Phase Equilibria in the System "MnO"-CaO-MgO-SiO_2-Al_2O_3 with Al_2O_3/SiO_2 Weight Ratio of 0.17 and MgO/CaO Weight Ratio of 0.25 at Mn-Si Alloy Saturation

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著者

    • ZHAO Baojun
    • Pyrometallurgy Research Centre, School of Engineering, The University of Queensland
    • JAK Eugene
    • Pyrometallurgy Research Centre, School of Engineering, The University of Queensland
    • HAYES Peter C.
    • Pyrometallurgy Research Centre, School of Engineering, The University of Queensland

抄録

Liquidus isotherms and phase equilibria have been determined experimentally for a pseudo-ternary section of the form "MnO"–(CaO+MgO)–(SiO<sub>2</sub>+Al<sub>2</sub>O<sub>3</sub>) with a fixed Al<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub> weight ratio of 0.17 and MgO/CaO weight ratio of 0.25 for temperatures in the range 1 393–1 673 K.<br>The primary phase fields found in the investigated section include manganosite (Mn, Mg, Ca)O; dicalcium silicate α-2(Ca, Mg, Mn)O·SiO<sub>2</sub>; merwinite 3CaO·(Mg, Mn)O·2SiO<sub>2</sub>; melilite [2CaO·(MgO, MnO, Al<sub>2</sub>O<sub>3</sub>)·2(SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>)]; wollastonite [(Ca, Mg, Mn)O·SiO<sub>2</sub>]; diopside [(CaO, MgO, MnO, Al<sub>2</sub>O<sub>3</sub>)·SiO<sub>2</sub>]; tridymite (SiO<sub>2</sub>); rhodonite [(Mn, Mg, Ca)O·SiO<sub>2</sub>]; anorthite (CaO·Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub>) and tephroite [2(Mn, Mg, Ca)O·SiO<sub>2</sub>].<br>The liquidus temperatures and primary phase fields are significantly different to those in the ternary system "MnO"–CaO–SiO<sub>2</sub>, but are close to those previously reported pseudo-ternary section "MnO"–(CaO+MgO)–(SiO<sub>2</sub>+Al<sub>2</sub>O<sub>3</sub>) for Al<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub> weight ratio of 0.17 and MgO/CaO weight ratio of 0.17.<br>The partitioning of CaO, MgO and MnO between liquid and solid phases was measured using EPMA, and the extents of solid solutions for a range of bulk compositions and temperatures were characterised.

収録刊行物

  • ISIJ international

    ISIJ international 46(11), 1594-1602, 2006-11-15

    The Iron and Steel Institute of Japan

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