Thermal conductivity of molten silicate of Al2O3-CaO-Na2O-SiO2 measured by means of a front heating-front detection laser flash method

Hiroki Hasegawa, Takaya Kowatari, Yasuhiro Shiroki, Hiroyuki Shibata, Hiromichi Ohta, Yoshio Waseda

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    Abstract

    Thermal conductivity values have been systematically obtained for molten silicates containing Al2O3, CaO, Na2O, and SiO2 by means of a front heating-front detection laser flash method. The measurements were made for 13 samples in the temperature range between 1073 K and 1823 K (800 °C and 1550 °C), depending on the composition. Thermal conductivities of the silicate melts are found to be relatively insensitive to the variation of temperature, but they depend on the composition ratio, particularly the ratio of Non-Bridging Oxygen ions per Tetrahedrally coordinated cation—NBO/T. The thermal conductivity values decrease from 2.8 W/mK to 1.5 W/mK with the NBO/T value until it reaches about 1. Thermal conductivity values become constant for silicate melts with a higher value of NBO/T. It is known that the length of the silicate chain decreases with disconnection by the addition of alkaline earth cation or alkaline cation. The strong correlation between thermal conductivity and NBO/T is quite likely to suggest that silicate chain is a preferential path for heat transport in silicate melts.

    Original languageEnglish
    Pages (from-to)1413-1419
    Number of pages7
    JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
    Volume43
    Issue number6
    DOIs
    Publication statusPublished - 2012 Dec 1

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanics of Materials
    • Metals and Alloys
    • Materials Chemistry

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