About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
Coatings to Protect Materials from Extreme Environments
|
Presentation Title |
Understanding Modes of Mixed Deposit-Induced Degradation on Advanced Alloys and Bond Coat Systems |
Author(s) |
Atharva S. Chikhalikar, Eeshani Godbole, David L Poerschke |
On-Site Speaker (Planned) |
Atharva S. Chikhalikar |
Abstract Scope |
Understanding the corrosive effects of ingested debris on alloys and protective coatings is critical for developing next-generation turbine materials. Although intermediate-temperature degradation of alloy components has been studied extensively in the presence of simple sulfate deposits (e.g., Na2SO4), there is limited knowledge of degradation processes in the presence of deposits containing multiple cations and mixed anions. This work expands the understanding of deposit-induced alloy degradation under mixed, multi-cation oxide and sulfate deposits. A systematically defined set of deposit compositions were used to understand the influence of specific anions and cations on the oxidation of alumina-forming high-temperature alloys. The oxidized samples were characterized to identify phase transformations in the thermally grown oxide and observe the corresponding corrosion morphology. Complementary computational thermodynamics models were used to understand the deposit stability. The results provide an enhanced understanding of the effect of anions on the degradation of alloys and implications for developing new materials. |