| LI Yan-ming 1 ，LI Zhong-sheng 2 ,LIU Huan 1 ，BU Jia-li 1 ，ZHANG Kai-kuo 1 ，HAN Zhen-yu 1.Research on High Temperature Oxidation Resistance of Co-Al Coatings on Ni-based Superalloy[J].航空发动机,2023,49(1):169-174 |
| Research on High Temperature Oxidation Resistance of Co-Al Coatings on Ni-based Superalloy |
| DOI： |
| Key Words:Ni-based superalloy Co-Al coatings high temperature oxidation Al 2 O 3 protective film aeroengine |
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| Abstract:In order to study the high temperature oxidation resistance of Co-Al coating on the surface of Ni-based superalloy，high
temperature oxidation tests were carried out at 800，900 and 1000 ℃ for 200 hours，and their oxidation behavior were analyzed metallo?
graphically by scanning electron microscopy (SEM)，energy disperse spectroscopy (EDS) and X-ray diffraction (XRD). The results show that
the oxidation kinetics curves of the Co-Al coatings basically obey the parabolic law and the oxidation activation energy was 78185 kJ/mol.
The mass addition of Co-Al coating was relatively slow as well as the average oxidation rate. Uniform and dense film of oxidation products,
which were mainly composed of Al 2 O 3 ，was formed on the surface of the specimen. The continuous and dense protective film effectively pre?
vents the outward diffusion of Al to the coating-air interface and the inward diffusion of O to the coating-substrate interface, the Co-Al
coating exhibits excellent high temperature oxidation resistance at three temperatures. |
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