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

Wood-derived porous ceramics via infiltration of SiO2-Sol and carbothermal reduction
Wood-derived porous ceramics via infiltration of SiO2-Sol and carbothermal reduction
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.
0018-3830
440-446
Klingner, Raoul
c0a09e8e-1bc7-4e99-88b0-103c81088abd
Sell, Juergen
c1057ef1-db94-4ad5-b181-64966f84b36e
Zimmermann, Tanja
ce773ec8-e20f-4c1b-9c08-ab308419246a
Herzog, Andreas
d8b90e54-8bbd-4136-a54f-015cda7ded2b
Vogt, Ulrich
8bc7d1f8-c5f8-4f19-b537-2aca2e821378
Graule, Thomas
33465aab-afc6-4455-b62f-4ccea4613373
Thurner, Philipp
ab711ddd-784e-48de-aaad-f56aec40f84f
Beckmann, Felix
9c0d47e5-e36b-4523-b6b6-0d65a708441b
Müller, Bert
acba4294-b684-4a09-81ac-32de31d39923
Klingner, Raoul
c0a09e8e-1bc7-4e99-88b0-103c81088abd
Sell, Juergen
c1057ef1-db94-4ad5-b181-64966f84b36e
Zimmermann, Tanja
ce773ec8-e20f-4c1b-9c08-ab308419246a
Herzog, Andreas
d8b90e54-8bbd-4136-a54f-015cda7ded2b
Vogt, Ulrich
8bc7d1f8-c5f8-4f19-b537-2aca2e821378
Graule, Thomas
33465aab-afc6-4455-b62f-4ccea4613373
Thurner, Philipp
ab711ddd-784e-48de-aaad-f56aec40f84f
Beckmann, Felix
9c0d47e5-e36b-4523-b6b6-0d65a708441b
Müller, Bert
acba4294-b684-4a09-81ac-32de31d39923

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), 440-446. (doi:10.1515/HF.2003.065).

Record type: Article

Abstract

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

Identifiers

Local EPrints ID: 48953
URI: http://eprints.soton.ac.uk/id/eprint/48953
ISSN: 0018-3830
PURE UUID: 33777929-ebd3-4dce-9967-94e1bdf77fb6
ORCID for Philipp Thurner: ORCID iD orcid.org/0000-0001-7588-9041

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Date deposited: 18 Oct 2007
Last modified: 15 Mar 2024 09:51

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Contributors

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

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