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Measurement of Hydrogen Content in Molten Metal by electrochemical cell based on oxide proton conductor.

基于氧化物质子导体的电化学电池测量熔融金属中的氢含量。

基本信息

批准号：
04453057
负责人：
FUKATSU Norihiko
金额：
$ 2.94万
依托单位：
Nagoya Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

At first, the electrochemical properties of the proton-conductive solid electrolyte to be used, CaZrO_3(+In_2O_3), were investigated by measuring the hydrogen solubility, the total conductivity, and the electronic conductivity. By these measurements, it was confirmed that the protonic-conductive domain of CaZrO_3(+In_2O_3) extends to the higher temperature region than that of SrCeO_3(Yb_2O_3). Then, the hydrogen sensor for molten aluminum based on the hydrogen concentration cell was constructed by using this material as the electrolyte and the performance of this sensor was investigated. The accurate measurement of the hydrogen potential in molten aluminum is possible when the cell was designed to measure the hydrogen potential of the gas phase equilibrated with the molten metals.The similar type of hydrogen sensor for molten copper was also studied. It was found that the insertion-type sensor operates well for molten copper. But, in these high temperature and high oxygen potential, the EMF values deviate from the theoretical one owing to the appearance of positive hole conductance. The simultaneous measurement of oxygen potential was found to be necessary to evaluate the correct hydrogen potential in molten copper.An apparatus to evaluate the hydrogen activity in metals were also developed. This apparatus is based on Sieverts' method, where the partial pressure of hydrogen is determined electrochemically using the same proton-coductive solid electrolyte. The performance of this apparatus were also studied.Consequently, all the items planned in the start of this research project were accomplished successfully.

首先，通过测量氢溶解度、总电导率和电子电导率来研究所要使用的质子传导固体电解质CaZrO_3（+In_2O_3）的电化学性质。通过这些测量，证实了CaZrO_3（+In_2O_3）的质子导电畴比SrCeO_3（Yb_2O_3）的质子导电畴向高温区扩展。以该材料为电解质，构建了基于氢浓差电池的铝液氢传感器，并对其性能进行了研究。设计了测量与金属液平衡的气相氢势的氢势池，使铝液氢势的准确测量成为可能，并研究了类似的铜液氢势传感器。结果表明，插入式传感器对铜液的检测效果良好。但是，在高温高氧势下，由于空穴电导的出现，电动势值偏离理论值。为了准确地测定铜液中的氢势，必须同时测定氧势，并研制了一套测定金属中氢活度的装置。该装置基于Sieverts方法，其中使用相同的质子传导固体电解质以电化学方式确定氢的分压。并对该装置的性能进行了研究，顺利完成了本课题的前期计划。