Carbothermal synthesis of approximately spherical Si3N4 particles with homogeneous size distribution
Carbothermal synthesis of approximately spherical Si3N4 particles with homogeneous size distribution
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碳热合成具有均匀尺寸分布的近似球形 Si3N4 颗粒
DOI：
10.1016/j.ceramint.2018.09.046
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发表时间：
2018-12
影响因子：
5.2
通讯作者：
Zhaoying Guo
中科院分区：
文献类型：
--
作者：
Qi Wang;Siyuan Sun;Sen Li;Zhaoying Guo
采用改进的碳热法，采用高压N2和CaF 2、Y2 O3复合添加剂，成功制备了形貌近似球形、分散性好、粒度分布均匀的Si 3 N4颗粒。研究了氮气压力、添加剂和温度等工艺参数对碳热还原氮化（CRN）过程的影响。在大量研究的基础上，揭示了Si_3N_4颗粒的形成机理。结果表明，在充分的液相包覆下，Si_3N_4以气-液-固（V-L-S）机制成核和生长，是合成均匀、近似球形、分散性好的颗粒的必要条件。由于Si 3 N4颗粒良好的形貌，其作为导热填料应用于下一代热界面材料具有很大的潜力。
Si3N4particles with approximately spherical appearance, good dispersity, and homogeneous particle size distribution were successfully fabricated by a modified carbothermal method with the use of high-pressure N2and composite additives CaF2and Y2O3. The effects of parameters such as N2gas pressure, additive, and temperature on the carbothermal reduction-nitridation (CRN) process were examined in detail. Based on extensive investigations, the mechanism of formation of Si3N4particles was revealed. It was found that the process of nucleation and growth of Si3N4viathe vapour-liquid-solid (V-L-S) mechanism under sufficient liquid encapsulation was essential for synthesising uniform particles with approximately spherical morphology and good dispersity. Because of the favourable morphology, the as-prepared Si3N4particles exhibited great potential as thermally conductive fillers for next generation thermal interface materials.
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