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Silicon-modified mesophase pitch-based graphite fibers (SGF) were prepared from mixtures of mesophase pitch and silicon (Si) nanoparticles, followed by fiber spinning, thermo-oxidative stabilization, carbonization and graphitization. The morphology and microstructure as well as physical properties of the obtained graphite fibers were characterized. Compared with the unmodified graphite fibers (GF),...
Boron (B) was doped into polyacrylonitrile-based carbon fibers (CFs) in various contents by exposing the CFs in a vapor of B by the decomposition of B 4 C. The structural evolution of B-doped CFs on different B concentrations and heat-treatment temperatures was studied using scanning electron microscope, transmission electron microscope, X-ray diffraction and Raman spectroscopy. It was found...
B 4 C/graphite composites (BGC) containing substitutional boron were fabricated by pressureless sintering of powder mixtures of petroleum coke, coal tar pitch and B 4 C. After sintering at 900°C and graphitizing at 2200°C, the microstructure of BGC was characterized by SEM, TEM, XRD, Raman spectroscopy and optical microscopy. XPS measurements revealed the formation of BC 3 ...
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