Effects of both crystallisation and Iron Oxides on the radiative heat transfer in mould fluxes

Masahiro Susa, Atsushi Kushimoto, Hiroaki Toyota, Miyuki Hayashi, Rie Endo, Yoshinao Kobayashi

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)

Abstract

To suggest a guideline for designing a mould flux for mild cooling, the radiative heat transfer characteristic of mould fluxes has been investigated using apparent reflectivity and transmissivity data on the basis of an optical-process model. The apparent reflectivities and transmissivities of mould fluxes were measured systematically as functions of the degree of crystallinity and the concentration of iron oxides, where the degree of crystallinity ranged between 0% and about 60%, and the concentration of iron oxides ranged between 0% and 2.0% on a mass basis. The apparent reflectivities and transmissivities were measured over the wavelength range 300-2 600 nm using a spectrophotometer with an integrating sphere. It has been found that crystallisation for mould fluxes increases the apparent reflectivity and decreases the apparent transmissivity, and that additions of iron oxides increase the apparent absorptivity of crystallised mould fluxes and instead decrease the apparent reflectivity. The radiative heat transfer characteristic has been evaluated using apparent reflectivity and transmissivity data on the basis of an optical-process model, which has suggested that crystallisation of mould fluxes leads to mild cooling due to increased apparent reflectivities and decreased apparent transmissivities. Furthermore, it has also been suggested that crystallised mould fluxes with no iron oxides can reduce radiative heat transfer even more by decreasing the apparent absorptivity and increasing the apparent reflectivity.

Original languageEnglish
Pages (from-to)1722-1729
Number of pages8
JournalISIJ International
Volume49
Issue number11
DOIs
Publication statusPublished - 2009
Externally publishedYes

Keywords

  • Apparent reflectivity and transmissivity.
  • Mild cooling
  • Mould flux for continuous casting
  • Radiative heat transfer
  • Spectrophotometer with integrating sphere

ASJC Scopus subject areas

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

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