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Parallel, stretched and evenly arranged mesophase pitch based graphitized carbon fibers with diameters of 50–53μm were coated with different amounts of acrylonitrile butadiene styrene (ABS) resin, and hot-pressed to produce carbon fiber/ABS resin composites. The morphology, optical texture and crystal structure of the carbon fibers and their composites were characterized by scanning electron microscopy,...
C/C composites reinforced using carbon felt and 3K carbon cloth laminated preforms were prepared by chemical vapor infiltration and samples taken from them were subsequently subjected to heat treatment at 2500°C. The microstructures of the C/C composites were characterized by X-ray diffraction, polarized light microscopy and Raman spectroscopy. Results showed that the matrix of composites reinforced...
Multi-wall carbon nanotubes (MWCNTs) were synthesized by detonation-assisted chemical vapor deposition using a series of rare earth (RE) oxides as catalysts. Energy dispersive X-ray spectroscopy, selected area electron diffraction and powder X-ray diffraction show that the catalysts, usually located outside the MWCNTs, have not been reduced, in sharp contrast to conventional catalysts in the form...
Carboxylated carbon nanotube-filled polymethylmethacrylate (CNT/PMMA) ultra-long composite nanofibers were prepared by electrospinning of in-situ polymerized CNT/PMMA bulk composites under shear flow in a quartz capillary tube. They were characterized by SEM, TEM and FT-IR. The degree of orientation of the CNTs in the nanofibers was investigated by polarized Raman spectroscopy. The force imposed on...
Interconnected carbon micro-spheres (CMSs) with diameters in the range of 3–5μm were synthesized by acetylene pyrolysis at 750°C on a SiO 2 substrate. The CMSs have a graphitic structure with many intrinsic defects. Results indicate that the CMSs show both diamagnetic and paramagnetic behavior. Intrinsic defects have magnetic moments with spin 1/2. Approximately every 1000 carbon atoms contribute...
Graphene was synthesized by the detonation-assisted reduction of graphite oxide (GO) prepared by the modified Hummers method. Nitrogen-doped reduced GO (N-RGO) was obtained through an in situ nitrogen-doping during detonation. The morphology, elemental composition and structure of the N-RGO were characterized by TEM, SEM, IR, XPS, XRD and Raman spectroscopy. The catalytic activity of the N-RGO as...
Nano-SiC (SiC n ) coating was deposited on SiC pre-coated C/C composites by a hydrothermal electrophoretic deposition. The phase compositions, surface and cross-section microstructures, and anti-oxidation properties of the multilayer coatings were investigated. Results show that hydrothermal electrophoretic deposition is an effective route to prepare smooth and homogeneous SiC n coating...
A SiC coating for carbon/carbon(C/C) composites was produced by a pack cementation technique in an argon atmosphere. The phase, microstructure and anti-oxidation property of the SiC coatings prepared from 1773 to 2273 K were investigated. It is found that the porous β-SiC coatings occur at 1773-1973 K while dense Si/β-SiC coatings generate at 2073 K and micro-cracked β-SiC/α-SiC coatings appear at...
In order to exploit the unique high temperature mechanical properties of carbon/carbon (C/C) composites, a new type of oxidation protective coating has been produced by a two-step pack cementation technique in an argon atmosphere. XRD analysis showed that the internal coating obtained from the first step was a gradient SiC layer that acts as a buffer layer, and the multi-layer coating formed in the...
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