Manufacturing method of double-layer structure of electrolyte layer and compact diffusion layer for oxygen sensor

Abstract

The invention relates to the technical field of an electrochemical oxygen sensor, in particular to a manufacturing method of a double-layer structure of an electrolyte layer and a compact diffusion layer for an oxygen sensor. A 3D printing technology is used for forming a compact diffusion layer blank on an electrolyte layer blank body / electrolyte layer; or the 3D printing technology is used for forming the compact diffusion layer on the electrolyte layer. Through the application of the 3D printing technology, the tissues of the finally formed compact diffusion layer is compact and uniform; the air pores are obviously reduced; the bonding intensity with the electrolyte layer is high; the heat influence region range and the deformation of the electrolyte layer can be reduced to the minimum degree; cracks cannot easily occur; the performance of the oxygen sensor with the double-layer structure and performance stability are improved. In addition, the width and the thickness of the compact diffusion layer can be precisely controlled; the 3D printing speed is high; the preparation period is short; the method is applicable to large-scale production.

Description

technical field [0001] The invention relates to the technical field of electrochemical oxygen sensors, in particular to a method for manufacturing a double-layer structure of an electrolyte layer and a dense diffusion layer for an oxygen sensor. Background technique [0002] The application of electrochemical oxygen sensors in the detection of oxygen content has attracted more and more attention. Electrochemical oxygen sensors mainly include concentration potential type oxygen sensors and limiting current type oxygen sensors. Among them, the concentration potential type oxygen sensor has disadvantages such as insensitivity to lean-burn zone control. Therefore, the limiting current type oxygen sensor with wider application, more sensitive response, and longer life has attracted much attention. [0003] Limiting current oxygen sensors are divided into small hole type, porous type and dense diffusion barrier layer type. Among them, the small hole type and porous type have defec...

AI Technical Summary

Problems solved by technology

Among them, using spark plasma sintering (SPS) technology, it is easy to cause the sintered body to crack due to the mismatch between the material of the dense diffusion layer and the material of the electrolyte layer during the sintering process, thus affecting the oxygen measurement performance

Using the co-pressing co-sintering method, because the thermal expansion coefficient and sintering shrinkage of the material of the dense diffusion layer and the material of the electrolyte layer do not match, it is easy to cause cracks in the sintered body during the co-sintering process, which affects the diffusion of oxygen ions in the sensor.

Using ceramic composite method, the performance of oxygen measurement is good, but the preparation period of this method is long and the process is cumbersome, and the dense diffusion layer prepared in conventional sintering contains many pores, which is not conducive to large-scale production

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