Improvement of Thermal Stability of ZrO2-SiO2 Aerogel Modified by Ca(II) Cations

Hang Yuan Zhao; Xiao Lei Li; Jian He; Zhi Peng Hu; Hui Jun Yu

doi:10.4028/www.scientific.net/SSP.281.105

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HomeSolid State PhenomenaSolid State Phenomena Vol. 281Improvement of Thermal Stability of ZrO2-SiO2...

Improvement of Thermal Stability of ZrO₂-SiO₂ Aerogel Modified by Ca(II) Cations

Abstract:

Ca (II) modified ZrO₂-SiO₂ aerogel (CaZSA) with excellent thermal stability at 1000 °C was prepared by aging the ZrO₂-SiO₂ wet gel in calcium nitrate (Ca (NO₃)₂) ethanol solution followed with alcohol supercritical fluid drying method. The reaction between surface hydroxyl groups on the aerogel and Ca (II) ions played an important role in reducing the high temperature activity and inhibiting the particle growth caused by the condensation of hydroxyl groups of aerogel. Moreover, tiny secondary-phase particles, Ca (II) ions, introduced along grain boundaries serve as the pinning particles to inhibit the crystallization of ZrO₂-SiO₂ aerogel (ZSA). Thus the high-temperature stability of ZSA was significantly improved by surface modification with Ca (II). The specific surface area of CaZSA still maintained 223 m²·g^-1 after 1000 °C calcination, which was 52.7% higher than that of ZSA at the same treatment condition.

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Periodical:

Solid State Phenomena (Volume 281)

Pages:

105-110

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.281.105

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Online since:

August 2018

Authors:

Hang Yuan Zhao, Xiao Lei Li*, Jian He, Zhi Peng Hu, Hui Jun Yu

Keywords:

Ca(II) Ion, High-Temperature Stability, Microstructure, Modification, ZrO₂-SiO₂ Aerogel

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