Environmental degradation of high-temperature protective coatings for ceramic-matrix composites in gas-turbine engines
By N. Padture. npj Materials Degradation, 2019
166 citations recorded by the source corpus.
The need for higher efficiencies and performance in gas-turbine engines that propel aircraft in the air, and generate electricity on land, is pushing the operating temperatures of the engines to unprecedented levels. Replacing some of the current hot-section metallic components with ceramic-matrix composites (CMCs) is making that possible. A high-temperature ceramic coatings system, that includes environmental-barrier coatings (EBCs), are needed to protect CMCs. However, these coatings undergo degradation in the highly hostile environment of the gas-turbine engine consisting of a combination of high gas temperatures, pressures, and velocities. In addition, there is the ubiquitous presence of steam (a combustion by-product) and occasional ingestion of calcia-magnesia-aluminosilicates (CMASs) in the form of dust, sand, or ash from the environment. Steam can cause corrosion of EBCs, and the molten CMAS deposits can react with the EBCs resulting in their failure. This article provides a perspective on the understanding of these degradation mechanisms, and possible approaches, guided by that understanding, for mitigating the degradation. An outlook on the future challenges and opportunities is presented.
Subfields: Aerospace Engineering, Ceramics and Composites, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/1005f52c77d7df2259fa86bd9dee7b4fe1c604df
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In Aerospace Engineering
In Ceramics and Composites
In Materials Chemistry
Citations in the corpus
- A review on environmental barrier coatings: History, current state of the art and future developments (2020, background): “This chemical criterion has been suggested as a potential quantity useful for comparison between different compositions, as higher optical basicity values correlate to lower steaminduced volatility [1].”