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OALib Journal期刊
ISSN: 2333-9721
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溶胶-凝胶-碳热还原法制备富碳β-SiC纳米粉体
Abstract:
采用溶胶-凝胶-碳热还原法,以正硅酸乙酯和蔗糖为原料,在0.1MPaAr气气氛中碳热还原合成β-SiC纳米粉体。通过X射线衍射、Raman光谱、扫描电镜和透射电镜对β-SiC纳米粉体的物相、微观结构及形貌进行了表征。结果表明当合成温度为1600℃时,已经开始生成β-SiC相,随着温度升高至1700℃,完全生成了含有C_(Si)缺陷的富碳β-SiC相。β-SiC纳米粉体表现为纳米级的团聚颗粒,平均粒径为40nm,并生成晶须。对β-SiC纳米粉体的碳热还原反应机理进行了分析,结果表明溶胶-凝胶法明显降低了生成气态SiO控制反应的温度。
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