Formation of discontinuous Al2O3 layers during high-temperature oxidation of RuAl alloysy

被引：25

作者：

Bellina, PJ ^{[1
]}

Catanoiu, A ^{[1
]}

Morales, FM ^{[1
]}

Rühle, M ^{[1
]}

机构：

[1] Max Planck Inst Met Res, D-70569 Stuttgart, Germany

来源：

JOURNAL OF MATERIALS RESEARCH | 2006年 / 21卷 / 01期

关键词：

D O I：

10.1557/JMR.2006.0028

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Bond coats play a crucial role in the performance of thermal barrier coating systems. Ru alloys have been identified as promising candidates; therefore, systematic studies were performed on the oxidation behavior of bulk RuAl (50-50 at.%). Isothermal oxidation and thermogravimetric analyses were performed at 1100 degrees C for different times ranging from 0.1 h to 500 It. Microstructural characterization was performed by scanning and transmission electron microscopy. The results showed the formation of an alpha-Al2O3 layer on top of a delta-Ru layer. Interface instability between these layers and evaporation of gaseous Ru-oxides lead to the formation of large elongated cavities and alternating alpha-Al2O3/delta-Ru layers.

引用

页码：276 / 286

页数：11

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