Effect of glass transition: Density and thermal conductivity measurements of B2O3

Dmitry Chebykin; Hans Peter Heller; Ivan Saenko; Gert Bartzsch; Rie Endo; Olena Volkova

doi:10.32908/hthp.v49.801

Effect of glass transition: Density and thermal conductivity measurements of B₂O₃

Dmitry Chebykin, Hans Peter Heller, Ivan Saenko, Gert Bartzsch, Rie Endo, Olena Volkova

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

2 Citations (Scopus)

Abstract

The role of B2O3 as a fluxing agent for developing fluoride free fluxes has been accentuated in the recent years. Therefore, knowledge about thermophysical properties of the oxide are essential to find the optimal chemical composition of the mold fluxes. In the present study, the density and thermal conductivity of B2O3 were measured by means of the buoyancy method, the maximal bubble pressure (MBP) method and the hot-wire method in the temperature range of 295-1573 K. The results are discussed in the context of the chemical stability of the B2O3 as well as the effect of glass transition on the thermal conductivity. The density of the B2O3 decreases non-linearly with increasing temperature in the temperature range of 973-1573 K. The MBP method was successfully applied for the density measurements with a viscosity up to 91 Pa.s. The thermal conductivity of the B2O3 in the solid and molten states increases with increasing temperature. Based on the Kittel's equation, the temperature dependence of the thermal conductivity through the glass transition temperature of B2O3 was discussed.

Original language	English
Pages (from-to)	125-142
Number of pages	18
Journal	High Temperatures - High Pressures
Volume	49
Issue number	1-2
DOIs	https://doi.org/10.32908/hthp.v49.801
Publication status	Published - 2020
Externally published	Yes

Keywords

BO
Boron trioxide
Buoyancy method
Density
Glass transition
Hot-wire method
Maximum bubble pressure method
Thermal conductivity

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Physical and Theoretical Chemistry

Access to Document

10.32908/hthp.v49.801

Cite this

@article{7c55c51c70124914bd98bed7f1998b8e,

title = "Effect of glass transition: Density and thermal conductivity measurements of B2O3",

abstract = "The role of B2O3 as a fluxing agent for developing fluoride free fluxes has been accentuated in the recent years. Therefore, knowledge about thermophysical properties of the oxide are essential to find the optimal chemical composition of the mold fluxes. In the present study, the density and thermal conductivity of B2O3 were measured by means of the buoyancy method, the maximal bubble pressure (MBP) method and the hot-wire method in the temperature range of 295-1573 K. The results are discussed in the context of the chemical stability of the B2O3 as well as the effect of glass transition on the thermal conductivity. The density of the B2O3 decreases non-linearly with increasing temperature in the temperature range of 973-1573 K. The MBP method was successfully applied for the density measurements with a viscosity up to 91 Pa.s. The thermal conductivity of the B2O3 in the solid and molten states increases with increasing temperature. Based on the Kittel's equation, the temperature dependence of the thermal conductivity through the glass transition temperature of B2O3 was discussed.",

keywords = "BO, Boron trioxide, Buoyancy method, Density, Glass transition, Hot-wire method, Maximum bubble pressure method, Thermal conductivity",

author = "Dmitry Chebykin and Heller, {Hans Peter} and Ivan Saenko and Gert Bartzsch and Rie Endo and Olena Volkova",

note = "Funding Information: The contributions of M.A. Kaufmann for academic paper writing to the present work are gratefully acknowledged. Thanks are extended to the European Social Fund (ESF) for financial support of this research. Publisher Copyright: {\textcopyright} 2020 Old City Publishing, Inc.",

year = "2020",

doi = "10.32908/hthp.v49.801",

language = "English",

volume = "49",

pages = "125--142",

journal = "High Temperatures - High Pressures",

issn = "0018-1544",

publisher = "Old City Publishing",

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}

TY - JOUR

T1 - Effect of glass transition

T2 - Density and thermal conductivity measurements of B2O3

AU - Chebykin, Dmitry

AU - Heller, Hans Peter

AU - Saenko, Ivan

AU - Bartzsch, Gert

AU - Endo, Rie

AU - Volkova, Olena

N1 - Funding Information: The contributions of M.A. Kaufmann for academic paper writing to the present work are gratefully acknowledged. Thanks are extended to the European Social Fund (ESF) for financial support of this research. Publisher Copyright: © 2020 Old City Publishing, Inc.

PY - 2020

Y1 - 2020

N2 - The role of B2O3 as a fluxing agent for developing fluoride free fluxes has been accentuated in the recent years. Therefore, knowledge about thermophysical properties of the oxide are essential to find the optimal chemical composition of the mold fluxes. In the present study, the density and thermal conductivity of B2O3 were measured by means of the buoyancy method, the maximal bubble pressure (MBP) method and the hot-wire method in the temperature range of 295-1573 K. The results are discussed in the context of the chemical stability of the B2O3 as well as the effect of glass transition on the thermal conductivity. The density of the B2O3 decreases non-linearly with increasing temperature in the temperature range of 973-1573 K. The MBP method was successfully applied for the density measurements with a viscosity up to 91 Pa.s. The thermal conductivity of the B2O3 in the solid and molten states increases with increasing temperature. Based on the Kittel's equation, the temperature dependence of the thermal conductivity through the glass transition temperature of B2O3 was discussed.

AB - The role of B2O3 as a fluxing agent for developing fluoride free fluxes has been accentuated in the recent years. Therefore, knowledge about thermophysical properties of the oxide are essential to find the optimal chemical composition of the mold fluxes. In the present study, the density and thermal conductivity of B2O3 were measured by means of the buoyancy method, the maximal bubble pressure (MBP) method and the hot-wire method in the temperature range of 295-1573 K. The results are discussed in the context of the chemical stability of the B2O3 as well as the effect of glass transition on the thermal conductivity. The density of the B2O3 decreases non-linearly with increasing temperature in the temperature range of 973-1573 K. The MBP method was successfully applied for the density measurements with a viscosity up to 91 Pa.s. The thermal conductivity of the B2O3 in the solid and molten states increases with increasing temperature. Based on the Kittel's equation, the temperature dependence of the thermal conductivity through the glass transition temperature of B2O3 was discussed.

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KW - Maximum bubble pressure method

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