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- W2039515248 abstract "Abstract The nanocomposite WC–MgO powders were prepared at room temperature by reactive milling of low-cost WO 3 , Mg and graphite powders under argon gas atmosphere in a planetary ball milling. Powder samples were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The milling energy was calculated using a collision model and the milling energy maps were attained. The effects of milling parameters (including milling speed, ball-to-powder weight ratio and milling time) on the formation mechanism have been illuminated by the obtained milling energy maps. Results show that WC–MgO can be formed via Self-propagation High-temperature Synthesis (SHS) when the effective extensive factor E b is above 38.24 kJ g −1 s −1 , and it also can be formed from gradual reaction when E b is between 22.12 kJ g −1 s −1 and 38.24 kJ g −1 s −1 . As the energy map demonstrates, the total energy E t required for fabricating WC–MgO through SHS ranges from 25.61 × 10 6 kJ g −1 to 61.82 × 10 6 kJ g −1 , while more than 112.83 × 10 6 kJ g −1 is necessary for gradual reaction one. These milling energy maps are proposed as a tool for better understanding of the synthesis and formation of WC–MgO by high-energy reactive milling." @default.
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- W2039515248 date "2009-06-01" @default.
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- W2039515248 title "Synthesis and formation mechanisms of nanocomposite WC–MgO powders by high-energy reactive milling" @default.
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- W2039515248 doi "https://doi.org/10.1016/j.jallcom.2008.11.100" @default.
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