Impact of pore structure on the thermal conductivity of glass foams

Research output: Contribution to journalLetter

Authors

  • Martin B. Østergaard
  • Rasmus R. Petersen
  • Jakob König
  • Peter D. Lee
  • Yuanzheng Yue

Colleges, School and Institutes

Abstract

The thermal conductivity (λ) of glass foams is thought to depend on pore size. We report on the impact of pore size, determined using X-ray microtomography, and percentage porosity on the λ of glass foams. Glass foams were prepared by heating powder mixtures of obsolete cathode ray tube (CRT) panel glass, Mn3O4 and carbon as foaming agents, and K3PO4 as additive, to a suitable temperature above Tg, and subsequent cooling. Here, we report for the first time a correlation between λ and pore size in the range 0.10–0.16 mm showing a decrease from 57–49 mW m-1 K-1 with increasing the pore for glass foams with porosities of 87–90 %. This indicates that the pore structure should be optimized in order to improve the insulating performance of glass foams.

Details

Original languageEnglish
Pages (from-to)72-74
Number of pages3
JournalMaterials Letters
Volume250
Early online date26 Apr 2019
Publication statusPublished - 1 Sep 2019

Keywords

  • Amorphous materials, Porous materials, Thermal propertiesX-ray techniques