Authors: Taegong Ryu H Y Sohn YoungUgk Kim Miguel OlivasMartinez
Publish Date: 2010/02/10
Volume: 12, Issue: 8, Pages: 2851-2857
Abstract
Nanosized tungsten carbide and cobalt composite powder was synthesized by a twostep reaction via a thermal plasma process Ammonium paratungstate APT and cobalt oxide were used as the precursors The injected precursors were vaporized in the plasma flame and the subsequent reduction of the vaporized precursors produced uniformly mixed nanosized tungsten and cobalt composite powder The subsequent carburization of this powder by CH4–H2 mixture resulted in the formation of nanosized WC–Co composite powder with a particle size 110 nm This new method represents an alternative route that avoids the posttreatment required for the WC1−x produced when methane was used for direct carburization in the powder production stepThe authors wish to thank Prof Patrick R Taylor of Colorado School of Mines for his help with the selection design and initial operation of the plasma reactor system The authors also wish to thank Mr Robert W Byrnes of the University of Utah for his competent work with the design and repair of the experimental facilities
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