| YANG Ying-fei,REN Pan,BAO Ze-bin,ZHU Sheng-long,WANG Fu-hui,LI Wei.Isothermal Oxidation of Four Typical High-temperature Protective Coatings[J],49(1):49-55 |
| Isothermal Oxidation of Four Typical High-temperature Protective Coatings |
| Received:October 28, 2019 Revised:January 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.01.006 |
| KeyWord:high temperature oxidation protective coatings SEM failure mechanism |
| Author | Institution |
| YANG Ying-fei |
1.Jinan University, Guangzhou , China |
| REN Pan |
1.Jinan University, Guangzhou , China |
| BAO Ze-bin |
2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China |
| ZHU Sheng-long |
2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China |
| WANG Fu-hui |
3.Northeastern University, Shenyang , China |
| LI Wei |
1.Jinan University, Guangzhou , China |
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| Abstract: |
| The work aims to evaluate the isothermal oxidation resistance of typical high-temperature protective coating systematically and analyze their failure mechanism. Isothermal oxidation performance of plain NiAl, NiCrAlY, Pt modified NiAl and Pt+Hf co-modified NiAl were compared at 1100 ℃. Isothermal resistance and failure mechanisms of four typical coatings were analyzed in terms of the mass gain and microstructure evolution during the oxidation test. The mass gain of four coatings during oxidation 1100 ℃ conformed to the parabolic laws. Plain NiAl coating degenerated fastest due to the poor adherence of oxide scale. The oxide scale adherence for NiCrAlY was satisfactory due to the formation of oxide “tags” by the existence of Y, but it almost lost the protection ability completely after 300 h exposure due to the lower Al content in the coating. Pt modified NiAl displayed integrated oxidation resistance, but had the serious rumpling. In contrast, the oxide of Pt+Hf co-modified NiAl was uniformly and kept stable during the exposure and manifested the best oxidation resistance. The oxidation resistance of the four typical high-temperature coatings can be ranked as: Pt+Hf co-modified NiAl > Pt modified NiAl > plain NiAl > NiCrAlY. |
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