About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Hume-Rothery Symposium on Connecting Macroscopic Materials Properties to Their Underlying Electronic Structure: The Role of Theory, Computation, and Experiment
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Presentation Title |
Challenges in Addressing the Silicate Attack Problem in Gas Turbine Coatings |
Author(s) |
Carlos G. Levi |
On-Site Speaker (Planned) |
Carlos G. Levi |
Abstract Scope |
Molten silicate degradation of coatings designed for thermal and/or environmental protection of gas turbine structural components represents a fundamental barrier to progress by limiting the allowa-ble material temperatures. At the root failure mechanisms are thermomechanical in nature, driven by strain incompatibility during thermal cycling. The genesis of failure scenarios, however, is strongly influenced by thermochemical interactions with the environment and intrinsic evolution of the system. The silicate attack problem is complex, involving glassy melts containing at least five major oxide components, interacting with a coating material that can involve two or more oxides. Moreover, the melts originate from ingested mineral debris that can have a wide variability in com-position depending on geographical origin and distribution in the atmosphere. A proposed strategy is inspired on ICME principles and combines Calphad, machine learning, and models connecting composition and relevant properties. The challenges involved and progress in implementing the proposed strategy are discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Environmental Effects, High-Temperature Materials, Computational Materials Science & Engineering |