Abstract
NiO nanoparticles of 20nm in diameter were spark plasma sintered between 400°C and 600°C for 5 and 10min durations. Application of 100MPa pressure from room temperature resulted in densities between 75% and 92%. The final grain size was between 26nm and 68nm. Lower densities were recorded when 100MPa was applied at the SPS temperature. Two shrinkage rate maxima of ∼3.4×10−3s−1 and ∼2×10−3s−1 were observed around 390±10°C and at the SPS temperature. The two shrinkage rate maxima were related to densification by particle sliding followed by diffusional grain boundary sliding during the heating. The strong effects of the surface and interfacial processes which are active during the SPS were highlighted.
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