CaF_2--SiO_2型硅传感器辅助电极的制备及其定硅性能  

Preparation and property of silicon sensor auxiliary electrodes based on the CaF_2- SiO_2 system

作　　者：鞠靓辰 李杨[1] 满文宽 郭敏[1] 张梅[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《工程科学学报》2016年第4期476-483,共8页Chinese Journal of Engineering

基　　金：国家科技支撑计划资助项目(2013BAC14B07)

摘　　要：以CaF_2＋SiO_2作为硅传感器辅助电极材料,将其均匀涂覆于ZrO_2（MgO）固体电解质表面,在高纯Ar气保护下,1400℃焙烧30min制备得到定硅传感器.利用X射线衍射仪、扫描电子显微镜以及能量色散谱仪系统研究了制备条件对于焙烧后形成的辅助电极膜层组成、物相和微观形貌的影响.膜层中不存在CaF2,而是以SiO2固体颗粒、CaO·MgO·2SiO_2固溶体及ZrSiO_4为主.另外,探讨了辅助电极膜层中物相的变化对于膜层黏结性以及定硅性能的影响.在1450℃下对铁液中硅含量进行测试,传感器响应时间在10s左右,稳定时间在20s以上,而且传感器的重复性也很理想.当铁液中硅质量分数在0.5%~1.5%时,硅传感器测量值与化学分析法分析值相吻合.A silicon sensor auxiliary electrode was successfully synthesized by evenly coating Ca F2＋ Si O2 powder on the surface of Zr O2（ Mg O） solid electrolyte and roasting at 1400 ℃ for 30 min in high purity Ar atmosphere. The effects of preparing conditions on the composition,crystal phase and morphology of the formed auxiliary electrode membrane after calcination were systematically investigated by X-ray diffraction,scanning electron microscopy and energy dispersive spectrometry. It is shown that Si O2 solid particles,Ca O·Mg O·2Si O2 solid solution and Zr Si O4 are the main components of the formed auxiliary electrode layer and no Ca F2 exists in the layer. In addition,the influences of phase transformation on the film adhesive property and silicon sensor performance were also discussed. The as-prepared silicon sensor which is used to detect silicon content in molten iron at 1450 ℃ shows a better performance.When the silicon content ranges from 0. 5% to 1. 5% in liquid iron,the testing result based on this silicon sensor with a response time of 10 s and a steady time more than 20 s agrees well with the value based on the chemical analysis method.

关 键 词：硅传感器 电极 制备方法 硅含量 氟化钙 二氧化硅 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]