Synthesis and growth mechanism of approximate spherical β‐Si3N4 particles via carbothermal reduction‐nitridation method

Abstract In this work, an efficient carbothermal reduction‐nitridation (CRN) strategy was rationally designed to directly synthesize β‐Si 3 N 4 powders with eminent dispersity and granularity uniformity. With the aid of CaO additive, the obtained β‐Si 3 N 4 particles were endowed with approximate spherical morphology and smooth surface. The size of β‐Si 3 N 4 particles could be regulated in submicro and microscale by altering N 2 pressures. More significantly, the underlying growth mechanism of the β‐Si 3 N 4 under elevated N 2 pressure was comprehensively analyzed and tentatively put forward. Benefiting from the remarkable merits, the as‐synthesized β‐Si 3 N 4 powders showed great potential for alternative fillers in the application of high thermal conductivity plastic packages.