Østergaard, MB;
Cai, B;
Petersen, RR;
König, J;
Lee, PD;
Yue, Y;
(2019)
Impact of pore structure on the thermal conductivity of glass foams.
Materials Letters
, 250
pp. 72-74.
10.1016/j.matlet.2019.04.106.
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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, Mn 3 O 4 and carbon as foaming agents, and K 3 PO 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.
| Type: | Article |
|---|---|
| Title: | Impact of pore structure on the thermal conductivity of glass foams |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.matlet.2019.04.106 |
| Publisher version: | https://doi.org/10.1016/j.matlet.2019.04.106 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Amorphous materials, Porous materials, Thermal properties, X-ray techniques |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10075362 |
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