Solubility of O and Ca in molten Ti-Cu alloys equilibrated with a CaO-MgO-CaCl2 flux at 1473 K

Ichiro Seki, Kazuhiro Nagata, Jun Tanabe, Tetsuya Ashino

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    1 Citation (Scopus)

    Abstract

    Solubility of Ca and O in molten Ti-Cu alloys equilibrated with a CaO-MgO-CaCl2 ternary flux in CaO or MgO crucibles at 1473 K was analytically investigated. The Equilibrium constant of deoxidization reaction by dissolved Ca can be determined as follows: CaO(s)in CaO crucible = Cain Metal + Oin Metal, - 3.25 = logK, K= (aca · aO) / (aCaO) Moreover, from the investigated partial pressure of O around the reaction cell, an equilibrium constant of dissoluble reaction of O in the molten alloys can be determined as follows: 1/2O2 = Oin Metal, 16.08 = logK, K= [aO in Metal]/(PO21/2) If it is possible to use an equilibrium constant of calcia formation published as a thermodynamic data book, an equilibrium constant of dissolution reaction of calcium into molten alloys can be determined as follows, Cain Flux = Cain Metal, -2.29 = logK, K= [aCa in Metal] / (aCa in Flux) The activity of CaO in the CaO-MgO-CaCl2 ternary flux equilibrated with a MgO crucible is determined as 0.76 compared to the normal state (aCaO = 1) using a CaO crucible. This is obtained from the difference of the equilibrium constants of CaO formation using CaO and MgO crucibles, as expressed by the relation: logK = logK′ + logaCaO.

    Original languageEnglish
    Pages (from-to)475-484
    Number of pages10
    JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
    Volume79
    Issue number10
    DOIs
    Publication statusPublished - 2015 Oct

    Keywords

    • Distribution
    • Equilibrium constant
    • Fluxing
    • Metallic glass
    • Reduction
    • Smelting

    ASJC Scopus subject areas

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

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