Quantitative Analysis for Crystallinity of Super-cooled Oxide Melt Characterized by Electrical Capacitance Measurement

2014 Fiscal Year Final Research Report

• Project/Area Number: 25630339
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Metal making/Resorce production engineering
• Research Institution: Kyushu University
• Principal Investigator: SAITO Noritaka 九州大学, 工学(系)研究科(研究院), 准教授 (80432855)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 電気容量 / 酸化物融体 / 結晶化 / 結晶化率 / 粘性

Outline of Final Research Achievements

A novel- and in situ- quantifying method for the crystallinity of super-cooled silicate melts was proposed by the measurement of their electrical capacitance. It is well known that the electrical capacitance of ionic liquids is generally much higher than that of solids. These differences were exploited as a sensitive indicator of the crystallization of silicate melts in an experimental furnace equipped with an electrical capacitance measuring system. For the calibration of electrode composition employed, a theoretical capacitance model based on the dimensions of electrodes was proposed. For the estimation of crystallinity in super-cooled silicate melts, Nielsen’s equation was employed, which can allow us to calculate the dielectric constant of silicate-based suspension. Consequently, the calculated capacitance values successfully reproduced the experimental values at h.t., which suggests capacitance can provide crystallinity of silicate melt at elevated temperature.

Free Research Field

融体物理化学