This research explores the use of a variety of nanoparticles to impart conductivity to ceramic matrices. We have chosen some highly promising families of carbon materials: multiwall carbon nanotubes (MWCNTs), singlewall carbon nanotubes (SWCNTs), carbon black nanograins and graphite micrograins for use as fillers. In this book chapter, we report the results about two types of carbon nanotubes. The MWCNTs and SWCNTs were dispersed in silicon nitride matrix in different percentages high as 1-5wt%. A high efficient attritor mill has also been applied for proper dispersion of MWCNTs in the matrix. In order to get the full use of the benefits provided by carbon nanotubes (CNT) it is crucial to retain CNT un-attacked in the composites and to optimize the interfacial bonding between CNT and matrix. By conventional sintering techniques, which are characterized by the requirement of extended holding at very high temperatures, the destruction of CNT has been reported. In the present work the development of sintering processes have been performed to consolidate and tailor the microstructure of MWCNTs reinforced silicon nitride-based ceramic composites. The silicon nitride nanocomposites systems retained the mechanical robustness of the original systems. Bending strength high as 700 MPa was maintained and an electrical conductivity of 10 S/m was achieved in the case of 3 wt% MWCNT addition. Electrically conductive silicon nitride ceramics have also been realized by carbon black (in order of 1000 S/m) and graphite additions in comparison. Examples of these systems, methods of fabrications, electrical percolation, mechanical properties and potential uses will be discussed.
|Title of host publication||Carbon Nanotubes|
|Subtitle of host publication||New Research|
|Publisher||Nova Science Publishers, Inc.|
|Number of pages||24|
|Publication status||Published - Dec 1 2009|
ASJC Scopus subject areas
- Chemical Engineering(all)