Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 18    No. 2    April 2008

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Effect of Y2O3 on microstructure and oxidation of -Ni+ ′-Ni3Al coatings transformed from electrodepositedNi-Al films at 1 000 ℃
ZHOU Yue-bo(周月波), ZHANG Hai-jun(张海军), WANG Zhen-ting(王振廷)

College of Materials Science and Engineering, Heilongjiang Institute of Science and Technology,Harbin 150027, China

Abstract:The electrodeposited Y2O3-dispersed -Ni+ -Ni3Al coatings on Ni substrates were developed by the conversion of electrodeposited Ni-Al-Y2O3 films with dispersed Al microparticles in Ni matrix into Ni3Al by vacuum annealing at 800 ℃ for 3 h. For comparison, Y2O3-free -Ni+ ′-Ni3Al coatings with a similar Al content were also prepared by vacuum annealing the electrodeposited microparticle-dispersed composite coatings of Ni-Al under the same condition. SEM and TEM characterizations show that the electrodeposited Y2O3-dispersed + ′ coatings exhibit finer grains, a more homogeneous distribution of  ′, and a narrowed  ′ phase spacing compared with the electrodeposited Y2O3-free + ′ coatings. The oxidation at 1 000 ℃ shows that the addition of Y2O3 significantly improves the oxidation resistance of the electrodeposited + ′coatings. The effect of Y2O3 particles on the microstructure and oxidation behavior of the electrodeposited + ′ coatings was discussed in detail.


Key words: electrodeposition; -Ni+′-Ni3Al coatings; vacuum annealing; oxidation

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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