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In-situ laser synthesis of rare earth aluminate coatings in the system Ln-Al-O (Ln = Y, Gd)

AuthorsFrancisco, I. de; Lennikov, V.; Bea, J. A.; Vegas, Ángel ; Carda, J. B.; Fuente, Germán F. de la
Issue Date2011
CitationSolid State Sciences 13(9): 1813-1819 (2011)
AbstractLaser zone melting (LZM) was employed in this work to prepare Ln-Al-O coatings on polycrystalline Al2O3 substrates, using the corresponding mixtures of powdered rare-earth oxides and Al2O 3 as starting materials. In-situ synthesis of the compounds Ln = Y, Gd was performed using a CO2 laser, emitting at 10.6 μm. Microstructure (SEM) and phase nature (XRD) demonstrated in-situ formation of Al2O3/Y3Al5O12(YAG) and Al2O3/GdAlO3(GAP) eutectic systems. The interaction with the substrate resulted in mechanically stable, well integrated 200-500 μm thick composite coatings, as observed in nanoindentation tests. The phase relations found in these materials are consistent with the crystallographic concepts advanced by Vegas (Ramos-Gallardo & Vegas, J. Solid State Chem. 128 (1997) 69), where cation sub-arrays are proposed to play an important role in governing metal oxide structures. These sub-arrays are suggested as the structural drive behind eutectic oxide formation. LZM proves to be a convenient method to investigate the behaviour of complex oxide systems at high temperature, to apply a rational concept towards the understanding of phase relations and to develop design criteria for oxide coatings. © 2011 Elsevier Masson SAS. All rights reserved.
Identifiersdoi: 10.1016/j.solidstatesciences.2011.07.013
issn: 1293-2558
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