Application of Plasma-Sprayed Complex Perovskites as Thermal Barrier Coatings

被引：85

作者：

Jarligo, Maria Ophelia ^{[1
]}

Mack, Daniel Emil ^{[1
]}

Vassen, Robert ^{[1
]}

Stover, Detlev ^{[1
]}

机构：

[1] Forschungszentrum Julich GmbH, Inst Energieforsch IEF1, D-52425 Julich, Germany

来源：

JOURNAL OF THERMAL SPRAY TECHNOLOGY | 2009年 / 18卷 / 02期

关键词：

atmospheric plasma spraying; coating properties; complex perovskite; thermal barrier coating (TBC); thermal cycling; CONDUCTIVITY; ZIRCONATE; CERAMICS; OXIDES;

D O I：

10.1007/s11666-009-9302-9

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In an effort to improve the performance of heat engines at high temperatures, advanced surface coatings have been developed from complex perovskites. Materials of Ba(Mg1/3Ta2/3)O-3 and La(Al1/4Mg1/2Ta1/4)O-3 composition were synthesized and applied as ceramic topcoats of thermal barrier coating (TBC) systems by atmospheric plasma spraying (APS) in single layer and in double-layer combination with conventional yttria stabilized zirconia (YSZ). Microstructural and phase analyses reveal that plasma spraying of complex perovskites is accompanied with the formation of vertical crack networks and secondary oxide phases which influence the failure mechanism of the TBCs. The low value of fracture toughness for the complex perovskites and the thermally grown oxide at the topcoat-bondcoat interface of the TBCs are, however, the major factors which lead to the coating failure on thermal cycling at about 1250 A degrees C.

引用

页码：187 / 193

页数：7

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