Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5439889 | Corrosion Science | 2017 | 12 Pages |
Abstract
Oxidation behavior of a Ta-containing nanocrystalline coating with different contents of Y and Al on the N5 single-crystal superalloy is investigated at 1050 and 1150 °C. Results indicate that the refractory element, Ta, is very active during oxidation. It diffuses easily from the interior of the nanocrystalline coating to the interface of coating/scale in the form of γâ²-Ni3(Al, Ta), where it is oxidized and ruins the compactness of oxide scale. Adding moderate amount of Y retards the movement and oxidation of Ta, thus increases oxidation resistance. Such retarding effect is strengthened by increasing Al content, while weakened by increasing temperature.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Lanlan Yang, Minghui Chen, Jinlong Wang, Zebin Bao, Shenglong Zhu, Fuhui Wang,