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| HREM STUDY OF OXIDATION BEHAVIOR OF NiAl TYPE CoMPoSITE COATING WITH DISPERSIVE La_2O_3 PARTICLES |
| Li Tiefan~1; Yu Yinda~2; Peng Xiao; Xu Shuhua; Ma Xinqing; Guan Ruonan~2 and Li Rishen~2 1(Corrosion Science Laboratory; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences) 2(Laboratory of Atomic Imaging of Solids; Institute of M |
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Abstract β-NiAl type composite coating with dispersive La_2O_3 particles was prepared by electrodeposition of Ni-La_2O_3 composite on M38 superalloy followed by aluminizing. The fine structure of the coating and its oxide scale was studied by means of highresolution electron microscope(HREM) for the first time. It was found that La_2O_3 particles were distributed in β-NiAl phases of the coating, and that after oxidation at 1273K for 25 hours dispersive or agglomerative La_2O_3 particles with a diameter of 10～50nm were incorporated into the α-Al_2O_3 scale. In addition, an intermediate layer located at the α-Al_2O_3/β-NiAl interface was also observed. The superior oxidation resistance of the coating is believed to be related to effect of La_2O_3 dispersoids on growth mechanism of the oxide scale. A sufficient amount of La_2O_3 dispersoids existing in the vicinity of the oxide/coating interface would act as a barrier blocking the bulk diffusion of Al~(3+) ions which tends to reduce the growth rate of the scale and to improve the oxide scale adhesion. The intermediate layer observed may contribute a beneficial effect to stability of the interface.
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Received: 25 August 1992
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Cite this article:
Li Tiefan~1; Yu Yinda~2; Peng Xiao; Xu Shuhua; Ma Xinqing; Guan Ruonan~2 and Li Rishen~2 1(Corrosion Science Laboratory; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences) 2(Laboratory of Atomic Imaging of Solids; Institute of M. HREM STUDY OF OXIDATION BEHAVIOR OF NiAl TYPE CoMPoSITE COATING WITH DISPERSIVE La_2O_3 PARTICLES. J Chin Soc Corr Pro, 1992, 12(4): 284-290.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1992/V12/I4/284
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