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A comparison of the effects of multi-wall and single-wall carbon nanotube additions on the properties of zirconia toughened alumina composites
Authors:MH Bocanegra-Bernal  J Echeberria  J Ollo  A Garcia-Reyes  C Domínguez-Rios  A Reyes-Rojas  A Aguilar-Elguezabal
Affiliation:aCentro de Investigación en Materiales Avanzados, CIMAV S.C., Laboratorio Nacional de Nanotecnología, Miguel de Cervantes # 120 Comp. Ind., Chihuahua 31109, Mexico;bCEIT and TECNUN (University of Navarra), 20018 San Sebastian, Spain;cInterceramic, Dept. of R&D, Av. Carlos Pacheco 7200, Chihuahua 31060, Mexico
Abstract:The use of multi-wall carbon nanotubes (MWCNTs) or single-wall carbon nanotubes (SWCNTs) as filler in ceramic matrices could create composites with exceptional mechanical properties. We have prepared dense monolithic alumina (Al2O3) and zirconia-toughened alumina (ZTA) composites with additions of 0.01 wt% of MWCNTs or 0.01 wt% of SWCNTs by conventional sintering and have demonstrated that the mechanical properties depend on (a) the distribution of CNTs in the matrix and (b) the interaction between the ceramic phases and CNTs. The fracture toughness of Al2O3 ceramics reinforced with SWCNTs was significantly better than those reinforced with MWCNTs. However, fracture toughness in MWCNT-reinforced ZTA increased 41% over ZTA free of the toughening agent and 44% over ZTA reinforced with SWCNTs. A well dispersed and small amount of MWCNTs was enough to produce an increase of fracture toughness in ZTA composites.
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