Composite Article Metal-Containing Layer Phase-Specific Seed Particles
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Solution Overview
Problem
Gas turbine engine components face challenges in forming a specific, stable oxide phase to protect against high temperatures, as existing thermal barrier layers often form weaker non-alpha-alumina phases that can lead to spallation under operating conditions.
Innovation Solution
A composite article with a metal-containing layer that includes phase-specific seed particles, such as alpha-alumina seeds, is used to promote the formation of a selected oxide phase, like alpha-alumina, by seeding the surface or interior of the layer and subjecting it to thermal treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thermal barrier layers are used, then the component is protected against high temperatures, but the layers form non-alpha-alumina phases that are weaker and prone to spallation
Solution Approach 1:
The patent applies preliminary action by incorporating phase-specific seed particles (such as alpha-alumina seeds) into the metal-containing layer before oxidation occurs. These pre-placed seeds promote the formation of the desired alpha-alumina phase during subsequent thermal exposure, ensuring that the strong, spallation-resistant phase forms preferentially over weaker non-alpha phases.
Solution Approach 2:
The patent utilizes parameter changes by controlling oxidation conditions (temperature, time, atmosphere) in combination with the seed particles to favor the formation of alpha-alumina phase. The seed particles alter the phase transformation parameters, enabling the system to produce the desired oxide phase structure under specific thermal conditions.
2Reliability
If thermal treatment is applied to form oxide phases, then protective oxide layers are created, but the process requires extended time and high temperature
Solution Approach 1:
By pre-incorporating phase-specific seed particles into the metal-containing layer, the patent eliminates the need for prolonged thermal treatment to initiate phase formation. The seeds are already in place to guide rapid phase transformation, significantly reducing the time and temperature requirements for forming the protective alpha-alumina oxide layer.
Solution Approach 2:
The phase-specific seed particles act as intermediaries that facilitate the oxidation process. These seeds serve as nucleation sites that accelerate the formation of protective oxide phases, allowing the system to achieve the desired protective layer much faster than conventional thermal treatment alone would permit.
3Stability of the object's composition
If phase-specific seed particles are incorporated, then alpha-alumina formation is promoted, but the layer structure becomes more complex
Solution Approach 1:
The patent applies local quality by incorporating phase-specific seed particles at specific locations and concentrations within the metal-containing layer. Rather than uniformly complicating the entire structure, the seeds are strategically placed to locally promote alpha-alumina formation where needed, maintaining overall structural simplicity while achieving phase stability.
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 approach reduces the time and temperature required for alpha-alumina nucleation and growth, forming a protective alumina layer that slows oxygen diffusion and enhances the thermal barrier, reducing spallation and improving the durability of the thermally grown oxide layer.
Implementation Method 1
nucleate and grow a selected one of the plurality of different oxide phases in the aluminum-containing layer from the a plurality of phase-specific seed particles
Implementation Method 2
The metal of the metal-containing layer is oxidizable to a plurality of different oxide phases
Implementation Method 3
forming a protective alumina layer that slows oxygen diffusion
Data Source
AI summary
A composite article includes a substrate and a metal-containing layer on the substrate. The metal of the metal-containing layer is oxidizable to a plurality of different oxide phases. The metal-containing layer includes a plurality of phase-specific seed particles promoting formation of a selected one of the different oxide phases.