Opportunities for improved TBC durability in the CeO2-TiO2-ZrO2 system

被引：31

作者：

Krogstad, Jessica A. ^{[1
]}

Lepple, Maren ^{[1
,2
,3
]}

Levi, Carlos G. ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

[2] Univ Stuttgart, Inst Mat Sci, D-70174 Stuttgart, Germany

[3] MPI Intelligent Syst, Stuttgart, Germany

来源：

SURFACE & COATINGS TECHNOLOGY | 2013年 / 221卷

基金：

美国国家科学基金会;

关键词：

Thermal barrier coatings; Zirconia; Toughness; Ferroelastic switching; X-RAY-ABSORPTION; ZIRCONIA STABILIZATION; PHASE-STABILITY; TOUGHNESS; DOPANTS; MECHANISM; DIAGRAM;

D O I：

10.1016/j.surfcoat.2013.01.026

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A previously unreported, relatively large single-phase tetragonal field with exceptional tetragonality has been stabilized up to at least 1350 degrees C by co-doping zirconia (ZrO2) with ceria (CeO2) and titania (TiO2). The tetragonality is believed to be responsible for an increase in micro-indentation toughness, relative to traditional 7YSZ, based on activation of ferroelastic domain switching. Evidence consistent with this toughening mechanism has been directly observed via transmission electron microscopy (TEM). Within grains >5 mu m, long-range anion order is induced within elastically switched domains. This observation provides additional insight on the toughening mechanism. In the absence of stoichiometric anion vacancies, the large non-transformable tetragonal composition range and the improved toughness suggest that this system could be a promising option for next generation thermal barrier coatings. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：44 / 52

页数：9

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