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Microstructural observation of artificial aggregates at various sintering atmospheres  

Park, Ji-Yun (School of Advanced Industrial Engineering, Department of Materials Science & Engineering, Kyonggi University)
Kim, Yoo-Taek (School of Advanced Industrial Engineering, Department of Materials Science & Engineering, Kyonggi University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.16, no.2, 2006 , pp. 71-75 More about this Journal
Abstract
The aggregates made of clay, carbon and $Fe_2O_3$ were prepared to investigate the mechanism of black core formation and the property differences at various sintering atmospheres. The aggregates were sintered at oxidized, neutralized and reduced atmospheres. The specific gravity, absorption rate, percent of black core area were measured at various compositions and sintering atmospheres. The aggregates sintered at oxidized atmosphere showed clear border between shell and black core area. Hence, the aggregates sintered at reduced and neutralized atmospheres showed only black core area in the cross-section of the aggregates. The specific gravity of the aggregates sintered at reduced atmosphere increased with increasing carbon contents and that was the lowest of all aggregates sintered at various atmospheres. Adsorption rate increased with increasing carbon contents at all atmospheres.
Keywords
Aggregates; Sintering atmosphere; Black core; Carbon; $Fe_2O_3$;
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