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The radial dielectric spectroscopy of the carbon fiber bundle (CFB) array/epoxy resin composites have been performed over the frequency range from 8.2 to 12.4GHz. The complex permittivity of the composite increases with the volume fraction, which is attributed to the increase of polarization, and decrease with the CFB diameter along the electric field direction which is ascribed to the increase of...
Silicon carbide nanofibers (SiCNFs) used as the second reinforcements of carbon/carbon composites were grown radially on the carbon fiber surface. The microstructure of SiCNFs and their effects on the microstructure and flexural properties of C/C composites were investigated. Results show that there are many defects such as twin crystals and stacking faults in SiCNFs which were grown by catalytic...
Unidirectional carbon/carbon (C/C) composites were fabricated by catalytic chemical vapor infiltration, using electroless Ni–P as catalyst. Transmission electron microscopy (TEM) investigations indicate that the catalyst particles (100–800nm) in the pyrocarbon (PyC) matrix are composed of Ni 3 P and Ni phases, but only the Ni 3 P phase was observed in the tiny catalyst particles (<50nm)...
Introduction of carbon nanofibers (CNFs) into carbon/carbon (C/C) composites is an effective method to improve the mechanical properties of C/C composites. In situ grown CNFs reinforced C/C composites as well as conventional C/C composites without CNFs were fabricated by chemical vapor infiltration. Transmission electron microscopy investigations indicate that the entangled CNFs (30–120nm) formed...
The catalytic effect of boric acid on the graphitization and surface structure of polyacrylonitrile-based carbon fibers was investigated by dipping fibers in boric acid before heating at 2500°C. The thermal conductivity of carbon/carbon composites produced from the modified carbon performs by chemical vapor infiltration was also studied. The results show that the treatment by boric acid has a catalytic-graphitization...
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