About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advanced Materials for Harsh Environments
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| Presentation Title |
Hot Corrosion Characteristics of 8YSZ Doped with CSZ and YTiZ in Molten V2O5 for Potential Use in Thermal Barrier Coatings |
| Author(s) |
Nestor Kodzo Ankah, Nasirudeen Ogunlakin, Zuhair M Gasem, Morsi M Mahmoud |
| On-Site Speaker (Planned) |
Nestor Kodzo Ankah |
| Abstract Scope |
The study examines the hot corrosion resistance of composite thermal barrier powders made from 8-yttria stabilized zirconia doped with ceria and titania yttria zirconia. The powders were characterized using FESEM, EDS, and XRD to assess their microstructure and phase evolution.
Exposure of standard 8YSZ to molten V₂O₅ resulted in degradation consistent with Lewis acid-base reaction principles. V₂O₅ selectively reacts with the stabilizing Y₂O₃ to form yttrium vanadate (YVO₄), leading to the detrimental transformation of tetragonal zirconia (t-ZrO₂) into the less stable monoclinic zirconia (m-ZrO₂). Doping 8YSZ with CSZ resulted in the formation of cerium vanadate (CeVO₄) alongside a significant reduction in YVO₄. This minimized the amount of m-ZrO₂ formation.
8YSZ doped with YTiZ displayed exceptional hot corrosion resistance in V₂O₅. The formation of YVO₄ was significantly reduced, leading to a substantial decrease in the m-ZrO₂ phase. This remarkable resistance is likely due to the stabilizing effect of incorporated Ti⁴⁺ ions. |