Authors: Y Zhong L Shaw
Publish Date: 2010/10/30
Volume: 46, Issue: 19, Pages: 6323-6331
Abstract
The formation of the nanostructured WC–10 wt Co powder from WO3 Co3O4 and graphite is studied The effects of the processing parameters of highenergy ball milling reduction in H2 atmosphere and carburization in Ar/CO atmosphere are investigated The crystallite size of the assynthesized WC is 30–40 and 40–50 nm for 900 and 1000 °C carburized powders respectively The powder is agglomerated with the size of the primary particles ranging from 50 to 700 nm Highenergy ball milling of WO3–Co3O4–C powder mixtures leads to finer particle and crystallite sizes with larger surface area Such milled powders can be reduced to nanostructured W at 570 °C and carburized to form WC at temperatures as low as 900 °C Crystal growth has taken place during carburization particularly at 1000 °C which results in the formation of truncated triangular prisms and nanoplates of WC at 1000 °C
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