Abstract
In order to improve the oxidation resistance of high Nb containing TiAl alloys, the microstructure and oxidation behavior of NiCoCrAlY(Mo) coatings were investigated at 900 °C for 100 h by isothermal oxidation tests. The oxidation resistance of TiAlNbCr alloys was significantly improved after adding coatings and the oxidation resistance of NiCoCrAlY coating was slightly better than that of NiCoCrAlYMo coating. A continuous and dense Al 2 O 3 film was formed on the surface of NiCoCrAlY coating. Mo has negative influence on the oxidation resistance of NiCoCrAlY coating. It is found that Mo was oxidized to form MoO 3 , meanwhile the evaporation of MoO 3 resulted in the spallation of oxide film and severe internal oxidation. However, Mo was beneficial to enhance the adhesion between coating and substrate due to the formation of Al 2 O 3 pegs. Elemental interdiffusion at the interface of coating-alloy was inhibited by the MoO 3 and Al 2 O 3 diffusion barriers effectively.
| Original language | English |
|---|---|
| Pages (from-to) | 81-92 |
| Number of pages | 12 |
| Journal | Applied Surface Science |
| Volume | 431 |
| DOIs | |
| State | Published - 15 Feb 2018 |
Keywords
- Mo
- NiCoCrAlY coating
- Oxidation
- Plasma spraying
- TiAlNbCr alloy
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