Thermal and mechanical properties of Ta2O5 doped La2Ce2O7 thermal barrier coatings prepared by atmospheric plasma spraying
In: Journal of the European Ceramic Society, Jg. 39 (2019-07-01), S. 2379-2388
Online
unknown
Zugriff:
La2Ce2O7 (LC) is a new promising thermal barrier coating (TBC) material for high-temperature applications. However, the sudden decrease of thermal expansion coefficient (TEC) at ∼623 K limits its application. In this study, the plasma-sprayed La2Ce1.7Ta0.3O7.15 (LCT) coating was developed by partial substitution of Ce4+ in LC with Ta5+. LCT coating shows lower thermal conductivity between 298 K and 1273 K (0.54–0.71 W/(m·K)) than LC coating (0.65–0.85 W/(m·K)) and the traditional yttria partially stabilized zirconia (YSZ) coating (1.53–1.72 W/(m·K)). It also exhibits excellent thermal stability at least up to 1573 K for 1000 h. What is more, the sudden TEC drop is suppressed owing to the reduced oxygen vacancy concentration governed by Ta5+-substitution content. As a result, LCT TBC shows an improved thermal cycling lifetime in an air furnace as compared to LC TBC.
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Thermal and mechanical properties of Ta2O5 doped La2Ce2O7 thermal barrier coatings prepared by atmospheric plasma spraying
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Autor/in / Beteiligte Person: | Zhou, Xin ; Duo, Shuwang ; Yang, Xiong ; Deng, Longhui ; Zhang, Hao ; Sun, Junbin ; Cao, Xueqiang ; Dong, Shujuan ; Jiang, Jianing ; Yuan, Jieyan ; Zeng, Jinyan |
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Zeitschrift: | Journal of the European Ceramic Society, Jg. 39 (2019-07-01), S. 2379-2388 |
Veröffentlichung: | Elsevier BV, 2019 |
Medientyp: | unknown |
ISSN: | 0955-2219 (print) |
DOI: | 10.1016/j.jeurceramsoc.2019.02.041 |
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