Effects of organic additives on alumina coatings on stainless steel obtained by spray pyrolysis |
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Authors: | Nenad Radi? Boško Grbi? Tatjana Novakovi? Dimitar Stoychev |
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Institution: | a IChTM-Department of Catalysis and Chemical Engineering, University of Belgrade, Belgrade,11000, Serbiab Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia 1113, Bulgariac Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria |
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Abstract: | Alumina coatings were obtained by deposition of boehmite sol, with added polyvinyl alcohol or polyethylene glycol, on stainless steel foil by spray pyrolysis method. Characterizations of coatings were performed by SEM, XRD, XPS, AFM and SBET analysis. Alumina coating prepared with polyethylene glycol has improved resistance to surface area loss than coating obtained with polyvinyl alcohol. At elevated temperatures polyethylene glycol has preserved the morphology of alumina coating and prevents the diffusion of Fe from stainless steel substrate. Porous, foam-like aluminium oxide coating, consisted of accidentally distributed rings of alumina, was created from both additives. Such coating morphology, with a hierarchical porosity, has application in numerous catalytic processes. |
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Keywords: | Alumina coating Spray pyrolysis Surface morphology Polyethylene glycol Polyvinyl alcohol |
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