About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
High Temperature Oxidation of Metals and Ceramics
|
Presentation Title |
Oxidation and Erosion Implications of CMAS on Environmental Barrier Coatings |
Author(s) |
Bryan J. Harder, Kang N Lee, Michael J Presby, Benjamin Kowalski, Jamesa L Stokes, John Setlock |
On-Site Speaker (Planned) |
Bryan J. Harder |
Abstract Scope |
In recent years, silicon-based ceramic matrix composites (CMCs) with environmental barrier coatings (EBCs) have been incorporated into the hot section components of gas turbine engines. These materials offer the possibility of higher operating temperatures as well as reduced cooling requirements, which can provide increased turbine efficiencies. However, with component temperatures exceeding 1300°C, environmental challenges become increasingly complex. Coating systems must endure steam-induced oxidation and volatilization, thermomechanical loads, erosion, foreign object damage, as well as calcia-magnesia-aluminosilicate (CMAS) exposure. While it important to characterize these individual failure mechanisms, it is likely the summation and interactions of them that will ultimately determine coating and component lifetimes. In this work, we will explore oxidation in steam environments and erosion performance of an EBC/SiC system that has been exposed to various CMAS compositions. Performance of these coatings exposed to CMAS will be compared to state-of-the-art coatings and the degradation modes will be discussed. |