定氧电池氧化锆电解质中的氧位分布与参比电极的选择

DISTRIBUTION OF OXYGEN POTENTIAL IN ZrO_2 BASED SOLID ELECTROLYTE AND SELECTION OF REFERENCE ELECTRODE

用稳态法求得氧化锆固体电解质内的氧位分布，从理论上阐明了钢液定氧电池参比电极的选择原则。在１６００℃下，钢液含氧量小于３００×１０^（－６）时，Ｃｒ／Ｃｒ_２Ｏ_３参比电极优于Ｍｏ／ＭｏＯ_２参比电极；而钢液含氧量大于３００×１０^（－６）时，使用Ｍｏ／ＭｏＯ_２，参比电极比Ｃｒ／Ｃｒ_２Ｏ_３参比电极的误差更小。氧含量极低时，不宜采用Ｍｏ／ＭｏＯ_２作参比电极。

The principle for selecting reference electrode of solid electrolyte oxygen cell was explained by the distribution formula of oxygen potential in ZrO_2 based solid electrolyte and this formula was evaluated under steady-state conditions,Cr/Cr_2O_3 reference electrode is better than Mo/MoO_2 reference electrode in the measurement of steel melts with oxygen content lower than 300×10￣6.Use of Mo/MoO_2 reference electrode can accurately measure steel melts with oxygen content higher than 300×10￣(-5)but can not be used to measure steel melts with extremely low oxygen content.