An advanced method to manufacture hierarchically structured carbide-derived carbon monoliths

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• 作者：Tobias Fey ; Bodo Zierath ; Andreas M. Kern ; Peter Greil ; Bastian J.M. Etzold
• 刊名：Carbon
• 出版年：April, 2014
• 年：2014
• 卷：70
• 期：Complete
• 页码：30-37
• 全文大小：1302 K

文摘

The preparation of carbide-derived carbon (CDC) monoliths with a hierarchically structure in the nm and 渭m range is presented. Basis is the manufacturing of porous cellular SiC ceramics based on a biomorphous approach with 渭m porosity and subsequent conformal conversion to CDC by reactive extraction with chlorine. The SiC ceramics can be sintered at low temperatures and short times (1500 掳C, 2 h) compared to classical preparation methods. The SiC ceramics show a macro pore volume (1-10 渭m channel size) of 0.56 ml g^鈭?, which corresponds to 1.5 ml g^鈭? in the resulting CDC. The final carbon material exhibits an additional nano pore volume of 0.525 ml g^鈭? with a mean slit pore size of 0.86 nm. Mechanical stabilities of the highly porous CDC are excellent (bending strength 2.1 卤 0.2 MPa, corrected Weibull modulus 8.7, characteristic strength 2.2 MPa and Youngs modulus 10.0 卤 0.5 GPa). The reactive extraction of the carbide monoliths shows very high reaction rates, approx. two dimensions faster (95脳) compared to non-porous samples. Thus the manufacturing of the structured carbide and CDC can be performed at lower costs.