Articles written in Bulletin of Materials Science
Volume 37 Issue 6 October 2014 pp 1397-1402
Tunable amorphous carbon nanotubes (a-CNTs) were successfully synthesized using V3O7.H2O and glucose solution as the starting materials by a novel route for the first time. The as-obtained samples were separately characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), energy-dispersive spectrometer (EDS), elemental analysis (EA), Fourier transform infrared spectroscopy (FT–IR) and Raman spectrum. The results showed that the as-obtained a-CNTs had uniform diameters with outer diameter ranging from 140 to 250 nm and inner diameter about 28 nm on an average, and their length was up to several micrometres. No VO𝑥 residues remaining in a-CNTs showed the as-obtained a-CNTs with high purity. The as-prepared a-CNTs were a kind of hydrogenated a-CNTs containing both the 𝑠𝑝3- and 𝑠𝑝2-type carbons. Furthermore, the thermal stability of the as-obtained a-CNTs in the air atmosphere were investigated by thermo-gravimetric/differential thermal analyser (TG-DTA), revealing that the as-obtained a-CNTs had good thermal stability and oxidation resistance below 300 °C in air.
Volume 41 Issue 1 February 2018 Article ID 0021
Short carbon fibres were coated with alumina by sol–gel process. Uncoated and alumina-coated short carbonfibre–Al composites were fabricated by gas pressure infiltration process. The effects of alumina coating and extrusiondeformation on microstructures and thermal properties of the composites were studied. The results showthat alumina coatingis effective to improve the quality of the short carbon fibre preform as well as act as diffusion barrier to impede interfacialharmful chemical reactions between aluminium and short carbon fibres, which would increase the thermal properties ofthe composites. Extrusion deformation can orient the carbon fibres to the extrusion direction to improve their degree oforientation, meanwhile decreasing their aspect ratio. Extrusion deformation has a beneficial effect on the thermal conductivityof the composites. However, its effect on coefficient of thermal expansion of the composites is small because the effects ofthe improvement in degree of orientation and the decrease of aspect ratio tend to cancel each other somewhat.
Volume 43, 2020
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