Multi-walled carbon nanotube/nanostructured zirconia composites: Outstanding mechanical properties in a wide range of temperature

Multi-walled carbon nanotube (MWCNT)/nanostructured zirconia composites with a homogenous distribution of different MWCNT quantities (ranging within 0.5–5 wt.%) were developed. By using Spark Plasma Sintering we succeeded in preserving the MWCNTs firmly attached to zirconia grains and in obtaining f...

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Bibliographic Details
Published in:	Composites science and technology Vol. 71; no. 7; pp. 939 - 945
Main Authors:	Mazaheri, Mehdi, Mari, Daniele, Hesabi, Zohreh Razavi, Schaller, Robert, Fantozzi, Gilbert
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier Ltd 2011 Elsevier
Subjects:	A. Carbon nanotubes A. Ceramic–matrix composites (CMCs) B. Creep B. Mechanical properties Creep (materials) Cross-disciplinary physics: materials science; rheology Engineering Sciences Exact sciences and technology Materials Materials science Mechanical properties Mechanical spectroscopy Multi wall carbon nanotubes Nanomaterials Nanoscale materials and structures: fabrication and characterization Nanostructure Organic-inorganic hybrid nanostructures Physics Resistivity Toughening Zirconium dioxide Mechanical spectroscopy B. Creep B. Mechanical properties A. Ceramic–matrix composites (CMCs) A. Carbon nanotubes Ceramic matrix composite Strengthening Electrical conductivity Creep Electrical properties A. Ceramic-matrix composites (CMCs) Carbon nanotubes Mechanical properties Dispersion reinforced material Experimental study Oxide ceramics Fracture toughness Spark plasma sintering Quantity ratio Composite materials Nanocomposites Multiwalled nanotube Temperature effects Zirconium Oxides High resolution electron microscopy Ceramic matrix composites Mechanisms Multiwalled carbon nanotubes (MWCN) Grain growth Zirconia Ceramic materials Electric conductivity
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Summary:	Multi-walled carbon nanotube (MWCNT)/nanostructured zirconia composites with a homogenous distribution of different MWCNT quantities (ranging within 0.5–5 wt.%) were developed. By using Spark Plasma Sintering we succeeded in preserving the MWCNTs firmly attached to zirconia grains and in obtaining fully dense materials. Moreover, MWCNTs reduce grain growth and keep a nanosize structure. A significant improvement in room temperature fracture toughness and shear modulus as well as an enhanced creep performance at high temperature is reported for the first time in this type of materials. To support these interesting mechanical properties, high-resolution electron microscopy and mechanical loss measurements have been carried out. Toughening and creep hindering mechanisms are proposed. Moreover, an enhancement of the electrical conductivity up to 10 orders of magnitude is obtained with respect to the pure ceramics.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0266-3538 1879-1050
DOI:	10.1016/j.compscitech.2011.01.017