Nanocarbon-dependent synthesis of one-dimensional bead-chain-like ¦Â-SiC

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• 作者：Bin Zhao ; Biyun Yang ; Tingyu Wang ; Dongfeng Sun ; Yongzhen Hu ; Ruixing Li ; Shu Yin ; Junping Li ; Zhihai Feng ; Huiping Duan ; Qing Tang ; Tsugio Sato
• 关键词：¦Â-SiC ; Crystal morphology ; Amorphous materials ; Nanocarbon ; Carbothermal reduction
• 刊名：Powder Technology
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：246
• 期：Complete
• 页码：487-491
• 全文大小：1397 K

文摘

Thermodynamically, SiO₂ should react with carbon to form CO and SiC at and above a temperature of 1515 ¡ãC. However, this reaction is incomplete at 1550 ¡ãC, even with the use of metastable reactants, such as amorphous SiO₂ and active carbon powders. In contrast, complete decomposition of SiO₂ is achieved at 1450 ¡ãC using nanocarbon powders instead of active carbon. Additionally, to clarify the effects of size and morphology of SiO₂ on the SiC product, we synthesized different SiO₂ precursors. Experimental results reveal that the effects of porous SiO₂ on both the size and morphology of SiC particles are evident, but not a decrease in carbothermal reduction temperature. Nanocarbon powders reduce the temperature required for the reaction and also strongly affect the transformation kinetics.