The nitrogen and carbon solubilities in the CaO-Al2O3-CaF2 slag system at 1723K were measured to understand the effect of CaF2 on the nitrogen and carbon dissolution behaviour using thermochemical equilibration technique. The nitride capacity in the CaOsatd.-Al2O3-CaF2 system was constant until XAl(2)O(3)/XCaF(2) = 0.23, followed by decrease with an increase in XAl(2)O(3)/XCaF(2) ratio, and then showed a constant value. The carbide capacity in the CaOsatd.-Al2O3-CaF2 system also showed the similar behaviour to the nitride capacity, however, the effect of CaF2 on the activity coefficient of nitride and carbide ions showed some differences in case of XCaF(2) = 0.2. The effect of CaF2 on the activity coefficient of carbide and nitride ions would not be significant in case of CaO-rich region of XCaO/XCaF(2) = 0.31. However, CaF2 could be expected to affect the activity coefficient of each ion in case of the Al2O3-rich region, causing compensating effect of the incorporated nitride (carbide) mechanism. The relationship between nitride and carbide capacity was also discussed.
All Science Journal Classification (ASJC) codes
- Metals and Alloys