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Enhanced high-temperature creep resistance of single-wall carbon-nanotubes-reinforced alumina polycrystals

Eugenio Zapata-Solvas 1Rosalía Poyato 1Diego Gómez-García 1Arturo Domínguez-Rodríguez 1Zonghon Lee 3Velimir Radmilovic 3Nitin P. Padture 2

1. Universidad de Sevilla (USE), Sevilla 41012, Spain
2. Department of Materials Science and Engineering, the Ohio State University, Columbus 43210, United States
3. Lawrence Berkeley National Laboratory, National Center for Electron Microscopy (LBNL), Berkeley, CA, United States

Abstract

This work outlines the remarkably enhanced creep resistance of single-walled carbon-nanotubes-reinforced alumina polycrystals. When tested at similar conditions of stress and temperature, the strain rate of such material is two orders of magnitude lower than that reported in non-reinforced alumina polycrystals. The sample processing technique is carefully described as well as the microstructural characterization of the sintered specimens. Particular emphasis is focused on the homogeneity of the nanotubes distribution onto the ceramic grain boundaries. Furthermore, it was verified that nanotubes have not lost their single-walled character either during sintering or during mechanical testing.

The results are compared with those found in literature for rare earth-doped alumina solid solutions. The role of a non-homogeneous distribution of nanotubes is also discussed.

 

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Related papers

Presentation: Oral at E-MRS Fall Meeting 2008, Symposium F, by Eugenio Zapata-Solvas
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-05-14 12:27
Revised:   2009-06-07 00:48