Viscosities of Borate-base Binary Molten Oxides and Characteristic Features of the Viscosity of Molten Salts

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  • B<SUB>2</SUB>O<SUB>3</SUB>基2成分酸化物融体の粘度ならびに溶融塩の粘性特性
  • B2O3基2成分酸化物融体の粘度ならびに溶融塩の粘性特性
  • B2O3キ 2セイブン サンカブツ ユウタイ ノ ネンド ナラビニ ヨウユウエ

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Abstract

A clear understanding of characteristic features of molten salts requires quantitative discussions on their network structures. From this point of view, viscosities of pure molten borate and borate-base binary oxides, in which network structures would be formed, have been measured by using an oscillating-plate viscometer. Furthermore, characteristic features of viscosity of molten salts have been discussed on the basis of model theories. The results obtained are as follows:<BR>(1) Viscosities of molten B2O3 are expressed in the following non-Arrhenius equation:<BR>μ=0.103 exp (5.17×107/RT2) (in Pa·s)<BR>(2) As compared with the viscosities of molten B2O3, the viscosities of molten B2O3-2mol% SiO2 are high, while the viscosities of molten B2O3-2mol% ZnO, BaO, PbO, Na2O are low in that order. This order corresponds approximately to that of the relative strength of acidity→basicity for the oxides.<BR>(3) Since network forming melts have higher viscosity values, positive deviations from the viscosities calculated by using an equation for simple melts would provide a quantitative approach to the network structures of melts.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 73 (3), 469-475, 1987

    The Iron and Steel Institute of Japan

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