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Role of Mn and Co additives on the carbothermal nitridation of fly ash
Shunkichi Ueno,Hideki Kita,Tatsuki Ohji 한양대학교 세라믹연구소 2005 Journal of Ceramic Processing Research Vol.6 No.4
The effects of Mn and Co additives on the carbothermal nitridation of fly ash were examined at 1330, 1425 and 1475 oC in a N2 atmosphere under normal pressure. Above 1425 oC, the nitridation of fly ash occurred and oxy-nitride phases, such as β-type sialon, α-type sialon and X2N2O (X=C or Si) type oxy-nitride phases were formed. The phase ratio among these phases was changed with the amount of additives. In the case of a Mn additive, the a to b phase transformation of sialon was accelerated with the amount of the additive. On the other hand, in the case of a Co additive, no effective role on the transformation was observed. At 1475 oC, the ash completely changed to β-type sialon.