Abstract
Different magnesium borate compounds such as MgB4O7, Mg2B2O5, and Mg3B2O6 were synthesized from B2O3/MgO powder blends by mechanically activated annealing (M2A). Milling experiments were carried out in a SPEX 8000 D Mixer/Mill, and mechanically activated powders were subsequently annealed under air. The effects of B2O3/MgO mole ratios (1/1, 1/2, 1/3, and 2/1), milling durations (30 minutes and 1 and 2 hours), annealing durations (2 and 5 hours), and annealing temperatures (973 K, 1173 K, and 1273 K (700 °C, 900 °C, and 1000 °C)) on the formation and microstructure of magnesium borates were investigated. Compositional, microstructural, and thermal characterizations were conducted by X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Temperature-product mole amount relations of the B2O3/MgO powder blends were interpreted by thermochemical software. MgB4O7 and Mg2B2O5 crystalline phases were identified in the M2A’d powders in the B2O3/MgO mole ratios of 1/1, 1/2, and 2/1. Mg2B2O5 and Mg3B2O6 crystalline phases were detected in the M2A’d B2O3/MgO: 1/3 powders in addition to unreacted MgO.
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Acknowledgments
The authors thank Aziz Genç for his help during TEM characterizations. We also acknowledge the State Planning Organization (DPT) for funding the projects entitled “Advanced Technologies in Engineering” with the Project No. 2001K120750 and “Development of Al-Cu Based Metal Matrix Composites via Powder Metallurgy Techniques” with the Project No. 90189 out of which the main infrastructure of the Particulate Materials Laboratories was founded.
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Manuscript submitted October 4, 2011.
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Ağaoğullari, D., Balci, Ö., Gökçe, H. et al. Synthesis of Magnesium Borates by Mechanically Activated Annealing. Metall Mater Trans A 43, 2520–2533 (2012). https://doi.org/10.1007/s11661-012-1109-5
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DOI: https://doi.org/10.1007/s11661-012-1109-5