| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
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Coating and Thin Film Materials for Energy, Aerospace, Environment and Biological Applications
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| Presentation Title |
Infiltration Behavior of Calcium Magnesium Alumina-Silicate (CMAS) in Thermal Barrier Materials of YSZ, LZ, and LZ–YSZ Composite |
| Author(s) |
Guanlin Lyu, Dowon Song, Junseong Kim, Janghyeok Pyeon, SeungCheol Yang, Yeon-Gil Jung |
| On-Site Speaker (Planned) |
Guanlin Lyu |
| Abstract Scope |
Calcium magnesium alumina-silicate (CMAS) attack on TBCs is one of the reasons for the early delamination of TBCs. In this study, we evaluated the effects of CMAS on the microstructure evolution in yttria-stabilized zirconia (YSZ), lanthanum zirconate (LZ), and composite coating with a 50:50 volume ratio of YSZ and LZ (LZ–YSZ). YSZ was easily to be deteriorated by CMAS due to the de-stabilization of t’-YSZ. LZ showed the mitigated penetration of CMAS by reaction products, originated from high reactivity between LZ and molten CMAS. The LZ–YSZ composite showed a denser microstructure in the surface, resulting in retarding the penetration of CMAS. Therefore, the TBC with the LZ–YSZ composite will prolong the lifetime performance and protect the further corrosive degradation of TBCs in high-temperature environments. The infiltration behavior and the reaction mechanism of molten CMAS for the YSZ, LZ, and LZ–YSZ composite were discussed after CMAS attack for different periods. |