公开(公告)号：US20240328992A1

公开(公告)日：2024-10-03

申请号：US18602459

申请日：2024-03-12

Applicant: NGK INSULATORS, LTD.

Inventor： Katsuya YOSHIDA ,  Ryo HAYASE ,  Takamasa MATSUBARA

IPC: G01N27/407

CPC classification number: G01N27/4077 ,  G01N27/4071 ,  G01N27/4073

Abstract: A sensor element includes: an element body that includes a base part in an elongated plate shape, and a measurement-object gas flow cavity; and a porous protective layer that is formed from one end in the longitudinal direction of the base part and covers a surface of a predetermined length in the longitudinal direction of the element body. The element body includes an extracavity electrode on one principal surface of the element body. The protective layer includes an inner layer and an outer layer; and has an electrode presence region and a posterior region following to the electrode presence region in the longitudinal direction. A porosity in the posterior region of the inner layer is lower than a porosity in the electrode presence region of the inner layer, and a porosity of the outer layer is lower than the porosity in the posterior region of the inner layer.

公开(公告)号：US20200309734A1

公开(公告)日：2020-10-01

申请号：US16829060

申请日：2020-03-25

Applicant: NGK INSULATORS, LTD.

Inventor： Mika KAI ,  Ryo HAYASE

IPC: G01N27/407 ,  G01N33/00

Abstract: A sensor element includes an elongated element body that includes an oxygen-ion-conductive solid electrolyte layer, the element body being in a rectangular parallelepiped shape having a longitudinal direction; a detection unit that has a plurality of electrodes disposed on a front-end side of the element body, and detects a specific gas concentration in a measurement-object gas, the longitudinal direction being a front-rear direction; an outside electrode that is one of the plurality of electrodes and disposed on a first face which is a surface along the longitudinal direction of the element body; and a porous first protective layer that is disposed on the first face and covers the outside electrode. A surface area S of a rear end face of the first protective layer is greater than or equal to 0.9 mm2.

公开(公告)号：US20200309732A1

公开(公告)日：2020-10-01

申请号：US16827753

申请日：2020-03-24

Applicant: NGK INSULATORS, LTD.

Inventor： Takashi HINO ,  Ryo HAYASE

IPC: G01N27/407 ,  G01N33/00

Abstract: A sensor element for a gas sensor includes: an element base being a ceramic structure including a sensing part to sense a gas component to be measured; and a leading-end protective layer being a porous layer to surround a predetermined range from a leading end portion on a side of the sensing part of the element base. The leading-end protective layer protrudes at a first end portion thereof opposite to a portion surrounding the element base in a longitudinal direction of the element base. A/B≥1.1 where A is maximum thickness of the leading-end protective layer, and B is thickness of the leading-end protective layer in a base portion that does not protrude.

公开(公告)号：US20200309730A1

公开(公告)日：2020-10-01

申请号：US16827754

申请日：2020-03-24

Applicant: NGK INSULATORS, LTD.

Inventor： Takashi HINO ,  Atsushi WATANABE ,  Ryo HAYASE

IPC: G01N27/407 ,  G01N27/417 ,  G01N27/406

Abstract: A gas sensor element includes: an element base being a ceramic structure including a sensing part; and a leading-end protective layer being a porous layer disposed around an outer periphery of the element base in a predetermined range on a side of the sensing part. The leading-end protective layer includes: a first layer disposed at least on two main surfaces of the element base; a second layer disposed to cover the end portion and four side surfaces of the element base including the two main surfaces; and a third layer disposed to cover the second layer. The second layer has a porosity of 30% to 80%, and has a thickness of 30 to 50 times thickness of the first layer, and the third layer has a porosity of 15% to 30%, and has a thickness of 5 to 10 times the thickness of the first layer.