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Thermal conductivity of powders used in continuous casting of steel part 1: Glassy and crystalline slags
RISE, Swerea, Swerea KIMAB.
RISE, Swerea, Swerea KIMAB.
2015 (English)In: Ironmaking & steelmaking, ISSN 0301-9233, E-ISSN 1743-2812, Vol. 42, no 6, 456-464 p.Article in journal (Refereed)
Abstract [en]

Measurements of the thermal conductivity (λ) and thermal diffusivity (α) have been carried out on samples of Na2O·SiO2 and four mould slags for temperatures between 295 and 1300 K. These measurements were carried out using the transient plane source (TPS) method (295-373 K) and the transient hot wire (THW) technique (295-1300 K) and the laser pulse (LP) or laser flash method in the case of Na2O·SiO2 Values of l295 were very similar (1.07±0.03 W m-1 K-1) and all samples exhibited a maximum at the critical temperature (Tcrit 51040±10 K) beyond which there was a sharp drop in λTHW with increasing temperature. Measurements were also carried out on semi-crystalline samples with increasing λ and fraction of crystalline phase. These samples also exhibited a sharp drop in the thermal conductivity for temperatures above Tcrit and λTcrit was found to be 1.6±0.05 W m-1 K-1. Thermal conductivity (λLP) values calculated from reported thermal diffusivity (αLP) values were in very good agreement with the measured λTHW values for temperatures between 295 K and Tcrit but λLP values did not decrease with increasing temperature above Tcrit (cf. λTHW). Consequently, it was found that λLP≈7λTHW for mould slags. © 2015 Institute of Materials, Minerals and Mining.

Place, publisher, year, edition, pages
2015. Vol. 42, no 6, 456-464 p.
Keyword [en]
Casting powder, Continuous casting, Continuous casting slag, Heat capacity, Laser flash, Laser pulse, Sodium metasilicate, Thermal conductivity, Thermal diffusivity, Transient hot wire method, Transient plane source
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-12773DOI: 10.1179/1743281214Y.0000000250Scopus ID: 2-s2.0-84940103116OAI: oai:DiVA.org:ri-12773DiVA: diva2:972966
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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