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/).

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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  -