| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Coatings to Protect Materials from Extreme Environments
|
| Presentation Title |
Protection of Yttria Stabilized Zirconia (YSZ) Surface from CMAS Attack by Sacrificial Layer of Si3N4 |
| Author(s) |
Said Bakkar, Elora Zucah, Tim Hossain, Jacob Moldenhauer, Ellen Steinmiller, Will Flanagan |
| On-Site Speaker (Planned) |
Said Bakkar |
| Abstract Scope |
Single crystal (110) of Yttria-stabilized zirconia (YSZ) Y2O3 8 mol% ZrO2 was covered with 10 μm of silicon nitride Si3N4 as a sacrificial layer using chemical vapor deposition (CVD). The Si3N4 layer was used to seal the YSZ surface to mitigate (calcium–magnesium–aluminum–silicon oxide) CMAS attack. CMAS testing was carried out on the covered and uncovered surfaces by melting 0.1g of the CMAS powder on the surface in a furnace at 1250 °C for 10 h. The conformal surface reaction of the sealed layer confirmed that no cracking and delamination at high temperatures (1250 °C). Scanning electron microscopy (SEM) micrographs confirmed that the surface of YSZ surface was successfully sealed. The newly coating of Si3N4 was shown to be a viable technique to significantly reduce CMAS infiltration in porous thermal barrier coatings. |