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Room temperature reduction of scheelite (CaWO4)

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Abstract

A mixture of scheelite and magnesium has been mechanically milled together for 100 h, either with graphite or in a nitrogen atmosphere, with the intention of forming tungsten carbide or nitride. The resultant powders were examined by thermal analysis, isothermal annealing, and x-ray diffraction to determine the effect of milling on the reduction of scheelite. With graphite, nanocrystallite W2C was the exclusive tungsten product; WC was not detected even after annealing at 1000 °C. No nitride formed in the system milled with nitrogen; however, 10 nm crystallites of elemental tungsten were formed. The unwanted phases, MgO and CaO, were readily removed by leaching in acid, leaving a fine powder composed of impact welded aggregates of either carbide or 99% pure tungsten metal.

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  1. Petrochemistry and Experimental Petrology, Research School of Earth Sciences and Department of Electronic Materials Engineering, Research School of Physical Sciences and Engineering, Australian National University, ACT 0200, Canberra, Australia

    N. J. Welham

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Welham, N.J. Room temperature reduction of scheelite (CaWO4). Journal of Materials Research 14, 619–627 (1999). https://doi.org/10.1557/JMR.1999.0088

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  • DOI: https://doi.org/10.1557/JMR.1999.0088

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