Synthesis of well-dispersed columnar Si3N4 using carbothermal reduction–nitridation method
Synthesis of well-dispersed columnar Si3N4 using carbothermal reduction–nitridation method
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DOI：
10.1016/j.powtec.2018.03.046
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发表时间：
2018-05
影响因子：
5.2
通讯作者：
Siyuan Sun;Qi Wang;Yiyao Ge;Zhaobo Tian;Jie Zhang;Z. Xie
中科院分区：
文献类型：
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作者：
Siyuan Sun;Qi Wang;Yiyao Ge;Zhaobo Tian;Jie Zhang;Z. Xie
氮化硅具有高导热性、高电阻率和低介电损耗等优点，作为导热填料受到了广泛的关注。采用碳热还原-氮化（CRN）法制备了分散良好的氮化硅柱状颗粒。柱状颗粒的平均直径为4 μm，长径比为3。初步提出了si3n4颗粒内在生长机理的推测。推测caf2可以通过V-L-S（汽-液-固）途径与SiO2形成含ca的液相，促进柱状结构β- si3n4的形成。此外，适当的caf2含量有利于制备分散性好的si3n4颗粒，因为Ca和F的蒸发速率合适。
Si3N4has attracted much attention as the thermally conductive fillers owing to its high thermal conductivity, high electrical resistivity and low dielectric loss. This paper presented the preparation of well-dispersed columnar Si3N4particles by carbothermal reduction–nitridation (CRN) strategy with assistance of unique CaF2additive under an elevated N2pressure. The average diameter of columnar particles was 4 μm and aspect ratio was 3. The speculation for the inherent growth mechanism of the Si3N4particles was tentatively proposed. It was speculated that CaF2could promote the formation of β-Si3N4with columnar structure through a V-L-S (vapor-liquid-solid) route by forming Ca-containing liquid phase with SiO2. Moreover, appropriate content of CaF2are beneficial for fabricating Si3N4particles with good dispersity because of the proper the evaporation rate of Ca and F.