Effects of 7YSZ doping on properties of lanthanum cerate coatings
- DOI
- 10.2991/ifeesd-16.2016.105How to use a DOI?
- Keywords
- Lanthanum cerate, 7YSZ doped; Thermal physical properties; Sintering-resistance
- Abstract
Lanthanum cerate(La2Ce2O7, LC) is a typically material with fluorite structure, which an attractive new generation TBC material due to low thermal conductivity, relative higher thermal expansion coefficient and excellent high temperature phase stability. Sintering-resistance of LC sharply decreased above 1518K is the main reason for LC as new TBC with target service temperature above 1573K. The effect of 7YSZ doping LC on thermal physical properties, sintering-resistance were studied. La2Ce2.5O8 sprayed powders doped with 1~10mass% 7YSZ were synthesized by solid-phase synthesis and agglomerated-sintering method, and ceramic coatings were prepared in the same process condition. The LC coatings doped with 7YSZ retained lower thermal conductivity (0.7~0.8Wúm-1K-1 at 1573K with about 80% relative density) compare to the LC coating (0.723Wúm-1K-1 at 1573K with 75.4% relative density), and also exhibited excellent phase stability between room temperature and 1773K. Dilatometric measurements(1573K,5h) of the plasma-sprayed coatings showed that lower sintering rate for LC coatings with 5mass%-10mass% YSZ doped, shrinkage rate decreased from 0.59%(LC coating) to 0.1~0.25%(5mass%-10mass% doped).
- Copyright
- © 2016, the Authors. Published by Atlantis Press.
- Open Access
- This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
Cite this article
TY - CONF AU - Qing He AU - Hongfeng Yan AU - Yufen Lv AU - Han Zou AU - Ruijun Wang AU - Weiping Wang PY - 2016/05 DA - 2016/05 TI - Effects of 7YSZ doping on properties of lanthanum cerate coatings BT - Proceedings of the 2016 International Forum on Energy, Environment and Sustainable Development PB - Atlantis Press SP - 581 EP - 585 SN - 2352-5401 UR - https://doi.org/10.2991/ifeesd-16.2016.105 DO - 10.2991/ifeesd-16.2016.105 ID - He2016/05 ER -