Abstract
Micron-sized β-Si3N4 powders with tailored morphology were successfully synthesized by carbothermal reduction–nitridation (CRN) strategy. β-Si3N4 granules with low aspect ratios were prepared with 10mol% of CaO additive and the size of particles could be regulated by altering N2 pressures. β-Si3N4 particles with high aspect ratios were synthesized when the content of CaO was less than 5%. Increasing content of additive could reduce the diameter of β-Si3N4 granules. More significantly, the underlying growth mechanism of the β-Si3N4 was tentatively put forward.
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