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采用固相合成法制备Sr0.9Y0.1CoO3--δ(SYCO)混合导体和La0.8Sr0.2Ga0.83Mg0.17O2.815(LSGM)固体电解质,利用X射线衍射仪、扫描电子显微镜、能谱仪、热重分析仪、热膨胀仪和碘滴定法对SYCO性能进行了表征。以SYCO为致密扩散障碍层,LSGM为氧泵层,采用瓷片复合法制备出致密扩散障碍层极限电流型氧传感器,研究了温度和氧含量对传感器性能的影响。结果表明:SYCO晶体为立方相Pm3 m空间群结构;SYCO致密扩散障碍层致密且气孔较少,各元素的摩尔比基本符合SYCO的化学计量比;350~1 000℃条件下,SYCO的线膨胀系数为25×10--6/℃;SYCO的非化学计量数δ为--0.143。中低温条件下(600~800℃),氧传感器具有良好的极限电流平台,在700℃(氧含量为0.91%~3.95%)和750℃(氧含量为0.98%~4.00%)条件下,提出了极限电流IL与氧含量关系曲线。
Sr0.9Y0.1CoO3 - δ (SYCO) mixed conductors and La0.8Sr0.2Ga0.83Mg0.17O2.815 (LSGM) solid electrolytes were prepared by solid - state synthesis method and characterized by X - ray diffraction, scanning electron microscopy, , Thermogravimetric analyzer, thermal dilatometer and iodometric titration were used to characterize the SYCO performance. Using SYCO as a diffusion barrier layer and LSGM as an oxygen pump layer, a limiting current oxygen sensor with dense diffusion barrier layer was prepared by a ceramic composite method. The effects of temperature and oxygen content on the sensor performance were studied. The results show that: the SYCO crystal is a cubic phase Pm3 m space group structure; the diffusion layer of SYCO dense diffusion layer is compact with fewer pores, and the molar ratio of each element basically meets the stoichiometric ratio of SYCO; at 350-1000 ℃, SYCO linear expansion The coefficient is 25 × 10--6 / ° C; SYCO’s non-stoichiometric number δ is -0.143. Under the condition of low temperature (600 ~ 800 ℃), the oxygen sensor has a good limit current platform and is proposed under the conditions of 700 ℃ (oxygen content of 0.91% ~ 3.95%) and 750 ℃ (oxygen content of 0.98% ~ 4.00% The limit current IL and oxygen content curve.