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Preparation of Biomorphic SiC/C Ceramics from Pine Wood via Supercritical Ethanol Infiltration

机译:超临界乙醇浸渗法制备松木生物形态SiC / C陶瓷。

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摘要

生物形态(导出的木头)有在 theSiC/C 的一篇全面作文的碳化物陶艺被低 viscositytetraethylorthosilicate/supercritical 乙醇的超级批评乙醇渗入生产进生物学上导出的碳模板(C_B模板)并且在 situ 水解作用进 Si (哦)_4胶化, Si (哦)_4胶化在 1400 ℃ 被锻烧支持 Si 的 polycondensation (哦)_4胶化进SiO_2阶段然后碳有进高度多孔的、生物形态的 SiC/C c 的简历碳模板的 SiO_2 的热减小产生多孔的 SiC/C 陶艺的阶段和形态学变换机制被 X-raydiffraction (XRD ) 调查了,扫描电子显微镜学(SEM ) ,传播电子显微镜学(TEM ) , andFourier 变换红外线光谱学(英尺红外) 。试验性的结果证明松木头炭的生物形态的细胞的形态学在与原文如此与少数α - 原文如此由β - 组成了的高精确和遗体陶器的多孔的 SiC/C 被仍然是免费的碳在非结晶的阶段存在。
机译:Biomorphic (wood derived) carbide ceramics with an overall composition in the SiC/C was produced by supercritical ethanol infiltration of low viscosity tetraethylorthosilicate/supercritical ethanol into biologically derived carbon templates (CB-templates) and in situ hydrolysis into Si(OH)4-gel, the Si(OH)4-gel was calcined at 1400℃ to promote the polycondensation of Si(OH)4-gel into SiO2-phase and then carbonthermal reduction of the SiO2 with the biocarbon template into highly porous, biomorphic SiC/C ceramics. The phases and morphology conversion mechanism of resulting porous SiC/C ceramics have been investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FT-IR). Experimental results showed that the biomorphic cellular morphology of pinewood charcoal was remained in the porous SiC/C ceramic with high precision that consisted of β-SiC with minority of α-SiC and the remain free carbon existed in amorphous phase.

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