SENSOR ELEMENT AND GAS SENSOR

摘要

In a sensor element 101, a fourth diffusion rate-controlling portion 54 includes a diffusion rate-controlling portion 54a. The diffusion rate-controlling portion 54a is formed between one or more and three or less surfaces, e.g., an upper surface 58a, of upper, lower, left and right inner peripheral surfaces of a measurement-object gas flowing portion and a partition wall 56. A measurement electrode 44 is formed on one, e.g., a lower surface 62b, of upper, lower, left and right inner peripheral surfaces of a third inner cavity 61, the one surface being different in orientation from the surface along which the diffusion rate-controlling portion 54a is formed. The diffusion rate-controlling portion 54 and the measurement electrode 44 may be formed on surfaces opposite to each other. A distance L between the measurement electrode 44 and the diffusion rate-controlling portion 54a may be 0.1 mm or more.

主权项

1. A sensor element comprising:
a layered body that is formed by stacking a plurality of oxygen ion-conductive solid electrolyte layers, and that includes a measurement-object gas flowing portion formed therein to introduce measurement object gas from outside, a measurement electrode mounting space that is a part of the measurement-object gas flowing portion, and that is partitioned from an inflow side of the measurement object gas by a partition wall, at least one diffusion rate-controlling portion that is a part of the measurement-object gas flowing portion, that is formed, assuming a direction in which the solid electrolyte layers are stacked to be an up and down direction and a direction perpendicular to both the up and down direction and a direction in which the measurement object gas flows to be a right and left direction, between one or more and three or less surfaces of upper, lower, left and right inner peripheral surfaces of the measurement-object gas flowing portion and the partition wall, and that serves as a flow path through which the measurement object gas is introduced to the measurement electrode mounting space, and; a measurement electrode that is formed on one of upper, lower, left and right inner peripheral surfaces of the measurement electrode mounting space, the one surface being different in direction from the surface along which the diffusion rate-controlling portion is formed.