Abstract
Pyrolytic carbon was deposited in a tumbling bed under various pyrolysis conditions by varying the process variables such as the speed of rotation of the reactor, total flow-rate, number of bed particles and propane concentration. The structures of pyrolytic carbons were characterized under an optical microscope with polarizing light and a scanning electron microscope. A laminar structure is obtained when the propane concentration is low, a large number of bed particles is provided and the speed of rotation of the reactor is high. Isotropic and columnar structures are also obtained under different pyrolysis conditions. It is suggested that a laminar structure is formed as a result of the continual deposition of gas-borne droplets by eddy current of pyrolysing gas and the surface growth of droplets at deposition sites. The mechanism of deposition of columnar and isotropic pyrolytic carbon is also explained in terms of the suggested mechanism for laminar pyrolytic carbon.
Published Version
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