Ngk Spark Plug Company, Limited

Takuya Nakatsukasa

Masaki Mizutani

A gas sensor element including: a first ceramic layer () including a solid electrolyte (); a pair of electrode portions () and () at least partially disposed on opposing surfaces of the solid electrolyte; a support member () surrounding a part of an outer peripheral edge of at least one electrode portion () of the pair of electrode portions and having a notch (N), a part of the electrode portion extending in the notch; and a second ceramic layer () disposed on a side where the at least one electrode portion () is present, so as to be in contact with a surface of the support member, the gas sensor element being obtained by stacking the first ceramic layer (), the support member () and the second ceramic layer (), wherein the second ceramic layer covers at least a part of the notch.

Gas sensor element and gas sensor including same

A gas sensor element includes: an element main body including an oxygen concentration detection cell and an oxygen pump cell; and a protective layer that covers the element main body. The element main body includes a heater section. The heater section is a heating element that heats the oxygen concentration detection cell and the oxygen pump cell. The protective layer includes: a first protective layer including a carrier composed mainly of a white ceramic and a noble metal catalyst supported on the carrier; and a second protective layer that is a layer composed mainly of a white ceramic and supporting no noble metal catalyst. The second protective layer externally covers the first protective layer, and a surface of the second protective layer serves as the outermost surface of the protective layer. The thickness of the second protective layer is smaller than the thickness of the first protective layer.

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Nagoya, Japan

Takuya Nakatsukasa