Abstract
The densification of high energy ball milled Si3N4 nanopowders through spark plasma sintering was investigated. Nanoceramics of Si3N4, with fine microstructure, comprising of grains with a diameter of ∼70 nm, were produced after sintering at 1600°C for 5 min in N2 atmosphere with a fast heating rate of 300 K min−1. The size and the aspect ratio of Si3N4 grains increased with decreasing heating rate and increasing holding time and temperature. Post-annealing of sintered ceramics at 1850°C for 3 h favoured development of a self-reinforced bimodal microstructure containing large elongated grains.
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