竹炭から作製したチューブ状SiCセラミックスの微構造(<特集>セラミック材料)

概要

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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 SiO_2 as an amorphous state or SiC-SiO_2 with complex structure. The SiO_2 was formed easily because of residual oxygen in a furnace. The SiO_2 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 SiO_2 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.
社団法人日本材料学会の論文
2006-07-15