The viability of a high power diode laser source as effective post-deposition treatment technique of functionally graded titanic-HA coatings was checked. In particular, several laser treatments were performed on various coatings plasma-sprayed under different conditions to verify the presence of an operative window large enough for practical purposes and, subsequently, to identify the most promising settings of the laser parameters. Laser power as low as 80-100 W and focus distance as high as -4 mm were found to be the most feasible choice to improve the overall coating properties as well as to inhibit undesired secondary reactions between calcium phosphates and titania. Finally, the best set of the laser parameters were applied to a pure HA coating and to a titanic-HA graded one, plasma-sprayed under the same conditions, to perform a comparative evaluation. The microstructural characterization by scanning electron microscopy, X-ray diffraction and the local mechanical investigation by Vickers micro-indentations proved that the degree of crystallinity of HA at the outermost layers of the graded coating could be improved without significantly altering the compositional and functional gradient. Furthermore, the properties of the pure HA coating, as-sprayed and laser treated, were found to be substantially less advantageous than those of the titanic-HA functionally graded coating (higher microstructural defectiveness; inferior degree of crystallinity of HA at the working surface; lower Vickers hardness), thus confirming the beneficial effect of the compositional gradient. (C) 2009 Elsevier Ltd. All rights reserved.

Cannillo, V., Lusvarghi, L., Sola, A., Barletta, M. (2009). Post-deposition laser treatment of plasma sprayed titanic-hydroxyapatite functionally graded coatings. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 29(15), 3147-3158 [10.1016/j.jeurceramsoc.2009.05.053].

Post-deposition laser treatment of plasma sprayed titanic-hydroxyapatite functionally graded coatings

BARLETTA, MASSIMILIANO
2009-01-01

Abstract

The viability of a high power diode laser source as effective post-deposition treatment technique of functionally graded titanic-HA coatings was checked. In particular, several laser treatments were performed on various coatings plasma-sprayed under different conditions to verify the presence of an operative window large enough for practical purposes and, subsequently, to identify the most promising settings of the laser parameters. Laser power as low as 80-100 W and focus distance as high as -4 mm were found to be the most feasible choice to improve the overall coating properties as well as to inhibit undesired secondary reactions between calcium phosphates and titania. Finally, the best set of the laser parameters were applied to a pure HA coating and to a titanic-HA graded one, plasma-sprayed under the same conditions, to perform a comparative evaluation. The microstructural characterization by scanning electron microscopy, X-ray diffraction and the local mechanical investigation by Vickers micro-indentations proved that the degree of crystallinity of HA at the outermost layers of the graded coating could be improved without significantly altering the compositional and functional gradient. Furthermore, the properties of the pure HA coating, as-sprayed and laser treated, were found to be substantially less advantageous than those of the titanic-HA functionally graded coating (higher microstructural defectiveness; inferior degree of crystallinity of HA at the working surface; lower Vickers hardness), thus confirming the beneficial effect of the compositional gradient. (C) 2009 Elsevier Ltd. All rights reserved.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore ING-IND/16 - Tecnologie e Sistemi di Lavorazione
English
Con Impact Factor ISI
Beneficial effects; Coating properties; Comparative evaluations; Compositional gradients; Degree of crystallinity; Focus distance; Functional gradient; Functionally graded; Functionally graded coatings; Graded coating; HA coating; High power diode laser; Laser parameters; Laser power; Laser treated; Laser treatment; Micro indentation; Micro-structural; Micro-structural characterization; Microstructure-final; Plasma sprayed; Post deposition treatment; Post-deposition; Secondary reactions; TiO; Titanias; Vickers; X- Ray diffraction; Apatite; Biological materials; Calcium; Calcium phosphate; Hydroxyapatite; Hydroxylation; Lasers; Microstructure; Phosphate minerals; Plasma deposition; Plasma spraying; Plasmas; Protective coatings; Scanning electron microscopy; Titanium dioxide; Titanium oxides; Vickers hardness; Windows; Sprayed coatings
Cannillo, V., Lusvarghi, L., Sola, A., Barletta, M. (2009). Post-deposition laser treatment of plasma sprayed titanic-hydroxyapatite functionally graded coatings. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 29(15), 3147-3158 [10.1016/j.jeurceramsoc.2009.05.053].
Cannillo, V; Lusvarghi, L; Sola, A; Barletta, M
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/46771
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