Thermodynamic description of reactions between Mg and CaO

Publikation: Beiträge in SammelwerkenAufsätze in KonferenzbändenForschungbegutachtet

Authors

  • Rainer Schmid-Fetzer
  • Artem Kozlov
  • Björn Wiese
  • Chamini L. Mendis
  • Domonkos Tolnai
  • Karl U. Kainer
  • Norbert Hort

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.

OriginalspracheEnglisch
TitelMagnesium Technology 2016 - Held During TMS 2016 : 145th Annual Meeting and Exhibition
HerausgeberAlok Singh, Kiran Solanki, Michele Viola Manuel, Neale R. Neelameggham
Anzahl der Seiten6
VerlagThe Minerals, Metals & Materials Society
Erscheinungsdatum2016
Seiten67-72
ISBN (elektronisch)9781119225805
DOIs
PublikationsstatusErschienen - 2016
Extern publiziertJa
Veranstaltung145th Annual Meeting and Exhibition of Magnesium Technology - TMS 2016 - Nashville, USA / Vereinigte Staaten
Dauer: 14.02.201618.02.2016
Konferenznummer: 145

DOI

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