Mechanical properties and microstructure of biomorphic silicon carbide ceramics fabricated from wood precursors |
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| Affiliation: | 1. QSS Group, Inc., NASA Glenn Research Center, Cleveland, OH 44135, USA;2. Structures Division, NASA Glenn Research Center, Cleveland, OH 44135, USA;1. Institute of Technology and Mechatronics, University of Silesia, 12 ?ytnia St, 41-200 Sosnowiec, Poland;2. EMPA, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for High Performance Ceramics, 8600 Duebendorf, Switzerland;3. Insitute of Physics, University of Silesia, 40-007 Katowice, 4 Uniwersytecka St, Poland;1. Spectroscopy Dep., National Research Centre, 33 EL Bohouth st. (former EL Tahrir st.), Dokki, P.O. 12622, Giza, Egypt;2. Microwave Physics and Dielectrics Dep., National Research Centre, 33 EL Bohouth st. (former EL Tahrir st.), Dokki, P.O. 12622, Giza, Egypt;1. Department of Mechanical and Material Engineering, Vilnius Gediminas Technical University, J. Basanavi?iaus St. 28, Vilnius 03224, Lithuania;2. Institute of Industrial Electronics and Electrical Engineering, Riga Technical University, Kalku St1, Riga 1658, Latvia;3. Institute of Mechanical Science, Vilnius Gediminas Technical University, J. Basanavi?iaus St. 28, Vilnius 03224, Lithuania;4. Department of Applied Mechanics, Vilnius Gediminas Technical University, Saul?tekio av. 11, Vilnius 10223, Lithuania |
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| Abstract: | Silicon carbide-based, environment friendly, biomorphic ceramics have been fabricated by the pyrolysis and infiltration of natural wood (maple and mahogany) precursors. This technology provides an eco-friendly route to advanced ceramic materials. These biomorphic silicon carbide ceramics have tailorable properties and behave like silicon carbide based materials manufactured by conventional approaches. The elastic moduli and fracture toughness of biomorphic ceramics strongly depend on the properties of starting wood preforms and the degree of molten silicon infiltration. Mechanical properties of silicon carbide ceramics fabricated from maple wood precursors indicate flexural strengths of 344±58 MPa at room temperature and 230±36 MPa at 1350 °C. Room temperature fracture toughness of the maple based material is 2.6±0.2 MPa√m while the mahogany precursor derived ceramics show a fracture toughness of 2.0±0.2 MPa√m. The fracture toughness and the strength increase as the density of final material increases. Fractographic characterization indicates the failure origins to be pores and chipped pockets of silicon. |
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