Si-Al-C-N-O Solid Solution Protective Layer for High-Temperature Stability
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Solution Overview
Problem
Existing materials for gas turbine engine components face challenges in providing adequate thermal and oxidative protection under severe environmental conditions, as they often lack sufficient stability at high temperatures and are prone to corrosion and oxidative damage.
Innovation Solution
A composite article featuring a silicon-aluminum-carbon-nitrogen-oxygen (Si-Al-C-N-O) solid solution composition and microstructure as a protective layer, which is chemically inter-bonded and free of discrete silicon carbide and aluminum nitride phases, along with optional filler additives like metals, oxides, or silicates to enhance thermal and oxidative stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional ceramic or metallic materials are used for gas turbine engine components, then the components can operate under severe environmental conditions, but they lack sufficient thermal and oxidative stability at high temperatures
Solution Approach 1:
The patent applies composite materials by creating a protective layer with a complex multi-element solid solution composition (Si-Al-C-N-O) that combines multiple elements to achieve both high temperature stability and oxidative resistance. This composite approach allows the material to exhibit properties superior to individual conventional ceramics or metals, resolving the contradiction between thermal stability and oxidative stability through synergistic element interactions.
Solution Approach 2:
The patent employs parameter changes by modifying the chemical composition parameters of the protective layer to achieve a specific solid solution phase. By controlling the ratios and combinations of Si, Al, C, N, and O elements, the material achieves enhanced thermal and oxidative stability simultaneously, transforming the material properties to overcome the limitations of conventional single-phase materials.
2Reliability
If discrete regions of silicon carbide and aluminum nitride phases are used in the protective layer, then the material provides thermal protection, but it lacks superior oxidative stability above 1600°C
Solution Approach 1:
The patent applies homogeneity by creating a uniform solid solution phase where Si, Al, C, N, and O elements are distributed evenly throughout the protective layer. This homogeneous solid solution eliminates the discrete phase boundaries and interfaces present in conventional composite ceramics, resulting in improved oxidative stability above 1600°C and enhanced compositional stability, as the uniform structure prevents preferential oxidation at phase boundaries.
3Object-affected harmful factors
If traditional protective coatings are applied to substrates, then thermal protection is achieved, but the components remain prone to corrosion and oxidative damage
Solution Approach 1:
The patent uses composite materials to create a protective layer with enhanced corrosion resistance while maintaining high temperature stability. The multi-element solid solution composition (Si-Al-C-N-O) provides a synergistic effect where each element contributes specific properties: Si and Al provide oxidation resistance, C and N enhance high temperature stability, and O ensures proper stoichiometry. This composite structure protects the substrate from both corrosion and oxidative damage at high temperatures, overcoming the limitations of traditional single-material coatings.
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 Si-Al-C-N-O solid solution composition and microstructure provides superior thermal and oxidative stability above 1600°C, effectively protecting the substrate from high-temperature and corrosive environments, while filler additives further enhance stability and self-repair microcracks, ensuring prolonged component lifespan.
Implementation Method 1
The protective layer has a silicon-aluminum-carbon-nitrogen-oxygen solid solution composition and microstructure that includes a chemically inter-bonded network of silicon, aluminum, carbon, nitrogen and oxygen atoms
Implementation Method 2
The Si-Al-C-N-O solid solution composition and microstructure provides superior thermal and oxidative stability above 1600°C, effectively protecting the substrate from high-temperature and corrosive environments
Data Source
Figure 1~3
AI summary
A composite article includes a substrate and a protective layer disposed on the substrate. The protective layer has a silicon-aluminum-carbon-nitrogen solid solution composition and microstructure.