The Microstructure and thermal diffusivity of carbon nanostructures/Si₃N₄ composites processed using spark plasma sintering

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• 作者：Yongxia Li ; Wenbo Han ; ^{wbhan@hit.edu.cn} ; Guiqing Chen ; Yehong Cheng ; Qiang Yang
• 关键词：A. Sintering ; B. Microstructure-final ; C. Thermal properties ; D. Si3N4
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：15 February 2017
• 年：2017
• 卷：43
• 期：3
• 页码：3435-3438
• 全文大小：843 K
• 卷排序：43

文摘

Graphene nanoribbons (GNRs) were obtained by unzipping multiwall carbon nanotubes (MWCNTs). Three different silicon nitride-carbon nanostructures were prepared by spark plasma sintering (SPS): ceramic composites that contained 1 wt% carbon nanofibers (CNFs), 1 wt% MWCNTs and 1 wt% GNRs respectively. The α to β-Si3N4 transformation ratio and thermal diffusivity of GNR/Si3N4 composites were higher than both CNF/Si3N4 composites and MWCNT/Si3N4 composites. Furthermore, the higher thermal diffusivities of GNR/Si3N4 composites can primarily be attributed to the higher number of elongate β-Si3N4 grains.