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Permanent link (DOI): https://doi.org/10.7939/R34X59

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Effects of Oxide Additions on the Corrosion Behaviour of Cr2O3 Based Ceramics in High Temperature Supercritical Water Environment Open Access

Descriptions

Other title
Subject/Keyword
corrosion
supercritical water
Cr2O3
ceramics
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Wang, Renfei
Supervisor and department
Luo, Jingli (Chemical and Materials Engineering)
Chen, Weixing (Chemical and Materials Engineering)
Examining committee member and department
Luo, Jingli (Chemical and Materials Engineering)
Chen, Weixing (Chemical and Materials Engineering)
Xia, Zihui (Mechanical Engineerig)
Department
Department of Chemical and Materials Engineering
Specialization

Date accepted
2012-09-27T14:28:54Z
Graduation date
2012-09
Degree
Master of Science
Degree level
Master's
Abstract
This investigation is aimed at developing ceramic materials applied in supercritical water, which is being considered as coolant for one of the next generation nuclear reactors. Cr2O3, a primary protective film on stainless steels, was found to be unstable in SCW due to the formation of soluble Cr6+ species, which can be severed by increasing the oxygen content in SCW or by reducing the ceramic’s grain size. To enhance the stability of Cr2O3 in SCW, various amounts of other oxides including MgO, CeO2 and SiO2 additives were added into Cr2O3 and these ceramics were exposed to an SCW environment at 650°C/25 MPa for up to 600 hours. The results showed that adding a proper amount (less than 5 wt. %) of CeO2 and MgO into Cr2O3 can increase the corrosion resistance of Cr2O3 based ceramics in SCW environments, whereas high additions content can deteriorate the stability of Cr2O3 based ceramics.
Language
English
DOI
doi:10.7939/R34X59
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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