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
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.
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页码:276 / 286
页数:11
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