Effect of Heating Rate on Spark Plasma Sintering of a Nanosized β‐Si 3 N 4 ‐Based Powder
- 10 November 2010
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 94 (4) , 1182-1190
Abstract
A nanosized β‐Si 3 N 4 ‐based powder doped with sintering additives of 6 wt% Al 2 O 3 and 8 wt% Y 2 O 3 were sintered by spark plasma sintering at different heating rates. The in situ shrinkage curves were measured to identify the densification mechanism during the rise in temperature. At slower heating rates (50 and 100°C/min), the nanosized grains are maintained after sintering at 1600°C for 5 min, while anisotropic grain growth is accelerated above 1500°C by applying a rapid heating cycle (200°C/min). In addition to the dynamic Ostwald ripening that occur during the sintering process, the presence of Morié fringes and dislocations is attributed to grain rotation and misfit strain between the subgrains and elongated, large grains. Grain coalescence is found to occur in the rapid heating process.Keywords
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