OXYGEN SENSOR USING ZIRCONIA CONTAINING SCANDIUM OXIDE

摘要

PURPOSE: To provide a zirconia solid electrolyte internal vessel containing Sc₂O₃ as an improved zirconia oxygen sensor which permits stable measurement of oxygen potential of alloys or molten metals having low melting point and low oxygen potential for an extended period. ;CONSTITUTION: A zirconia oxygen sensor, for measuring oxygen potential of alloys or molten metal 5 whose melting point is as low as 350-550°C, comprises a reference electrode 2 forming a system including a metal which shows liquid phase at the temperature of measuring the molten metal 5 or the alloy and the oxides distributed in it, a vessel 1 of zirconia solid electrolyte containing 5-15mol%, Sc₂O₃ of (7-13)mol% desirable, being made to receive the system and contact the molten metal or the alloy, lead wires 3 and 4 connected to either the reference electrode 2 or the molten metal 5 or each alloy and a means 6 for measuring electromotive force between the lead wires 3 and 4. By using the zirconia solid electrolyte interval vessel 1 containing Sc₂O₃, oxygen potential of alloys or the molten metal 5 of low melting point and oxide potential can be stably measured for an extended period, more effectively as a zirconia oxygen sensor.;COPYRIGHT: (C)1993,JPO&Japio