Nanostructured alumina coatings manufactured by air plasma spraying: Correlation of properties with the raw powder microstructure
Φόρτωση...
Ημερομηνία
Συγγραφείς
Zois, D.
Lekatou, A.
Vardavoulias, M.
Vazdirvanidis, A.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Elsevier
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Journal of Alloys and Compounds
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
High energy ball milled nanostructured Al(2)O(3) ("N"). fused/crushed conventional Al(2)O(3) ("C") and sintered nanostructurecl Al(2)O(3) ("S") powders were air plasma sprayed on 304 stainless steel The nanostructured powder was composed of nanoparticle agglomerates, whereas the conventional powder consisted of solid granules The average crystal size of the powders was estimated by X-ray diffraction based methods (the Scheirer equation and the Williamson Hall plot) Deviations between the crystal sizes calculated by the two methods indicated high lattice strain induced by the nanopowder production technique. Sintering of the nanopowder did not cause any considerable grain growth, moreover, the strain was alleviated The melting degree of the powders, reflected by the gamma-Al(2)O(3) content of the coatings, depended on their porosities Coatings "N" presented the lowest melting degree due to the inherent porosity of the agglomerated nanoparticles composing powder "N". As a result, their microstructure was characterized by high porosity and extensive microcracking. The "S" coatings exhibited higher melting degree than that of the "N" coatings (similar to that of the "C" coatings), due to a tighter microstructure attained by sintering. At the same time, part of the initial nanostructure had been preserved during sintering and spraying The "S" coatings presented the highest adhesion because they combined a high melting degree with pockets of retained nanostructure, the latter could act as crack arresters Increasing the spray power led to an increase in the melting degree and, consequently, a decrease in the coating porosity and an increase in the porosity affected properties (adhesion and hardness) (C) 2009 Elsevier B V All rights resented.
Περιγραφή
Λέξεις-κλειδιά
nanostructured alumina, coating materials, sintering, x-ray diffraction, sem, nanophase materials, alpha-al2o3 powder, titania coatings, wear, behavior
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
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Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικών