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http://dx.doi.org/10.3740/MRSK.2017.27.10.513

Fabrication of Tungsten Powder Mixtures with Nano and Micro Size by Reduction of Tungsten Oxides  

Kwon, Na-Yeon (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
Jeong, Young-Keun (Graduate School of Convergence Science, Pusan National University)
Oh, Sung-Tag (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
Publication Information
Korean Journal of Materials Research / v.27, no.10, 2017 , pp. 513-517 More about this Journal
Abstract
An optimum route to fabricate a hybrid-structured W powder composed of nano and micro size powders was investigated. The mixture of nano and micro W powders was prepared by a ball milling and hydrogen reduction process for $WO_3$ and W powders. Microstructural observation for the ball-milled powder mixtures revealed that the nano-sized $WO_3$ particles were homogeneously distributed on the surface of large W powders. The reduction behavior of $WO_3$ powder was analyzed by a temperature programmed reduction method with different heating rates in Ar-10% $H_2$ atmosphere. The activation energies for the reduction of $WO_3$, estimated by the slope of the Kissinger plot from the amount of reaction peak shift with heating rates, were measured as 117.4 kJ/mol and 94.6 kJ/mol depending on reduction steps from $WO_3$ to $WO_2$ and from $WO_2$ to W, respectively. SEM and XRD analysis for the hydrogen-reduced powder mixture showed that the nano-sized W particles were well distributed on the surface of the micro-sized W powders.
Keywords
nano and micron-sized W powder mixtures; ball milling of $WO_3$ powder; hydrogen reduction behavior; microstructure;
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