Journal article

Microcellular Al2O3 ceramics from wood for filter applications

Publication Details
Author(s): Rambo CR, Andrade T, Fey T, Sieber H, Martinelli AE, Greil P
Publisher: Wiley-Blackwell
Publication year: 2008
Volume: 91
Pages range: 852-859
ISSN: 0002-7820


Microcellular biomorphous Al2O3 was produced by Al-vapor infiltration in pyrolyzed rattan and pine wood-derived biocarbon preforms. At 1600 degrees C the biocarbon preforms reacted with gaseous aluminum to form Al4C3. After oxidation in air at temperatures between 1550 degrees and 1650 degrees C, for 3 h, the biocarbon preforms were fully converted into alpha-Al2O3. Owing to the high anisotropy of biomorphous Al2O3, the compressive strength behavior was strongly dependent on the loading direction. The compressive strength of the specimens (0.1-11 MPa) is strongly dependent on their overall porosity and their behavior could be explained using the Gibson-Ashby model. The Darcian permeability (k(1)), as well as the non-Darcian permeability (k(2)), increased with an increase of the total porosity. The Darcian permeability of biomorphous Al2O3 was found to be in the range of 1-8 x 10(-9) m(2), which is in the order of magnitude of gas filters, and, therefore, suitable for several technological applications.

How to cite
APA: Rambo, C.R., Andrade, T., Fey, T., Sieber, H., Martinelli, A.E., & Greil, P. (2008). Microcellular Al2O3 ceramics from wood for filter applications. Journal of the American Ceramic Society, 91, 852-859.

MLA: Rambo, Carlos Renato, et al. "Microcellular Al2O3 ceramics from wood for filter applications." Journal of the American Ceramic Society 91 (2008): 852-859.

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