Noncontact Measurements of Thermophysical Properties of Molybdenum at High Temperatures |
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Authors: | P-F Paradis T Ishikawa S Yoda |
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Affiliation: | (1) National Space Development Agency of Japan, Tsukuba Space Center, 2-1-1 Sengen, cTsukuba City, Ibaraki, 305-8505, Japan |
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Abstract: | Four thermophysical properties of both solid and liquid molybdenum, namely, the density, the thermal expansion coefficient, the constant-pressure heat capacity, and the hemispherical total emissivity, are reported. These thermophysical properties were measured over a wide temperature range, including the undercooled state, using an electrostatic levitation furnace developed by the National Space Development Agency of Japan. Over the 2500 to 3000 K temperature span, the density of the liquid can be expressed as
L(T)=9.10×103–0.60(T–T
m) (kg·m–3), with T
m=2896 K, yielding a volume expansion coefficient
L(T)=6.6×10–5 (K–1). Similarly, over the 2170 to 2890 K temperature range, the density of the solid can be expressed as
S(T)=9.49×103–0.50(T–T
m), giving a volume expansion coefficient
S(T)=5.3×10–5. The constant pressure heat capacity of the liquid phase could be estimated as C
PL(T)=34.2+1.13×10–3(T–T
m) (J·mol–1·K–1) if the hemispherical total emissivity of the liquid phase remained constant at 0.21 over the temperature interval. Over the 2050 to 2890 K temperature span, the hemispherical total emissivity of the solid phase could be expressed as
TS(T)=0.29+9.86×10–5(T–T
m). The latent heat of fusion has also been measured as 33.6 kJ·mol–1. |
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Keywords: | density hemispherical total emissivity latent heat of fusion liquid metal molten molybdenum noncontact processing |
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