Ceramics-Silikáty 51, (4) 190 - 197 (2007) |
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MICROSTRUCTURE AND MECHANICAL PROPERTIES OF HEAT RESISTANT COMPOSITES REINFORCED WITH BASALT FIBRES |
Glogar Petr 1, Sucharda Zbyněk 1, Černý Martin 1,
Puchegger Stephan 2,
Peterlik Herwig 2 |
1 Institute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic,
V Holešovičkách 41, 182 09 Prague, Czech Republic
2 Institute of Materials Physics, University of Vienna,
Boltzmanngasse 5, A-1090 Vienna, Austria
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Keywords: Ceramic matrix composites, Thermosetting resin, Basalt fibre, Mechanical testing, High temperature behavior |
Microstructure, oxidation resistance and mechanical properties of unidirectional composites made of commercially available
polysiloxane resins as matrix precursors and reinforced with continuous basalt fibres were investigated. After pyrolysis of the
precursing polymer matrix composites to 600-800°C the matrix was gradually transformed to a ceramic one, which revealed
low mass losses when oxidised in hot air. When subjected to a long time heat treatment in air at 700 and 800°C numerous
matrix cracks emerged and plastic deformation of fibres occurred. Despite this damage of the microstructure, the elastic and
shear moduli increased significantly. The increase should be attributed to structural changes of the polymer matrix transforming
to a ceramic material, which prevail in their implications over the deteriorating effect of matrix cracking. |
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