Ellipsometric determination of normal spectral emissivities at 632.8 nm for solid NI-CO alloys at high temperature

Masahiro Susa, Kyohei Ohara, Rie Endo

Research output: Contribution to journalArticlepeer-review

Abstract

Normal spectral emissivities at 632.8 nm for solid Ni-Co alloys at high temperature are examined using ellipsometry. Nominal chemical compositions of Ni-Co alloy samples were prepared from grains of Ni and Co with 99.9mass% purity. Weighed mixtures of Ni and Co grains were placed in alumina crucibles in an induction furnace and then were melted at temperatures above 1800 K in dehydrated Ar atmosphere for more than 20 min. It was found that the emissivity values for Ni-Co alloys range between 0.3 and 0.4, irrespective of the alloy composition and temperature. It was observed that the emissivity values for Ni-Co alloys decrease with increasing temperature up to the respective Curie points and then increase. The results show that inner shell electrons seem to affect the emissivities of ferromagnetic phases more strongly.

Original languageEnglish
Pages (from-to)928-930
Number of pages3
JournalISIJ International
Volume49
Issue number6
DOIs
Publication statusPublished - 2009
Externally publishedYes

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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