Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 70, Issue -, Pages 93-100Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2017.09.010
Keywords
Tungsten; Sintering; Submicron; Oxidation, nanowire
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In this study, an interesting phenomenon was observed related to sintering of tungsten sub-micron powders in hydrogen atmosphere. Initial tungsten compacts containing 80 wt% micro powder and 20 wt% submicron particles (size of 100-600 nm) were sintered in hydrogen atmosphere. SEM, XRD and EDS analysis were used to studying the micro-structural details. The obtained results exhibited an interesting oxidation-condensation phenomenon in sintered specimens that resulted into formation of needle-like WO3 nanowires on the particle surfaces. Also, submicron particles accelerate the sintering of tungsten powders due to faceted-nonfaceted transformation mechanism. The obtained results proposed that oxygen content in initial powders can be considered as required oxygen source for nucleation and growth of WO3 nano-structure. In this condition, the nanowires extend via solid-phase growth from nanowire nuclei generated on the W particles surface.
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