多孔CaO-P_2O_5-SiO_2系生物陶瓷的原位合成

In-situ Synthesis of the Porous CaO-P_2O_5-SiO_2 System Bioceramic

本文采用原位合成技术制备了多孔CaO P2 O5 SiO2 系生物陶瓷。研究表明 :2 4 0°C水热合成 8h、10 2 0°C下烧结 2h ,主晶相为 β TCP ,次晶相为HA ,此外 ,尚含有SiO2 ;并有 1.3～ 1.7mm大孔 ,在大孔内表面有大量的 0 .6～ 2 .8μ微孔 ,在大孔孔壁内部有大量的 1.0～ 3.0 μ微孔 ,从而形成大孔通过 0 .6～ 3.0 μ微孔相互贯通的三维网络状孔结构。二次水热处理工艺后 ,多孔生物陶瓷中的颗粒状 β TCP向针状缺钙型HA转变。

The porous CaO-P 2O 5-SiO 2 system bioceramics were prepared by in-situ synthesis technique. The results showed that phases of the sample consist of β-TCP as main-crystal-phase,hydroxyapatite as secondary crystal-phase and silicon dioxide by the way of both processed at 240 °C hydrothermal condition for 8h and sintered at 1020 °C for 2h. The sample possesses macropores with size from 1.3 to 1.7 mm. Inner surface of the macropores has many micropores with size from 0.6 to 2.8 micron, inside of the macropore-wall has many micropores with size from 1.0 to 3.0 micron, so macropores form net-pore-structure passages one another by micropores with size from 0.6 to 3.0 micron. Further hydrothermal process induces that the sample undergoes a phase-change from grain-like β-TCP to needle-like calcium-deficient hydroxyapatite.