公开(公告)号：US20220236210A1

公开(公告)日：2022-07-28

申请号：US17577423

申请日：2022-01-18

Applicant: NGK Insulators, Ltd.

Inventor： Takayuki SEKIYA ,  Yusuke WATANABE ,  Shiho IWAI

IPC: G01N27/409 ,  G01N27/41 ,  G01N27/417 ,  G01N27/407

Abstract: A sensor element includes a base part containing a solid electrolyte as a constituent material; at least one internal space into which a measurement gas is introduced; and at least one pump cell including an internal space electrode disposed to face the internal space, an out-of-space pump electrode disposed at a location other than the internal space, and a portion of the base part located between these electrodes, the internal space electrode includes a noble metal, the solid electrolyte, and a pore, and, in the internal space electrode, a ratio of a length of a boundary of a first region formed of the base part or the solid electrolyte contiguous with the base part and a second region occupied by the noble metal and the pore to a length of a boundary of the solid electrolyte and the internal space electrode is 1.1 or more.

公开(公告)号：US20250003920A1

公开(公告)日：2025-01-02

申请号：US18883280

申请日：2024-09-12

Applicant: NGK INSULATORS, LTD.

Inventor： Shiho IWAI ,  Sotaro INAGAKI ,  Ryota TOMIOKA ,  Takayuki SEKIYA

IPC: G01N27/407 ,  G01N33/00

Abstract: A sensor element for detecting a target gas to be measured in a measurement-object gas includes: a base part in an elongated plate shape, including an oxygen-ion-conductive solid electrolyte layer; a measurement-object gas flow part formed from one end part in a longitudinal direction of the base part; an inner main pump electrode disposed on an inner surface of the measurement-object gas flow part; a porous coating layer covering at least an electrode end part of the inner main pump electrode closer to the one end part in the longitudinal direction of the base part; and a measurement electrode disposed at a position farther from the one end part in the longitudinal direction of the base part than the inner main pump electrode on the inner surface of the measurement-object gas flow part.

公开(公告)号：US20220317084A1

公开(公告)日：2022-10-06

申请号：US17694996

申请日：2022-03-15

Applicant: NGK INSULATORS, LTD.

Inventor： Kana IBATA ,  Yusuke WATANABE ,  Shiho IWAI ,  Takayuki SEKIYA ,  Yosuke NORITAKE ,  Daichi KONDO

IPC: G01N27/407 ,  G01N27/406 ,  G01N27/419 ,  H05B3/14 ,  H05B1/02

Abstract: A ceramic heater is provided in an electronic component, and by supplying electrical current thereto, a heat generating portion thereof is heated to a temperature of greater than or equal to 700[° C.] and less than 950[° C.]. An energizing current waveform of the electrical current to the heat generating portion is a pulse waveform, and a product of a pulse voltage Vp [V] and a period T [ms] of the pulse waveform is less than or equal to 600 [V·ms].

公开(公告)号：US20210302362A1

公开(公告)日：2021-09-30

申请号：US17189295

申请日：2021-03-02

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Kengo TERASAWA ,  Shiho IWAI

IPC: G01N27/41 ,  G01N27/407

Abstract: In a sensor element for a limiting-current type gas sensor measuring concentration of NOx in a measurement gas, an inner pump electrode located to face a first internal space communicating with a gas inlet through which the measurement gas is introduced from an external space under predetermined diffusion resistance is made of a cermet of a Pt—Au alloy and zirconia, and the inner pump electrode is located, from among surfaces defining the first internal space, at least on a surface farthest from a heater part in a thickness direction of the element, and is not located on a surface closest to the heater part in the thickness direction.

公开(公告)号：US20210063344A1

公开(公告)日：2021-03-04

申请号：US16996032

申请日：2020-08-18

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Shiho IWAI

IPC: G01N27/407 ,  G01N33/00 ,  G01N27/41

Abstract: In a sensor element for a limiting-current type gas sensor measuring concentration of NOx in a measurement gas, an inner pump electrode located to face a first internal space communicating, under predetermined diffusion resistance, with a gas inlet through which a measurement gas is introduced from an external space is made of a cermet of a Pt—Au alloy and zirconia, and includes a first portion located on a surface farther from a heater part and a second portion located on a surface closer to the heater part from among surfaces opposing each other in the first internal space, an Au content with respect to the Pt—Au alloy as a whole of the second portion is 0.3 wt % or more smaller than that of the first portion, and a total area of the first portion and the second portion is 10 mm2 to 25 mm2.

公开(公告)号：US20240377350A1

公开(公告)日：2024-11-14

申请号：US18783522

申请日：2024-07-25

Applicant: NGK INSULATORS, LTD.

Inventor： Sotaro INAGAKI ,  Shiho IWAI ,  Ryota TOMIOKA ,  Takayuki SEKIYA

IPC: G01N27/41 ,  G01N27/407

Abstract: A sensor element includes: a base part in an elongated plate shape; a measurement-object gas flow part formed from one end part in a longitudinal direction of the base part; an inner main pump electrode disposed on an inner surface of the measurement-object gas flow part; an outer pump electrode disposed in correspondence with the inner main pump electrode; and a measurement electrode disposed at a position farther from the one end part than the inner main pump electrode on the inner surface of the measurement-object gas flow part. The outer pump electrode is disposed at a position farther from the one end part in the longitudinal direction of the base part than one electrode end of the inner main pump electrode closer to the one end part in the longitudinal direction of the base part, with respect to the longitudinal direction of the base part.

公开(公告)号：US20220236212A1

公开(公告)日：2022-07-28

申请号：US17577426

申请日：2022-01-18

Applicant: NGK Insulators, Ltd.

Inventor： Takayuki SEKIYA ,  Yusuke WATANABE ,  Shiho IWAI

IPC: G01N27/409 ,  G01N33/00 ,  G01N27/41 ,  G01N27/417 ,  G01N27/407

Abstract: A sensor element includes: a base part containing an oxygen-ion conductive solid electrolyte as a constituent material; at least one internal space into which a measurement gas is introduced; and at least one pump cell including an internal electrode disposed to face the internal space, an out-of-space pump electrode disposed at a location other than the internal space, and a portion of the base part located between these electrodes, the internal electrode includes a noble metal, the solid electrolyte, and a pore, and, in the internal electrode, a degree of variation of a boundary of a first region formed of the base part or the solid electrolyte contiguous with the base part and a second region occupied by the noble metal and the pore in a thickness direction of the element is 0.5 μm or more and 6.5 μm or less.

公开(公告)号：US20190154629A1

公开(公告)日：2019-05-23

申请号：US16251148

申请日：2019-01-18

Applicant: NGK INSULATORS, LTD.

Inventor： Shiho IWAI ,  Takeya MIYASHITA

IPC: G01N27/419 ,  G01N27/407 ,  G01N33/00

Abstract: A manufacturing method for a sensor element includes a forming step. The forming step includes: a step (a) of forming an unfired electrode on one of plural green sheets; a step (b) of forming an unfired electrode lead and an unfired lead insulating layer on the same green sheet as in the step (a), the unfired electrode lead and to be connected to the unfired electrode, the unfired lead insulating layer surrounding at least part of the unfired electrode lead; and a step (c) of forming an unfired bonding layer so as to fill at least part of a region without the unfired lead insulating layer on the green sheet subjected to the step (b) and so as to overlap at least part of an edge portion of the unfired lead insulating layer.

公开(公告)号：US20220236211A1

公开(公告)日：2022-07-28

申请号：US17577425

申请日：2022-01-18

Applicant: NGK Insulators, Ltd.

Inventor： Takayuki SEKIYA ,  Yusuke WATANABE ,  Shiho IWAI

IPC: G01N27/409 ,  G01N27/41 ,  G01N33/00

Abstract: A sensor element includes: a base part containing an oxygen-ion conductive solid electrolyte as a constituent material; at least one internal space into which a measurement gas is introduced; and at least one pump cell including an internal electrode disposed to face the at least one internal space, an out-of-space pump electrode disposed at a location other than the at least one internal space, and a portion of the base part located between these electrodes, the internal electrode includes: an upper layer consisting of a noble metal, the solid electrolyte, and a pore; and a lower layer consisting of the noble metal and the solid electrolyte, and a volume ratio of the solid electrolyte in the lower layer is greater than a volume ratio of the solid electrolyte in the upper layer.

公开(公告)号：US20200309729A1

公开(公告)日：2020-10-01

申请号：US16819925

申请日：2020-03-16

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Shiho IWAI

IPC: G01N27/409 ,  G01N27/407 ,  G01N27/41 ,  G01N27/30 ,  G01N27/419

Abstract: A gas sensor includes a sensor element, a detection device, a reference gas regulating device. The sensor element includes an element body having disposed therein a measurement-object gas flow section, a measurement-object-gas-side electrode disposed in or out of the element body, a reference electrode disposed within the element body, and a reference gas introducing section that allows a reference gas to be introduced thereinto and to flow therethrough to the reference electrode. The reference gas regulating device allows an oxygen pump-in current to flow between the reference electrode and the measurement-object-gas-side electrode to pump oxygen into around the reference electrode from around the measurement-object-gas-side electrode. A ratio R1/R2 of a reaction resistance R1 of the reference electrode to a diffusion resistance R2 of the reference gas introducing section is greater than or equal to 0.1 and less than or equal to 2.0.