Abstract
The early-stage sintering behaviours of 3 mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) ceramics during spark plasma sintering (SPS) was investigated using different pressure and heating regimes.It was found that dependent neither on pressure value (20~100 MPa) nor heating rates higher than 50 °C/min, the maximum densification rate had always been observed at rather similar ~78% of theoretical density (TD), where the grain growth was rather moderate. A novel intensive-particle-rearrangement mechanism was proposed to dominate the rapid densification of early-stage SPS process, by which yielded the considerable faster densification rate than those achievable by diffusion-related processes.Present findings showed the possibility of particle rearrangement in high density compacts and the effects of classic particle rearrangement should be re-evaluated in nanoceramic sintering.
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