Abstract
A high strength glass-ceramic of the system MgO-TiO2-P2O5-Al2O3-SiO2 was modified on the surface, by an ion exchange with an eutectic salt melt (CaCl2/CaF2) or a modified salt melt (CaCl2/CaF2/Ca(PO3)2) of the base glass. The surfaces of the samples were investigated by means of optical and scanning electron microscopy, X-ray diffraction as well as IR spectroscopy. The formation of apatite crystals of different shape was observed in the surface layer of ion exchanged and subsequent thermal treated glass-ceramics.
