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Wood-derived porous ceramics via infiltration of SiO2-Sol and carbothermal reduction

Klingner, Raoul, Sell, Juergen, Zimmermann, Tanja, Herzog, Andreas, Vogt, Ulrich, Graule, Thomas, Thurner, Philipp, Beckmann, Felix and Müller, Bert (2003) Wood-derived porous ceramics via infiltration of SiO2-Sol and carbothermal reduction Holzforschung, 57, (4), pp. 440-446. (doi:10.1515/HF.2003.065).

Record type: Article


The use of wood as a structure-giving material may be the key to producing temperature-resistant ceramics featuring high and directed porosity combined with necessary strength. The objective of this study was to develop a simple process to convert the evolutionarily optimized material wood into highly porous ceramics. Beech and pine, known to be relatively permeable, were pyrolyzed in a nitrogen atmosphere. The carbon-templates formed were infiltrated with various kinds of silica sol (SiO2). The resulting SiO2/C composite was transformed into a SiC-ceramic (silicon carbide) via carbothermal reduction. Through the described process the macroscopic pore-structure of wood was transformed exactly into SiC. The SiC-ceramic produced proved to be thermo-resistant. It remained stable in oxygen atmosphere at 1200°C, after a SiO2 coating around the SiC had been formed. This study focused on the alteration of the cell wall microstructure during the conversion of wood into SiC. Furthermore, the optimization of the individual process steps, pyrolysis, infiltration and ceramization along the most efficient route was pursued.

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Published date: June 2003


Local EPrints ID: 48953
ISSN: 0018-3830
PURE UUID: 33777929-ebd3-4dce-9967-94e1bdf77fb6

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Date deposited: 18 Oct 2007
Last modified: 17 Jul 2017 14:57

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Author: Raoul Klingner
Author: Juergen Sell
Author: Tanja Zimmermann
Author: Andreas Herzog
Author: Ulrich Vogt
Author: Thomas Graule
Author: Philipp Thurner
Author: Felix Beckmann
Author: Bert Müller

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