Effects of deposition conditions on composition and thermal cycling life of lanthanum zirconate coatings

被引：30

作者：

Xu, Zhenhua ^{[1
,2
,3
]}

Zhong, Xinghua ^{[1
,2
]}

Zhang, Jiangfeng ^{[1
,2
]}

Zhang, Yanfei ^{[1
,2
]}

Cao, Xueqiang ^{[1
]}

He, Limin ^{[3
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Rare Earths Adv Mat & Valuable Util, Changchun 130022, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

[3] Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China

来源：

SURFACE & COATINGS TECHNOLOGY | 2008年 / 202卷 / 19期

关键词：

lanthanum zirconate; thermal barrier coatings; EB-PVD; thermal cycling;

D O I：

10.1016/j.surfcoat.2008.04.046

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Lanthanum, zirconate (La2Zr2O7, LZ) coatings were prepared under four different deposition conditions by electron beam-physical vapor deposition (EB-PVD). The composition, crystal structure, surface and cross-sectional morphology, cyclic oxidation behavior of these coatings were studied. Elemental analysis indicates that the coating composition has partially deviated from the stoichiometry of pyrochlore, and the existence of excess La2O3 is also observed. The deviation could be reduced by properly controlling the electron beam current or by changing the ingot composition. Meanwhile, when the electron beam current was 500-600 mA, the thermal cycling life of the coating is superior to other coatings. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：4714 / 4720

页数：7

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