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Compositionally graded YSZ–NiO composites by surface laser melting

AuthorsMerino, R. I. ; Peña, J. I.; Orera, V. M.
Issue Date2010
CitationJournal of the European Ceramic Society 30(2): 147-152 (2010)
AbstractLaser surface melting has been applied to near eutectic NiO–YSZ sintered ceramics. The objective is to generate a functional gradient composite material with graded microstructure and composition. At low solidification rates the resultant material has a graded composition, with a severe NiO segregation towards the surface. A thick NiO layer whose thickness depends on the travelling speed is formed. Below this layer the microstructure is eutectic like with composition varying with depth. In contact with the ceramic, excess YSZ coming from the hypereutectic composition forms an almost continuous YSZ layer. The thickness of both segregated layers, NiO and YSZ can be controlled by traverse speed. Thickness decreases as travelling speed increases until a limiting travelling rate of 110 mm/h, at which no more segregation is found. Possible causes to explain the relevant NiO segregation towards the surface are discussed.
DescriptionEl pdf del artículo es la versión post-print.
Publisher version (URL)http://dx.doi.org/10.1016/j.jeurceramsoc.2009.04.031
Identifiersdoi: 10.1016/j.jeurceramsoc.2009.04.031
issn: 0955-2219
e-issn: 1873-619X
Appears in Collections:(ICMA) Artículos
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