Method for preparing mixed conductor dense diffusion barrier-type oxygen sensor

Abstract

The invention provides a method for preparing a mixed conductor dense diffusion barrier-type oxygen sensor. The prepared oxygen sensor comprises an electrolyte layer, a dense diffusion barrier layer, an encapsulation layer, porous positive and negative collectors and the like. The electrolyte layer is made of a zirconia material; the dense diffusion barrier layer is made of a mixed conductor material consisting of zirconia and La1-xSrxMnO3; the encapsulation layer is made of glass glaze; the electrolyte layer and the dense diffusion barrier layer are formed by direct sintering through spark plasma sintering technology; porous positive and negative collector layers are formed by directly printing the positive and negative collectors on upper and lower surfaces of a composite material through screen printing and sintering the printed positive and negative collectors; and the encapsulation layer is coated at the edge of composite multi-layer ceramic. Due to the adoption of the spark plasma sintering technology, the prepared sensor solves the problems of turn-up, cracking and the like, has the characteristics of good repeatability, stable performance, simple preparation process, shortpreparation period, small volume, quick response and the like, and is suitable for the detection of wide oxygen concentration.

Description

technical field [0001] The invention relates to a preparation method of a mixed conductor dense diffusion barrier oxygen sensor, which is suitable for detecting ZrO2 in a wide range of oxygen concentration 2 Preparation of the base-limiting current oxygen sensor. Background technique [0002] The measurement and control of oxygen concentration plays an important role in various industrial fields, especially in the automobile, metallurgy, and oxygen production industries. The sensors currently in use are divided into two types according to their principles: concentration potential type and limiting current type, and the limiting current type Oxygen sensors are being widely used for their advantages of high precision, fast response, long service life and no need for reference gas during use; limiting current oxygen sensors can be divided into pore diffusion barrier types (including small pore diffusion barrier type, porous Diffusion barrier type) and mixed conductor dense dif...

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Problems solved by technology

However, if the traditional sintering method is used, the prepared zirconia electrolyte ceramics have problems such as poor density and long sintering cycle. However, when the traditional co-firing method is used to prepare the composite ceramics, due to the inconsistency of the thermal shrinkage rate during the sintering process, it will lead to problems such as cracking, warping, and separation of the composite ceramics, which will reduce the tightness of the dense diffusion barrier layer. , which reduces the measuring range of the oxygen concentration of the oxygen sensor

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