تحولات فازی و رفتار حرارتی ترکیب پیروفسفات کلسیم حاصل از سنتز حرارتی پودرهای هیدروکسی آپاتیت و شیشه های فسفاتی

The aim of this work was to investigate the phase transformations and the sinterability of calcium pyrophosphate (CPP), prepared from a mixture of hydroxyapatite (HA) and phosphate glass. Phase and micro-structural evaluation of the sintered samples as well as physical, chemical and thermal characterization of the starting materials were performed, using inductively coupled plasma (ICP), X-ray diffraction, scanning electron microscopy (SEM), particle size measurement, simultaneous thermal analysis (STA) and density measurement. The bodies, sintered at low temperature (1000 - 1100 ºC), generated the β-CPP and α-CPP compounds, whereas at high temperature (1200 - 1250 ºC) the α-CPP phase was often identified. The reaction of the calcium methaphosphate and the HA particles appeared to be continuous and finished before the calcium methaphosphate melting.