Relationship between thermal conductivities and viscosities of CaOSiO2- Al2O3-R2O (R=Na, K, Li) melts

Tsukasa Inose, Junpei Ojima, Takateru Maesono, Sohei Sukenaga, Hiroyuki Shibata, Hiromichi Ohta

    Research output: Contribution to conferencePaperpeer-review

    Abstract

    The thermal conductivities of silicate melts play an important role in the solidification and refining of metals; these conductivities depend on the SiO4 network structure, and are reduced by the addition of Na2O or K2O. In addition, the viscosity of the silicate system is related to the network structure of SiO2 and Al2O3, and changes with the addition of R2O (R=Na, K, Li). In this study, the thermal conductivities of CaO-SiO2-Al2O3-R2O molten slags were measured using a front-heating front-detection laser flash method, which performed the measurements within 4-12ms after laser irradiation and without the effects of thermal radiation and convection. The correlation between the viscosity measured by Sukenaga et al. and the thermal conductivity obtained in the present study was discussed. Although the thermal conductivity exhibited almost no dependence on temperature, the viscosity decreased rapidly with increasing temperature. Furthermore, depending on the structure of the melts, the addition of R2O had both positive and negative effects on viscosity. However, the thermal conductivity was, reduced by the addition of R2O.

    Original languageEnglish
    Pages843-845
    Number of pages3
    Publication statusPublished - 2015 Jan 1
    Event6th International Congress on the Science and Technology of Steelmaking, ICS 2015 - Beijing, China
    Duration: 2015 May 122015 May 14

    Other

    Other6th International Congress on the Science and Technology of Steelmaking, ICS 2015
    CountryChina
    CityBeijing
    Period15/5/1215/5/14

    Keywords

    • Alkali oxide
    • Network structure
    • Thermal conductivity
    • Viscosity

    ASJC Scopus subject areas

    • Metals and Alloys

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