Microstructure and Oxidation Behavior of Modified Aluminide Coating on Ni3Al-based Single Crystal Superalloy |
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Authors: | YANG Ruibo WU Yuxiao WU Qiong LI Shusuo MA Yue GONG Shengkai |
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Institution: | School of Materials Science and Engineering, Beihang University, Beijing 100191, China |
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Abstract: | Al, Al-Si and Cr-Al-Si coatings are prepared onto IC20 alloy by powder pack cementation to improve the oxidation resistance of the alloy. The isothermal oxidation behaviors of the coatings and the uncoated IC20 alloy at 1 100 °C are comparatively investigated. For the coatings, less weight gains are obtained compared to the uncoated alloy after 100 h thermal exposure. The Al-Si coating exhibits the best oxidation resistance, while the addition of Cr accelerates the scale spallation. Phase transformation from β-NiAl to γ and γ′ occurs in the coating after oxidation for extended periods. The oxidation protection and degradation mechanisms for these coatings are discussed. |
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Keywords: | superalloys coatings powder pack cementation microstructure oxidation resistance |
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