ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
The Surface Viscosities and the Foamines of Molten Oxides
Shigeta HaraMitsuaki KitamuraKazumi Ogino
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1990 Volume 30 Issue 9 Pages 714-721


Viscosities of melts in the systems, Na2O-P2O5, BaO-B2O3, Na2O-B2O3 and Na2O-SiO2 were measured at 1000°C on the surface as well as in the bulk phase by using a modified rotating viscometer. For some melts, it was found that the viscosity on the surfaces is higher than that in the bulk phase. The highly viscous layer on the surface suggests that concentration of surface active component such as B2O3 in the system BaO-B2O3 is higher on the surface than in the bulk phase. Foaminess of the melts was also measured. It is concluded that higher viscosity of the melt itself is important, but not enough to stabilize the foam, and higher surface tension depression by the melt composition is also required.

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