Room-temperature mechanochemical synthesis of W                         2                         B                         5                          powders

Selim Coşkun; M. Lütfi Öveçoğlu

doi:10.1007/s11661-012-1551-4

Room-temperature mechanochemical synthesis of W ₂ B ₅ powders

Selim Coşkun, M. Lütfi Öveçoğlu

Department of Metallurgical and Materials Engineering

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12 Citations (Scopus)

Abstract

The mechanochemical synthesis of W ₂ B ₅ powders was successfully carried out at room temperature. WO _2.72 , B ₂ O ₃ and Mg powder blends were mixed to form batches according to the metallothermic reduction of WO _2.72 and B ₂ O ₃ with Mg, which were subsequently mechanically alloyed (MA) using a Spex mill at different durations to constitute W ₂ B ₅ + MgO as final products. Following mechanochemical synthesis, MgO was removed from the system by leaching the powders with HCl. Microstructural and morphological characterizations of boride powders were carried out via scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses. Moreover, atomic absorption spectroscopy (AAS) and differential scanning calorimetry (DSC) experiments were carried out to monitor the purity of the powders at different stages of the process. After mechanical alloying of the powder batches comprising 50 pct stoichiometrically excess amount of B ₂ O ₃ for 30 hours and leaching with a 7 M HCl solution, pure W ₂ B ₅ powders with an average particle size of 226 nm and an average grain size of 55.3 nm were successfully synthesized.

Original language	English
Pages (from-to)	1805-1813
Number of pages	9
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	44
Issue number	4
DOIs	https://doi.org/10.1007/s11661-012-1551-4
Publication status	Published - Apr 2013

Funding

The authors wish to express their thanks to the Scientific and Technological Research Council of Turkey (TUBİTAK) for the financial support under the project number 105M065. The laboratory equipment utilized in this study were purchased through the research grant 2001 K 750-90146 provided by State Planning Organization (DPT) and this is gratefully acknowledged. We would also like to thank Duygu Ag˘ aog˘ ulları for her help in leaching experiments.

Funders	Funder number
DPT
TUBİTAK	105M065, 2001 K 750-90146
Devlet Planlama Örgütü
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu

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10.1007/s11661-012-1551-4

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Coşkun, S., & Öveçoğlu, M. L. (2013). Room-temperature mechanochemical synthesis of W ₂ B ₅ powders Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 44(4), 1805-1813. https://doi.org/10.1007/s11661-012-1551-4

Coşkun, Selim ; Öveçoğlu, M. Lütfi. / Room-temperature mechanochemical synthesis of W ₂ B ₅ powders In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. 2013 ; Vol. 44, No. 4. pp. 1805-1813.

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abstract = " The mechanochemical synthesis of W 2 B 5 powders was successfully carried out at room temperature. WO 2.72 , B 2 O 3 and Mg powder blends were mixed to form batches according to the metallothermic reduction of WO 2.72 and B 2 O 3 with Mg, which were subsequently mechanically alloyed (MA) using a Spex mill at different durations to constitute W 2 B 5 + MgO as final products. Following mechanochemical synthesis, MgO was removed from the system by leaching the powders with HCl. Microstructural and morphological characterizations of boride powders were carried out via scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses. Moreover, atomic absorption spectroscopy (AAS) and differential scanning calorimetry (DSC) experiments were carried out to monitor the purity of the powders at different stages of the process. After mechanical alloying of the powder batches comprising 50 pct stoichiometrically excess amount of B 2 O 3 for 30 hours and leaching with a 7 M HCl solution, pure W 2 B 5 powders with an average particle size of 226 nm and an average grain size of 55.3 nm were successfully synthesized.",

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Coşkun, S & Öveçoğlu, ML 2013, ' Room-temperature mechanochemical synthesis of W ₂ B ₅ powders ', Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, vol. 44, no. 4, pp. 1805-1813. https://doi.org/10.1007/s11661-012-1551-4

Room-temperature mechanochemical synthesis of W ₂ B ₅ powders . / Coşkun, Selim; Öveçoğlu, M. Lütfi.
In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 44, No. 4, 04.2013, p. 1805-1813.

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

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AB - The mechanochemical synthesis of W 2 B 5 powders was successfully carried out at room temperature. WO 2.72 , B 2 O 3 and Mg powder blends were mixed to form batches according to the metallothermic reduction of WO 2.72 and B 2 O 3 with Mg, which were subsequently mechanically alloyed (MA) using a Spex mill at different durations to constitute W 2 B 5 + MgO as final products. Following mechanochemical synthesis, MgO was removed from the system by leaching the powders with HCl. Microstructural and morphological characterizations of boride powders were carried out via scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses. Moreover, atomic absorption spectroscopy (AAS) and differential scanning calorimetry (DSC) experiments were carried out to monitor the purity of the powders at different stages of the process. After mechanical alloying of the powder batches comprising 50 pct stoichiometrically excess amount of B 2 O 3 for 30 hours and leaching with a 7 M HCl solution, pure W 2 B 5 powders with an average particle size of 226 nm and an average grain size of 55.3 nm were successfully synthesized.

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Coşkun S, Öveçoğlu ML. Room-temperature mechanochemical synthesis of W ₂ B ₅ powders Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. 2013 Apr;44(4):1805-1813. doi: 10.1007/s11661-012-1551-4

Room-temperature mechanochemical synthesis of W ₂ B ₅ powders

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