The effect of additives on the morphology of combustion synthesized rod-like β-Si3N4 crystals

This paper presents the results of synthesizing rod-like β-Si3N4 crystals by combustion synthesis with (Y2O3+Al2O3) or (Y2O3+MgO) as additives. The Mg-doping sample forms a more uniform and regular microstructure (∼10 μm) than that of the Al-doping sample(5–10 μm), while both additives had marked effects on the growth of rod-like β-Si3N4 crystals compared with those without additives, for the viscosity of Mg-containing liquid phase is lower than that of Al-containing liquid phase.