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首页> 外文期刊>ISIJ international >Development of Wide-range Viscometer and the Viscosity Measurement for SiO_2-Na_2O-NaF System
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Development of Wide-range Viscometer and the Viscosity Measurement for SiO_2-Na_2O-NaF System

机译：SiO_2-Na_2O-NaF体系宽量程粘度计的研制和粘度测量

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摘要

A rotating crucible viscometer previously developed by the authors was improved in order to measure wide-range of viscosity values with high reliability. Two sets of inner cylinder and crucible with different geometries were employed as an attempt to accomplish this objective. The centers of these components were matched with accuracy of ± 0.1 mm by adopting X-Y stage for positioning. Relative error in torque measurement was less than 1.5%, and calibration curves had a good consistency for all experiments. By using the improved viscometer, a typical molten salt, LiF-10 mol% NaF-45 mol% KF (FLiNaK), a high-temperature low viscosity liquid, was measured and the results agreed with the theoretical values estimated from pure substances relations. Viscosity of the SiO_2-Na_2O-NaF system (C_(Na2O)/C_(SiO2) = 0.67 in mol%) was obtained by varying concentration range from 0 to 80 mol% NaF. All melts' composition tested followed Arrhenius-type temperature dependence, and a viscosity relation at 1 473 K based on composition was also obtained. Drastic decreases in activation energy for viscous flow were observed at the concentrations of 5 and 80 mol% NaF.
机译：作者先前开发的旋转坩埚粘度计已得到改进，以便以高可靠性测量宽范围的粘度值。为了实现这一目的，采用了两组具有不同几何形状的内圆柱和坩埚。这些部件的中心采用X-Y平台进行定位，精度达到±0.1 mm。扭矩测量的相对误差小于1.5％，并且所有实验的校准曲线均具有良好的一致性。通过使用改进的粘度计，测量了典型的熔融盐，即高温低粘度液体LiF-10 mol％NaF-45 mol％KF（FLiNaK），其结果与从纯物质关系估算的理论值相符。 SiO_2-Na_2O-NaF体系的粘度（C_（Na2O）/ C_（SiO2）= 0.67 in mol％）通过从0到80 mol％NaF改变浓度范围获得。所有测试的熔体组成均遵循Arrhenius型温度依赖性，并且还获得了基于组成的1473 K时的粘度关系。在浓度为5和80 mol％的NaF时，粘滞流动的活化能急剧下降。

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