Abstract
Interesting effects of fluoride additives, LiF, NaF and CaF2, on the solid-state reactions in the MgO - Cr2O3 and ZnO - Cr2O3 systems under an atmosphere of nitrogen were observed by means of DTA. For the MgO Cr2O3 - MF (M=Li, Na) systems, it was concluded that the melting of the fluoride additives plays an important role in accelerating the second reaction step at around 1000°. On the other hand, for the ZnO- Cr2O3 - MF (M=Li, Na) systems, a great acceleration by the additives was observed in the first reaction step at around 700°, a much lower temperature than the melting points of the fluorides. The effect of CaF2 was not clear in either system.
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