Improved Fracture Strength of 5YSZ/Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; Composite Matrix by Addition of SiO&lt;sub&gt;2&lt;/sub&gt; for Planar Automotive Oxygen Sensor

Wu, Lei; Ma, Ben; Pu, Jian; Chi, Bo; Li, Jian

doi:10.4028/www.scientific.net/kem.768.97

KEM

2018

DOI: 10.4028/www.scientific.net/kem.768.97

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Improved Fracture Strength of 5YSZ/Al2O3 Composite Matrix by Addition of SiO2 for Planar Automotive Oxygen Sensor

Lei Wu

Ben Ma

Jian Pu

et al.

Abstract: As the ceramic substrate materials in automobile oxygen sensor, 5YSZ/Al2O3matrix composite ceramic with different amount of silica are prepared by ball-milling,tape casting and sintering.They are investigated for their microstructure and mechanical properties.The microstructure of the sample is analyzed by Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Spectroscopy (EDX).Fracture strength is measured by ring-on-ring method. It is found that adding 1 wt.% SiO2into 5YSZ/Al2O3matrix can improve th… Show more

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Cited by 2 publications

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Sintering characteristics and electrical properties of 5YSZ electrolyte

Wan

Zhang

et al. 2023

AIP Advances

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5YSZ (5 mol. %Y2O3 stabilized ZrO2) solid electrolytes play a key role in NOx sensors for their important ion conduction performance in the sensing process. In this study, the influence of sintering and test temperature on 5YSZ solid electrolytes was investigated. The 5YSZ solid electrolyte was prepared by the tape casting process, followed by the sintering process. The ionic conductivity of the 5YSZ solid electrolyte sintered at 1450 °C is higher than that of other samples. The conductivity and activation energy of grain interior and grain boundary showed opposite tendency. The performance of ion conductivity was attributed to (1) the higher test temperature being applied to the working electrolyte and accelerated transfer efficiency and (2) enhanced diffusion of oxygen ions, which increased through the formation of dense structure.

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Sintering characteristics and electrical properties of 5YSZ electrolyte

Wan

Zhang

et al. 2023

AIP Advances

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Controllable sintering behaviors of Al2O3 green tapes and co-firing compatibility of Al2O3/YSZ ceramics

Li,

Chen,

Zhang

et al. 2024

AIP Advances

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As a typical insulating material, Al2O3 serves as the signal isolation device in multi-layer ceramic NOx sensors. However, the application of Al2O3-based insulating materials is limited by the co-firing compatibility between Al2O3 and yttria-stabilized zirconia (YSZ). In the present study, Al2O3 green tapes with different contents of γ-Al2O3 and SiO2–B2O3 (Si–B) are developed to promote the integration of Al2O3-based insulating material and YSZ. The sintering shrinkage of the obtained Al2O3 green tapes is greatly influenced by the ratio of γ-Al2O3 to α-Al2O3 at 1450 °C, e.g., the maximum shrinkage reaches 17.34% when the γ-Al2O3 to α-Al2O3 ratio is 1:2. The addition of Si–B greatly increases the low density of Al2O3 tapes due to the pores generated during the firing process of the ultrafine γ-Al2O3 powders. The sintering density increases to 97.1% when the Si–B content is 15 wt. %, and the sintering shrinkage reaches a relatively higher value of 17.25%. The obtained Al2O3-based insulating materials show a greatly co-firing matching performance with the YSZ green tapes. This work will contribute to further investigation of ceramic co-firing studies.

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Improved Fracture Strength of 5YSZ/Al<sub>2</sub>O<sub>3</sub> Composite Matrix by Addition of SiO<sub>2</sub> for Planar Automotive Oxygen Sensor

Cited by 2 publications

References 12 publications

Sintering characteristics and electrical properties of 5YSZ electrolyte

Sintering characteristics and electrical properties of 5YSZ electrolyte

Controllable sintering behaviors of Al2O3 green tapes and co-firing compatibility of Al2O3/YSZ ceramics

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