Abstract
Microstructural characterization is performed on two dense Si3N4 ceramic samples consolidated by spark plasma sintering (SPS): one fabricated using α-Si3N4 and the other using β-Si3N4 as the starting powder. A novel mechanism is revealed where ordered coalescence of nanoβ-crystallites accelerate the rapid β-Si3N4 anisotropic grain growth. The rapid α- to β-Si3N4 phase transformation via a high supersaturation of dissolved Si3N4 in the melt favors this mechanism. The high heating rate by SPS is essential for achieving such supersaturation.
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