PREPARATION AND CHARACTERIZATION OF FREE FLOWING HYDROXY APATITE POWDERS

Abstract

Free flowing hydroxy apatite (HAP) powders have been synthesized by precipitation followed by freeze drying and spray drying techniques. The spray dried HAP powder (5-25 microns spheres) showed improved sintering characteristics compared to freeze dried powders, which were irregular in shape and their agglomerate sizes were in the range 5-100 microns. It also found that surface impurities on the freshly prepared powders show toxicity effects towards Red Cells, and L.929 fibroblast cells.