Hydroxyapatite synthesized by a simplified hydrothermal method

摘要

A simplified hydrothermal method of synthesizing hydroxyapatite powder is described. Heating powders of Ca(OH)_2, Ca(H)_2PO_4)_2.H_2O and distilled water in a pressurized pot at 109 deg.C for 1-3 h results in powders consisting of crystallized hydroxyapatite in a needle shape, 130-170 nm in length and 15-25 nm in width. The specific surface area is 31-43 m~2/g and the Ca/P ratio is 1.640-1.643. the obtained HA powder can be sintered to a high density at 1200- 1300 deg.C. No decomposition was identified by X-ray diffraction. The optimally sintered ceramic has a pore-free surface structure with a flexural strength of 120 Mpa, a micro-Vickers hardness of 5.1 Gpa and fracture toughness of 1.2Mpa.m~/2.