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Resistance Sintering Under Ultra High Pressure: A New Approach to Produce Bulk Nanocrystalline Refractory Metal

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Several different types of commercially available grades of W and Mo powders with nano size (50 nm) and micro size (0.2∼3 μm) were sintered by a novel sintering method named as resistance sintering under ultra high pressure in the absence of additive. The sintering effect was characterized through microstructure observation and testing the mechanical properties. It is finds that as very short sintering time (less than 1 min.) is needed, this novel method is an effective technology to fabricate nanocrystalline refractory metal. Density greater than 90% theoretical density was achieved, while the grain size still remained about 50 nm, this grain size is substantially smaller than previously reported. The sintering mechanism of this sintering method is very different from the conventional sintering methods and was primarily analyzed in this paper.
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Document Type: Research Article

Publication date: February 1, 2009

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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