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Wide-band oxygen sensor electrode

An oxygen sensor and electrode technology, which is applied in the field of oxygen sensors, can solve problems such as sensor failure and oxygen pump impedance increase, and achieve the effects of stable and accurate signal measurement, good adhesion, and excellent thermal shock

Pending Publication Date: 2019-10-18
莱鼎电子材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The signal electrode of the oxygen sensor is a metal-ceramic electrode containing noble metal Pt and some ceramic phases. Considering increasing its electrode activity, it is planned to add some rhodium to enhance the electrode activity. Since the working temperature of the sensor is in the range of 800-900°C, the electrode It must have good activity and must have good thermal shock resistance. Once the electrode cracks or peels off, the impedance of the oxygen pump will increase greatly, which will cause the sensor to fail

Method used

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Embodiment Construction

[0023] A wide-area oxygen sensor electrode such as figure 1 It is a schematic diagram of the electrode structure layer of the wide-area oxygen sensor. The chip structure shown includes a diffusion barrier layer 111, a signal layer 112 and a heating layer 113, which are stacked sequentially from top to bottom and then sintered, as shown in figure 2 It is a schematic diagram of the structure of the wide-area oxygen sensor electrode test chip. The diffusion barrier layer 111 is a porous diffusion barrier 1 structure that is not affected by the slit diffusion barrier 1; the signal layer 112 includes the active electrode 2, zirconia The substrate 4 and the internal electrode 5 are provided with a first insulating layer 3 at the same horizontal plane as the activated electrode 2, and a second insulating layer 6 is provided at the same horizontal plane as the internal electrode 5. connected; the heating layer 113 includes a reference gas channel 7, a heating electrode 9 and a heater...

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Abstract

The invention discloses a wide-band oxygen sensor electrode. The technical scheme key point of the wide-band oxygen sensor electrode is that the chip structure of the wide-band oxygen sensor electrodecomprises a diffusion barrier layer, a signal layer and a heating layer, and the diffusion barrier layer, the signal layer and the heating layer are sintered after being overlapped in sequence from top to bottom to form the chip structure of the wide-band oxygen sensor electrode. The wide-band oxygen sensor electrode adopts a particular preparation method to prepare activated electrode slurry through the regulation of the contents of substances, including Pt, Rh, ZrO2, glass binder and the like. The electrode of the wide-band oxygen sensor electrode exhibits good adhesive force with a zirconium oxide matrix, so that the electrode has excellent thermal shock, and the designed particular wide-band oxygen sensor structure enables the signal measurement of the wide-band oxygen sensor to be stable and accurate.

Description

technical field [0001] The invention relates to the field of oxygen sensors, more specifically, it relates to a wide-area oxygen sensor electrode. Background technique [0002] The signal electrode of the oxygen sensor is a metal-ceramic electrode containing noble metal Pt and some ceramic phases. Considering increasing its electrode activity, it is planned to add some rhodium to enhance the electrode activity. Since the working temperature of the sensor is in the range of 800-900°C, the electrode It must have good activity and must also have good thermal shock resistance. Once the electrode cracks or peels off, the impedance of the oxygen pump will greatly increase, which will cause the sensor to fail. [0003] We adjust the Pt, Rh, ZrO 2 , glass binder and other substances can prepare activated electrode slurry, design a certain oxygen sensor structure to detect the activity of the electrode, test the change of catalytic activity through the durability test, and select th...

Claims

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Application Information

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IPC IPC(8): G01N27/30
CPCG01N27/30
Inventor 黄海琴陈圣龙朱卫兵陶建兵韩旭宋能昊
Owner 莱鼎电子材料科技有限公司
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