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，通过测量测量氢溶解度，总导电率和电子电导率来研究要使用的质子导电固体电解质的电化学性能。通过这些测量值，可以证实Cazro_3（+IN_2O_3）的质子导电域延伸到更高的温度区域，而Srceo_3（YB_2O_3）的温度区域延伸到更高的温度区域。然后，使用该材料作为电解质和该传感器的性能，构建了基于氢浓度细胞的熔融铝的氢传感器。当设计细胞以测量与熔融金属平衡的气相的氢电位时，可以准确测量熔融铝中的氢电位。还研究了熔融铜的相似类型的氢传感器。发现插入型传感器可用于熔融铜。但是，在这些高温和高氧电位中，由于正孔电导的出现，EMF值偏离了理论。发现同时测量氧势是评估熔融铜中正确的氢电位所必需的。还开发了一种评估金属中氢活性的设备。该设备基于Sieverts的方法，其中使用相同的质子反应性固体电解质在电化学上确定氢的部分压力。还研究了该设备的性能。因此，在该研究项目开始时计划的所有项目都成功完成了。