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Title: The effects of surface-applied oxide films containing varying amounts of yttria, chromia, or alumina on the high-temperature oxidation behavior of chromia-forming and alumina-forming alloys

Abstract

In order to study the effects on oxidation behavior of changing the composition of oxide scales without changing the composition of the underlying alloys, thin films, which contained various amounts of Y{sub 2}O{sub 3}, Cr{sub 2}O{sub 3}, or Al{sub 2}O{sub 3} have been deposited on Fe-25%Cr and Fe-25%Cr-5%Al prior to oxidation. There were major differences between the (Fe-25%Cr)-(Cr{sub 2}O{sub 3}-Y{sub 2}O{sub 3}) and (Fe-25%Cr-5%Al)-(Al{sub 2}O{sub 3}-Y{sub 2}O{sub 3}) systems. A film of Cr{sub 2}O{sub 3} on Fe-25%Cr reduced the oxidation rate and Cr{sub 2}O{sub 3}-Y{sub 2}O{sub 3} films reduced it still further. A film of Al{sub 2}O{sub 3} on Fe-25%Cr-5%Al reduced the rate considerably, but Al{sub 2}O{sub 3}-Y{sub 2}O{sub 3} films exhibited rates that were greater than those for Al{sub 2}O{sub 3} alone. A film, which consisted entirely of Y{sub 2}O{sub 3}, greatly decreased the oxidation rate of Fe-25%Cr, but increased that of Fe-25%Cr-5%Al. The changes in oxidation rate produced by Y{sub 2}O{sub 3} in the (Fe-25%Cr)-(Cr{sub 2}O{sub 3}-Y{sub 2}O{sub 3}) system were much greater than those produced in the (Fe-25%Cr-5%Al)-(Al{sub 2}O{sub 3}-Y{sub 2}O{sub 3}) system. As far as oxidation rate is concerned, the optimum amount of Y{sub 2}O{sub 3} in the (Fe-25%Cr)-(Cr{sub 2}O{sub 3}-Y{sub 2}O{sub 3}) system was foundmore » to be greater than or equal to 40% and less than 100%; in the Fe-25%Cr-5%Al-(Al{sub 2}O{sub 3}-Y{sub 2}O{sub 3}) system it was approximately 10%. In thermal-cycling tests, the results for the (Fe-25%Cr)-(Cr{sub 2}O{sub 3}-Y{sub 2}O{sub 3}) system followed the same pattern as that for the isothermal tests; a film of Y{sub 2}O{sub 3} reduced the oxidation rate and a film of Cr{sub 2}O{sub 3}-33%Y{sub 2}O{sub 3} reduced it still further.« less

Authors:
;
Publication Date:
Research Org.:
Univ. of Science and Technology, Beijing (CN)
OSTI Identifier:
20050530
Resource Type:
Journal Article
Journal Name:
Oxidation of Metals
Additional Journal Information:
Journal Volume: 53; Journal Issue: 5-6; Other Information: PBD: Jun 2000; Journal ID: ISSN 0030-770X
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; OXIDATION; IRON ALLOYS; CHROMIUM ALLOYS; ALUMINIUM ALLOYS; SCALING; THIN FILMS; OXIDES; YTTRIUM ADDITIONS; CHROMIUM OXIDES; ALUMINIUM OXIDES

Citation Formats

Qi, H.B., and Lees, D.G. The effects of surface-applied oxide films containing varying amounts of yttria, chromia, or alumina on the high-temperature oxidation behavior of chromia-forming and alumina-forming alloys. United States: N. p., 2000. Web. doi:10.1023/A:1004633026323.
Qi, H.B., & Lees, D.G. The effects of surface-applied oxide films containing varying amounts of yttria, chromia, or alumina on the high-temperature oxidation behavior of chromia-forming and alumina-forming alloys. United States. doi:10.1023/A:1004633026323.
Qi, H.B., and Lees, D.G. Thu . "The effects of surface-applied oxide films containing varying amounts of yttria, chromia, or alumina on the high-temperature oxidation behavior of chromia-forming and alumina-forming alloys". United States. doi:10.1023/A:1004633026323.
@article{osti_20050530,
title = {The effects of surface-applied oxide films containing varying amounts of yttria, chromia, or alumina on the high-temperature oxidation behavior of chromia-forming and alumina-forming alloys},
author = {Qi, H.B. and Lees, D.G.},
abstractNote = {In order to study the effects on oxidation behavior of changing the composition of oxide scales without changing the composition of the underlying alloys, thin films, which contained various amounts of Y{sub 2}O{sub 3}, Cr{sub 2}O{sub 3}, or Al{sub 2}O{sub 3} have been deposited on Fe-25%Cr and Fe-25%Cr-5%Al prior to oxidation. There were major differences between the (Fe-25%Cr)-(Cr{sub 2}O{sub 3}-Y{sub 2}O{sub 3}) and (Fe-25%Cr-5%Al)-(Al{sub 2}O{sub 3}-Y{sub 2}O{sub 3}) systems. A film of Cr{sub 2}O{sub 3} on Fe-25%Cr reduced the oxidation rate and Cr{sub 2}O{sub 3}-Y{sub 2}O{sub 3} films reduced it still further. A film of Al{sub 2}O{sub 3} on Fe-25%Cr-5%Al reduced the rate considerably, but Al{sub 2}O{sub 3}-Y{sub 2}O{sub 3} films exhibited rates that were greater than those for Al{sub 2}O{sub 3} alone. A film, which consisted entirely of Y{sub 2}O{sub 3}, greatly decreased the oxidation rate of Fe-25%Cr, but increased that of Fe-25%Cr-5%Al. The changes in oxidation rate produced by Y{sub 2}O{sub 3} in the (Fe-25%Cr)-(Cr{sub 2}O{sub 3}-Y{sub 2}O{sub 3}) system were much greater than those produced in the (Fe-25%Cr-5%Al)-(Al{sub 2}O{sub 3}-Y{sub 2}O{sub 3}) system. As far as oxidation rate is concerned, the optimum amount of Y{sub 2}O{sub 3} in the (Fe-25%Cr)-(Cr{sub 2}O{sub 3}-Y{sub 2}O{sub 3}) system was found to be greater than or equal to 40% and less than 100%; in the Fe-25%Cr-5%Al-(Al{sub 2}O{sub 3}-Y{sub 2}O{sub 3}) system it was approximately 10%. In thermal-cycling tests, the results for the (Fe-25%Cr)-(Cr{sub 2}O{sub 3}-Y{sub 2}O{sub 3}) system followed the same pattern as that for the isothermal tests; a film of Y{sub 2}O{sub 3} reduced the oxidation rate and a film of Cr{sub 2}O{sub 3}-33%Y{sub 2}O{sub 3} reduced it still further.},
doi = {10.1023/A:1004633026323},
journal = {Oxidation of Metals},
issn = {0030-770X},
number = 5-6,
volume = 53,
place = {United States},
year = {2000},
month = {6}
}