Microstructural dependence of Young's and shear moduli of P2O5 glass reinforced hydroxyapatite for biomedical applications
Microstructural dependence of Young's and shear moduli of P2O5 glass reinforced hydroxyapatite for biomedical applications
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DOI：
10.1016/s0142-9612(99)00248-3
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发表时间：
2000-04-01
期刊：
影响因子：
14
通讯作者：
Santos, JD
中科院分区：
文献类型：
--
作者：
Lopes, MA;Silva, RF;Santos, JD
采用液相烧结法制备了P2 O 5玻璃增强羟基磷灰石复合材料。第二相，β-和α-磷酸三钙（β-TCP和α-TCP），形成在复合材料的微观结构中，由于液体玻璃相和羟基磷灰石基体之间的反应。采用脉冲激励法测定了复合材料的动态杨氏模量（E）和剪切模量（G）。通过应用Duckle-Knudsen方程，弹性性能结果与β-TCP和α-TCP相的相对比例以及微观结构中存在的孔隙率百分比相关。玻璃增强羟基磷灰石复合材料表现出较低的杨氏模量和剪切模量比未改性的羟基磷灰石，主要是由于β-TCP相的存在。Duckwell-Knudsen模型证明了E和G模量与孔隙率的指数依赖关系，并导出了孔隙率校正因子（B）分别为4.04和4.11的复合材料的数学方程，表明孔隙率大大降低了E和G模量。(C)2000爱思唯尔科技有限公司版权所有。
P2O5 glass reinforced hydroxyapatite composite materials were prepared through a liquid-phase sintering process. Secondary phases, beta- and alpha-tricalcium phosphates (beta-TCP and alpha-TCP), were formed in the microstructure of the composites, due to the reaction between the liquid glassy phase and the hydroxyapatite matrix. The dynamic Young's modulus (E) and shear modulus (G) of these composites were determined using an impulse excitation method. By applying the Duckworth-Knudsen equation, the elastic property results were correlated with the relative proportion of beta-TCP and alpha-TCP phases and with the porosity percentage present in the microstructure. Glass reinforced hydroxyapatite composites showed lower Young's and shear moduli than unmodified hydroxyapatite, mainly due to the presence of beta-TCP phase. The Duckworth-Knudsen model demonstrated an exponential dependence of E and G modulus with porosity and mathematical equations were derived for composite materials with porosity correction factors (b) of 4.04 and 4.11, respectively, indicating that porosity largely decreased both E and G moduli. (C) 2000 Elsevier Science Ltd. All rights reserved.