ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Effects of Both Crystallisation and Iron Oxides on the Radiative Heat Transfer in Mould Fluxes
Masahiro SusaAtsushi KushimotoHiroaki ToyotaMiyuki HayashiRie EndoYoshinao Kobayashi
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2009 Volume 49 Issue 11 Pages 1722-1729

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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 300–2600 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.

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© 2009 by The Iron and Steel Institute of Japan
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