Acid Leaching of SHS Produced Magnesium Oxide/Titanium Diboride

The stoichiometric self‐propagating high‐temperature synthesis (SHS) thermite reaction involving magnesium (Mg), titanium dioxide (TiO2), and boron oxide (B2O3) forms MgO and titanium diboride (TiB2) as final products. Selective acid leaching is used to remove the MgO leaving TiB2 powder. This study...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2009-01, Vol.92 (1), p.26-31
Main Authors: Lok, Jonathan Y., Logan, Kathryn V., Payyapilly, Jairaj J.
Format: Article
Language:English
Subjects:
Acids
High temperature
Leaching
Magnesium
Magnesium composites
Mass spectrometry
Titanium
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Summary:The stoichiometric self‐propagating high‐temperature synthesis (SHS) thermite reaction involving magnesium (Mg), titanium dioxide (TiO2), and boron oxide (B2O3) forms MgO and titanium diboride (TiB2) as final products. Selective acid leaching is used to remove the MgO leaving TiB2 powder. This study investigates the acid leaching of SHS‐produced MgO/TiB2 powders and a stoichiometric mixture of commercially obtained MgO and TiB2 powders. Leaching was conducted at pH levels of 4.0, 2.5, and 1.0 by the introduction of concentrated aliquots of HNO3. This method maintains a minimum pH target throughout the leaching process, thereby sustaining a dynamic concentration to remove the oxide. The optimal leaching conditions were determined to be at 90°C at a minimum pH target of 2.5 for the SHS‐produced product. At these conditions, conversion percentages of 83%–84% of MgO were measured with only trace amounts of TiB2 measured in the solution (
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2008.02835.x