Noncontact electrical resistivity measurement technique for molten metals
Noncontact electrical resistivity measurement technique for molten metals
复制标题
熔融金属非接触电阻率测量技术
DOI：
10.1063/1.1149150
复制
发表时间：
1998
影响因子：
1.6
通讯作者：
T. Ishikawa
中科院分区：
文献类型：
--
作者：
W. Rhim;T. Ishikawa
报道了一种非接触式测量导电液体电导率(或电阻率)变化的技术。这项技术是基于高温静电悬浮器在高真空中悬浮的导电液滴。这项技术利用了异步感应电机的原理，通过对样品施加旋转磁场来测量扭矩随温度的相对变化。使用为感应电机开发的公式，电阻率的变化与测量的扭矩的变化有关。以纯铝熔化温度附近的样品为例，验证了该方法的有效性。当测量结果用熔点电阻率的文献值校准时，我们的熔点附近的电阻率数据可以表示为：在Tm~1160K范围内，rliq=24.19+1.306×10-2(T-TM)µ欧米伽厘米，在700K~Tm范围内，rSolid=10.77+1.421×10-2(T-TM)µOmega cm，根据维德曼-弗朗茨-洛伦兹定律由电阻率数据确定的导热系数由kappaliq(T)=94.61+4.41×10-2(T-TM)Wm-1K-1给出。Kappasolid(T)=211.13-7.57×10-2(T-TM)Wm-1K-1。电阻率和热导率均与文献相符，证实了本方法的有效性。
A noncontact technique of measuring the changes in electrical conductivity (or resistivity) of conducting liquids is reported. The technique is based on a conducting drop that is levitated by the high-temperature electrostatic levitator in a high vacuum. This technique, which utilizes the principle of the asynchronous induction motor, measures the relative changes in torque as a function of temperature by applying a rotating magnetic field to the sample. Changes in electrical resistivity are related to the changes in measured torque using the formula developed for the induction motor. Validity of this technique was demonstrated using a pure aluminum sample around its melting temperature. When the measurement results were calibrated by a literature value of resistivity at the melting point, our resistivity data around the melting point could be expressed by rliq = 24.19 + 1.306 × 10–2(T – Tm) µOmega cm over Tm ~ 1160 K, rsolid = 10.77 + 1.421 × 10–2(T – Tm) µOmega cm over 700 K ~ Tm, and the thermal conductivity as determined by the Wiedemann–Franz–Lorenz law from the resistivity data was given by kappaliq(T) = 94.61 + 4.41 × 10–2(T – Tm) W m – 1 K – 1, kappasolid(T) = 211.13 – 7.57 × 10–2(T – Tm) W m – 1 K – 1. Both electrical resistivity and thermal conductivity are in close agreement with the literature, confirming the validity of the present technique.