扫描电镜观察显示胫骨是一种由羟基磷灰石和胶原蛋白组成的自然生物陶瓷复合材料.羟基磷灰石具有层状的微结构并且平行于骨的表面排列.观察也显示这些羟基磷灰石层又是由许多羟基磷灰石片所组成,这些羟基磷灰石片具有长而薄的形状,也以平行的方式整齐排列.基于在胫骨中观察到的羟基磷灰石片的微结构特征,通过微结构模型分析及实验,研究了羟基磷灰石片平行排列微结构的最大拔出能.结果表明,羟基磷灰石片长而薄的形状以及平行排列方式增加了其最大拔出能,进而提高了骨的断裂韧性.
The observation of Scanning Electronic Microscope (SEM) on a shankbone shows that the bone is a kind of natural bioceramic composite consisting of hydroxyapatite and collagen protein. The hydroxyapatite is of laminated microstructure and distributed parallel to the surface of the bone. The observation also shows that the hydroxyapatite layers are further composed of many hydroxyapatite sheets. The hydroxyapatite sheets possess long and thin shape as well as parallel distribution. The maximal pullout energy of the parallel microstructure of the hydroxyapatite sheets were investigated with its representative model and a pullout-energy experiment. The results show that the long and thin shape as well as the parallel distribution of the hydroxyapatite sheets increase the maximal pullout energy of the sheets and enhance the fracture toughness of the bone.
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