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Enhanced oxidation resistance of ZrB2/SiC composite through in situ reaction of gadolinium oxide in patterned surface cavities

 
: Gonzalez-Julian, Jesus

:

Journal of the European Ceramic Society 34 (2014), Nr.16, S.4157-4166
ISSN: 0955-2219
Englisch
Zeitschriftenaufsatz
Fraunhofer IOF ()
zirconium diboride; machining; oxidation resistance; microstructure

Abstract
Micro-cavities on the surface of dense ZrB2/20 vol.% SiC composites, machined by ultra-fast laser ablation, were filled with Gd2O3 nanopowder and oxidized in static air at 1600 °C. Optimized rectangular pattern of cavities, 10 ?m diameter and deep, 20 ?m apart conferred improved oxidation resistance compared to the untreated ZrB2/20 vol.% SiC due to the formation of glasses of higher viscosity with lower oxygen diffusivities. Reduction of the oxidized depth was revealed by a significant decrease of 10 ?m (60%) in the extent of the protective layer. The filled-cavity strategy leads to better protection against oxygen diffusivity into the composite without altering the bulk properties.

: http://publica.fraunhofer.de/dokumente/N-307494.html