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RESEARCH PRODUCT
Mechanical, thermal and electrical properties of nanostructured CNTs/SiC composites
Yves JorandN. DebskiA. HabertFrédéric BernardS. Le GalletGilbert FantozziB. LanfantM. Mayne-l′hermiteGuillaume BonnefontM. PinaultYann LeconteVincent Garniersubject
ToughnessMaterials scienceSpark plasma sinteringchemistry.chemical_elementSintering02 engineering and technologyCarbon nanotube01 natural scienceslaw.inventionThermal conductivitylawElectrical resistivity and conductivity0103 physical sciencesMaterials ChemistryComposite material010302 applied physicsProcess Chemistry and Technology[CHIM.MATE]Chemical Sciences/Material chemistry021001 nanoscience & nanotechnologyMicrostructureSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialschemistryCeramics and Composites0210 nano-technologyCarbondescription
International audience; Dense SiC-based nanostructured composites reinforced by well-distributed carbon nanotubes (CNTs) were elaborated for the first time by spark plasma sintering (SPS) without sintering additive. Microstructures of materials containing different amounts of CNTs – up to 8.0 vol% – were correlated with their mechanical, electrical and thermal properties. A continuous decrease of the SiC grain size was observed when the amount of CNT was increased, while the evolution of density showed a different behavior that could be explained by the particular combination of SPS technique with the electrical resistivity evolution of the green bodies. Optimal effect of CNTs addition on hardness and toughness was obtained for 3.2 vol% CNTs, with values of 2560 Hv and 4.0 MPa m$^{1/2}$, respectively. The decrease in electrical resistivity observed after sintering was ascribed to a combined effect of CNTs with the emergence of structured carbon during the sintering. Enhancement of thermal conductivity with CNTs addition was on the contrary not observed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-10-25 |