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The isothermal and cyclic oxidation behaviour of two Co modified aluminide coatings at high temperature |
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| Affiliation: | 1. State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, 149 Yanchang Road, Shanghai 200072, China;2. Central Academe, Shanghai Electric Group Co., Ltd., 960 Zhongxing Road, Shanghai 200070, China;3. Department of Materials Science and Engineering, Iowa State University, Division of Materials Science and Engineering, Ames Laboratory of the U.S.D.O.E., Ames, IA 50011-2300, USA |
| Abstract: | The isothermal and cyclic oxidation behaviour of two Co modified aluminide coatings together with the simple aluminide coating were performed at 1000 °C and 1100 °C. All the three coatings show a much lower oxidation rate compared with the bare alloy. Results also indicate the addition of Co to the aluminide coating decreases the oxidation resistance slightly. It can be ascribed to that Co is easier to be oxidized than Ni at high temperature, and the Cr(W) rich phases which could act as a diffusion barrier are less in the coating with higher Co content. |
| Keywords: | A. Metal coatings A. Superalloys B. SEM B. XRD C. Oxidation |
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