| 摘要 |
PURPOSE:To obtain a sensor which is superior in durability, lambda point deviation, and responsiveness and performs accurate air fuel ratio control continuously for a long period by coupling a solid-state electrolyte body with a protection layer tightly by the presence of spherical projection parts. CONSTITUTION:The element 1 consists of the solid-state electrolyte body 2 which generates an oxygen concentration difference between a reference gas and a gas to be measured, a couple of porous electrodes (internal electrode) 3 and (external electrode 4) formed on the internal and external surface of the solid-state electrolyte body 2, the porous protection layer 5 which covers the external electrode 4, a noble metal catalyst 6 dispersed uniformly in the protection layer 5.... Further, the solid-state electrolyte body 4 consists of a base part 2a and spherical projection parts 2b and the external electrode 4 and protection layer 5 are formed in conformity with the shapes of the spherical projection parts 2b. Further, the protection layer 5 consists of a 1st protection layer 5a which is positioned more inside and covers the external electrode 4 directly and a 2nd protection layer 5b which is positioned outside and covers the external electrode 4 directly. The protection layers 5a and 5b carry catalyst 6.... Consequently, the sensor which is superior in durability and responsiveness is obtained. |
