Determination of the P _e value of 5 wt-% calcia stabilised hafnia solid electrolyte at high temperatures

Authors: Mutale, C.T.; Pistorius, P.C.

Source: Ironmaking & Steelmaking, Volume 31, Number 3, June 2004 , pp. 269-272(4)

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Abstract:

In the context of the measurement of oxygen activities at high temperatures in ironmaking and steelmaking, the P_e value of a 5 wt-% calcia stabilised hafnia long tube was determined by the coulometric titration technique at high temperature. According to values obtained in this paper, the P_e value could be expressed as: logP_e = (–66 468/ T) + 17.97 for temperatures between 1400 and 1620°C. This is similar to values published in the literature. It was also discovered that the chemical composition of the solid electrolyte as well as the oxygen partial pressure inside the hafnia tube has an influence on the P_e value. Therefore, it is necessary to measure the P_e value of solid electrolytes prior to their use in steelmaking.In the context of the measurement of oxygen activities at high temperatures in ironmaking and steelmaking, the P_e value of a 5 wt-% calcia stabilised hafnia long tube was determined by the coulometric titration technique at high temperature. According to values obtained in this paper, the P_e value could be expressed as: logP_e = (–66 468/ T) + 17.97 for temperatures between 1400 and 1620°C. This is similar to values published in the literature. It was also discovered that the chemical composition of the solid electrolyte as well as the oxygen partial pressure inside the hafnia tube has an influence on the P_e value. Therefore, it is necessary to measure the P_e value of solid electrolytes prior to their use in steelmaking.

Keywords: PARTIAL PRESSURE; OXYGEN SENSORS; SOLID ELECTROLYTES; HAFNIA; CALCIA

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/030192304225018064

Publication date: 2004-06-01

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