Rare earth oxide gel coatings for improved H.T. oxidation resistance of iron-chromium alloys
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2008
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INTERNATIONAL CONFERENCE ON AEROSPACE SCIENCE AND TECHNOLOGY
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Resumo
Rare earths (RE) have been used to improve the high temperature oxidation resistance of
chromium dioxide and alumina forming alloys. The RE are added either to the alloy or are applied as a
coating to the alloy’s surface. In this study, the sol-gel technique was used to prepare RE oxides of La, Ce,
Pd, Nd, Sm, Gd, Dy, Y, Er, and Yb. These oxides were used to coat Fe-20Cr specimens. The cyclic oxidation
resistance of the RE oxide coated specimens was determined. Marked improvements were observed in the
coated specimens and the extent of improvement depended on the nature of the RE oxide, its ionic radius and
other features of the coating. Extended oxidation tests were carried out with La2O3 and Pr2O3 coated Fe-20Cr
alloy. In these tests the specimens were heated to different peak temperatures and cooled at rates of up to
1000ºC/s. The La2O3 coatings were more effective in increasing cyclic oxidation resistance compared to
Pr2O3 coatings. The role of RE in increasing overall oxidation resistance of chromium dioxide forming alloys
is discussed.
Como referenciar
FERNANDES, S.M.C.; RAMANATHAN, L.V. Rare earth oxide gel coatings for improved H.T. oxidation resistance of iron-chromium alloys. In: INTERNATIONAL CONFERENCE ON AEROSPACE SCIENCE AND TECHNOLOGY, June 26-28, 2008, Bangalore, India. Proceedings... Disponível em: http://repositorio.ipen.br/handle/123456789/15967. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.