論文
竹炭から作製したチューブ状SiCセラミックスの微構造
2006 年 55 巻 7 号 p. 661-665
詳細
2006 年 55 巻 7 号 p. 661-665
Recently, SiC ceramic was synthesized from bamboo-charcoal and melted Si in an Ar atmosphere. The SiC formed around the inside pore of the bamboo-charcoal as a tubular ceramic. As a result, yield of the SiC ceramic reached about 30%. The product heated for various time (0.1h-5h) was analyzed by scanning- and transmission- electron microscopes with energy-dispersive spectroscopy. For 0.1 hour heating time, the product was composed of SiO2 as an amorphous state or SiC-SiO2 with complex structure. The SiO2 was formed easily because of residual oxygen in a furnace. The SiO2 was existed as a liquid phase at high temperature and accordingly the product shape was like a surface structure of bamboo-charcoal. Increasing the heating time, the SiO2 was reacted with C under Ar atmosphere and became SiC, and increased the SiC thickness < about 14μm. The SiC ceramic possessed 3C structure, and the tendency to decrease by heating was seen as for the stacking disorders in interguranular.
