| 摘要 |
PURPOSE:To obtain a detecting device of air-fuel ratio having a detecting part which is excellent in a mechanical strength and an insulation strength and also ensures high airtightness between inspection fluids. CONSTITUTION:A detecting device of air-fuel ratio having a detecting part 10 prepared by laminating an exhaust-side electrode 12 and a protective film 14 sequentially on a first surface 111 of a flat-plate-shaped solid electrolyte 11 and laminating an atmosphere-side electrode 13, a flat-plate-shaped support 20 made of alumina, an electric heater 15 and an insulating sheet 16 sequentially on a second surface 112 thereof and by integrating them together. As for the flat-plate-shaped support 20, a ventilating passage 21 communicating with the atmosphere is bored therein and also an atmosphere chamber 22 opening toward the second surface 112 is formed therein. It is preferable that the plate thickness (d) of the flat-plate-shaped support 20 is made 1 to 5mm and the content of alumina 9wt.% or above. |
