Effect of multi-walled carbon nanotube (MWNT) on mechanical/conductive properties of CNT-carbon nano composites.

摘要

The carbon nanotube composites have the potential for becoming "super -strongmaterials." If the unique properties of carbon nanotubes could be utilized in composites then could able to get materials that are stronger, stiffer, more thermally conductive, and more electrically conductive than anything that is used today. In addition, they would be light and ductile. In the present work effort has been made to develop multi-walled carbon nanotube (MWNT) reinforced carbon matrix (MWNT/C) nanocomposites without using tradition pitch as carbon matrix. The self-sintering green coke has used as carbon matrix precursor. This coke is prepared from heat treatment of coal tar pitch at suitable temperature. The MWNTs -Carbon composites are prepared by using commercial MWNT in different proportions (1-10 vol%) in the coke matrix through ball milling. The mixture later on are moulded into blocks/plates and heat treated at 1000°C and 2500°C in inert atmosphere to obtain the CNTs -Carbon nano composites. These nanocomposites are characterized for mechnical electrical and thermal properties. It is observed that bulk density of nanocomposite varies from 1.84 to 1.92 g/cm~3 and bending strength from 65 to 87 MPa of the composites graphitezed at 2500°C for 1 vol % CNTs in the composite. The thermal and electrical conductivity of the nanocomposites are decreases with increasing CNT content. The Xray and raman spectroscopy study shows that with increasing CNTs content in composite ID/IG ratio increases after certain content of CNTs, this may be due to the CNTs restrains the crystallite growth of carbon matrix and as a result increase in disorder carbon in the overall composite. The detail results will be discuss during the conference.