Title

Effect of trivalent rare earth dopants in nanocrystalline ceria coatings for high-temperature oxidation resistance

Authors

Authors

R. Thanneeru; S. Patil; S. Deshpande;S. Seal

Comments

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Abbreviated Journal Title

Acta Mater.

Keywords

stainless steel; nanocrystalline materials; oxidation; vacancies; ceria; ION MASS-SPECTROMETRY; SOL-GEL COATINGS; OXIDE-FILMS; REACTIVE ELEMENTS; NICKEL OXIDATION; STAINLESS-STEEL; NANO-PARTICLES; ALLOYS; BEHAVIOR; DIFFUSION; Materials Science, Multidisciplinary; Metallurgy & Metallurgical; Engineering

Abstract

Nanocrystalline ceria (NC) and La3+-doped nanocrystalline ceria (LDN) particles synthesized by the micro-emulsion method were coated onto AISI 304 stainless steel (SS) in order to study their high-temperature oxidation resistance properties at 1243 K in dry air for 24 h. Results were compared with those for micro-ceria (MC) coatings. The coated samples showed 90% improvement in oxidation resistance compared to uncoated and MC coated steels as seen from SEM cross-sectional studies. X-ray diffraction (XRD) analysis showed the presence of chromia in both NC and 20 LDN (NC doped with 20 at.% La3+) samples which is absent in uncoated steels. From secondary ion mass spectrometry (SIMS) depth profiles, Fe, Ni depletion zones were observed in LDN-coated samples, indicating diffusion through the oxide layer. The role of oxygen vacancies in the nanoceria coatings on the formation of protective chromia layers is discussed. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Journal Title

Acta Materialia

Volume

55

Issue/Number

10

Publication Date

1-1-2007

Document Type

Article

Language

English

First Page

3457

Last Page

3466

WOS Identifier

WOS:000246956600016

ISSN

1359-6454

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