APPLICATION OF HYDROGEN SENSOR USING PROTON CONDUCTIVE CERAMICS AS A SOLID-ELECTROLYTE TO ALUMINUM CASTING INDUSTRIES

A galvanic cell type of hydrogen sensor was developed using CaZrO2-bas ed proton conductor as a solid electrolyte. It was clear that the hydr ogen sensor could be used for the accurate determination of hydrogen c oncentration in molten aluminum alloys. The sensor probe exhibited sta ble EMF values and a fast response when the hydrogen concentration in the melt was changed. The application of this sensor to the real alumi num foundry was also investigated. This sensor could work very stably even when the flow rate of the liquid metal was very fast. In situ mea surement was possible using this sensor anywhere in the casting shop, such as melting furnace, holding furnace, the degassing station, etc.