Abstract 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.

中文翻译：

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精确控制的碳热合成球形 β-Si3N4 颗粒

摘要 通过精确调控的高效碳热还原氮化策略合成了高纯度球形 β-Si3N4 颗粒。结果表明，适当比例的纳米级反应物对于获得纯β相的Si3N4颗粒具有重要意义。β-Si3N4 颗粒的 c/a,b 轴长度比可以通过使用各种添加剂进行调节。通过LS机制，只有在CaO添加剂的帮助下才能获得细小的球形β-Si3N4颗粒。此外，全面揭​​示了改变原材料时潜在反应机制的变化。由于高纯度和精细的球形形态，所获得的 β-Si3N4 粉末是制备具有高导热率的树脂基复合材料的有前途的填料。