การสังเคราะห์และวิเคราะห์วัสดุชีวภาพนาโนเกรนที่มีไฮดรอกซี อะพาไทต์เป็นองค์ประกอบหลัก

Abstract

Characterization of hydroxyapatite (HA) nanopowder that prepared from cattle bone was carried out by X-ray diffraction (XRD). Chemical analysis was done using an Energy dispersive X-ray spectrophotometry (EDS). The XRD patterns of hydroxyapatite powder correspond to that of pure hydroxyapatite phase (JCPDS File No.9432). The result of the chemical analysis determined the Ca/P molar ratio; it was 1.66. Improvements of the mechanical properties of hydroxyapatite ceramics were achieved by rate-controlled sintering (RCS) method. The green compacted pellets of all HA powders were subsequently sintered at 1150C 1200C 1250C and1300C for 3 hours, respectively, by rate-controlled sintering (RCS) compared to conventional sintering method. The physical and mechanical characterizations as well as microstructural evaluation have been performed in order to determine the optimum sintering conditions. Finally, the best of mechanical properties of hydroxyapatite ceramics were: average flexural bending strength 288 ± 4.6 MPa and average fracture toughness (K1C) 5.6 ± 0.1 MPa.m1/2 for a material sintered at 1200C.by rate-controlled sintering (RCS) method.