1991 Volume 31 Issue 11 Pages 1316-1321
The nitride capacities (CN3-=(%N)·PO23/4/PN21/2) in CaO-Al2O3 melts were measured by a gas-slag equilibration technique, using CaO, Al2O3, and Mo crucibles in the temperature range of 1723 to 1923 K. The oxygen partial pressures measured by a solid electrolyte cell were controlled by N2-H2-H2O gas mixtures. It was found that the nitride capacities increased with increasing temperature and Al2O3 content in the slag. Activity coefficients of AlN calculated from the reported activities of Al2O3 increased with a decrease of Al2O3 content and temperature.
