Microstructural comparison of the isothermal oxidation performance of an
experimental Ni-5Cr-15Al overlay coating applied to CMSX-4 and CMSX-486 was
performed at 1100 ℃. High temperature oxidation was carried out in a box furnace for a
maximum duration of 192 hrs. Samples were periodically removed and the oxide, coating
and substrates microstructurally analyzed using SEM, EDS and XRD equipment. Uncoated
CMSX-4 and CMSX-486 were also oxidized using the same conditions in an
attempt to understand how the coating affected oxidation performance based on
microstructural changes. Results show that both CMSX-4 and CMSX-486 have
unacceptable oxidation characteristics in the un-coated condition, where CMSX-486 had
significantly better performance than CMSX-4. However, in the coated condition, both
CMSX-4 and CMSX-486 had no significant difference in oxidation performance. It was
found, in the un-coated and coated conditions, that the role of Hf in CMSX-486 played a
significant role in determining oxidation performance of the material.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:MWU.1993/16680 |
| Date | 21 February 2013 |
| Creators | Smith, Mathew |
| Contributors | Ojo, Olanrewaju (Mechanical and Manufacturing Engineering) Deng, Chuang (Mechanical and Manufacturing Engineering), Telichev, Igor (Mechanical and Manufacturing Engineering) Lin, Francis (Physics and Astronomy) |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Detected Language | English |
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