Improvement in the high temperature thermal insulation performance of Y2O3 opacified silica aerogels

Vinayak G. Parale, Hae Noo Ree Jung, Wooje Han, Kyu Yeon Lee, Dinesh B. Mahadik, Hyung Hee Cho, Hyung Ho Park

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21 Citations (Scopus)

Abstract

To improve the high-temperature thermal insulation characteristics of silica aerogels, it is important to reduce the radiative heat transfer. This can be achieved by Y2O3 doping in the silica sol to opacify the infrared radiation of silica aerogels. The purpose of the present work was to study the effect of Y2O3 incorporation on the structural and physicochemical properties of opacified silica aerogels prepared by a simple ambient pressure drying method. The influence of Y2O3 addition on specific extinction coefficient and high temperature thermal insulation of prepared aerogels were investigated. The synthesized aerogels were lightweight and crack-free, with a granular, nanoporous morphology. The specific surface area, pore diameter, and bulk density of the prepared samples were 917.5–937.6 m2/g, 5.64–6.58 nm, and 0.047–0.076 g/cm3, respectively. The thermal conductivity of opacified silica aerogel at 1000 K was 0.080 W/(m.K), which was lower than the unopacified silica aerogel and it was around 0.104 W/(m.K) at same temperature.

Original languageEnglish
Pages (from-to)871-878
Number of pages8
JournalJournal of Alloys and Compounds
Volume727
DOIs
Publication statusPublished - 2017 Dec 15

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All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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