인산칼슘계 세라믹스 분말의 합성과 in vitro에서의 용해특성

Abstract

of higher solubility of β-TCP than HA. In case of the BCP powders, the surface of particles became rough with increasing the immersion time. It is considered that unstable surface formed resulting in the stress concentration and formation of dislocation on surface of particles by milling. This surface dissolution gradually extended into the core region of the particles resulting in disintegration of the spherical particles into fine crystal. Commercial hydroxyapatite powders were calcined at the temperature range of 1000-1350℃ in air and the calcined powders were immersed both in distilled water and SBF of pH 7.4 at 37℃ for 3 or 7 days. As the calcination temperature increases, HA gradually released OH­ ions and partially transformed to OHAP at 1200℃, followed by that the OHAP was decomposed into TTCP and α-TCP above 1350℃. These non-stoichiometric chemical composition accelerated the surface dissolution of HA powders, followed by that the dissolution was extended inwards the particles resulting in the formation of needle-like particles.