公开(公告)号：US20210041409A1

公开(公告)日：2021-02-11

申请号：US16966203

申请日：2019-01-30

Applicant: KOA CORPORATION ,  NAGAOKA UNIVERSITY OF TECHNOLOGY

Inventor： Tomoichiro OKAMOTO ,  Kenichi IGUCHI ,  Ken TAKAHASHI ,  Tetsuro TANAKA ,  Chika ITO

IPC: G01N33/00 ,  G01N27/409 ,  G01N27/407 ,  C04B35/45

Abstract: An oxygen sensor element made of a ceramic sintered body detects oxygen concentration based on an electric current value measured when a voltage is applied. The ceramic sintered body has a composition formula LnBa2-xSrxCu3O7-δ generated by substituting any element selected from group 2 elements in the periodic table, such as strontium (Sr), for a part of a composition formula LnBa2Cu3O7-δ (Ln denotes rare earth element and δ is 0 to 1). Sr substitution quantity x should satisfy an inequality constraint 0

公开(公告)号：US20240272107A1

公开(公告)日：2024-08-15

申请号：US18567069

申请日：2022-06-09

Applicant: NAGAOKA UNIVERSITY OF TECHNOLOGY ,  KOA CORPORATION

Inventor： Tomoichiro OKAMOTO ,  Kenichi IGUCHI ,  Yukiko OTA ,  Ryosuke KOMATSU ,  Tetsuro TANAKA ,  Katsuhide NISHIZAWA

IPC: G01N27/12 ,  G01N33/00

CPC classification number: G01N27/125 ,  G01N33/0036

Abstract: An oxygen sensor element that can achieve electric power saving without losing sensor characteristics has a structure in which an outer surface of a ceramic sintered body as a sensing layer made of a composition LnBa2Cu3O7−δ (Ln denotes rare earth element) is covered with heat insulating layers. A heat insulating material having a composition Ln2BaCuO5 is used for the heat insulating layers, and that composition Ln2BaCuO5 is added with 20 mol % of LnBa2Cu3O7−δ. This allows a sintering behavior of the heat insulating layers to come close to a sintering behavior of the sensing layer, and can thus prevent the occurrence of separation of the layers and cracks. The oxygen sensor element has a sandwich structure where the sensing layer is sandwiched between the heat insulating layers, thereby reducing the amount of heat dissipated from the sensing layer, and making it possible to achieve electric power saving.