Method for preparing dense diffusion barrier of limiting current type oxygen sensor with co-permeation method

A limiting current type, oxygen sensor technology, applied in the field of sensors, can solve the problems of long cycle, cumbersome preparation process, unevenness, etc., and achieve the effects of short production cycle, high sensitivity, and low thermal expansion difference
CN105948747AActive Publication Date: 2016-09-21NORTHEASTERN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHEASTERN UNIV
Publication Date
2016-09-21

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Abstract

The invention belongs to the technical field of sensors, and particularly relates to a method for preparing a dense diffusion barrier of a limiting current type oxygen sensor with a co-permeation method. The method comprises steps as follows: La2O3, SrCO3, Ga2O3 and MgO are taken as raw materials, a La0.8Sr0.2Ga0.83Mg0.17O2.815 sheet is prepared with a solid-phase synthesis method, the La0.8Sr0.2Ga0.83Mg0.17O2.815 sheet is arranged at the lower part of a forming die, the upper part of the forming die is filled with transition metal oxide powder, pressure is kept for 5-10 min under the pressure intensity of 6-10 MPa, then sintering is performed for 5-50 h at the temperature of 1,400-1,600 DEG C, and after natural cooling, the dense diffusion barrier of the limiting current type oxygen sensor is obtained. The dense diffusion barrier prepared with the method is dense, uniform and pore-free in structure and firm in combination, the thermal expansion difference between a matrix and the dense diffusion barrier is reduced to the minimum, and the dense diffusion barrier has the advantages of short preparation period and high sensitivity.
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Description

Technical field

[0001] The invention belongs to the technical field of sensors, and specifically relates to a method for preparing a dense diffusion barrier layer of a limiting current type oxygen sensor by a co-permeation method. Background technique

[0002] The furnaces of iron and steel metallurgical enterprises consume a lot of energy. In order to save energy and optimize the combustion of heating furnaces, it is necessary to strictly control the air-fuel ratio in the thermal system. Only a reasonable air-fuel ratio can achieve a higher combustion temperature and improve energy utilization. It is a direct and effective method to use the electrochemical oxygen sensor to detect the oxygen content in the furnace gas in real time and online.

[0003] Electrochemical oxygen sensors are divided into concentration battery type and limiting current type. Compared with concentration battery type oxygen sensors, limiting current type oxygen sensors have a wide measuring range, short res...

Claims

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