RESEARCH ON THE PRODUCTION OF POROUS HYDROXYAPATITE CERAMICS FROM COCKLE SHELLS OF LANG CO, THUA THIEN-HUE PROVINCE

Tóm tắt

The study dealed with the process of producing hydroxylapatite (HA) powder and porous hydroxylapatite ceramics. The raw materials, cockle shells from Lang Co (Thua Thien-Hue Province) were thermally decomposed into CaO and then the obtained CaO reacted hydrothermally with a (NH4)2HPO4 solution. The hydrothermal process was carried out in a autoclave equipment at 180-220oC. Some characteristics of the obtained hydroxyapatite powder as phase content, bonding, particle shape and size were determined by X-ray Diffraction (XRD), Infrared Spectrometry (FT-IR) and Scanning Electron Microscopy (SEM). The results showed that the reaction temperature did not affect the phase content but HA crystalline shapes and sizes. The study also dealed with the impact of slurry water content and firing temperature on the HA ceramics properties. As the result, the porous HA ceramics having good compressive strength (261 MPa) was obtained, and it had the slurry water content of 35% and the firing temperature of 1250oC.