Dipping-type Hydrogen Sensor for Molten Aluminum.

研究了基于新型质子导电固体电解质SrCe&lt；0.95&gt；Yb&lt；0.05&gt；O_3-Delta的氢浓缩池在铝熔体氢气分析中的应用。建立了该电解液的部分电导率、输运数等热化学性质的测定方法。实现了制造技术，并不断获得同等质量的电解液。通过对浓差电池的电导率、电动势、极化电流和电解液中氢的溶解度的测量，对其导电机理进行了研究。在氧势相对较高的区域，其机理被充分阐明。利用气体浓差电池详细研究了电极上的氧势和氢势对电动势的依赖关系。在氢气气氛中浸入铝液中的浓差电池产生合理的电动势，而在空气气氛中浸入熔体中的浓差电池不能正常工作。它们表现出与很高的氢势相对应的低电动势，对大气变化的响应不明显。对极低氧势下的导电机理和电解液-熔体界面上形成的氧化膜的行为进行了更基础的研究，这对于开发实用的传感器是必要的。

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.