Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5440173 | Corrosion Science | 2017 | 11 Pages |
Abstract
The high-temperature oxidation of Co-based oxide dispersion strengthened (ODS) Co-20Cr-(5, 10) Al-2.4Hf-1.5Y2O3 (wt%) superalloys was investigated at 900 °C and 1000 °C. The 10Al (wt%) superalloys possess better oxidation resistance with the formation of alumina scale than the 5Al (wt%) with a duplex scale of CoCr2O4/Cr2O3 and internal Al2O3. The alumina on the 10Al superalloy is composed of θ- and α-alumina at 900 °C but dominated by α-alumina at 1000 °C. The lower weight gain of 10Al superalloys at 1000 °C than at 900 °C was associated with different growth mechanisms of the Al2O3 scales.
Related Topics
Physical Sciences and Engineering
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Ceramics and Composites
Authors
Hao Yu, Shigeharu Ukai, Shigenari Hayashi, Naoko Oono,