GAS SENSOR ELEMENT, GAS SENSOR, AND MANUFACTURING METHOD OF GAS SENSOR ELEMENT

• Main Authors: KAMATA KENTARO, SUZUKI YOSUKE, KOJIMA AKIYOSHI, FURUTA SAI
• Format: Patent
• Language: English; Japanese
• Published: 13.03.2023
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

To provide a gas sensor element including a gas introduction part inhibiting generation of defects such as cracks.SOLUTION: A frame-like body includes: a gas introduction part 151 composed of porous ceramic, with an end 151a arranged outside and an end 151b arranged at a space 150a side; and a ceramic structure 100C composed of fine ceramic, a peripheral wall part surrounding the space 150a with the gas introduction part 151. A gap 150b connecting to the space 150a is formed between an opposing face 151b1 opposing a ceramic structure 100B, of the end 151b of the gas introduction part 151, and the ceramic structure 100B. A gas sensor element 10 includes ceramics formed of a material having contraction start temperature lower than that of the material for forming the gas introduction part 151, and comprises a buffer layer 300 formed on the opposing face 151b1 so as to, when viewed from a lamination direction, overlap with a boundary X between an edge 150b1 on the outer side of the gap 150b and the ceramic structure 100B.SELECTED DRAWING: Figure 6 【課題】亀裂等の欠陥が抑制されたガス導入部を含むガスセンサ素子等の提供。【解決手段】枠状体は、端部１５１ａが外部側に配置されると共に端部１５１ｂが空間１５０ａ側に配置される多孔質セラミックからなるガス導入部１５１と、緻密なセラミックからなり、ガス導入部１５１と共に空間１５０ａを取り囲む周壁部とを含むセラミック構造体１００Ｃと、を備える。ガス導入部１５１の端部１５１ｂのうち、セラミック構造体１００Ｂと対向する対向面１５１ｂ１と、セラミック構造体１００Ｂとの間に、空間１５０ａと繋がった隙間１５０ｂが形成される。ガスセンサ素子１０は、ガス導入部１５１を形成するための材料よりも収縮開始温度が低い材料からなるセラミックからなり、積層方向から見た場合に、隙間１５０ｂの外部側の縁１５０ｂ１とセラミック構造体１００Ｂとの境界部Ｘと重なるように、対向面１５１ｂ１に形成される緩衝層３００を備える。【選択図】図６