Viscosity of Flux for Steel Refining

制作了一台外筒旋转粘度计样机，并在室温下进行了测试。用粘度计测定了Na_2O-B_2O_3和B_2O_3-SiO_2-Na_2O三元体系在约800ﾟ~1100ﾟC温度范围内的粘度。结果表明：(1)该粘度计适用于10℃~10℃，10~(-2)~10~(-2)Pa.S粘度范围的测量。(2)Na_2O-B_2O_3二元熔体的粘度等温线在10mol%Na_2O左右出现极小值，在Na_2O浓度增大时在20ﾟ%左右出现极大值。(3)用B_2O_3-SiO_2-Na_2O三元熔体的BO_3和BO_4之间的平衡关系以及拟三元体系[BO_3]-Na_2O-[SiO_2+BO_4]，可以定量地解释Na_2O-B_2O_3二元熔体粘度等温线的形状。

A prototype outer cylinder rotating viscometer was built, and tested at room temperature. The viscosity of binary Na_2O-B_2O_3 and ternary B_2O_3-SiO_2-Na_2O systems have been measured in the approximate temperature range 800ﾟ to 1100ﾟC by the viscometer. The following results are obtained :(1)The viscometer was suitable for the measurement of the viscosity range from 10^<-2> to 10^2 Pa s, and at a temperature up to 1600ﾟC.(2)Viscosity isotherms of binary Na_2O-B_2O_3 melts showed a minimum value at about 10mol% Na_2O followed by a maximum value at about 20mol% Na_2O as the Na_2O concentration was increased. With increasing temperature, the minimum and the maximum became less prominent.(3)The shape of the viscosity isotherms of binary Na_2O-B_2O_3 melts could be quantitatively explained by an equilibrium between BO_3 and BO_4(4)Iso-viscosity lines of ternary B_2O_3-SiO_2-Na_2O melts, and of pseudo-ternary system [BO_3]-Na_2O-[SiO_2+BO_4] were provided.