期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 39, 期 7, 页码 2379-2388出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.02.041
关键词
La2Ce2O7; Ta2O5 doping; Thermal conductivity; Failure mechanism
资金
- National Natural Science Foundation of China [51501137, 51702244, 51875424]
- Natural Science Foundation of Hubei Province [2017CFB285]
- Science and Technology Research Project of Jiangxi Province Education Department [GJJ160791]
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 similar to 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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