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Discontinuity in normal spectral emissivity of solid and liquid copper at the melting point

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Abstract

Normal spectral emissivities for solid (ɛλ,solid) and liquid (ɛλ,liquid) copper at the melting point have been determined, and the discontinuity in ɛλ,liquid and ɛλ,solid at the melting point has been discussed. The spectral emissivity was determined by comparing the spectral radiation intensity of the sample to that of the fixed-point blackbody over the wavelength range 550 to 750 nm. The samples and fixed-point blackbody were heated in the continuous casting type cold crucible. Values of ɛλ,liquid and ɛλ,solid at 650 nm were 0.167 and 0.108, respectively. The emissivity ratio of ɛλ,liquid/ɛλ,solid increased from approximately 1.2 to 1.8 as the wavelength increased in the range 550 to 750 nm. The discontinuity in ɛλ,liquid and ɛλ,solid at the melting point has been qualitatively explained by the optical absorption mechanism due to the intraband transition.

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Authors and Affiliations

  1. the Department of Metallurgical Engineering, Tokyo Institute of Technology, 152, Tokyo, Japan

    H. Watanabe (Graduate Student), M. Susa (Associate Professor) & K. Nagata (Professor)

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  1. H. Watanabe
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  2. M. Susa
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  3. K. Nagata
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Watanabe, H., Susa, M. & Nagata, K. Discontinuity in normal spectral emissivity of solid and liquid copper at the melting point. Metall Mater Trans A 28, 2507–2513 (1997). https://doi.org/10.1007/s11661-997-0008-7

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  • DOI: https://doi.org/10.1007/s11661-997-0008-7

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