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Room-Temperature Mechanochemical Synthesis of W2B5 Powders

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Abstract

The mechanochemical synthesis of W2B5 powders was successfully carried out at room temperature. WO2.72, B2O3 and Mg powder blends were mixed to form batches according to the metallothermic reduction of WO2.72 and B2O3 with Mg, which were subsequently mechanically alloyed (MA) using a Spex mill at different durations to constitute W2B5 + 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 B2O3 for 30 hours and leaching with a 7 M HCl solution, pure W2B5 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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Acknowledgments

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 Ağaoğulları for her help in leaching experiments.

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Authors and Affiliations

  1. Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, U.K.

    Selim Coşkun (Postdoctoral Research Associate)

  2. Department of Metallurgy and Materials Engineering, Particulate Materials Laboratories, Istanbul Technical University, ITU Ayazaga Kampusu Maslak, 34469, Maslak, Istanbul, Turkey

    Selim Coşkun (Postdoctoral Research Associate) & M. Lütfi Öveçoğlu (Professor)

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  1. Selim Coşkun
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  2. M. Lütfi Öveçoğlu
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Correspondence to Selim Coşkun.

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Manuscript submitted May 23, 2012.

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Coşkun, S., Öveçoğlu, M.L. Room-Temperature Mechanochemical Synthesis of W2B5 Powders. Metall Mater Trans A 44, 1805–1813 (2013). https://doi.org/10.1007/s11661-012-1551-4

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