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Permanent link (DOI): https://doi.org/10.7939/R32718

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Nanostructured Environmental Barrier Coatings for Corrosion Resistance in Recovery Boilers Open Access

Descriptions

Other title
Subject/Keyword
Environmental Barrier Coating
Recovery Boiler
Nanostructured
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Rao, Shishir
Supervisor and department
Dr. Andre McDonald (Department of Mechanical Engineering)
Examining committee member and department
Dr. John A. Nychka (Department of Chemical and Materials Engineering)
Dr. Sushanta Mitra (Department of Mechanical Engineering)
Department
Department of Mechanical Engineering
Specialization

Date accepted
2011-07-12T17:15:23Z
Graduation date
2011-11
Degree
Master of Science
Degree level
Master's
Abstract
Corrosion of components in a recovery boiler is a major problem faced by the pulp and paper industry. The superheater tubes get severely corroded due to the presence of hot sulphidic gases in the boiler as well as the hot molten salts which get deposited on the surface of the tubes. As a result, the boiler has to be shut down for expensive maintenance and repairs. This thesis examines the possibility of using air plasma sprayed (APS) yttria-stabilized zirconia (YSZ) environmental barrier coatings (EBC) to protect against molten salt corrosion of superheater tubes. Conventional YSZ and nanostructured YSZ samples were prepared and exposed to different environments to check their resistance to corrosion. The performances of both types of coatings were evaluated and a comparative study was made. It was found that the nanostructured YSZ samples protected the stainless steel substrate better than the its conventional counterpart. This superior performance was attributed to the presence of semi-molten nano agglomerates present in the coating microstructure which act as collection bags for the penetrating molten salts.
Language
English
DOI
doi:10.7939/R32718
Rights
License granted by Shishir Rao (rao@ualberta.ca) on 2011-07-08T17:38:56Z (GMT): 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 the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein 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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