Formation of discontinuous Al_2O_3 layers during high-temperature oxidation of RuAl alloys
Formation of discontinuous Al_2O_3 layers during high-temperature oxidation of RuAl alloys
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DOI：
10.1557/jmr.2006.0028
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发表时间：
2006-01
影响因子：
2.7
通讯作者：
P. Bellina;A. Catanoiu;Francisco M. Morales;M. Rühle
中科院分区：
文献类型：
--
作者：
P. Bellina;A. Catanoiu;Francisco M. Morales;M. Rühle
粘结涂层在热障涂层系统的性能中起着至关重要的作用。Ru合金已被确定为有前途的候选者;因此，对块体RuAl（50-50 at.%）的氧化行为进行了系统的研究。在1100 °C下进行等温氧化和热重分析，持续0.1 h至500 h的不同时间。通过扫描和透射电子显微镜进行微观结构表征。结果表明，在δ-Ru层上形成了α-Al_2O_3层。界面的不稳定性和气态Ru氧化物的蒸发导致了大的细长空洞和α-Al_2O_3/δ-Ru交替层的形成。
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 °C for different times ranging from 0.1 h to 500 h. Microstructural characterization was performed by scanning and transmission electron microscopy. The results showed the formation of an α–Al_2O_3 layer on top of a δ–Ru layer. Interface instability between these layers and evaporation of gaseous Ru-oxides lead to the formation of large elongated cavities and alternating α–Al_2O_3/δ–Ru layers.