Failure of the plasma-sprayed coating of lanthanum hexaluminate

被引：181

作者：

Cao, X. Q. ^{[1
]}

Zhang, Y. F. ^{[1
,2
]}

Zhang, J. F. ^{[1
,2
]}

Zhong, X. H. ^{[1
,2
]}

Wang, Y. ^{[1
]}

Ma, H. M. ^{[1
]}

Xu, Z. H. ^{[1
,2
,3
]}

He, L. M. ^{[3
]}

Lu, F. ^{[3
]}

机构：

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

[2] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China

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

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2008年 / 28卷 / 10期

关键词：

lanthanum magnesium hexaluminate; plasma spraying; phase stability; thermal barrier coatings;

D O I：

10.1016/j.jeurceramsoc.2008.01.023

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 [材料科学与工程]; 080502 [材料学];

摘要：

Lanthanum magnesium hexaluminate (LaMgAl11O19, LMA) is an attractive material for thermal barrier coatings (TBCs), and the failure of its coating was studied in this work by thermal cycling, X-ray diffraction, dilatometric measurement and thermal gravimetric-differential thermal analysis. The dilatometric measurement indicates that even though the bulk material of LMA has a higher sintering-resistance than the typical TBC material, i.e. yttria-stabilized zirconia (YSZ), the plasma sprayed coating of LMA has two serious contractions due to the re-crystallization of LMA and phase transitions of alumina. LMA has similar thermal expansion behaviour with alumina, leading to a good thermal expansion match between LMA and the thermally grown oxide layer. On the other hand, the plate-like structure of LMA not only results in a low thermal conductivity, low Young's modulus, but also a high stress tolerance, and these are believed to be the reasons for the long thermal cycling life of LMA coating. (c) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1979 / 1986

页数：8

共 35 条

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