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.

Diffusion Phenomenon of Cathode Components in YSZ Electrolyte and Effect on Mechanical Properties of SOFC

“…1 mm thick YSZ plates with 15 mm in diameter was prepared by powder die pressing, and sintered at 1500 °C for 3 hours for densification. [18]. And a preparation method of fiber toughening YSZ composite powder was also used in the paper [19].…”