TY - JOUR
T1 - Thermal conductivity of oxide scale thermally grown on iron substrate corrected by temperature-dependent interfacial thermal resistance in laser flash measurement
AU - Li, Mu
AU - Endo, Rie
AU - Akoshima, Megumi
AU - Tanei, Hiroshi
AU - Okada, Hikaru
AU - Susa, Masahiro
N1 - Funding Information:
This work was supported by the research group for “Thermophysical Properties of Oxide Scale” in Rolling Theory Committee, The Iron and Steel Institute of Japan. The authors would like to express their appreciation to the members for the useful advice.
Publisher Copyright:
© 2019 ISIJ.
PY - 2019/3
Y1 - 2019/3
N2 - Thermal conductivities of iron oxide scales have been determined in a temperature range of room temperature to 1 176 K by the laser flash method, where the interfacial thermal resistance between FeO and iron has been corrected for each temperature. Two series of samples were prepared from iron plates with 99.99% purity. One was samples with FeO scale only and the other was samples with multi-layered scale of Fe2O3/Fe3O4/FeO. The laser flash method was applied to measure apparent thermal diffusivities, which were converted to apparent thermal conductivities. Apparent thermal conductivities obtained are contaminated by the interfacial thermal resistance between scale and iron, and are in linear proportion to scale thickness. Using apparent thermal conductivities at room temperature, thermal conductivities of scale have been derived from the slope of the linearity as 2.4 Wm−1K−1 for FeO scale and 1.8 Wm−1K−1 for multi-layered scale, and interfacial thermal resistances have been derived from the intercept as 7.3×10−6 m2KW−1 for the interface at FeO/iron and 6.4 × 10−6 m2KW−1 for the interface at multi-layered scale/iron. The interfacial thermal resistance between FeO and iron decreases with increasing temperature. Considering these temperature-dependent interfacial thermal resistances, thermal conductivity values of FeO scale have been determined as a function of temperature. The values are roughly 2.2 Wm−1K−1 up to 1 176 K except 6.9 Wm−1K−1 at 674 K where the decomposition of FeO tends to take place.
AB - Thermal conductivities of iron oxide scales have been determined in a temperature range of room temperature to 1 176 K by the laser flash method, where the interfacial thermal resistance between FeO and iron has been corrected for each temperature. Two series of samples were prepared from iron plates with 99.99% purity. One was samples with FeO scale only and the other was samples with multi-layered scale of Fe2O3/Fe3O4/FeO. The laser flash method was applied to measure apparent thermal diffusivities, which were converted to apparent thermal conductivities. Apparent thermal conductivities obtained are contaminated by the interfacial thermal resistance between scale and iron, and are in linear proportion to scale thickness. Using apparent thermal conductivities at room temperature, thermal conductivities of scale have been derived from the slope of the linearity as 2.4 Wm−1K−1 for FeO scale and 1.8 Wm−1K−1 for multi-layered scale, and interfacial thermal resistances have been derived from the intercept as 7.3×10−6 m2KW−1 for the interface at FeO/iron and 6.4 × 10−6 m2KW−1 for the interface at multi-layered scale/iron. The interfacial thermal resistance between FeO and iron decreases with increasing temperature. Considering these temperature-dependent interfacial thermal resistances, thermal conductivity values of FeO scale have been determined as a function of temperature. The values are roughly 2.2 Wm−1K−1 up to 1 176 K except 6.9 Wm−1K−1 at 674 K where the decomposition of FeO tends to take place.
KW - FeO
KW - Interfacial thermal resistance
KW - Laser flash method
KW - Multi-layered iron oxide scale
KW - Thermal conductivity
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U2 - 10.2355/isijinternational.ISIJINT-2018-553
DO - 10.2355/isijinternational.ISIJINT-2018-553
M3 - Article
AN - SCOPUS:85063955978
VL - 59
SP - 398
EP - 403
JO - Transactions of the Iron and Steel Institute of Japan
JF - Transactions of the Iron and Steel Institute of Japan
SN - 0915-1559
IS - 3
ER -