Precisely controlled carbothermal synthesis of spherical β-Si3N4 granules

High purity spherical β-Si3N4 particles were synthesized via an efficient carbothermal reduction–nitridation strategy by precise regulation. The results showed that nano-sized reactants with an appropriate ratio was significant for acquiring Si3N4 granules with pure β phase. c/a,b-axis length ratio...

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Bibliographic Details
Published inCeramics international Vol. 46; no. 8; pp. 10879 - 10884
Main Authors Sun, Si-Yuan, Xie, Zhi-peng, Chen, Ke-Xin
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.06.2020
Subjects
Powders
Silicon nitride
Thermal conductivity
Thermal conductivity
Powders
Silicon nitride
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Summary:High purity spherical β-Si3N4 particles were synthesized via an efficient carbothermal reduction–nitridation strategy by precise regulation. The results showed that nano-sized reactants with an appropriate ratio was significant for acquiring Si3N4 granules with pure β phase. c/a,b-axis length ratio of the β-Si3N4 particles could be adjusted by using various additives. Fine spherical β-Si3N4 particles can only be obtained with the help of CaO additive by L-S mechanism. Moreover, variations of underlying reaction mechanisms when changing the raw materials were comprehensively revealed. Owing to the high purity and fine spherical morphology, as-obtained β-Si3N4 powders are promising fillers for preparing resin-based composites with high thermal conductivities.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2020.01.100