Synthesis of Uniform α-Si<sub>3</sub>N<sub>4</sub> Nanospheres by RF Induction Thermal Plasma and Their Application in High Thermal Conductive Nanocomposites

Wang

et al. 2018

Single‐crystal β‐Si3N4 particles with a quasi‐spherical morphology were synthesized via an efficient carbothermal reduction‐nitridation (CRN) strategy. The β‐Si3N4 particles synthesized under an N2 pressure of 0.3 MPa, at 1450°C and with 10 mol% unique CaF2 additives showed good dispersity and an average size of about 650 nm. X‐ray photoelectron spectroscopy analysis revealed that there was no SiC or Si–C–N compounds in the β‐Si3N4 products. Selected‐area electron‐diffraction pattern and high‐resolution image indicated single crystalline structure of the typical β‐Si3N4 particles without an obvious amorphous oxidation layer on the surface. The growth mechanism of the quasi‐spherical β‐Si3N4 particles was proposed based on the transmission electron microscopy and energy dispersive X‐ray spectroscopy characterization, which was helpful for controllable synthesis of β‐Si3N4 particles by CRN method. Owing to the quasi‐spherical morphology, good dispersity, high purity, and single‐crystal structure, the submicro‐sized β‐Si3N4 particles were promising fillers for preparing resin‐based composites with high thermal conductivity.

Section: Introductionmentioning

confidence: 99%

Synthesis and growth mechanism of single crystal β‐Si₃N₄ particles with a quasi‐spherical morphology

Wang

et al. 2018

“…8,11 The overall reaction during the CRN process can be described as the equation (1): 8,11 The overall reaction during the CRN process can be described as the equation (1):…”

Section: Introductionmentioning

confidence: 99%

Synthesis and growth mechanism of approximate spherical β‐Si₃N₄particles via carbothermal reduction‐nitridation method

Wang

et al. 2017

In this work, an efficient carbothermal reduction‐nitridation (CRN) strategy was rationally designed to directly synthesize β‐Si3N4 powders with eminent dispersity and granularity uniformity. With the aid of CaO additive, the obtained β‐Si3N4 particles were endowed with approximate spherical morphology and smooth surface. The size of β‐Si3N4 particles could be regulated in submicro and microscale by altering N2 pressures. More significantly, the underlying growth mechanism of the β‐Si3N4 under elevated N2 pressure was comprehensively analyzed and tentatively put forward. Benefiting from the remarkable merits, the as‐synthesized β‐Si3N4 powders showed great potential for alternative fillers in the application of high thermal conductivity plastic packages.

“…1 When utilizing Si 3 N 4 as fillers, several principles should be followed. 1 When utilizing Si 3 N 4 as fillers, several principles should be followed.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of well‐dispersed β‐Si₃N₄ with equiaxed structures using carbothermal reduction–nitridation method

Tian

et al. 2017

Well‐dispersed β‐Si3N4 powders with a novel equiaxed structure and eminent crystal integrity were prepared by carbothermal reduction–nitridation (CRN) strategy with the assistance of CaF2 additive. The growth mechanism of Si3N4 particles in the CRN process was elucidated. It is proposed that the liquid phase formed by SiO2 and CaF2 additive is crucial to the formation of equiaxed β‐Si3N4, and with an appropriate content of CaF2, Si3N4 powders with pure β phase, superior dispersity and crystal integrity can be obtained.