Abstract
The thermal evolution of glass fibres of the SiO2-Li2O-TiO2-Al2O3 system has been investigated by X-ray diffraction, DTA and SEM. Within the range of the compositions investigated (2 to 10 mol % TiO2) SEM and SAXS measurements on bulk materials have shown that a small addition of Al2O3 (3 mol %) does not modify the limits of the immiscibility region present in the ternary system SiO2-LiO2-TiO2. Within this region TiO2-rich droplets are more than likely to be formed. As to tensile strength, the “asquenched” fibres of the composition placed within the immiscibility dome give higher values than that obtained outside the liquid-liquid region and these values are higher than those measured on E-glass fibres. A slight crystallization in all the fibres leads to a continuous decrease of the initial tensile strength. With regards to the crystal phases presented by the crystallized fibres, the first exothermic peak is due to the simultaneous crystallization ofβ-quartz (ss) and lithium disilicate whereas the second peak is due, most probably, to aβ-quartz (ss) →β-spodumene (ss) phase transformation as well as to the formation of Li2TiSiO5. The path of crystallization of the other detected Ti-compounds is similar to that proposed by Furukawa and White.
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