Study on Crystallization of Calcium Metaphosphate Glass-ceramics

Ca(PO3)2 glass with molar ration of Ca/P=0.45 were prepared by hardening the mixture of Ca(H2PO4)2·H2O and H3PO4 melt.Calcium metaphosphate glass-ceramics have been obtained after reheated the glass at 300-700 ℃.The structure change and morphology of glass-ceramics were examined by means of XRD,FT-IR spectroscopy and SEM.The results show that the crystal phase in glass is pure β-Ca(PO3)2;crystallization can occur and transform during the reheating process gradually;β-Ca(PO3)2 has been obtained when heated at 400 ℃ for 3 h;The fine structure in IR spectrum is more evidence at high temperature than low;the shape of crystal phase change to tightness cosh shape grain with clear boundary from fibre when the temperature increased and heat time prolonged.