| 摘要 |
A gas sensor (1) which can be an air-fuel ratio sensor includes a detection element (71) including a pair of electrodes, one of the paired electrodes being a sensing electrode (87) which is exposed to a gas-to-be-measured, and the other electrode being a reference electrode (95) which functions as an oxygen reference electrode. In the gas sensor (1), the reference electrode (95) is connected to a porous reference electrode lead (97) extending along the surface of a solid electrolyte body (77); the reference electrode lead (97) contains a noble metal as a main component and also contains a ceramic material; and the reference electrode lead (97) has a specific resistance lower than that of the reference electrode (95). The ceramic material has, in a sintered state, a mean primary grain size greater than that of the noble metal. |
| 主权项 |
1. A gas sensor comprising:
a detection element, the detection element including a solid electrolyte body having a plate form, and a pair of electrodes formed on opposite sides of the solid electrolyte body, one of the paired electrodes being a sensing electrode which is exposed to a gas-to-be-measured, and the other electrode being a reference electrode which functions as an oxygen reference electrode, wherein: the reference electrode is connected to a porous reference electrode lead extending along a surface of the solid electrolyte body; the reference electrode lead contains a noble metal as a main component and also contains a ceramic material; the reference electrode lead has a specific resistance lower than that of the reference electrode; and the ceramic material has, in a sintered state, a mean primary grain size greater than that of the noble metal. |
