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Síntesis láser de recubrimientos cerámicos eutécticos

Authors: Francisco, I. de; Vegas, Ángel; Lennikov, V.; Bea, J. A.; Carda, J. B.; Fuente, Germán F. de la;

Síntesis láser de recubrimientos cerámicos eutécticos

Abstract

Se han obtenido, por el método “in‐situ” de síntesisde Fusión Zonal Asistida por Láser (LZM), una serie de recubrimientos eutécticos basados óxidos cerámicossobre sustrato de alúmina. Este método ha sido llevado a cabo gracias a un sistema recientemente desarrollado y patentado por nuestro grupo. En este método, la irradiación láser induce altas temperaturas en la superficie del material, permitiendo la sinterización de los precursores. El aporte simultaneo de calor generado por un horno cerámico logra impedir la formación de grietas en las muestras tratadas. Los recubrimientos de cerámicas eutécticas se han mostrado muy interesantes a la hora de mejorar las propiedades superficiales de alúmina, porcelanico y ladrillos refractarios. Estos composites consisten en una red interpenetrada de fases cerámicas cristalinas y poseen unos elevados valores en propiedades mecánicas como dureza y resistencia. Las diferentes fases presentes, que entran en competición durante el procesamiento de los recubrimientos, han sido estudiadas desde el punto de vista cristaloquímico con el fin de obtener un mayor conocimiento de los procesos de formación de loscomposites obtenidos. Mediante XRD se ha estudiado tanto la estructura como la composición de los compuestos. La microestructura de los recubrimientos eutécticos y sus interfases con el sustrato han sido observadas mediante Microscopia electrónica combinada con EDS. Se ha caracterizado la influencia de las condiciones de síntesis, como parámetros láser, temperatura del horno y velocidad de desplazamiento de la muestra, en la estructura y composición de las fases obtenidas. Los conceptos cristaloquímicos publicados por A. Vegas han sido aplicados para estudiar en detalle las relaciones estructurales que gobiernan el acoplamiento entre estos recubrimientos y el sustrato.

Resumen del trabajo presentado al LII Congreso Anual de la Sociedad Española de Cerámica y Vidrio celebrado en Burgos del 3 al 6 de octubre de 2012.

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This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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