High temperature oxidation behavior of a sputtered NiCrAlY coating with aluminizing

J Chin Soc Corr Pro

2006, Vol. 26

Issue (6): 365-370 DOI:

Research Report

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High temperature oxidation behavior of a sputtered NiCrAlY coating with aluminizing

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辽宁工程技术大学材料系

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Abstract A nanocrystalline Ni-30Cr-8Al-0.5Y coating was deposited on a Ni-base superalloy by magnetron sputtering. Post-aluminizing was performed on the sputtered coating to improve the corresponding high-temperature oxidation resistance. The isothermal oxidation behaviors of the sputtered coating with and without aluminizing at 1000℃-1100℃ have been investigated using TGA, SEM/EDS, XRD and EPMA, respectively. The results indicated that the sputtered NiCrAlY coating possessed excellent oxidation resistance at 1000℃. Because of the excessive consumption of Al in the coating, it lost protective ability at 1100℃. The mass gain of the aluminized NiCrAlY coating was a little higher than that of the sputtered coating due to the formation of the rapid growthθ－Al2O3 phase at 1000℃. At 1100℃ the oxidation resistance of the latter was better than that of the former as a result of the formation of a continuous and protective Al2O3 scale.

Key words: oxidation sputtered coating aluminizing

Received: 18 July 2005

ZTFLH:

TG174.4

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. High temperature oxidation behavior of a sputtered NiCrAlY coating with aluminizing. J Chin Soc Corr Pro, 2006, 26(6): 365-370 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2006/V26/I6/365

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