Nanosized Titanium dioxide (TiO 2 ) powder was synthesized via sol-gel method using titanium tetraisopropoxide (TTIP) as the precursor. The as prepared nano powder was used for further characterization. The phase transformation was investigated by an X-ray diffractometer (XRD). The anatase structure of titanium dioxide was obtained after calcination. The microstructure was characterized by a Scanning Electron Microscope (SEM).
Sol-gel method has been used to coat multiwalled carbon nanotubes (MWCNTs) with zirconia at room temperature and the coated tubes were sintered at high temperature. The samples were characterised by Raman spectroscopy, x-ray diffraction, environmental scanning electron microscope, transmission electron microscopy, and energy-dispersive x-ray analyses. The performance of the coated-MWCNTs was investigated as a function of temperature. The TGA studies indicated that sintering of coated-MWCNTs has improved its oxidation resistance and this improvement is related to the proper selection of sintering temperature.
Carbon-carbon composites (C/Cs) are widely used in the high-technological applications because of their superior properties compared to the other traditional materials. But the surface finishing of these materials using both conventional and unconventional machining (e.g., abrasive flow machining, AFM) is difficult because of their nonhomogeneity, anisotropy, hardness and intrinsic brittleness. In order to study the feasibility of AFM, 3-D C/Cs were initially ground to a surface roughness value in the range of 0.7 ± 0.1 µm, and then finished using newly reported media containing styrene butadiene rubber as a carrier, silicon carbide (SiC) as abrasives and hydraulic oil as a processing oil. The effects of process parameters, such as abrasive mesh size, extrusion pressure, loading of processing oil and abrasive particles, and the number of cycles on the improvement in surface roughness of the C/C material were studied. The best surface finish was observed at an extrusion pressure of 6 MPa and 150 cycles using a media having 70wt% SiC abrasive particles of 220 mesh size and 12wt% processing oil. Further, the surface texture of the workpieces was studied by scanning electron microscope.
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