CARBON NANOTUBE--METAL--OXIDE NANOCOMPOSITES: MICROSTRUCTURE, ELECTRICAL CONDUCTIVITY AND MECHANICAL PROPERTIES

摘要

Carbon nanotube-metal--oxide composites (metaI=Fe, Co or Fe/Co alloy; oxide=Al_2O_3, MgO or MgAl_2O_4) have been prepared by hot--pressing the corresponding composite powders, in which the carbon nanotubes, mostly single or double-walled, are very homogeneously dispersed between the metaboxide grains. For the sake of comparison, ceramic and metal--oxide nanocomposites have also been prepared. The microstructure of the specimens has been studied and discussed in relation to the nature of the matrix, the electrical conductivity, the fracture strength and the fracture toughness. The carbon nanotllbe--metal--oxide composites are electrical conductors owing to the percolation of the carbon nanotubes.