Preparation and Resistivity of Zirconia Oxygen Sensor Probe

Abstract:

A ZrO₂/Al₂O₃ (molar ratio of 1: 1, ZA) composite ceramic was formed by slip casting as solid electrolyte in a zirconia oxygen sensor. The bonding of the ZA ceramic green body to 95% Al₂O₃ ceramic green body support tube was carried out at 900 oC for 60 min by the gradient joining technique using pure Al₂O₃ slurry as the interlayer. Subsequently, the Pt slurry was coated on the surface of the pre-sintered composite ceramic, and then co-sintered at 1550 oC for 60 min to fabricate a Pt/ceramic composite probe. The interface microstructure and bonding mechanism were briefly investigated, and the electrical conductivity of the probe was tested. The experimental results show that the two high-quality ZA/Al₂O₃ and ZA/Pt interfaces were obtained. In particular, the relationship between the logarithm of conductivity (lnρ) and the reciprocal of temperature was well in accord with the Arrhenius equation. The Pt/ceramic composite probe presented the typical characteristic of high-temperature ionic conduction.

• Periodical: Key Engineering Materials (Volume 697)
• Pages: 267-270
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.697.267
• Online since: July 2016
• Authors: Bo Zhang, Xiang Zhao Zhang, Hui Wang, Gui Wu Liu*, Hai Cheng Shao, Guan Jun Qiao
• Keywords: Gradient Joining, Oxygen Sensor, Resistivity, ZrO₂/Al₂O₃ Composite Ceramic

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