固相辅助电极型传感器的物理模型  

Physical Model of a Solid Auxiliary Electrode Silicon Sensor

作　　者：王青松[1] 

机构地区：[1]北京科技大学材料科学与工程学院

出　　处：《北京科技大学学报》2004年第1期38-41,共4页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助课题(No.59874016)

摘　　要：用研制的Mg2SiO4(s)+MgO(s)硅传感器,对高碳冶金熔液中的硅进行了测量,发现辅助电极的物相结构和熔体中的氧含量对测量结果有明显的影响.首先提出了辅助电极型传感器的物理模型,导出了辅助电极的局域平衡氧势与熔体氧势和硅传感器测量结果的关系式,给出了覆盖常数和结构常数的物理意义.用实验数据拟合得到了该传感器的结构常数为6.66;用该模型对小于1的不同覆盖常数的硅传感器测得同一熔体的氧势进行了校正,得到了一致的局域平衡氧势值,证明了模型与实际吻合得相当好.The silicon in high carbon metallurgical melt was tested with a developed Mg2SiO4(s)+MgO(s) silicon sensor. It was found that the phase construction of the auxiliary electrode and the oxygen component in the melt has an obvious effect on the measuring result. A physical model of this silicon sensor was proposed at the first time. The expression of local equilibrium silicon-oxygen potential, related to the oxygen potential of the melt and directly measured results, was derived. The physical meanings of coverage constant and structure constant were described. The structure constant was calculated to be 66.6 by means of fitting the experimental data. The measured oxygen potental, obtained with different silicon sensors whose coverage constant is less than 1, was corrected with the derived expression. The values of local equlibrium oxygen potential are the same. This testified that the physical model conforms to the practice.

关 键 词：辅助电极 硅传感器 物理模型 氧化镁 硅酸镁 元素活度 冶金熔体 

分 类 号：TF1[冶金工程—冶金物理化学] TP212[自动化与计算机技术—检测技术与自动化装置]