Ceramics-Silikáty 51 (2) 82-88 (2007)

COMPARISON OF MECHANICAL PROPERTIES AND STRUCTURAL CHANGES OF CONTINUOUS BASALT AND GLASS FIBRES AT ELEVATED TEMPERATURES

M. Černý, P. Glogar, V. Goliáš, J. Hruška, P. Jakeš, Z. Sucharda, I. Vávrová

The investigated commercially available continuous basalt fibres fall short of selected glass fibres in their elastic and plastic response to tensile load at elevated temperatures. The onset temperature of unlimited elongation equals approximately 580 and 640, or 840 and 700° C for the basalt or glass fibres, respectively. The best (R-glass) fibre retains its modulus up to 450°C and loses but 8 % of its room-temperature value at 600°C, while the basalt fibres reveal significant losses of modulus (10-13 %) even at 450°C. Behaviour of the basalt fibres may be affected by onset of crystallization, which was detected by X-ray diffraction after heat treatment to 750°C.

Keywords: basalt fibre, glass fibre, tensile properties, elevated temperature, crystallization, X-ray diffraction.