Effect of Heat Treatment on Crystallite Size and Grain Morphology of Silicon Carbide Synthesized from Carbon-Silica Hybrid Precursors
Effect of Heat Treatment on Crystallite Size and Grain Morphology of Silicon Carbide Synthesized from Carbon-Silica Hybrid Precursors
复制标题
热处理对碳-硅杂化前驱体合成碳化硅晶粒尺寸和晶粒形貌的影响
DOI：
10.2109/jcersj.107.285
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发表时间：
1999
影响因子：
1.1
通讯作者：
Y. Kurachi
中科院分区：
文献类型：
--
作者：
M. Narisawa;Y. Okabe;K. Okamura;Y. Kurachi
通过烧成由交联型酚醛树脂和硅胶组成的杂化凝胶，制备了不同碳含量的碳化硅杂化前驱体。用X射线衍射仪和扫描电子显微镜观察了这些前驱体在1873K时的碳化硅析出过程。系统中过量的碳减小了热处理过程中形成的碳化硅微晶的尺寸。高碳含量的前驱体经长期热处理后，可获得由细小的碳化硅微晶组成的聚集态颗粒，而低碳含量的前驱体可获得100~200 nm的粗大孤立颗粒。
Carbon-silica hybrid precursors for SiC with different carbon contents were prepared by firing hybrid gels consisting of crosslinked phenol resin and silica gel. The SiC precipitation processes in these precursors at 1873K were traced in terms of X-ray diffraction and scanning electron microscope (SEM) observation. Excess carbon in the system reduces the size of the formed SiC crystallite during the heat treatment. The precursor with high carbon content yielded aggregated grains consisting of small SiC crystallite, while the precursor with low carbon content yielded coarse isolated grains of 100-200nm after a long-term of heat treatment.