Thermal cycling failure of new LaMgAl11O19/YSZ double ceramic top coat thermal barrier coating systems

New LaMgAl11O19 (LaMA)/YSZ double ceramic top coat thermal barrier coatings (TBCs) with the potential application in advanced gas-turbines and diesel engines to realize improved efficiency and durability were prepared by plasma spraying, and their thermal cycling failure were investigated. The micro...

Full description

Saved in:
Bibliographic Details
Published in:Surface & coatings technology 2011-02, Vol.205 (10), p.3293-3300
Main Authors: Chen, Xiaolong, Zhao, Yu, Fan, Xizhi, Liu, Yangjia, Zou, Binglin, Wang, Ying, Ma, Hongmei, Cao, Xueqiang
Format: Article
Language:English
Subjects:
Applied sciences
Ceramic coatings
Ceramics
Coating
Coatings
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Failure
Gas turbine engines
Materials science
Metals. Metallurgy
Nonmetallic coatings
Physics
Production techniques
Surface treatment
Surface treatments
Thermal cycling
Yttria stabilized zirconia
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:New LaMgAl11O19 (LaMA)/YSZ double ceramic top coat thermal barrier coatings (TBCs) with the potential application in advanced gas-turbines and diesel engines to realize improved efficiency and durability were prepared by plasma spraying, and their thermal cycling failure were investigated. The microstructure evolutions as well as the crystal chemistry characteristics of LaMA coating which seemed to have strong influences on the thermal cycling failure of LaMA and the new double ceramic top coat TBCs based on LaMA/YSZ system were studied. For double ceramic top coat TBC system, interface modification of LaMA/YSZ by preparing thin composite coatings seemed to be more preferred due to the formations of multiple cracks during thermal cycling making the TBC to be more strain tolerant and as well as resulting in an improved thermal cycling property. The effects of the TGO stresses on the failure behavior of the TBCs were discussed through fluorescence piezo-spectroscopy analysis. a-[ordm The failure of LaMgAl11O19/YSZ double layered TBCs was reported for the first time. a-[ordm The nanocrystallization phenomenon of the LaMA coating was put forward. a-[ordm Single layered TBC may exhibit a life close to the corresponding double layered TBCs.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2010.11.059