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Title: Thermodynamic description of reactions between Mg and CaO
Authors: Schmid-Fetzer, R
Kozlov, A
Wiese, B
Mendis, CL
Tolnai, D
Kainer, KU
Hort, N
Keywords: Magnesium alloys;CaO;Thermodynamics evaluation;in situ XRD
Issue Date: 2016
Publisher: TMS
Citation: Magnesium Technology, pp. 67 - 72, (2016)
Abstract: CaO is considered as possible replacement for cover gases such as SF6 during melting and casting of Mg alloys. Such CaO additions to molten Mg increase the ignition resistance by forming a protective oxide layer. The actual reactions between liquid Mg and CaO are not well understood. An approach based on chemical reaction equations cannot capture the "CaO dissolution" process. This work presents the development of a consistent thermodynamic description of the ternary Mg-Ca-O alloy system. To that end a revision of the thermodynamic data of key oxides, CaO and MgO, has been performed based on original experimental work so far not considered in thermodynamic databases or tabulations. The formation of a liquid Mg-Ca-[O] alloy during the reaction is predicted from the thermodynamic calculations at melting temperatures; solidification simulations are also performed. These predictions from thermodynamic simulations are validated by experimental data using in situ synchrotron radiation diffraction.
ISBN: 9781119225805
ISSN: 1545-4150
Appears in Collections:Dept of Mechanical Aerospace and Civil Engineering Research Papers

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