High Strength SiSiC Ceramics Derived from Fine Wood Powders
Hofenauer, A. and Treusch, O. and Tröger, F. and Gahr, M. and Schmidt, J. and Wegener, G. and Krenkel, W. and Fromm, J. (2004) High Strength SiSiC Ceramics Derived from Fine Wood Powders. 28 th International Cocoa Beach Conference and Exposition on Advanced Ceramics & Composites, Cocoa Beach, Florida, USA, 25-30.01.2004.
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A new approach to the manufacture of dense reaction infiltrated silicon carbide (SiSiC) from wood-based composites is presented in a joint project by the German Aerospace Centre (DLR) and the Technical University of Munich (TUM). To produce such ceramics, wood powders of small particle sizes were homogeneously mixed with phenolic resin powder and made into boards (140x140x10 mm³) in an uni-axial thermal pressing process. By varying parameters such as wood species, particle size, amount of binding agent as well as pressure and temperature during the pressing process a wide range of structural modifications in wood composites is possible. These materials were carbonized at temperatures up to 1650 °C to obtain porous carbon pre-forms for the final reaction infiltration with liquid silicon. One advantage of this process is the use of cheap raw materials such as wood and phenolic resin powder. Moreover, in contrast to natural solid wood, the isotropy of these wood-based ceramics is much higher and the properties are easily adjustable and reproducible. The micro-structure, phase composition and mechanical properties of these ceramics were investigated. Densities of up to 3070 kg/m³ with SiC contents in the range of 70-85 vol.-%. and flexural strength values up to 400 MPa were achieved.
|Document Type:||Conference or Workshop Item (Speech)|
|Title:||High Strength SiSiC Ceramics Derived from Fine Wood Powders|
|Keywords:||CMC, composites, ceramic, biomorphic, wood, manufacture, properties|
|Event Title:||28 th International Cocoa Beach Conference and Exposition on Advanced Ceramics & Composites, Cocoa Beach, Florida, USA, 25-30.01.2004|
|Organizer:||The American Ceramic Society|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W RP - Raumtransport|
|DLR - Research area:||Space|
|DLR - Program:||W RP - Raumtransport|
|DLR - Research theme (Project):||UNSPECIFIED|
|Institutes and Institutions:||Institute of Structures and Design|
|Deposited By:||elib DLR-Beauftragter|
|Deposited On:||16 Sep 2005|
|Last Modified:||14 Jan 2010 13:24|
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