Impact of pore structure on the thermal conductivity of glass foams

Martin Bonderup Østergaard; Biao Cai; Rasmus Rosenlund 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 Bonderup Østergaard, Biao Cai, Rasmus Rosenlund Petersen, Jakob König, Peter D Lee, Yuanzheng Yue

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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 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 language	English
Journal	Materials Letters
Volume	250
Pages (from-to)	72-74
Number of pages	3
ISSN	0167-577X
DOIs	https://doi.org/10.1016/j.matlet.2019.04.106
Publication status	Published - 1 Sept 2019

Keywords

Amorphous materials
Porous materials
Thermal properties
X-ray techniques

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10.1016/j.matlet.2019.04.106

Impact-of-pore-structure-on-the-thermal-conductivity-of-_2019_Materials-LettAccepted author manuscript, 559 KBLicence: CC BY-NC-ND 4.0

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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, 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. ",

keywords = "Amorphous materials, Porous materials, Thermal properties, X-ray techniques",

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AU - Østergaard, Martin Bonderup

AU - Cai, Biao

AU - Petersen, Rasmus Rosenlund

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, 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.

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, 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.

KW - Amorphous materials

KW - Porous materials

KW - Thermal properties

KW - X-ray techniques

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DO - 10.1016/j.matlet.2019.04.106

M3 - Letter

SN - 0167-577X

VL - 250

SP - 72

EP - 74

JO - Materials Letters

JF - Materials Letters

ER -

Impact of pore structure on the thermal conductivity of glass foams

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Keywords

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