Please use this identifier to cite or link to this item:
http://bura.brunel.ac.uk/handle/2438/14508
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. |
URI: | http://bura.brunel.ac.uk/handle/2438/14508 |
ISBN: | 9781119225805 |
ISSN: | 1545-4150 |
Appears in Collections: | Brunel Centre for Advanced Solidification Technology (BCAST) |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Fulltext.pdf | 650.44 kB | Adobe PDF | View/Open |
Items in BURA are protected by copyright, with all rights reserved, unless otherwise indicated.