Impact of pore structure on the thermal conductivity of glass foams

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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, Mn 3O 4 and carbon as foaming agents, and K 3PO 4 as additive, to a suitable temperature above T g, 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 to 49 mW m −1 K −1 with increasing the pore size 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.

Original languageEnglish
JournalMaterials Letters
Pages (from-to)72-74
Number of pages3
Publication statusPublished - 1 Sept 2019


  • Amorphous materials
  • Porous materials
  • Thermal properties
  • X-ray techniques


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