Abstract
The densification and grain growth behavior of a ZnS nanopowder during spark plasma sintering (SPS) were investigated under the pressure of 125 MPa and constant heating rate of 25 °C min−1. At a sintering temperature of 550 °C, almost fully dense ZnS ceramics (98.2%) could be obtained with grain size as low as 75 nm. At higher temperature, ZnS is subject of a very important grain growth that is detrimental to the mechanical properties. A maximum Vickers microhardness of 4.2 GPa was measured, which is 70% higher than the current state of the art. Retaining the grain size below 100 nm appears to be the key to developing competitive ZnS functional ceramics.
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