Synthesis of magnesium borates by mechanically activated annealing

Duygu Aǧaoǧullari; Özge Balci; Hasan Gökçe; Ismail Duman; M. Lütfi Öveçoǧlu

doi:10.1007/s11661-012-1109-5

Synthesis of magnesium borates by mechanically activated annealing

Duygu Aǧaoǧullari^*, Özge Balci, Hasan Gökçe, Ismail Duman, M. Lütfi Öveçoǧlu

^*Corresponding author for this work

Department of Metallurgical and Materials Engineering

Istanbul Technical University

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

Different magnesium borate compounds such as MgB ₄O ₇, Mg ₂B ₂O ₅, and Mg ₃B ₂O ₆ were synthesized from B ₂O ₃/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 B ₂O ₃/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 B ₂O ₃/MgO powder blends were interpreted by thermochemical software. MgB ₄O ₇ and Mg ₂B ₂O ₅ crystalline phases were identified in the M2A'd powders in the B ₂O ₃/MgO mole ratios of 1/1, 1/2, and 2/1. Mg ₂B ₂O ₅ and Mg ₃B ₂O ₆ crystalline phases were detected in the M2A'd B ₂O ₃/MgO: 1/3 powders in addition to unreacted MgO.

Original language	English
Pages (from-to)	2520-2533
Number of pages	14
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	43
Issue number	7
DOIs	https://doi.org/10.1007/s11661-012-1109-5
Publication status	Published - Jul 2012

Funding

The authors thank Aziz Genc¸ 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.

Funders	Funder number
Al-Cu Based Metal Matrix Composites via Powder Metallurgy Techniques	90189
DPT	2001K120750
Devlet Planlama Örgütü

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title = "Synthesis of magnesium borates by mechanically activated annealing",

abstract = "Different magnesium borate compounds such as MgB 4O 7, Mg 2B 2O 5, and Mg 3B 2O 6 were synthesized from B 2O 3/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 B 2O 3/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 B 2O 3/MgO powder blends were interpreted by thermochemical software. MgB 4O 7 and Mg 2B 2O 5 crystalline phases were identified in the M2A'd powders in the B 2O 3/MgO mole ratios of 1/1, 1/2, and 2/1. Mg 2B 2O 5 and Mg 3B 2O 6 crystalline phases were detected in the M2A'd B 2O 3/MgO: 1/3 powders in addition to unreacted MgO.",

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AU - Duman, Ismail

AU - Öveçoǧlu, M. Lütfi

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N2 - Different magnesium borate compounds such as MgB 4O 7, Mg 2B 2O 5, and Mg 3B 2O 6 were synthesized from B 2O 3/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 B 2O 3/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 B 2O 3/MgO powder blends were interpreted by thermochemical software. MgB 4O 7 and Mg 2B 2O 5 crystalline phases were identified in the M2A'd powders in the B 2O 3/MgO mole ratios of 1/1, 1/2, and 2/1. Mg 2B 2O 5 and Mg 3B 2O 6 crystalline phases were detected in the M2A'd B 2O 3/MgO: 1/3 powders in addition to unreacted MgO.

AB - Different magnesium borate compounds such as MgB 4O 7, Mg 2B 2O 5, and Mg 3B 2O 6 were synthesized from B 2O 3/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 B 2O 3/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 B 2O 3/MgO powder blends were interpreted by thermochemical software. MgB 4O 7 and Mg 2B 2O 5 crystalline phases were identified in the M2A'd powders in the B 2O 3/MgO mole ratios of 1/1, 1/2, and 2/1. Mg 2B 2O 5 and Mg 3B 2O 6 crystalline phases were detected in the M2A'd B 2O 3/MgO: 1/3 powders in addition to unreacted MgO.

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Synthesis of magnesium borates by mechanically activated annealing

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