Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1471015 | Corrosion Science | 2010 | 7 Pages |
Abstract
Oxide dispersed (OD) β-NiAl coatings and OD-free β-NiAl coatings were deposited onto a Hf-containing Ni-based superalloy by electron beam physical vapor deposition (EB-PVD). Excessive enrichment of Hf was found in the TGO on the OD-free coating due to outward diffusion of Hf from the superalloy, causing accelerated TGO thickening and spalling. The OD-coating effectively prevented Hf from outward diffusion. Only small amount of Hf diffused to the coating surface and improved the TGO adherence by virtue of the reactive element effect. The OD-coating exhibited an improved oxidation resistance as compared to the OD-free coating.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Hongbo Guo, Yongjing Cui, Hui Peng, Shengkai Gong,