Surface Tensions and Densities of Molten Al203, Ti203, V205 and Nb205

Abstract

Surface tensions and densities of molten Al203, Ti203, V205and Nb205were determined accurately by the maximum bubble pressure method. the measurements were carried out under Ar + 10%H2 for molten Al203and Ti203, and under air for molten V205and Nb205. Surface tension and density of molten Al203near the melting point are 606±6 mNM -1 and 3.06±0.03 x 103kg m-3, and those of molten Ti203are 584 + 5 mN m-1 and 3.91 +0.03 x 103kg m-3, respectively. the temperature coefficient of surface tension of molten V205 is slightly positive value of 0.0111 mNm-1K-1, while for molten Nb205it is negative value of -0.0596 mNM-1 K-1. This suggests that the network structure of molten V205 changes with temperature. the temperature coefficient of density of molten V205is very low. the results are discussed in comparison with those of other molten pure oxides and fluorides having high melting points. © 1993, The Iron and Steel Institute of Japan. All rights reserved.