Impact of pore structure on the thermal conductivity of glass foams

Martin B. Østergaard; Biao Cai; Rasmus R. Petersen; Jakob König; Peter D. Lee; Yuanzheng Yue

doi:10.1016/j.matlet.2019.04.106

Impact of pore structure on the thermal conductivity of glass foams

Martin B. Østergaard, Biao Cai, Rasmus R. Petersen, Jakob König, Peter D. Lee, Yuanzheng Yue

Metallurgy and Materials

Research output: Contribution to journal › Letter › peer-review

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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, Mn₃O₄ and carbon as foaming agents, and K₃PO₄ 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 57–49 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.

Original language	English
Pages (from-to)	72-74
Number of pages	3
Journal	Materials Letters
Volume	250
Early online date	26 Apr 2019
DOIs	https://doi.org/10.1016/j.matlet.2019.04.106
Publication status	Published - 1 Sept 2019

Keywords

Amorphous materials
Porous materials
Thermal propertiesX-ray techniques

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Martin_B_Østergaard_et_al_Impact_of_pore_structure_on_the_thermal_conductivity_of_glass_foams_Materials_Letters_2019
Checked for eligibility: 08/05/2019
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Cite this

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title = "Impact of pore structure on the thermal conductivity of glass foams",

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.",

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AU - Østergaard, Martin B.

AU - Cai, Biao

AU - Petersen, Rasmus R.

AU - König, Jakob

AU - Lee, Peter D.

AU - Yue, Yuanzheng

PY - 2019/9/1

Y1 - 2019/9/1

N2 - 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.

AB - 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.

KW - Amorphous materials

KW - Porous materials

KW - Thermal propertiesX-ray techniques

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VL - 250

SP - 72

EP - 74

JO - Materials Letters

JF - Materials Letters

ER -

Impact of pore structure on the thermal conductivity of glass foams

Abstract

Keywords

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