Thermal conductivity of CaO-SiO2-Al2O3 glassy slags: Its dependence on molar ratios of Al2O3/CaO and SiO2/Al2O3

M. Susa, M. Watanabe, S. Ozawa, R. Endo

研究成果: Article査読

26 被引用数 (Scopus)

抄録

Thermal conductivities of CaO-SiO2-Al2O3 glassy slags have been determined using the non-stationary hot wire method as functions of (mol.-%Al2O3)/(mol.-%CaO) and (mol.-%SiO 2)/ (mol-%Al2O3) ratios over a temperature range 300-1270 K. The thermal conductivities of the samples investigated were in the range between 1.0 and 1.6 Wm-1 K-1. The thermal conductivities of samples having a constant concentration of SiO2 increased with increasing the (mol.-%Al2O3)/ (mol.-%CaO) ratio as long as the constant pressure heat capacity per unit volume was kept constant. This increase in thermal conductivities would be due to increases in the speed of sound and/or the phonon mean free path by re-polymerisation of the network structure of silicate glasses by Al2O3. On the other hand, the thermal conductivities of samples having a constant value of NBO/T (the ratio of the number of non-bridging oxygen ions per tetrahedrally coordinated cation) decreased with increasing the (mol.-%SiO2)/(mol.- %Al2O3) ratio. This decrease in thermal conductivities would be dominated by the constant pressure heat capacities per unit volume of the samples.

本文言語English
ページ(範囲)124-130
ページ数7
ジャーナルIronmaking and Steelmaking
34
2
DOI
出版ステータスPublished - 2007 3月
外部発表はい

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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