0000000001011088
AUTHOR
Gilbert Fantozzi
Nano-SiC/CNT composites sintered by SPS: CNT amount effect on mechanical, thermal and electrical properties.
International audience
Propriétés mécaniques, thermiques et électriques de composites à matrice SiC nanostructurée renforcée de nanotubes de carbone
International audience
Mechanical, thermal and electrical properties of nanostructured CNTs/SiC composites
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 h…
Domain Walls Motions in Barium Titanate Ceramics
The shear modulus and mechanical loss at low frequencies (0.01, 0.3, 1 Hz) are measured by an inverted pendulum for BaTiO 3 ceramic with large grain sizes. The permittivity and dielectric losses are also investigated for the same material at higher frequencies between 1 and 100 kHz as function of temperature. Those results show several relaxation peaks in the ferroelectric phases. The activation energy of each peak is obtained to be 0.29, 0.45, 0.68, 0.92 eV. The influences of strain amplitude and thermal treatments are studied specially for the mechanical relaxation peak located in the tetragonal phase. All the relaxation peaks could be associated to the interaction of oxygen vacancies in …
Propriétés mécaniques, thermiques et électrioques de composites à matrice SiC nanostructurée renforcée par des nanotubes de carbone
International audience