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Open Access item Laser-assisted, crack-free surface melting of large eutectic ceramic bodies

Authors:Gurauskis, J.
Lennikov, V.
Fuente Leis, Germán de la
Merino, R. I.
Keywords:Laser remelting, Al2O3-ZrO2, Defects, Surfaces, Mechanical properties
Issue Date:2010
Citation:Journal of the European Ceramic Society 31(7): 1251-1256 (2011)
Abstract:The modification of ceramic surfaces by directional laser melting is interesting because it can eliminate surface defects and thus improve the ceramics mechanical performance, as long as one prevents the formation of cracks. The feasibility of surface modification by laser assisted melting on large t-ZrO2-Al2O3 eutectic ceramic pieces was evaluated in this work. 0.4 mm thick, defect free, resolidified layers were obtained on plates of 40 mm width by preheating at 1200 ºC and processing at 1000 mm/h with a line-shaped CO2 laser beam and 580 W/cm2 irradiance. The surface finish was smooth, free from overlapping-track roughness. The resolidified layer had eutectic microstructure with lamellae-type Al2O3 and tetragonal ZrO2(t-ZrO2) colonies. The fracture tests of the samples confirmed the absence of crack type resolidification defects and the removal of surface defects. Although no increase in average flexural strength was observed for surface resolidified samples, they showed significantly lower standard deviation.
Description:6 páginas, 5 figuras, 1 tabla.-- El pdf del artículo es la versión post-print.
Publisher version (URL):http://dx.doi.org/10.1016/j.jeurceramsoc.2010.08.017
Appears in Collections:(ICMA) Artículos

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