Biswas, Krishanu and Mukhopadhyay, Amartya and Basu, Bikramjit and Chattopadhyay, Kamanio (2007) Densification and microstructure development in spark plasma sintered WC–6 wt% $ZrO_2$ nanocomposites. In: Journal of Materials Research, 22 (6). pp. 1491-1501.
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In this paper, we report the results of a transmission electron microscopy investigation on WC–6 wt% $ZrO_2$ nanocomposite, spark plasma sintered at 1300 °C, for varying times of up to 20 min. The primary aim of this work was to understand the evolution of microstructure during such a sintering process. The investigation revealed the presence of nanocrystalline $ZrO_2$ particles (30–50 nm) entrapped within submicron WC grains. In addition, relatively coarser $ZrO_2$ (60–100 nm) particles were observed to be either attached to WC grain boundaries or located at WC triple grain junctions. The evidence of the presence of a small amount of $W_2C$, supposed to have been formed due to sintering reaction between WC and $ZrO_2$, is presented here. Detailed structural investigation indicated that $ZrO_2$ in the spark plasma sintered nanocomposite adopted an orthorhombic crystal structure, and the possible reasons for $o-ZrO_2$ formation are explained. The increase in kinetics of densification due to the addition of $ZrO_2$ is believed to be caused by the enhanced diffusion kinetics in the presence of nonstoichiometric nanocrystalline $ZrO_2$.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Materials Research Society (MRS).|
|Department/Centre:||Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)|
|Date Deposited:||24 Oct 2007|
|Last Modified:||19 Sep 2010 04:38|
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