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The textures and microstructures of three different experimental mesophase pitch-based ribbon fibers were studied using the complementary techniques of scanning and transmission electron microscopy and wide angle X-ray diffraction. The effect of mesophase pitch precursor and capillary entry design on the structure and heat transfer capabilities of these ribbon-shaped fibers was investigated. It was...
Exposure of jet fuel to high temperatures in aircraft fuel lines triggers pyrolysis reactions which eventually lead to deposition of carbonaceous solids on metal surfaces. This is a particularly important problem for advanced future aircraft which may expose fuel to very high temperatures. Different optical textures were observed in samples of deposits formed in different sections of aircraft fuel...
A thermomechanical analysis (TMA) technique is presented for the measurement of the glass transition temperature (T g ) of glassy pitch materials. Pitches with varying mesophase content have been used for the T g determination. In this technique, the linear expansion of a mesophase pitch sample with respect to temperature is determined by means of a dilatometer. The change in the...
The influence of the addition of first stage FeCl 3 -graphite intercalated compounds (GIC) or pristine graphite to coal tar pitch (CTP) upon the formation and the development of mesophase has been studied at 400, 430 and 450°C. Differences in the final samples were principally observed and studied via polarized light microscopic examinations of partially carbonized portions of the green-cokes...
The influence of the addition of first stage FeCl 3 -graphite intercalated compounds (GIC) or pristine graphite to coal tar pitch (CTP) upon the formation and the development of mesophase has been studied at 400, 430 and 450°C. Differences in the final samples were principally observed and studied via polarized light microscopic examinations of partially carbonized portions of the green-cokes...
The synthesis of a boron-substituted polyaromatic mesophase was studied by copyrolysis of a filtered coal tar pitch with pyridine-borane under a 1 MPa argon atmosphere. The pyrolysis temperature was varied between 360 and 420°C, the boron content of the pitch-pyridine-borane mixture was increased step by step up to 5%. Pyridine-borane is decomposed above 120°C; the pyridine is volatilized, and the...
A spherulitic mesophase pitch with about 50 vol% mesophase has been synthesized by an iron-catalyzed pyrolysis of a coal tar pitch. The isotropic pitch is removed to various extents by solvent extraction. The thermoplasticity of the resulting raw mesophase powders is adjusted by treatment with oxygen with respect to optimum sintering properties. After milling of these powders to a particle sized...
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