Abstract
Phase separation, nucleation, crystallization and micro-crack extension and their affects on the tensile strength and alkaline resistance of TiO2 nucleating Li2O-Al2O3-B2O3-ZnO-SiO2 system glass-ceramic fibres are studied by DTA, XRD, TEM and SEM. Phase separation, temperature range of nucleation, Tg, sequence and kinetics of crystallization, sizes of microstructure and surface microcracks, tensile strength and weight loss of alkali corrosion of glass-ceramic fibres are also studied. The mechanism of crystallization and the process of microcrack extension during the preparation of glass-ceramic fibres are discussed in detail. The glass prepared for glass-ceramic fibres should be characterized by the temperature of phase separation, nucleation and crystallization of the glass ought to be low, as near Tg as possible, corresponding to its basic properties and the rate of dense bulk crystallization must be closely controlled. The microstructure of small and concentrated crystallites, about, 25 nm in size while the diameter of the glass-ceramic fibres is 16 μm, produced in the glass-ceramic fibres increases its tensile strength and alkaline resistance. A suitable coupling agent covering the surface of the glass-ceramic fibres and tensile stress exerted on them during heat treatment benefit its mechanical and chemical properties.
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