| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas sensor element in which cracking and wire breaking are unlikely to occur in a conductor layer formed straddling boundaries between an electrolyte portion and an insulation portion of a composite ceramic layer.SOLUTION: A gas sensor element comprises: a composite ceramic layer having an insulation portion 112 and an electrolyte portion 131 arranged within a through-hole 112h; and a first conductor layer 150 formed straddling both a first insulation main surface 113 of the insulation portion 112 and a first electrolyte main surface 133 of the electrolyte portion 131. The electrolyte portion 131 is thinner than the insulation portion 112, and the first electrolyte main surface 133 of the electrolyte portion 131 is located on a thickness-direction DTN inward of the first insulation main surface 113 of the insulation portion 112. The insulation portion 112 has, on a first insulation main surface side, a protrusion portion 122 overlapping the first electrolyte main surface 133 and protruding toward the DR1 within the through-hole 112h. The thickness of the protrusion portion 122 reduces toward the inside of the DR1 within the through-hole 112h. The conductor layer 150 is formed straddling both a protrusion surface 122s on the protrusion portion 122 and the first electrolyte main surface 133.SELECTED DRAWING: Figure 5 |
