Emulsion processing of polymer-derived porous Si/C/(O) ceramic bodies

被引：31

作者：

Bakumov, Vadym ^{[1
]}

Schwarz, Marcus ^{[1
]}

Kroke, Edwin ^{[1
]}

机构：

[1] Tech Univ Bergakad Freiberg, Inst Inorgan Chem, D-09596 Freiberg, Germany

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2009年 / 29卷 / 13期

关键词：

Shaping; Templating; Porosity; Carbides; Substrates; SILICON-CARBIDE; PRECERAMIC POLYMERS; POLYCARBOSILANE; CONVERSION; FOAMS; FABRICATION; PRECURSOR;

D O I：

10.1016/j.jeurceramsoc.2009.04.004

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A novel route of miniemulsion processing was applied to preceramic polymers in order to fabricate porous Si/C/(O) bodies. Commercially available polysiloxane and polycarbosilane precursors and water were emulsified via intensive stirring or ultrasonication in the presence of surfactants, and subsequently shaped and cured in an autoclave. The resulting green bodies were dried and pyrolytically converted at 700 and 1050 degrees C under nitrogen into ceramic counterparts retaining their shape. A fine interconnected pore network derived from the aqueous phase allows escape of gaseous decomposition products during pyrolysis and avoids cracking. In the presence of transition metals such as Fe, Co, Ni or Pd nanofibers consisting of beta-SiC/a-SiO2 are formed. Effects of polymer viscosity and processing parameters on the microstructures, porosities and pore sizes of the resulting products were investigated by means of DLS, mercury porosimetry, SEM, TEM, XRD and FTIR. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：2857 / 2865

页数：9

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