Ceramics-Silikáty 51 (4) 190-197 (2007)

Microstructure and mechanical properties of heat resistant composites reinforced with basalt fibres

P. Glogar, Z. Sucharda, M. Černý, S. Puchegger, H. Peterlik

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.

Keywords: Ceramic matrix composites, Thermosetting resin, Basalt fibre, Mechanical testing, High temperature behavior