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Dipping-type Hydrogen Sensor for Molten Aluminum.

用于熔融铝的浸入式氢传感器。

基本信息

批准号：
62850126
负责人：
OHASHI Teruo
金额：
$ 3.46万
依托单位：
Nagoya Institute of Technology, Faculty of Engineering
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

A research on the application of hydrogen concentration cell based on a new-type proton conductive solid electrolyte SrCe_<0.95>Yb_<0.05>O_3-delta to the analysis of hydrogen in molten aluminum was performed and the following results were obtained. The methods to determine the thermochemical properties such as electrical partial conductivities and transport numbers were established for this electrolyte. The manufacturing technique was achieved and equal quality of electrolytes became to be constantly obtained. The conduction mechanism was investigated by the measurements of the conductivities, the emf's and the polarizing currents of the concentration cells and the hydrogen solubility in the electrolyte. In the relative high oxygen potential regions, the mechanism was made clear sufficiently. The dependency of emf on the oxygen and hydrogen potentials at the electrodes were investigated in detail by using gas concentration cells. The concentration cell immersed into the molten aluminum in the hydrogen atmosphere gave reasonable emf's but those into the melt in the air atmosphere was found not to normally operate. They showed low emf value corresponding to the very high hydrogen potentials and the responses to the changes of atmosphere were not obvious. The more fundamental investigations on the conduction mechanism in very low oxygen potentials and the behaviors of oxide film formed on the interface between electrolyte and melt were found essential to develop the sensors for practical use.

以新型质子导电固体电解质SrCe_<0.95>Yb_<0.05>O_3-delta为基材，进行了氢浓缩电池在铝液氢分析中的应用研究，得到了以下结果：建立了测定该电解质的热化学性质的方法，如电导率和输运数。实现了电解液的制备工艺，不断获得质量相等的电解液。通过测量浓缩电池的电导率、电动势和极化电流以及氢在电解质中的溶解度来研究其导电机理。在相对高氧势区，机理得到了充分的阐明。利用气体浓缩池详细研究了电动势与电极上氧和氢电位的关系。在氢气气氛中浸在铝液中的浓缩电池能给出合理的电动势，而在空气气氛中浸在铝液中的浓缩电池不能正常工作。它们表现出低电动势值，对应于很高的氢势，对大气变化的响应不明显。对极低氧势下的传导机理和电解质与熔体界面上形成的氧化膜的行为进行更基础的研究，是研制实用化传感器的必要条件。