Carbon nanotubes in novel ceramic matrix nanocomposites

Novel carbon nanotubes-metal-ceramic nanocomposite powders and dense materi als have been prepared and their microstructure and mechanical properties h ave been investigated. After a brief review on the structure, synthesis and physical properties of carbon nanotubes, we describe an original catalytic method that produces ceramic-matrix composite powders that contain in situ grown nanotubes. The synthesis parameters that favour the obtention of ver y high quantities of nanotubes are discussed. The quality of the nanotubes is also addressed. The microstructure and mechanical properties of the mate rials prepared by hot-pressing of these powders are presented. The influenc e of carbon nanotubes in such composites is discussed in view of potential applications. (C) 2000 Elsevier Science Ltd and Techna S.r.l. All rights re served.