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首页> 外文期刊>Journal of Materials Research >Formation of discontinuous Al_2O_3 layers during high-temperature oxidation of RuAl alloys
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Formation of discontinuous Al_2O_3 layers during high-temperature oxidation of RuAl alloys

机译：RuAl合金高温氧化过程中不连续Al_2O_3层的形成

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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. percent). Isothermal oxidation and thermogravimetric analyses were performed at 1100 deg 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 alpha-Al_2O_3 layer on top of a 8-Ru layer. Interface instability between these layers and evaporation of gaseous Ru-oxides lead to the formation of large elongated cavities and alternating alpha-Al_2O_3/delta-Ru layers.
机译：粘合涂层在隔热涂层系统的性能中起着至关重要的作用。钌合金已被确定为有前途的候选材料。因此，对块状RuAl（50-50 at。％）的氧化行为进行了系统的研究。在1100摄氏度下进行等温氧化和热重分析，时间从0.1小时到500小时不等。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8-Ru层的顶部形成了alpha-Al_2O_3层。这些层之间的界面不稳定性和气态Ru-氧化物的蒸发导致形成大的细长腔和交替的α-Al_2O_3/δ-Ru层。

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