Surface graphitization and mechanical properties of hot-pressed bulk carbon nanotubes compacted by spark plasma sintering

Hydroxyapatite-Nanotube Composites and Coatings for Orthopedic Applications

“…Due to shorter time of sintering, SPS retains the nanostructure and improves the mechanical property of the sintered body [19,[50][51][52][53][54]. In addition, minimal dwell at high temperature causes lesser dissociation of HA into TCP [56][57][58][59][60][61].SPS of HA-CNT has employed temperatures in the range of 900 -1250 °C [42,46] , pressure of 7.5-120 MPa [42,46] in vacuum [41] or argon [31]. The systematic studies on the determination of ideal SPS temperature for HA-CNT system found 1100°C…”

Graphene NanoPlatelets reinforced tantalum carbide consolidated by spark plasma sintering

“…Several studies have been conducted on the feasibility of CNT survival and structure retention during high pressure and high temperature SPS processing. Bulk CNT and MWCNT samples have been consolidated by SPS using pressures ranging from 7 MPa to 100 MPa, and temperatures ranging from 1100 ˚C to 1600 ˚C [121][122][123][124]. Laurent et al [123] sintered double-walled CNTs by SPS at 1100 ˚C and 100 MPa and based on Raman spectroscopy and electron microscopy they assessed that no significant damage had been incurred by the CNT.…”

Metallurgical Challenges in Carbon Nanotube-Reinforced Metal Matrix Nanocomposites

“…To exploit the full potential of CNTs in nanocomposites, one should deeply understand the structural phenomena and microstructural interactions likely occurring during the synthesis or post-treatments of these new emerging materials. The first key to this issue is the profound consideration of structural transitions and phase transformations of CNTs in pure state and in exposure to a metallic matrix, because they can adversely affect the intrinsically superior properties of pure CNTs [105][106][107][108][109]. Table 2 summarizes the recently reported structural transitions of pure CNTs in a variety of densification methods and their influences on the properties.…”