In order to develop a robust alumina scale dispersed with nano-oxide particles for FeCrAl oxide dispersion strengthened (ODS) ferritic alloys, the oxidation behavior of FeCrAl ODS ferritic alloys with zirconium and excessive oxygen (Ex. O) additions was investigated at 900 °C in air. Zirconia incorporation into alumina scale was not observed in the Ex. O-added FeCrAl ODS alloys at 900 °C, instead of this, a distribution with dense Y-Zr oxide particles inside the alumina scale was found, which is expected to enhance the stability of the alumina scale during service at elevated temperatures in nuclear applications. Preexisting large Zr-enriched precipitates formed during the alloy fabrication process are incorporated into the alumina scales during oxidation, which would increase the oxidation rate via providing a short-circuit paths for oxygen inward diffusion by themselves and associated porosity. In addition to a traditional spherical shape, a unique tadpole-like shape of the fine Y-Zr oxide particles in alumina was also observed, which is considered to be related to those incorporated coarse Zr-Y oxide inclusions in alumina scale.

为了开发一种分散有纳米氧化物颗粒的坚固耐用的氧化铝鳞片，用于FeCrAl氧化物弥散强化（ODS）铁氧体合金，研究了在900°C下添加了锆和过量氧（Ex。O）的FeCrAl ODS铁氧体合金的氧化行为。在空中。在实施例中未观察到氧化锆掺入氧化铝垢中。在900°C时添加O的FeCrAl ODS合金，取而代之的是，发现在氧化铝鳞片内部分布有致密的Y-Zr氧化物颗粒，这有望增强在核应用中高温下使用过程中氧化铝鳞片的稳定性。 。在合金制造过程中形成的预先存在的大量富Zr沉淀物在氧化过程中被掺入氧化铝鳞片中，通过提供短路路径使氧气本身和相关的孔隙度向内扩散，可以提高氧化速率。除了传统的球形之外，还观察到氧化铝中独特的t状Y-Zr氧化物细颗粒形状，这被认为与那些掺入氧化铝级的粗Zr-Y氧化物夹杂物有关。