Development of electrochemical sensor for rapid measurement of solute activities using mullite solid electrolyte

开发利用莫来石固体电解质快速测量溶质活性的电化学传感器

• 批准号: 05555197
• 负责人: SUITO Hideaki
• 金额: $ 7.55万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05555197/
• 关键词: Mullite; Electrochemical sensor; Solid electrolyte; Liquid iron; Aluminum activity; Silicon activity; Oxygen activity; 起電力; シリコンセンサー; Fe-Si合金; 炭素飽和溶鉄; 酸素センサー; アルミニウムセンサー; センサー; 溶鋼; シリコン

1.It was confirmed from the measurement of formation free energy of oxides (FeO,CoO,NiO) by using tablet of mullite (3Al_2O_3・2SiO_2) that mullite could be used as a solid electrolyte.2.The values for electronic conductivity limits, P_<THETA>, of mullite and ZrO_2-9 mol% MgO solid electrolytes were estimated as log (P_<THETA>/atm)=54.32-137000/T and log (P_<THETA>/atm)=27.16-75500/T,respectively/3.The values for oxygen activity obtained using a mullite or ZrO_2-plug type probe agreed satisfactorily with both those calculated from the Al/Al_2O_3 equilibrium and those estimated from the analyzed oxygen contents. The values for oxygen activity obtained using a ZrO_2-tube type probe were higher than those estimated from the analyzed oxygen contents. A polarization effect in a ZrO_2-tube type probe could not be eliminated in the measurement of low oxygen activity.4.From superaturation experiments, it could be concluded that the measured EMF by a mullite probe corresponded to the oxygen activity determined bt the Al/Al_2O_3 (in mullite) equilibrium at liquid iron/electrolyte interface, while that of a ZrO_2-plug type probe corresponded to the supersaturated oxygen activity.5.The activity of silicon in Fe-Si alloys equilibrated with SiO_2 itwere determined by a mullite or ZrO_2-plug type probe. Both results agreed well with each other. The activity of silicon in carbon-saturated Fe-Si alloys obtained by a mullite probe agreed with those calculated from the analyzed silicon contents. The measured EMF by a mullite probe corresponded to the oxygen activity determined bt the Si/SioO_2 (in mullite) equilibrium at liquid iron/electrolyte interface.6.Since the measured EMF by a mullite probe corresponded to the aluminum or silicon activity not to the oxygen activity in bulk, it could be concluded that a mullite solid electrolytecould be used for Al-or Si-sensor in liquid metal.

1.用莫来石片(3Al_2O_3·2SiO_2)测定了氧化物(FeO、CoO、NiO)的生成自由能，证实了莫来石可用作固体电解质。/atm)=27.16-75500/T/3。用莫来石或氧化锆塞式探头测得的氧活度与由Al/Al_2O_3平衡计算的氧活度和由分析的氧含量估算的氧活度都是令人满意的。用氧化锆管式探头测得的氧活度比由分析得到的氧含量估算的值要高。从过饱和实验可以看出，莫来石探针测得的电动势对应于Al/Al_2O_3(莫来石中)在铁液/电解液界面的氧活度，而ZrO_2塞式探头测得的电动势对应于过饱和的氧活度。5.用莫来石或ZrO_2塞式探头测定与SiO_2平衡的Fe-Si合金中硅的活度。这两个结果彼此吻合得很好。用莫来石探头测得的碳饱和Fe-Si合金中硅的活度与由分析的硅含量计算的结果一致。6.由于莫来石探头测得的电动势对应于铝或硅的活度，而不是体相中的氧活度，因此莫来石固体电解技术可用作液态金属中的铝或硅传感器。