Normal Spectral Emissivity Measurement of Molten Cu–Co Alloy Using an Electromagnetic Levitator Superimposed with a Static Magnetic Field

Shoya Ueno, Yuki Nakamura, Kenichi Sugioka, Masaki Kubo, Takao Tsukada, Masahito Uchikoshi, Hiroyuki Fukuyama

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The normal spectral emissivity of molten Cu–Co alloy with different compositions was measured in the wavelength range of 780 nm to 920 nm and in the temperature range of 1430 K to 1770 K including the undercooled condition by an electromagnetic levitator superimposed with a static magnetic field. The emissivity was determined as the ratio of the radiance from a levitated molten Cu–Co droplet measured by a spectrometer to the radiance from a blackbody calculated by Planck’s law at a given temperature, where a static magnetic field of 2.5 T to 4.5 T was applied to the levitated droplet to suppress the surface oscillation and translational motion of the sample. We found little temperature dependence of the normal spectral emissivity of molten Cu–Co alloy. Concerning the composition dependence, the emissivity decreased markedly above 80 at%Cu and reached that of pure Cu, although its dependence was low between 20 at%Cu and 80 at%Cu. In addition, this composition dependence of the emissivity of molten Cu–Co alloy can be explained well by the Drude free-electron model.

Original languageEnglish
Article number16
JournalInternational Journal of Thermophysics
Volume38
Issue number2
DOIs
Publication statusPublished - 2017 Feb 1

Keywords

  • Composition dependence
  • Drude model
  • Electromagnetic levitation
  • Molten Cu–Co alloy
  • Normal spectral emissivity
  • Static magnetic field

ASJC Scopus subject areas

  • Condensed Matter Physics

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