| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Coatings to Protect Materials from Extreme Environments
|
| Presentation Title |
High Temperature Stability and Decomposition of Mixed Oxide and Sulfate CMFAS-type Deposits and Implications for Coating Degradation |
| Author(s) |
Eeshani Paresh Godbole, Atharva Chikhalikar, David Poerschke |
| On-Site Speaker (Planned) |
Eeshani Paresh Godbole |
| Abstract Scope |
Deposit-induced degradation of alloys, bond coats, and thermal/environmental barrier coatings is a critical performance- and life-limiting challenge. Understanding the intrinsic behavior of ingested deposits is key to designing robust next generation coatings. Although the behavior of oxide-based deposits (CMFAS) have been studied extensively, that of mixed anion, (oxide/sulfate/chloride) deposits is less well understood. This study advances the understanding of multi-cation sulfate-oxide deposits. Deposit compositions, chosen to maximize experimental insights while leveraging existing knowledge, were synthesized and heat treated over a range of temperatures relevant to hot corrosion and coating degradation. The heat-treated samples were then analyzed to understand the sulfate decomposition and other structural changes. The results show that the presence of oxides significantly accelerates the decomposition of sulfates. Computational thermodynamics models were used to further understand these effects. These results provide insights into the influence of multiple anions on the stability and reactivity of complex deposits. |