Gas sensor element and gas sensor

摘要

There is provided a gas sensor element for detecting the concentration of a specific gas component in gas under measurement, which includes a plate-shaped element body and a porous protection layer. The element body has, at one end portion thereof, a gas sensing portion formed with a solid electrolyte substrate and a pair of electrodes. The porous protection layer has a porous structure formed of ceramic particles and surrounds at least the circumference of the one end portion of the element body. In the present invention, the porous protection layer has an inner region, an intermediate region and an outer region laminated together in order of mention from the element body toward the outside. The intermediate region has a porosity lower than those of the inner and outer regions. There is also provided a gas sensor with such a gas sensor element.

主权项

1. A gas sensor element for detecting the concentration of a specific gas component in gas under measurement, comprising:
a plate-shaped element body having, at one end portion thereof, a gas sensing portion, the gas sensing portion including a solid electrolyte substrate and a pair of electrodes arranged on the solid electrolyte substrate; and a gas-permeable porous protection layer formed of ceramic particles and surrounding at least the circumference of the one end portion of the element body, wherein the porous protection layer has an inner region, an intermediate region and an outer region laminated together in order of mention from the element body toward the outside; and wherein the intermediate region has a porosity lower than those of the inner and outer regions.