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Characterization of columns grown during KrF laser micromachining of Al2O3–TiC ceramics

Published online by Cambridge University Press:  31 January 2011

V. Oliveira  and
R. Vilar
V. Oliveira
Affiliation:
Department of Engineering Materials, Instituto Superior Téico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
R. Vilar
Affiliation:
Department of Engineering Materials, Instituto Superior Téico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
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Abstract

This paper aims to contribute to the understanding of column formation mechanisms in Al2O3–TiC ceramics micromachined using excimer lasers. Chemical and structural characterization of columns grown in Al2O3–TiC composite processed with 200 KrF laser pulses at 10 J/cm2 was carried out by scanning electron microscopy, transmission electron microscopy, x-ray photoelectron spectroscopy, and x-ray diffraction analysis. Fully developed columns consist of a core of unprocessed material surrounded by an outer layer of Al2TiO5, formed in oxidizing conditions, and an inner layer, formed in reducing conditions, composed of TiC and Al3Ti or an AlTi solid solution. Possible mechanisms of column formation are discussed.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 5 , May 2003 , pp. 1123 - 1130
Copyright
Copyright © Materials Research Society 2003

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