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Morphological forms of carbon and their utilizations at formation of iron casting surfaces

Jelinek P., Beňo J.

Archives of Foundry Engineering

2008

Vol. 8, iss. 2

67-70

Model pyrolysis made possible to identify three solid products of carbonaceous additives. Lustrous carbon is the most important form of the pyrolysis carbon. With its structure and physical and chemical properties it comes near to graphite. Amorphous carbon with turbo-stratic lattice, higher oxireactivity, and lower protective function against liquid metal comes near to carbon black. Semicoke also plays a non-negligible role. All forms of carbon have an important representation in oolitized quartz grain also during forming the casting surface. While amorphous carbon is formed directly from the gaseous phase by homogeneous nucleation, lustrous carbon, with regard to similarity of lattices with quartz, is formed by heterogeneous nucleation on grains. High covering power and low oxireactivity give its highest protecting power of the mould face. New experimental equipment made possible to check a possibility of use of new composite bentonite binders containing "process carbon" (graphite, anthracite, amorphous carbon). The BTEX content in exhalations and in waste sands too was considerably decreased with high smoothness of castings.