Abstract:

To solve the reunion problem of nano hydroxyapatite(HA) powders, the HA was prepared with the aid of ultrasonic wave and heated in 900℃, using Ca(NO3)2·4H2O and(NH4)2HPO4 as raw materials.The phase composition, chemical composition, micromorphology, thermal stability of the obtained HA were respectively studied by XRD, SEM, FTIR and TG-DTA. The results indicated that the micromorphology of synthesized HA with a mean size of 50nm was an isometric crystal and its uniformity and dispersity was good. The ultrasonic wave treatment of nano-scale powders could solve the reunion problem to a certain extent, and  heat-treatment could improve the crystallinity of HA grains.
 

Key words: nano-hydroxyapatite, ultrasonic wave, heat treatment