|
| Oxidation Behaviour of Al-Si Coating after Diffusion under Different Conditions |
| Received:November 01, 2018 Revised:January 25, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2019.01.006 |
| KeyWord:Al-Si coating oxidation SEM EDS |
| Author | Institution |
| CHEN Zhong |
AECC Guiyang Precision Casting Company, Guiyang , China |
| MENG Cai-si |
AECC Guiyang Precision Casting Company, Guiyang , China |
| HUO Ke-li |
AECC Guiyang Precision Casting Company, Guiyang , China |
| ZHANG Yao |
AECC Guiyang Precision Casting Company, Guiyang , China |
| HAO Fen-li |
AECC Guiyang Precision Casting Company, Guiyang , China |
|
| Hits: |
| Download times: |
| Abstract: |
| Objective To improve the oxidation resistance of Al-Si coating. Methods Al-Si protective coatings were prepared on the gas flowing surface of directional freezing DZ417G Ni-superalloy blade by slurry method. The surface microstructure and cross-sectional microstructure of the coatings were analyzed by scanning electron microscopy (SEM). Results In the diffusion process of Al-Si coating without protective atmosphere, the porous and non-dense phase of θ-Al2O3 was formed firstly. With the oxidation process proceeding, θ-Al2O3 phase gradually transformed into dense structure of α-Al2O3 phase, which had the real oxidation resistance. Conclusion The Al element in the Al-Si coating is consumed in advance, which has certain influence on the service life of the Al-Si coating. Therefore, diffusion process after infiltration must be carried out in vacuum or in protective atmosphere. Then the Al concentration can meet requirement and α-Al2O3 phase can form in the application process for oxidation resistance and thus improve the service life of the blade. |
| Close |
|
|
|