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.
|Number of pages||5|
|Journal||Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing|
|State||Published - 15 Mar 2011|
Bibliographical noteFunding Information:
The financial support by the Israel Ministry of Science under Contract #3-3429 and Swedish Research Council are gratefully acknowledged.
- Particle sliding
- Spark plasma sintering
ASJC Scopus subject areas
- Materials Science (all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering