Solution Approach 2:
The patent applies oxidation-resistant particles specifically within the interconnected pore network where oxidation occurs, creating localized protection exactly where needed rather than uniform surface coating, thereby protecting internal surfaces while maintaining overall structural integrity
3Reliability
If metal fluid is infiltrated to form metal carbide phase within interconnected pores, then oxidation resistance is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent employs a self-service mechanism where silicon-containing particles react with oxygen during processing to form silicon carbide in situ within the pores, eliminating the need for complex multi-step infiltration processes and utilizing the material's own chemical reactivity to create the protective phase
Solution Approach 2:
The patent controls the infiltration process by adjusting parameters such as particle size distribution, infiltration temperature, and oxygen exposure conditions to optimize silicon carbide formation, thereby managing manufacturing complexity through controlled parameter variations rather than process 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
Enhances oxidation resistance and extends the usable life of C/C composite components by blocking oxidizing agents from reaching internal surfaces, even after surface damage, with uniform protection and reduced recession rates.
Implementation Method 1
Infiltrating C/C composites with a metal fluid to form a metal carbide phase within interconnected pores
Implementation Method 2
reacting carbon of the first phase with the metal to form a second phase which includes silicon carbide
Implementation Method 3
the second phase is disposed on interior surfaces within interconnected pores of the first phase, infiltrating to a depth below the surface of the substrate to fill at least some of the interconnected pores, which may reduce or eliminate oxidation and ultimate recession of portions of the first phase
Data Source
AI summary
An article includes a substrate. The substrate includes at least two phases. The first phase includes a carbon-carbon (C/C) composite. The second phase includes a metal carbide. The second phase is disposed within a plurality of interconnected pores of the first phase, wherein the second phase extends from a surface of the substrate to a depth of at least 300 micrometers below the surface of the substrate.