FORMS OF PYROLYTIC CARBON ENSUING ON THERMAL DEGRADATION OF COAL AND CARBONACEOUS ADDITIVES
Abstract
Pyrolysis of coal and carbonaceous additives in the glow zone of foundary moulds gives rise to coke and volatile products. This pyrolytical process was modeled and studied on two stages. In the first stage of pyrolysis ( 900°C, 5°C/min) of a standard sample of bituminous coal and its mixtures with carbonaceous additives, the yields of coke and volatile products were determined. The volatile fraction was then thermally degraded during the second stage of pyrolysis (at 1100°C). This resulted in two other products: less ordered amorphous carbon and highly structured lustrous carbon. The chemical analysis (C, H, Cat/Hat) as well as measurement of various physical characteristics (density, x-ray diffraction pattern) reveals remarkable difference between the degree of order in coke, amorphous carbon and lustrous carbon.
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