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HIGH TEMPERATURE OXIDATION BEHAVIOR OF A (MCrAlY+AlSiY) COMPOSITE COATING |
PENG Xin1;2; JIANG Sumeng1; DUAN Xuhai2; GONG Jun1; SUN Chao1 |
1 State Key Laboratory for Corrosion and Protection; Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016
2 Shenyang Liming Aero--Engine (Group) Co.; Ltd.; AVIC I; Shenyang 110043 |
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Cite this article:
PENG Xin JIANG Sumeng DUAN Xuhai GONG Jun SUN Chao. HIGH TEMPERATURE OXIDATION BEHAVIOR OF A (MCrAlY+AlSiY) COMPOSITE COATING. Acta Metall Sin, 2009, 45(3): 378-384.
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Abstract A composite coating (MCrAlY+AlSiY) was prepared on a Ni--based superalloy K465 by arc ion plating technique. The oxidation behaviors of the composite coating and the reference coating NiCoCrAlYSiB were investigated. The results show that the outer layer of composite coating consists of β--(Ni, Co)Al and dispersed σ--NiCoCr and Cr3Si, and the inner layer of composite coating consists of Cr--rich phases and minor β--(Ni, Co)Al after vacuum annealing at 1050 ℃. Because of the excessive consumption of Al, the spinels and NiO are formed on the surface of the reference coating. For the composite coating, the protective alumina scale is continuous and dense. The enhanced oxidation resistance of the composite coating is related to the gradient distributions of Al--enriched outer layer and Cr--enriched inner layer.
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Received: 29 August 2008
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