Porous hydroxyapatite ceramics by ice templating: Freezing characteristics and mechanical properties

Porous hydroxyapatite ceramics by ice templating: Freezing characteristics and mechanical properties
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冰模板法制备多孔羟基磷灰石陶瓷:冷冻特性和机械性能

DOI:
10.1016/j.ceramint.2010.10.003
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发表时间:
2011-03
影响因子:
5.2
通讯作者:
Tang, Yu-Fei
Tang, Yu-Fei
中科院分区:
材料科学1区
文献类型:
--
作者:
Qin, Ying-Su;Zhao, Kang;Wei, Jun-Qi;Tang, Yu-Fei

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当使用水性 HA 浆料时,冰模板可产生具有层状形态和对齐通道的多孔羟基磷灰石 (HA) 支架。我们根据多孔 HA 支架的孔结构研究了 HA 浆料的冷冻特性。我们发现通过增加冷却速率,层间距减小。冷却速率为1.3℃/min时,平均片层间距约为785.7μm。随着初始成核温度的降低和过冷程度的增加,多孔几何形状从片层和排列良好的通道变为部分枝晶和部分排列的空腔。此外,我们还确定了抗压强度和孔隙率之间的关系。多孔HA支架在孔隙率为64%时抗压强度达到6.7MPa,片层间距约为124μm。
Ice templating produces porous hydroxyapatite (HA) scaffolds with a lamellar morphology and aligned channels when using aqueous HA slurries. We investigated the freezing characteristics of HA slurries with regard to the pore structures of the porous HA scaffolds. We found that by increasing the cooling rate, the lamellar spacing decreased. The average lamellar spacing is about 785.7μm at a cooling rate of 1.3°C/min. The porous geometry changes from lamella and well aligned channels to a partial dendrite and partially aligned cavities with a decrease in the initial nucleation temperature and an increase in the degree of supercooling. Additionally, we determined the relationship between compressive strength and porosity. The compressive strength of the porous HA scaffolds reach 6.7MPa at a porosity of 64% and the lamellar spacing is about 124μm.
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